阅读说明：本技术 一种库房现金存储方法以及装置 (Storehouse cash storage method and device ) 是由 刘世彦 王利华 于 2020-03-09 设计创作，主要内容包括：一种库房现金存储方法,包括以下步骤：获取现金捆钞的入库数据；根据入库数据生成二维码,通过二维码标记现金捆钞；获取现金捆钞的表面特征值,并结合二维码进行盘点；根据盘点结果进行调包检测；对盘点结果以及调包检测结果进行可视化展示,并生成告警信息；方法通过生成对应现金捆钞的入库数据的二维码,结合现金捆钞的相关图像特征进行现金的盘点与调包检测,并将检测结果进行可视化展示；相较于现有技术的盘点方式更加高效,在节约了大量的人力、时间成本的同时,还避免了操作误差；通过加入调包检测,规避了在存取过程中发生调包的情况。本发明可广泛应用于监控技术领域。(A vault cash storage method comprising the steps of: acquiring warehousing data of the cash bundle; generating a two-dimensional code according to the warehousing data, and marking the cash bundle through the two-dimensional code; acquiring a surface characteristic value of the cash bundle, and counting by combining the two-dimensional code; performing packet adjusting detection according to the checking result; visually displaying the checking result and the packet adjusting detection result and generating alarm information; the method comprises the steps of generating a two-dimensional code corresponding to warehouse-in data of cash bundles, performing cash counting and packet transferring detection by combining related image characteristics of the cash bundles, and visually displaying detection results; compared with the prior art, the checking method is more efficient, saves a large amount of labor and time cost, and avoids operation errors; by adding packet transferring detection, the condition of packet transferring in the access process is avoided. The invention can be widely applied to the technical field of monitoring.)

1. A vault cash storage method, comprising the steps of:

acquiring warehousing data of the cash bundle;

generating a two-dimensional code according to the warehousing data, and marking the cash bundle through the two-dimensional code;

acquiring the surface characteristic value of the cash bundle, and counting by combining the two-dimensional code;

performing packet adjusting detection according to the checking result;

visually displaying the checking result and the packet adjusting detection result, and generating alarm information;

the counting result comprises the number of bound banknotes, the number of the bound banknotes and associated information;

the associated information includes currency, amount and denomination.

2. The warehouse cash storage method according to claim 1, wherein the step of obtaining the surface characteristic value of the cash bundle and counting the cash bundle in combination with the two-dimensional code comprises:

acquiring an image of the cash bound with the two-dimensional code mark;

identifying the cash bundle and the two-dimensional code in the image, and scanning information of the two-dimensional code;

carrying out image segmentation according to the cash bundle and the two-dimensional code in the image;

counting the number of the two-dimensional codes after the image segmentation is finished;

and outputting the number statistical result of the two-dimension codes and the information of the two-dimension codes.

3. The warehouse cash storage method according to claim 1, wherein the step of performing packet adjustment detection according to the checking result specifically comprises:

acquiring an image of the cash bundling current time after the two-dimensional code marking is finished;

carrying out image segmentation according to the cash bundle and the two-dimensional code in the image;

performing image feature extraction on the cash bundle after image segmentation is completed;

carrying out similarity comparison on the image characteristics and the image characteristics at the last moment;

and outputting a packet adjusting detection result according to the similarity comparison result.

4. The warehouse cash storage method of claim 2, wherein the step of identifying the cash bundle and the two-dimensional code in the image specifically comprises:

extracting a candidate area according to the image of the cash bundle marked by the two-dimensional code;

carrying out standardization processing on the candidate region;

performing feature extraction on the normalized candidate region;

training a classification model through the extracted features;

and finishing the identification of the cash bundle and the two-dimensional code in the image according to the trained classification model.

5. The vault cash storage method of claim 3, wherein said step of performing a bag-adjusting detection according to the checking result further comprises:

acquiring two-dimensional code information of the cash bound money at the previous moment;

matching the two-dimension code information with the two-dimension code of the cash bundle at the current moment one by one;

and outputting a packet adjusting detection result according to the matching result.

6. A vault cash storage method according to claim 3 wherein said image features include: the two-position code information characteristic, the two-dimension code position characteristic, the paper currency appearance characteristic and the paper currency fold characteristic.

7. A method for vault cash storage according to any of claims 2 or 3 wherein said image segmentation includes at least one of: threshold segmentation, region segmentation, and edge segmentation.

8. A vault cash storage device, comprising: the device comprises a camera module, a main control module, a power supply module and a storage cabinet;

the camera module is used for acquiring visual data;

the master control module comprises:

the storage unit is used for storing the warehousing data of the cash bundle;

the marking unit is used for generating a two-dimensional code according to the warehousing data and marking the cash bundle through the two-dimensional code;

the data processing unit is used for acquiring the surface characteristic value of the cash bundle, checking the cash bundle by combining the two-dimensional code and performing packet transferring detection according to a checking result;

the display and alarm unit is used for visually displaying the checking result and the packet adjusting detection result and generating alarm information;

the storage cabinet is used for storing cash bundles, and the power supply module is used for supplying power.

9. The vault cash storage apparatus of claim 8, wherein said storage cabinet comprises: the device comprises a lighting device, a positioning groove and a positioning grid;

the storage cabinet is internally provided with an interlayer, the positioning groove is formed in the upper surface of the interlayer, and the positioning grids are arranged on the positioning groove; the lighting device is arranged on the lower surface of the interlayer and the inner surface of the top of the storage cabinet.

10. The vault cash storage device of claim 8, wherein said master control module further comprises:

and the lamp control module is used for controlling the lighting device to carry out alarm information indication.

Technical Field

The invention relates to the technical field of monitoring, in particular to a storehouse cash storage method and device.

Background

Cash is an exchange medium that can be put into circulation immediately within a certain range. Cash is universally accepted and can be effectively used immediately to purchase goods, labor or repayment debts, the most mobile asset. At present, a large amount of cash is mainly stored in various medium and large-sized vaults in a goods shelf storage mode, and the checking mode mainly adopts manual checking; in addition, some large-medium-sized treasuries adopt RFID technical means to carry out inventory.

However, the two methods have certain defects, the manual inventory making efficiency is low, the accuracy is difficult to control, and a large amount of time cost and labor cost are consumed; the counter with the RFID function is adopted for counting and storing, and the problem of whether cash is transferred or not can not be solved. Therefore, either manually or by RFID has certain drawbacks.

Disclosure of Invention

It is therefore an object of the present invention to at least partially solve one of the problems of the prior art, and to provide a method for storing cash in a vault, which is efficient and can avoid the situation of bag change, and a cash storage device for the vault, which can be used to implement the method.

In order to achieve the technical purpose, the technical scheme adopted by the embodiment of the invention comprises the following steps:

in a first aspect, an embodiment of the present invention provides a warehouse cash storage method, including the following steps:

acquiring warehousing data of the cash bundle;

generating a two-dimensional code according to the warehousing data, and marking the cash bundle through the two-dimensional code;

acquiring a surface characteristic value of the cash bundle, and counting by combining the two-dimensional code;

performing packet adjusting detection according to the checking result;

visually displaying the checking result and the packet adjusting detection result and generating alarm information;

the counting result comprises the number of bound banknotes, the number of the bound banknotes and associated information;

the associated information includes currency, amount and denomination.

Further, in the method according to the embodiment of the present invention, the step of obtaining the surface characteristic value of the cash bundle and counting the cash bundle by combining the two-dimensional code includes:

acquiring an image of the cash bound with the two-dimensional code mark;

identifying the cash bundle and the two-dimensional code in the image, and scanning information of the two-dimensional code;

carrying out image segmentation according to the cash bundle and the two-dimensional code in the image;

counting the number of the two-dimensional codes after the image segmentation is finished;

and outputting the number statistical result of the two-dimension codes and the information of the two-dimension codes.

Further, in the method according to the embodiment of the present invention, the step of performing packet scheduling detection according to the inventory result specifically includes:

acquiring an image of the cash bundling current time after the two-dimensional code marking is finished;

carrying out image segmentation according to the cash bundle and the two-dimensional code in the image;

performing image feature extraction on the cash bundle after image segmentation is completed;

comparing the similarity of the image characteristic with the image characteristic at the last moment;

and outputting a packet adjusting detection result according to the similarity comparison result.

Further, in the method according to the embodiment of the present invention, the step of identifying the cash bundle and the two-dimensional code in the image specifically includes:

extracting a candidate area according to the image of the cash bundle marked by the two-dimensional code;

carrying out standardization processing on the candidate region;

performing feature extraction on the normalized candidate region;

training a classification model through the extracted features;

and finishing the identification of the cash bundle and the two-dimensional code in the image according to the trained classification model.

Further, in the method according to the embodiment of the present invention, the step of performing packet scheduling detection according to the inventory result further includes:

acquiring two-dimensional code information of the cash bound money at the previous moment;

matching the two-dimension code information with the two-dimension code of the cash bundle at the current moment one by one;

and outputting a packet adjusting detection result according to the matching result.

Further, in the method according to the embodiment of the present invention, the image feature includes: the two-position code information characteristic, the two-dimension code position characteristic, the paper currency appearance characteristic and the paper currency fold characteristic.

Further, in the method according to the embodiment of the present invention, the image segmentation includes at least one of: threshold segmentation, region segmentation, and edge segmentation.

In a second aspect, an embodiment of the present invention provides a vault cash storage device, which may be used to implement the method of the foregoing embodiment, and includes: the device comprises a camera module, a main control module, a power supply module and a storage cabinet;

the camera module is used for acquiring visual data;

the main control module comprises:

the storage unit is used for storing the warehousing data of the cash bundle;

the marking unit is used for generating a two-dimensional code according to the warehousing data and marking the cash bundle through the two-dimensional code;

the data processing unit is used for acquiring the surface characteristic value of the cash bundle, counting the cash bundle by combining the two-dimensional code and carrying out packet transferring detection according to a counting result;

the display and alarm unit is used for visually displaying the checking result and the packet adjusting detection result and generating alarm information;

the storage cabinet is used for storing cash bundles, and the power supply module is used for supplying power.

Further, in the apparatus according to the embodiment of the present invention, the storage cabinet includes: the device comprises a lighting device, a positioning groove and a positioning grid;

an interlayer is arranged in the storage cabinet, the positioning groove is arranged on the upper surface of the interlayer, and the positioning grids are arranged on the positioning groove; the lighting device is arranged on the lower surface of the interlayer and the inner surface of the top of the storage cabinet.

Further, in the apparatus according to the embodiment of the present invention, the main control module further includes: and the lamp control module is used for controlling the lighting device to carry out alarm information indication.

Advantages and benefits of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention:

the embodiment of the invention provides a warehouse cash storage method, which comprises the steps of generating two-dimensional codes corresponding to warehouse entry data of cash bundles, performing cash counting and packet transferring detection by combining related image characteristics of the cash bundles, and visually displaying detection results; compared with the prior art, the checking method is more efficient, saves a large amount of labor and time cost, and avoids operation errors; by adding packet transferring detection, the condition of packet transferring in the access process is avoided.

The embodiment of the invention provides a storehouse cash storage device, which comprises a camera module, a main control module, a power module and a storage cabinet; the method comprises the steps that the characteristic value of the surface of a money bundle is shot, two-dimensional code information is read and transmitted to a main control module, the counting of the number of cash is completed, and package transferring detection is carried out; compare in traditional storage packing cupboard not only possess the function of transferring the package to detect, simple structure moreover, the simple operation uses in a flexible way, can extensively promote.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description is made on the drawings of the embodiments of the present invention or the related technical solutions in the prior art, and it should be understood that the drawings in the following description are only for convenience and clarity of describing some embodiments in the technical solutions of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flow chart illustrating steps of a method for storing cash in a warehouse according to an embodiment of the present invention;

FIG. 2 is a block diagram of a cash storage device control system for a vault in accordance with an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a vault cash storage device according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another storehouse cash storage device according to an embodiment of the present invention.

Reference numerals: 101. a storage cabinet; 102 positioning grooves; 103. positioning grids; 104. an illumination device; 105. the camera module.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. The step numbers in the following embodiments are provided only for convenience of illustration, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.

Hereinafter, a method and an apparatus for storing cash in a vault according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, and first, a method for storing cash in a vault according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to fig. 1, the warehouse cash storage method in this embodiment mainly includes steps S1-S5:

s1, acquiring warehousing data of the cash bundle; specifically, when the cash is put in storage, all the cash stored this time needs to be checked, and bundled according to a certain number, and the amount, currency, amount and face value of each bundle of cash is recorded. Further, in the present embodiment, the cash storage method may include a method of bundling cash, a method of cash box, and the like, in addition to the method of bundling cash.

S2, generating a two-dimensional code according to the warehousing data, and marking cash bundle money through the two-dimensional code; specifically, the number, currency, amount and face value of each bundle of cash recorded in the step S1 are correspondingly generated to form a two-dimensional code; the two-dimensional code contains the unique serial number information of the bundle of paper money; and sticking the generated two-position code label to the surface of the banknote bundle.

S3, acquiring the surface characteristic value of the cash bundle, and counting by combining the two-dimensional code; in some embodiments, step S3 may be further subdivided into steps S31-S35:

s31, acquiring an image of the cash bundle marked by the two-dimensional code; specifically, after the cash is bound the paper money and is accomplished the pasting mark that corresponds two-bit sign, save it, the real-time condition that the cash of catching storage was bound the paper money through the module of making a video recording of storage device (equipment), acquires all cash and binds the monitoring picture of paper money.

S32, identifying the cash bundle and the two-dimensional code in the image, and scanning information of the two-dimensional code; specifically, when a monitoring picture at the current moment is captured through the camera module, a picture image of the current frame is selected, cash bundling and two-dimensional codes in the image are distinguished and identified through an algorithm based on deep learning, and a two-dimensional code detected by identification is scanned to obtain information of the two-dimensional code. In some alternative embodiments, the step S32 of identifying the cash bundle and the two-dimensional code in the image may be further subdivided into steps S321-S325:

s321, extracting a candidate region according to the image of the cash bundle marked by the two-dimensional code; that is, the screen image of the current frame is subjected to selection of candidate regions by an ss (selective search) method, and a certain number of candidate regions are extracted.

S322, carrying out standardization processing on the candidate region; in order to facilitate subsequent data processing, the main control accelerates convergence when a program runs, and the candidate area is properly scaled, so that the phenomenon that the span is too large and the edge pixels are erased is prevented.

S323, extracting the characteristics of the standardized candidate area; all candidate regions that will be normalized are feature-engineered by CNN (Convolutional Neural Networks).

S324, training a classification model through the extracted features; training an SVM (support vector Machine) classifier through feature engineering constructed by CNN.

S325, recognizing the cash bundle and the two-dimensional code in the image according to the trained classification model; and identifying and distinguishing the cash bundle and the two-dimensional code in each frame of image through the trained SVM classifier, and scanning the two-dimensional code to obtain the number, currency type, amount and face value of the cash stored in the two-dimensional code and the unique number corresponding to the cash bundle.

S33, carrying out image segmentation according to the cash bundle and the two-dimensional code in the image; specifically, each bundle of cash in the acquired image is divided through image segmentation; in the present embodiment, the image segmentation can be performed by means of threshold segmentation, region segmentation, edge segmentation, and the like.

S34, counting the number of the two-dimensional codes after the image segmentation is completed; specifically, the number of the current cash bundles in the storage device after image segmentation is counted.

S35, outputting the two-dimension code number and the two-dimension code information, where the output includes the serial number of the cash bundle, the current cash bundle number, and the currency, amount and denomination, for example, the output at a certain time is:

number of bundles: 1; bundling the paper money and numbering: a2-0201-7; and (4) correlation information: the coin type: RMB; amount of money: 10000; and (3) face value: 100.

s4, performing packet adjusting detection according to the checking result; in some alternative embodiments, step S4 may be subdivided into steps S41-S45:

s41, acquiring the current image of the cash bound with the two-dimensional code mark; specifically, when the stored cash bound cash is monitored in real time, the two-dimensional code information of all the cash bound cash in the storage device at the current moment and the total number of the cash bound cash are stored by setting a time interval; and then, continuously carrying out real-time monitoring until a fixed time interval, and acquiring a monitoring image at the current moment.

S42, carrying out image segmentation according to the cash bundle and the two-dimensional code in the image; specifically, the two-dimensional code and the cash bundle in the monitoring image at the current moment are identified and segmented through image segmentation.

S43, extracting image features of the cash bundle after image segmentation is completed; specifically, image features of the image content of the divided cash bundle are extracted, and the image features are stored. In this embodiment, the image characteristics of the selected cash bundle include: the two-position code information characteristic, the two-dimension code position characteristic, the paper currency appearance characteristic and the paper currency fold characteristic.

S44, carrying out similarity contrast on the image characteristics and the image characteristics at the previous moment; specifically, according to the image feature information at the current moment, the similarity of the image feature information at the current moment is compared with the similarity of the image feature information stored at the previous moment, a threshold value is judged according to the preset similarity, and when the similarity is lower than the threshold value, the cash bundle is determined to be turned.

S45, outputting a packet adjusting detection result according to the similarity comparison result; the information of the cash bundle which is identified as being changed is transmitted back to the main control device, and then the information is displayed visually.

As an optional implementation manner, the embodiment of the warehouse cash storage method, performing a bag adjustment detection step according to the checking result, and further including:

acquiring two-dimensional code information of the cash bound money at the previous moment;

matching the two-dimension code information with the two-dimension code of the cash bundle at the current moment one by one;

and outputting a packet adjusting detection result according to the matching result.

Specifically, after the cash is stored and withdrawn for many times, a large amount of time and labor cost are consumed for putting the cash bundle into the original position, and meanwhile, misoperation cannot be avoided; therefore, by acquiring the two-dimensional code information carried by all the cash bound banknotes in the storage device at the previous moment and the two-dimensional code information carried by all the cash bound banknotes in the storage device at the current moment, and comparing the two-dimensional code information one by one, when the two same two-dimensional codes appear before and after detection, but the consistency comparison of the image characteristics of the cash bound banknotes at the original position at the later moment does not reach a threshold value, the situation that only the position change of the cash bound banknotes occurs but the bag transferring action is not generated can be determined.

And S5, visually displaying the checking result and the packet adjusting detection result, and generating alarm information. In addition, when the cash delivery operation is completed, the two-dimensional code of the taken cash bundle is scanned through the handheld mobile terminal, after the taking is confirmed, the handheld mobile terminal sends a request instruction to the main control, after the main control authorizes the request, the stored two-dimensional code information of the cash bundle is deleted, and the picture information corresponding to the cash bundle is deleted at the same time, so that the cash delivery operation is completed.

In another aspect, referring to fig. 2, there is provided an embodiment of a storage apparatus for implementing a vault cash storage method, the vault cash storage apparatus including: the device comprises a camera module, a main control module, a power supply module and a storage cabinet;

the camera module is used for acquiring visual data;

the main control module comprises:

the storage unit is used for storing the warehousing data of the cash bundle;

the marking unit is used for generating a two-dimensional code according to the warehousing data and marking the cash bundle through the two-dimensional code;

the data processing unit is used for acquiring the surface characteristic value of the cash bundle, counting the cash bundle by combining the two-dimensional code and carrying out packet transferring detection according to a counting result;

the display and alarm unit is used for finishing the visual display of the checking result and the packet adjusting detection result and generating alarm information;

the storage cabinet is used for storing cash bundles, and the power supply module is used for supplying power.

As an optional implementation manner, the main control module further includes: and the lamp control module is used for controlling the lighting device to carry out alarm information indication. When the abnormal position is confirmed after the checking and the packet adjusting detection, the position is marked by changing the color of the light; meanwhile, the lamp control module can also control the lighting device to perform checking and sorting indication.

Referring to fig. 3, as an alternative embodiment, the storage cabinet includes: a lighting device 105, a positioning groove 102 and a positioning grid 103; an interlayer is arranged in the storage cabinet 101, the positioning groove 102 is arranged on the upper surface of the interlayer, and the positioning grid 103 is arranged on the positioning groove 102; the lighting device 104 is arranged on the lower surface of the partition and the top of the storage cabinet 101, and the camera module 105 is arranged on the lower surface of the partition and the inner surface of the top of the storage cabinet 101. For example, in the embodiment, each layer in the storage cabinet is provided with four cameras, the cameras are arranged on the central line at the top of each layer, and the lenses take pictures vertically downwards; the position of the camera can be adjusted in three-dimensional direction by the camera mounting station; the two-dimensional code surfaces of the money bundles to be tested are placed upwards, checking and package adjusting detection are carried out, positioning grids are arranged on each layer, and money bundle positioning grooves are formed in the bottoms of the positioning grids, so that the money bundles are placed consistently.

Referring to fig. 4, as an alternative embodiment, the cash bundling machine comprises at least two storage cabinets 101, the storage cabinets 101 are divided into 3 × unit grids, the lighting device 104 is also arranged on the lower surface of the partition and the top of the storage cabinet 101, the camera module 105 is arranged at a fixed position on each layer, for example, on a vertical pillar, two camera modules 105 arranged on each layer are used for shooting opposite objects in the outward forward direction, a station of the camera module can realize three-dimensional orientation adjustment, when the cash bundling machine is put in a warehouse, the cash bundling machine placed on the storage cabinets has one side adhered with a two-dimensional code (namely, the camera module facing the opposite storage cabinet) facing outward, further, the storage cabinet 101 can be a container suitable for placing cash bundling machines, for example, fig. 4, the left side of fig. 4 is the bundling storage cabinet, the right side is the cash bundling storage cabinet, the front and the back side of the cash bundling machine (namely, two sides of the cash bundling machine are provided with the camera module 105 at a fixed position on each layer, for example, the vertical pillar, the camera module can also realize three-dimensional orientation adjustment, and the camera module × unit is provided with a visual field distance of the camera module for ensuring that the cash bundling machine is positioned in a range of 650mm, and the camera module is smaller than 650mm, and the camera module is used for ensuring that the camera module is positioned in the camera module when the camera module positioned in the vertical camera module when the vertical camera module.

In summary, compared with the prior art, the technical scheme of the invention has the following advantages:

(1) the method provided by the embodiment of the invention has high checking efficiency and strong accuracy, can detect cash in real time, and accurately and respectively solves the abnormal problems;

(2) the method provided by the embodiment of the invention combines the image characteristics and the two-dimension code information to detect whether the money bundle is dropped in real time;

(3) the method provided by the embodiment of the invention is convenient for warehouse entry and exit operation and plays a role in real-time inventory;

(4) the device provided by the embodiment of the invention has the advantages of simple structure, convenience and quickness in operation, flexibility in use and capability of being widely popularized.

In alternative embodiments, the functions/acts noted in the block diagrams may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Furthermore, the embodiments presented and described in the flow charts of the present invention are provided by way of example in order to provide a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and in which sub-operations described as part of larger operations are performed independently.

In the foregoing description of the specification, reference to the description of "one embodiment/example," "another embodiment/example," or "certain embodiments/examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.