阅读说明：本技术 一种基于光照的集装箱箱体入侵检测系统及方法 (Container body intrusion detection system and method based on illumination ) 是由 吕瑛 贺占庄 唐雪寒 吕明畅 于 2020-03-26 设计创作，主要内容包括：本发明属于集装箱箱体入侵检测领域,公开了一种基于光照的集装箱箱体入侵检测系统及方法,包括以下步骤：采集第一照度检测点的集装箱箱体光照强度并得到集装箱的箱门状态,其中,第一照度检测点位于集装箱箱门内侧顶部,当集装箱箱体光照强度大于预设的比较基准时,箱门状态为开启；否则,箱门状态为关闭；重复上述步骤,将当前记录的箱门状态与上一次记录的箱门状态对比,当两次箱门状态不一致时,生成箱门状态报警信号。根据采集到的集装箱箱体光照强度,实现高效、可靠、可信的箱体入侵检测,可自动判别箱门开关状态,为集装箱箱门开光状态的监控提供手段,有效克服集现有装箱箱门检测装置无法真实反映集装箱箱门的开关状态的缺陷。(The invention belongs to the field of container body intrusion detection, and discloses a container body intrusion detection system and method based on illumination, which comprises the following steps: acquiring the illumination intensity of the container body of a first illumination detection point and obtaining the state of a container door of the container, wherein the first illumination detection point is positioned at the top of the inner side of the container door, and when the illumination intensity of the container body is greater than a preset comparison reference, the container door is opened; otherwise, the door is closed; and repeating the steps, comparing the current recorded box door state with the last recorded box door state, and generating a box door state alarm signal when the two box door states are inconsistent. According to the collected illumination intensity of the container body, the high-efficiency, reliable and credible intrusion detection of the container body is realized, the opening and closing states of the container door can be automatically judged, a means is provided for monitoring the opening and closing states of the container door, and the defect that the existing container door detection device cannot truly reflect the opening and closing states of the container door is effectively overcome.)

1. A container body intrusion detection method based on illumination is characterized by comprising the following steps:

s1: acquiring the illumination intensity of the container body of a first illumination detection point and obtaining the state of a container door of the container, wherein the first illumination detection point is positioned at the top of the inner side of the container door, and when the illumination intensity of the container body is greater than a preset comparison reference, the container door is opened; otherwise, the door is closed;

s2: and repeating S1, comparing the current recorded door state with the last recorded door state, and generating a door state alarm signal when the two door states are inconsistent.

2. The illumination-based intrusion detection method for the container body according to claim 1, wherein the specific method for collecting the illumination intensity of the container body at the first preset illumination detection point in the container body in S1 is as follows:

acquiring container body illumination intensity samples of a first preset illumination detection point in the container body at a speed of 10Hz, and calculating an average value of the container body illumination intensity samples acquired every second to obtain the container body illumination intensity of the first preset illumination detection point.

3. The illumination-based intrusion detection method for the container body according to claim 1, wherein the specific method of S2 is as follows:

repeating S1, comparing the current recorded door state with the last recorded door state, and generating a door state alarm signal when the two door states are inconsistent; when the current recorded door state is open and the last recorded door state is closed, a door state alarm signal indicating that the door is open is generated; and when the current recorded door state is closed and the last recorded door state is opened, generating a door state alarm signal that the door is closed.

4. The illumination-based intrusion detection method for a container body according to claim 1, further comprising the steps of:

s3: collecting the illumination intensity of the container body from a second illumination detection point to an Nth illumination detection point in the container body, wherein the second illumination detection point to the Nth illumination detection point are all positioned on the top side in the container body and are distributed at intervals along the direction from the container door to the container tail;

s4: and obtaining the position of the container body invasion according to the illumination intensity of the container body from the second illumination detection point to the Nth illumination detection point.

5. The illumination-based intrusion detection method for the container body according to claim 1, wherein the specific method of S4 is as follows:

and selecting a maximum value from the illumination intensity of the container body from the second illumination detection point to the Nth illumination detection point, wherein the illumination detection point position corresponding to the maximum value is the position where the container body invades.

6. The illumination-based intrusion detection method for a container body according to claim 4, further comprising the steps of:

s5: acquiring the illumination intensity of the container body of a first illumination detection point when the door is opened, and obtaining a comparison reference of each illumination detection point according to the following formula:

Br_n＝Ec₁-(L₁L₂L₃…L_n)*M

wherein, Br_nA comparison reference Ec representing the nth illuminance detection point₁L indicating the intensity of illumination of the container body at the first illumination detection point_nThe distance between the nth illumination detection point and the first illumination detection point is represented, and M represents the illumination intensity which is reduced per meter along the illumination direction;

and calculating the difference value between the illumination intensity of the container body of each illumination detection point and a comparison reference, respectively drawing an illumination curve and a reference illumination curve on a two-dimensional plane by taking the illumination detection point number as an X-axis coordinate and taking the illumination intensity of the container body and the comparison reference as a Y-axis coordinate, and displaying the difference value between the illumination intensity of the container body and the comparison reference in a single-point mode to obtain a two-dimensional fitting curve graph of the illumination intensity of the container body.

7. The illumination-based intrusion detection method for a container body according to claim 6, wherein the S5 further includes a self-calibration step, specifically:

and when the door state is opened, the illumination intensity of the container body of each illumination detection point is obtained as a calibration comparison reference of each illumination detection point, and when the error between the comparison reference of each illumination detection point and the calibration comparison reference is within +/-10L x, the container body state is normal.

8. An intrusion detection system for container body based on illumination, comprising a memory, a processor, a computer program stored in the memory and capable of running on the processor and a first illumination detection module, wherein the first illumination detection module is arranged on a first illumination detection point to an Nth illumination detection point and connected with the processor, the first illumination detection point is positioned at the top of the inner side of the container door, the processor implements the steps of the intrusion detection method for container body based on illumination according to any one of claims 1 to 3 when executing the computer program.

9. The illumination-based intrusion detection system for a container body according to claim 8, further comprising second through nth illumination detection modules respectively disposed at second through nth illumination detection points and connected to the processor, the second through nth illumination detection points being located at the top side of the interior of the container body and spaced apart from each other in the direction from the door to the tail of the container body; the processor when executing the computer program performs the steps of the illumination based intrusion detection method for a container body according to any one of claims 4 to 7.

10. The illumination-based intrusion detection system for a container body according to claim 8 wherein the first illumination detection module is an illumination intensity sensor.

Technical Field

The invention belongs to the field of container body intrusion detection, and relates to a container body intrusion detection system and method based on illumination.

Background

With the continuous improvement of logistics service concept, in order to fully meet the needs of customers, international logistics transportation service providers convert the traditional "port-port" service into a "gate-gate" logistics transportation service, and the transportation mode is generated, namely international multimodal transportation, and has strong vitality and needs. International intermodal transportation involves the conversion between different modes of transportation, and containers are often used as transportation units to improve loading and unloading efficiency. In international multimodal transport, numerous participants cross different national boundaries, and once problems such as loss of goods, poor goods, loss of goods and the like occur, disputes are easy to occur. In order to protect the development of the multi-modal intermodal transportation in the country, most countries are inclined to the multi-modal intermodal operators in the aspect of relevant policies, so that the difficulty in dispute handling is further increased. The main reason for this problem is the lack of means for monitoring the container status during intermodal transportation, the most important of which is the container door opening and closing status.

The traditional container door detection device is hung outside a container door lock buckle in the forms of an electronic lock, an electronic tag, an electronic seal and the like, and plays a detection role in sealing a door and recording the state of the container door. Firstly, the device is externally hung outside a container body, does not belong to one part of the container body, does not conform to the international transportation standard of the container, and customs of all countries have different regulations on electronic equipment installed outside the container body, so that the externally hung equipment cannot be used abroad; secondly, the method can only detect the opening and closing state of the device, cannot truly reflect the opening and closing state of the door of the container, and cannot detect the intrusion state of the container body after the container body is violently disassembled; and such devices are easily removed by manual violence, in which case they cannot be used to detect the condition of the door. Currently, the monitoring of the doors of a container can be found in patents such as: the intelligent electronic lock based on the big dipper disclosed by CN201720618620 and the electronic lock head of the container disclosed by CN201830483007 and the like. Similar patents all use the way of electronic locks of containers to realize the control of the opening and closing of container doors and the detection of the opening and closing states of container doors.

Disclosure of Invention

The invention aims to overcome the defects that the container door detection device in the prior art cannot truly reflect the opening and closing state of the container door and cannot detect the intrusion state of the container body after the container body is violently disassembled, and provides a container body intrusion detection system and method based on illumination.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

on one hand, the invention provides a container body intrusion detection method based on illumination, which comprises the following steps:

s1: acquiring the illumination intensity of the container body of a first illumination detection point and obtaining the state of a container door of the container, wherein the first illumination detection point is positioned at the top of the inner side of the container door, and when the illumination intensity of the container body is greater than a preset comparison reference, the container door is opened; otherwise, the door is closed;

s2: and repeating S1, comparing the current recorded door state with the last recorded door state, and generating a door state alarm signal when the two door states are inconsistent.

The container body intrusion detection method based on illumination of the invention is further improved in that:

the specific method for acquiring the illumination intensity of the container body at the first preset illumination detection point in the container body in the S1 includes:

acquiring container body illumination intensity samples of a first preset illumination detection point in the container body at a speed of 10Hz, and calculating an average value of the container body illumination intensity samples acquired every second to obtain the container body illumination intensity of the first preset illumination detection point.

The specific method of S2 is as follows:

repeating S1, comparing the current recorded door state with the last recorded door state, and generating a door state alarm signal when the two door states are inconsistent; when the current recorded door state is open and the last recorded door state is closed, a door state alarm signal indicating that the door is open is generated; and when the current recorded door state is closed and the last recorded door state is opened, generating a door state alarm signal that the door is closed.

Further comprising the steps of:

s3: collecting the illumination intensity of the container body from a second illumination detection point to an Nth illumination detection point in the container body, wherein the second illumination detection point to the Nth illumination detection point are all positioned on the top side in the container body and are distributed at intervals along the direction from the container door to the container tail;

s4: and obtaining the position of the container body invasion according to the illumination intensity of the container body from the second illumination detection point to the Nth illumination detection point.

The specific method of S4 is as follows:

and selecting a maximum value from the illumination intensity of the container body from the second illumination detection point to the Nth illumination detection point, wherein the illumination detection point position corresponding to the maximum value is the position where the container body invades.

Further comprising the steps of:

s5: acquiring the illumination intensity of the container body of a first illumination detection point when the door is opened, and obtaining a comparison reference of each illumination detection point according to the following formula:

Br_n＝Ec₁-(L₁L₂L₃…L_n)*M

wherein, Br_nA comparison reference Ec representing the nth illuminance detection point₁L indicating the intensity of illumination of the container body at the first illumination detection point_nThe distance between the nth illumination detection point and the first illumination detection point is represented, and M represents the illumination intensity which is reduced per meter along the illumination direction;

and calculating the difference value between the illumination intensity of the container body of each illumination detection point and a comparison reference, respectively drawing an illumination curve and a reference illumination curve on a two-dimensional plane by taking the illumination detection point number as an X-axis coordinate and taking the illumination intensity of the container body and the comparison reference as a Y-axis coordinate, and displaying the difference value between the illumination intensity of the container body and the comparison reference in a single-point mode to obtain a two-dimensional fitting curve graph of the illumination intensity of the container body.

The S5 further includes a self-calibration step, specifically:

and when the door state is opened, the illumination intensity of the container body of each illumination detection point is obtained as a calibration comparison reference of each illumination detection point, and when the error between the comparison reference of each illumination detection point and the calibration comparison reference is within +/-10L x, the container body state is normal.

In another aspect of the present invention, an illumination-based intrusion detection system for a container body includes a memory, a processor, a computer program stored in the memory and operable on the processor, and a first illumination detection module, the first illumination detection module is disposed on a first illumination detection point to an nth illumination detection point and connected to the processor, the first illumination detection point is located at the top of the inner side of a door of the container, and the processor implements the steps of the illumination-based intrusion detection method for the container body when executing the computer program.

The container body intrusion detection system based on illumination of the invention is further improved in that:

the second illumination detection module to the Nth illumination detection module are respectively arranged on a second illumination detection point to an Nth illumination detection point and are all connected with the processor, and the second illumination detection point to the Nth illumination detection point are all positioned on the top side in the container body and are distributed at intervals along the direction from the container door to the container tail; the processor when executing the computer program performs the steps of the illumination based intrusion detection method for a container body according to any one of claims 4 to 7.

The first illumination detection module is an illumination intensity sensor.

Compared with the prior art, the invention has the following beneficial effects:

the invention relates to a container body intrusion detection method based on illumination, which is characterized in that the illumination intensity of a container body is collected and compared with a preset comparison standard, and when the illumination intensity of the container body is greater than the preset comparison standard, a container door is opened; otherwise, the door is closed. Through the condition of detecting the inside illumination intensity of container box, directly obtain container chamber door state, the effectual inconvenient use that brings at the external detection device's of container mode of having solved now, can only detection device's own on-off state, the on-off state of unable real reflection container chamber door, more unable detect the container box after the container box violence is broken and tear the defect of the box invasion state open, high-efficient, reliable, credible box intrusion detection and invasion mode are distinguished, can automatic judgement chamber door on-off state, the box is broken and is torn the invasion etc. provide the means for the control of container chamber door on-off state.

Furthermore, the method of collecting a plurality of sample values to calculate the average value improves the collection precision, prevents the condition that the result is directly changed due to one-time mistaken collection, and improves the stability.

Furthermore, a plurality of illumination detection points are arranged, are all positioned on the top side in the container body and are distributed at intervals along the direction from the container door to the container tail; the position of the container body invasion can be accurately positioned through the illumination intensity of the container body from the second illumination detection point to the Nth illumination detection point.

Furthermore, a two-dimensional fitting curve graph of the illumination intensity of the container body is established on a two-dimensional plane through a comparison reference, the illumination intensity of the container body and the difference value between the illumination intensity of the container body and the comparison reference, and then the state of a door of the container and the invasion condition of the container body can be visually obtained.

Further, a self-calibration step is arranged, because the size of the interior of the container body of the container is standardized, after the illumination detection module is started for use convenience, the processor can use a built-in comparison reference Br, and under the condition that the container is empty and the container door is opened, each illumination detection point carries out illumination detection to obtain an illumination reference Br of N points_nAnd a comparison standard can be obtained more accurately.

The container body intrusion detection system based on illumination realizes the detection of the illumination intensity of the container body by arranging the illumination detection module, and realizes the container body intrusion detection method based on illumination by the processor.

Drawings

FIG. 1 is a block diagram of a single point detection process of an embodiment;

FIG. 2 is a schematic view of an installation position of a single illumination detection point according to an embodiment;

FIG. 3 is a schematic view of an installation position of multiple illuminance detection points according to an embodiment;

FIG. 4 is a diagram illustrating a comparative reference inside the cabinet when the door of the embodiment is opened;

FIG. 5 is a diagram illustrating a comparative reference for calibration inside the cabinet when the door of the embodiment is opened;

FIG. 6 is a two-dimensional fitting graph of the illuminance inside the cabinet when the door of the embodiment is closed;

FIG. 7 is a two-dimensional fitting graph of the illuminance inside the box body when the tail of the box body is broken and disassembled according to the embodiment;

FIG. 8 is a two-dimensional fitting graph of the illuminance inside the box body when the middle part of the box body is broken down according to the embodiment.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

First, some concepts to which the invention is designed are explained or defined.

The container body illumination intensity Ec refers to the reflected illumination intensity formed inside the container body by a light source entering the container body through one or more refractions, and Ec is equal to the utilization Coefficient (CU).

Definition II: comparison criterion Br: the container body for international multimodal transportation is a fully closed cube, one side door of the container body can be opened and closed, the container body is divided into two standard sizes of 20 feet and 40 feet, and the lengths of the inner walls of the container body are 5.898 meters and 12.032 meters respectively. The comparison standard Br of the container body illumination is as follows: the illumination value of each local space in the container body is a reference illumination value for judging the intrusion condition of the container body under the normal closing state and the opening state of the container door.

The comparison standard Br is 0L x when the container door is closed, the illumination intensity Ec of the container body starts from the container door and becomes a linear descending trend along with the increase of the door entering distance L when the container door is opened, and the descending index is M L x per meter, so that the change formula of each local illumination inside the container body along with the distance is as follows:

Br_n＝Ec-(L₁L₂L₃…L_n)*M。

defining three: and (3) invasion of the box body: according to the inside illuminance distribution condition of container box, divide into three kinds of situations with the container box invasion: the container door is closed, the container door is opened and the container body is broken and dismantled. The closing and opening of the container door are the correct door states of the container, and the validity of the door states of the container can be judged by combining the geographical position information of the container and the international multi-type intermodal transportation plan of the container. The container body is broken and torn down, which belongs to the abnormal state of the container body, and the broken and torn-down position of the container body can be judged by adopting a multi-point illumination detection mode.

Defining a multipoint illumination detection matrix D, wherein the multipoint illumination detection matrix D is an N × 1 matrix and is used for marking the actual illumination of N points in the container body, each point has a comparison reference Br, and the expression of the multipoint illumination detection matrix D is as follows:

D＝[(Ec₁,Br₁),(Ec₂,Br₂)…(Ec_n,Br_n)]。

the invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, the container body intrusion detection method based on illumination of the present invention is based on the illumination intensity data in the container body acquired by the illumination acquisition module, and utilizes a processor to process the data to obtain the container body intrusion condition, and includes two main detection modes, namely single-point illumination detection and multi-point illumination detection.

The single-point illuminance detection method is used for detecting the open/close state of the door, and includes the following steps for the single-point illuminance detection Br of 0L x.

The first step is as follows: the parameter of the illumination intensity Ec of the container body is initialized, and the illumination detection module is installed at the top of the inner side of the container door, as shown in fig. 2, wherein the illumination detection module adopts an illumination intensity sensor. The processor takes the illumination intensity Ec value of the container body acquired for the first time after power-up as the initial value of the illumination intensity Ec of the container body, and compares the initial value with a comparison reference Br to determine the initial state of the container door. The relationship between the illumination intensity Ec of the container body and the state of the container door is as follows: and Ec ═ Br, which indicates that the container door is closed. Ec > Br, indicating that the container door is open.

The second step is that: and acquiring the illumination intensity Ec of the container body. The illumination detection module collects samples of the illumination intensity Ec of the container body at the speed of 10Hz, and the processor calculates the average value of the samples of the illumination intensity Ec of the container body collected every second to obtain the illumination intensity Ec of the container body.

The third step: and comparing and judging the illumination intensity Ec of the container body with a comparison reference Br to obtain whether the current state of the door of the container is opened or closed.

The fourth step: and alarming the state of the box door. The current door state of the container is compared with the previous door state, when the two door states are inconsistent, the door state alarm of the container is generated, and the alarm type is shown in table 1.

TABLE 1 alarm watch for state of container door

Initial state of door	Current door state	Box door state alarm
			Door closure	Door opening	The door of the box is opened
Door closure	Door closure	Without alarm
			Door opening	Door opening	Without alarm
Door opening	Door closure	The door of the box is closed

The single-point illumination detection mode is continuously carried out in the time required to be monitored by the container, and the detection times can be obtained according to the time required to be monitored and the time of each detection.

The multipoint illumination detection mode is used for detecting the opening and closing state of a container door and the forcible entry state of a container body and comprises the following steps.

The first step is as follows: and selecting points. For multi-point illumination detection, firstly, the number of required illumination detection points is determined, for example, N illumination detection points are selected for illumination detection, as shown in fig. 3, the illumination detection points are sequentially arranged on the inner surface of the top of the container along the inward direction of the container door, and are sequentially a first illumination detection point to an nth illumination detection point, and each illumination detection point is provided with one illumination detection module, and is sequentially a first illumination detection module to an nth illumination detection module.

The second step is that: the comparison benchmark Br is initialized. And initializing a comparison reference Br according to the detection result of the first illumination detection module in the container door, wherein the corresponding relation between the comparison reference Br and the detection result of the first illumination detection module is shown in a table 2. And the comparison reference Br is used for determining the initial value of illumination in each depth area in the container body when the container door is in an open state.

Table 2 table comparing correspondence between reference Br and detection result of the first illumination detection module

And a third step of self-calibration, which is an optional step and can correct the comparison reference Br to ensure that the detection result is more accurate, wherein under the condition that the door state of the container door is opened, the container body illumination intensity Ec of each illumination detection point is detected to obtain the container body illumination intensity Ec of each illumination detection point, and the container body illumination intensity Ec is used as the calibration comparison reference Br 'of each illumination detection point, and when the error between the comparison reference Br and the calibration comparison reference Br' is within +/-10L x, the container body state is normal.

The fourth step: and collecting parameter samples. The processor collects the illumination intensity Ec of the container body of the N illumination detection modules in a polling mode, the collection period is 1 × N seconds, and a matrix Ec' [ Ec ] of the illumination intensity Ec of the container body of the current N illumination detection modules is obtained₁，Ec₂，Ec₃，…，Ec_n]. The processor calculates the average value of the container body illumination intensity Ec samples collected every second to obtain the container body illumination intensity Ec.

The fifth step: calculating the difference Z between the actual container body illumination intensity Ec of each illumination detection point in the container body and the comparison reference Br by the following formula:

Z＝[Z₁，Z₂，v，Z_n]＝[(Ec₁-Br₁)，(Ec₂-Br₂)，…，(Ec_n-Br_n)]。

and a sixth step: and constructing a two-dimensional fitting curve graph of the illumination intensity Ec of the container body. Constructing a fitting graph through a multi-point illumination detection matrix D, wherein the difference Z between the container body illumination intensity Ec of each illumination detection point and a comparison reference Br is used as a third parameter in the multi-point illumination detection matrix D to form (Ec)_n,Br_n,Z_n) Building a fitting curve graph by using the three-dimensional coordinates, wherein the specific building method is that the number of an illumination detection point on a two-dimensional plane is used as an X-axis coordinate, the value of illumination intensity Ec of the container body and a comparison standard Br is used as a Y-axis coordinate to respectively draw an illumination curve and a standard illumination curve, and a Z value is displayed in a single-point form; the reference illumination curve visually displays the illumination variation trend in the container in a graphical mode and is an initial value of a comparison reference; z value ofThe Z value of each illumination detection point can directly reflect the abnormal condition of each illumination detection point, the larger the Z value is, the higher the light transmission of the box body of the current detection point is, the higher the abnormal and damaged probability of the box body is, and the observation is convenient

The invention also discloses a container body intrusion detection system based on illumination, which comprises a memory, a processor, a computer program and a plurality of illumination detection modules, wherein the computer program is stored in the memory and can run on the processor, the illumination detection modules are all arranged at the top of the inner side of the container at preset intervals, the illumination detection modules adopt illumination intensity sensors, the illumination detection modules are all connected with the processor, and the processor executes the computer program to realize the steps of the container body intrusion detection method based on illumination. The processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.

Example of single point illumination detection.

Firstly, initializing a parameter of illumination intensity Ec of the container body, installing an illumination detection module at the top of the inner side of a container door, taking the illumination intensity E acquired for the first time after power-on as an initial value of the container illumination by a processor, comparing the illumination intensity Ec of the container body with a utilization coefficient E, wherein the utilization coefficient is 0.3 in the embodiment with a comparison reference Br of 0L x, and initializing the state of the container door.

The second step is that: the container body illumination intensity Ec is obtained, the illumination detection module collects container body illumination intensity Ec samples at the rate of 10Hz, 10 container body illumination intensity Ec samples are collected every second, the average value of the 10 container body illumination intensity Ec samples is calculated, and the current container body illumination intensity Ec is updated:

wherein Ec_iRepresenting the sample of the illumination intensity Ec of the ith container body collected.

The third step: and (6) data processing. 1. Comparing the illumination intensity Ec of the current container body with a comparison reference Br of 0lx, and updating the current container door state of the container; 2. and comparing the obtained current state of the container door with the initial state of the container door, and judging whether the state of the container door of the container changes.

The fourth step: and alarming the state of the box door. Entering the next working cycle when the state of the container door is not changed; when the state of the door of the container is changed, the alarm result of the door is given, and the next working period is entered after the initial state of the door is updated.

In a first scene, in an outdoor environment of a cloudy day, the illumination intensity E of natural light is 400 to 500lx, a container door is opened, Ec is E0.3 (400 to 500) 0.3 (120 to 150) L x, the container door is in an initial state of being opened, the container door is closed, and the illumination intensity Ec of the container body is 0L x.

Judging that the current state of the container door is the door closing state, and comparing the current state with the initial state of the container door to change the state of the container door; the state of the box door is changed from opening the box door to closing the box door, the alarm is given when the box door is closed, and the initial state of the box door is updated to be the closing of the box door; the next duty cycle is entered.

And a second scene, namely, a lighting environment of a night port, which is specified by the technical standard of port dangerous cargo container yard of the people's republic of China, wherein the lighting facility of the container yard meets the requirement of illumination intensity of loading and unloading operation, the average illumination intensity E at night is more than or equal to 20lx, the container door is opened, Ec is more than or equal to E0.3, more than or equal to 20 x 0.3, more than or equal to 6L x, the container door is in an initial state, the container door is opened, the container door is closed, the illumination intensity Ec of the container door is 0L x, the current state of the container door is judged to be the closed state of the container door, the current state of the container door is compared with the initial state of the container door, the state of the container door is changed from the open state of the container door to.

And a third scene, namely closing the door of the container, judging that the illumination intensity Ec of the container body in the container body is 0L x, and the initial state of the door is the door closed state, opening the door of the container, and the illumination intensity Ec of the container body is 0L x, judging that the current state of the door of the container is the door open state, comparing the current state with the initial state of the door of the container, changing the state of the door of the container from the door closed state to the door open state, giving an alarm when the door of the container is open, updating the current state of the door of.

Example of multipoint illumination detection.

In a clear outdoor environment, the illumination intensity E of natural light is 1500lx, a 40-foot container is selected, the length L of the inner wall of the container body is 12.032m, and the initial state of the door of the container is that the door is opened.

The first step is as follows: and selecting the number of illumination detection points. For the multi-point illuminance detection method, firstly, the required number N of illuminance detection points is determined, in this embodiment, 7 points are selected for illuminance detection, and the distance between each illuminance detection point from the first illuminance detection point is 2m, 1m, 1.5m, 2.5m, 2m and 3.032 m.

The second step, the comparison reference Br is initialized, the illumination intensity Ec of the container body of the detection result of the first illumination detection point in the door is 450L x, the state of the door is judged to be the opening of the door, and the door is opened according to the comparison reference formula Br_n＝Ec-(L₁L₂L₃… L n) M, obtaining a comparison reference Br in the box, and initializing the comparison reference Br as shown in fig. 4:

Br＝[450,383.4,350.1,300.15,216.9,150.3,49.3]。

the third step is self-calibration, starting the illumination detection module, detecting the illumination in the container body under the condition that the container door is opened, and acquiring a calibration comparison reference Br' of 7 illumination detection points, wherein as shown in figure 5, the error is within +/-10L x, and the container body state is normal:

Br′＝[440,380.4,360.1,305.15,210.9,145.3,44.5]。

the fourth step: and collecting parameter samples. The processor controls the illumination detection module to perform illumination collection for n times, wherein n is 10, and the illumination collection for 10 times is respectively performed on the first illumination detection pointTo the illuminance value Ec_1,1,Ec_1,2,Ec_1,3,Ec_1,4,Ec_1,5,Ec_1,6,Ec_1,7,Ec_1,8,Ec_1,9,Ec_1,10Obtaining the illumination intensity Ec of the container body at the first illumination detection point by the following formula₁：

Wherein Ec_1,iAnd the illumination value obtained by the ith illumination acquisition of the 1 st illumination detection module is represented. Ec was obtained in the same manner as described above₂，Ec₃，...，Ec₇，Ec′＝[Ec₁,Ec₂,…,Ec₇](ii) a When the container door is closed, Ec' obtained is [0,0,0,0,0 ═ 0]。

The fifth step: and processing sample data. Calculating to obtain a difference value Z between the actual container body illumination intensity Ec of each illumination detection point in the container body and a comparison reference Br:

Z＝[-440,-380.4,-360.1,305.15,210.9,145.3,-44.5]

and a sixth step: constructing a two-dimensional fitting graph of illuminance, constructing a fitting graph through a multi-point illuminance detection matrix D, wherein the difference value Z is used as a third parameter in the multi-point illuminance detection matrix D, and constructing the fitting graph, and the result is shown in FIG. 6, wherein it is assumed that coordinates of 7 illuminance detection points are respectively shown in Table 3:

TABLE 3 coordinate table of illuminance detection points

The illumination detection is performed on the interior of the container in a multi-point illumination detection mode, under the condition that the container body is in different states, the illumination intensity Ec of the container body is obtained through the illumination detection, and the data are processed to obtain the graph 7 and the graph 8. Fig. 7 is a two-dimensional fitting graph of the illumination intensity Ec of the container body inside the container body and the comparison reference Br when the tail of the container body is damaged, and it can be seen from the graph that the illumination intensity Ec of the container body at each illumination detection point inside the container body is opposite to the variation of the illumination intensity Ec of the container body at each illumination detection point inside the container body when the door is normally opened, and the illumination intensity Ec of the container body at the first illumination detection point is increased. Fig. 8 is a two-dimensional fitting graph of the illumination Ec of the container body inside the container body and the comparison standard Br under the condition that the middle part of the container body is damaged, and it can be seen from the graph that the illumination Ec of the container body inside the container body changes after the middle part of the container body is damaged, a parabolic curve is shown from the first illumination detection point, the illumination Ec of the container body is highest in the area closer to the middle part of the container body, and the illumination Ec of the container body on both sides of the container door and the container tail is basically consistent.

The container body intrusion detection method based on illumination of the invention detects single-point/multi-point illumination in the container body through the illumination intensity sensor to obtain the illumination intensity Ec of the container body, judges the opening and closing condition of the container door and the body breaking condition of the container through comparison with the comparison reference in the container body, provides real-time and reliable container body intrusion monitoring information for international multi-type intermodal transportation of the container, and can intuitively obtain the distribution condition of the container body breaking condition through the construction of a two-dimensional fitting curve graph of the illumination intensity Ec of the container body in the container body and the comparison reference Br.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.