阅读说明：本技术 一种播放控制方法、装置、存储介质及电视机 (Playing control method, device, storage medium and television ) 是由 陆军锋 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种播放控制方法、装置、存储介质及电视机,所述方法包括：根据输入的操作指令,启动预设的儿童模式,所述儿童模式中设置有多种观看状态功能；根据所述儿童模式,调用所述观看状态功能,并基于所述观看状态功能进行视频播放,以使电视机提供符合儿童特点的电视观看模式,并解决了现有技术中儿童观看模式功能单一且无趣的问题。(The invention discloses a playing control method, a device, a storage medium and a television, wherein the method comprises the following steps: starting a preset child mode according to an input operation instruction, wherein the child mode is provided with a plurality of watching state functions; and calling the watching state function according to the child mode, and playing the video based on the watching state function so as to enable the television to provide a television watching mode according with the characteristics of the child, and solve the problems of single function and no interest of the child watching mode in the prior art.)

1. A playback control method, comprising:

starting a preset child mode according to an input operation instruction, wherein the child mode is provided with a plurality of watching state functions;

and calling the watching state function according to the child mode, and playing the video based on the watching state function.

2. The playback control method of claim 1, wherein the starting of the preset child mode according to the input operation command comprises:

entering a child mode starting page according to the operation instruction, wherein a permission judging program is arranged in the child mode starting page;

judging whether the authority to enter the child mode is available or not according to the authority judging program;

and if so, entering the child mode.

3. The playback control method of claim 2, wherein the starting of the preset child mode according to the input operation command comprises:

if not, controlling the television to enter a screen protection control state, wherein the functions of the keys of the television and the remote controller are invalid in the screen protection control state.

4. The playback control method according to claim 1, wherein the invoking the viewing status function according to the child mode and playing back the video based on the viewing status function comprises:

when the television is played in a child mode, calling a duration obtaining function in the watching state function;

acquiring playing time according to the time acquisition function, and comparing the playing time with a preset time threshold;

and when the playing time reaches the time threshold, controlling the television to enter a screen protection control state.

5. The playback control method according to claim 1, wherein the invoking the viewing status function according to the child mode and playing back the video based on the viewing status function comprises:

when the television is played in a child mode, calling a display amplification function in the watching state functions;

amplifying the fonts displayed in the screen according to the display amplification function;

and displaying the enlarged font again.

6. The playback control method according to claim 1, wherein the invoking the viewing status function according to the child mode and playing back the video based on the viewing status function comprises:

when the television is played in a child mode, calling a content acquisition function in the watching state function;

based on the content acquisition function, acquiring the content being played by the television;

and when the content being played does not belong to the children watching content, playing reminding is carried out so as to remind a user to adjust the played content.

7. The playback control method according to claim 1, wherein the invoking the viewing status function according to the child mode and playing back the video based on the viewing status function comprises:

when the television is played in a child mode, calling a sitting posture judgment function in the watching state function;

acquiring the current sitting posture of the user according to the sitting posture judging function, and judging whether the current sitting posture judgment of the user is standard or not;

and if the current sitting posture of the user is not standard, carrying out sitting posture reminding to remind the user to adjust the sitting posture.

8. A playback control apparatus, characterized in that the apparatus comprises:

the mode starting unit is used for starting a preset child mode according to an input operation instruction, and the child mode is provided with a plurality of watching state functions;

and the playing control unit is used for calling the watching state function according to the child mode and playing the video based on the watching state function.

9. A television comprising a memory, and one or more programs, wherein the one or more programs are stored in the memory, and wherein the one or more programs being configured to be executed by the one or more processors comprises instructions for performing the method of any of claims 1-7.

10. A non-transitory computer readable storage medium having instructions therein, which when executed by a processor of an electronic device, enable the electronic device to perform the method of any one of claims 1-7.

Technical Field

The present invention relates to the field of digital television technologies, and in particular, to a play control method, a play control device, a television, and a storage medium.

Background

Nowadays, digital television programs are rich in variety, and watching television programs is an indispensable entertainment mode for daily leisure life of the public, but a normal watching mode is not suitable for children, and the health of the children can be damaged when the children watch the television programs for a long time. Although the prior art also designs a child watching mode aiming at a child group, the function is single and uninteresting because the watching time is generally limited or the television is simply locked through a password.

Thus, there is a need for improvements and enhancements in the art.

Disclosure of Invention

The present invention provides a playing control method, an apparatus, a storage medium and a television set to solve the above-mentioned drawbacks of the prior art, and aims to solve the problem that the child watching mode in the prior art is single in function and uninteresting.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

in a first aspect, an embodiment of the present invention provides a play control method, where the method includes:

starting a preset child mode according to an input operation instruction, wherein the child mode is provided with a plurality of watching state functions;

and calling the watching state function according to the child mode, and playing the video based on the watching state function.

In one implementation method, the starting a preset child mode according to an input operation instruction includes:

entering a child mode starting page according to the operation instruction, wherein a permission judging program is arranged in the child mode starting page;

judging whether the authority to enter the child mode is available or not according to the authority judging program;

and if so, entering the child mode.

In one implementation method, the starting a preset child mode according to an input operation instruction includes:

if not, controlling the television to enter a screen protection control state, wherein the functions of the keys of the television and the remote controller are invalid in the screen protection control state.

In one implementation, the invoking the viewing state function according to the child mode and playing the video based on the viewing state function includes:

when the television is played in a child mode, calling a duration obtaining function in the watching state function;

acquiring playing time according to the time acquisition function, and comparing the playing time with a preset time threshold;

and when the playing time reaches the time threshold, controlling the television to enter a screen protection control state.

In one implementation, the invoking the viewing state function according to the child mode and playing the video based on the viewing state function includes:

when the television is played in a child mode, calling a display amplification function in the watching state functions;

amplifying the fonts displayed in the screen according to the display amplification function;

and displaying the enlarged font again.

In one implementation, the invoking the viewing state function according to the child mode and playing the video based on the viewing state function includes:

when the television is played in a child mode, calling a content acquisition function in the watching state function;

based on the content acquisition function, acquiring the content being played by the television;

and when the content being played does not belong to the children watching content, playing reminding is carried out so as to remind a user to adjust the played content.

In one implementation, the invoking the viewing state function according to the child mode and playing the video based on the viewing state function includes:

when the television is played in a child mode, calling a sitting posture judgment function in the watching state function;

acquiring the current sitting posture of the user according to the sitting posture judging function, and judging whether the current sitting posture judgment of the user is standard or not;

and if the current sitting posture of the user is not standard, carrying out sitting posture reminding to remind the user to adjust the sitting posture.

In a second aspect, an embodiment of the present invention provides a playback control apparatus, where the apparatus includes:

the mode starting unit is used for starting a preset child mode according to an input operation instruction, and the child mode is provided with a plurality of watching state functions;

and the playing control unit is used for calling the watching state function according to the child mode and playing the video based on the watching state function.

In a third aspect, an embodiment of the present invention provides a television set, which includes a memory, and one or more programs, where the one or more programs are stored in the memory, and configured to be executed by one or more processors includes a function for performing any one of the methods described above.

In a fourth aspect, embodiments of the present invention provide a non-transitory computer-readable storage medium, wherein instructions of the storage medium, when executed by a processor of an electronic device, enable the electronic device to perform any one of the methods described above.

Has the advantages that: according to the method, a preset child mode is started according to an input operation instruction, and a plurality of watching state functions are set in the child mode; after the child mode is started, the watching state function is called, the television can play videos based on the watching state function, so that a television watching mode which accords with the characteristics of children is provided, and the problems that the child watching mode in the prior art is single in function and uninteresting are solved.

Drawings

Fig. 1 is a schematic flow chart of a play control method provided by the present invention;

fig. 2 is a schematic flowchart of an authority determination procedure in a play control method according to an embodiment of the present invention;

fig. 3 is a schematic flow chart illustrating a process of calling a display magnification function in the play control method according to the embodiment of the present invention;

fig. 4 is a schematic flowchart of a call duration obtaining function in the play control method according to the embodiment of the present invention;

fig. 5 is a schematic flow chart illustrating a process of invoking a content obtaining function in a play control method according to an embodiment of the present invention;

fig. 6 is a schematic flow chart illustrating a function of calling a sitting posture determination function in the play control method according to the embodiment of the present invention;

fig. 7 is a schematic block diagram of a playing apparatus provided in an embodiment of the present invention;

fig. 8 is a schematic block diagram of an internal structure of a television according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

With the development of digital television services and multimedia and the improvement of living standard of people, watching television programs becomes a very important entertainment mode in daily leisure activities of people, but some television programs are not suitable for children to watch, and particularly, the television does not set a definite grading system, and in many video resources which look good for people of all ages, some contents which are not suitable for children to watch may exist. Violence, bloody smell and erotic emotion, which are very irritating episodes, too many contacts are necessary to be adverse to the mental health of children. In addition, the health of children can be affected by watching television for a long time, and the diseases of children caused by the television are more and more found by investigation, such as television obesity, television dyspepsia, television ophthalmopathy and television short stature. However, most parents are busy working and cannot control the children to watch the television at any time, the existing watching mode of the children only limits the watching time or the mode of turning on the television, the function is single and uninteresting, and the function does not accord with the characteristics of the children. Therefore, the prior art still lacks a child watching mode which is in line with the characteristics of children, has rich functions and is full of interest.

In view of the above-mentioned drawbacks of the prior art, the present invention provides a playing control method, which enables a child to better utilize a television by setting a plurality of viewing state functions in a child viewing mode. As shown in fig. 1, the method includes the following:

and S100, starting a preset child mode according to an input operation instruction, wherein the child mode is provided with a plurality of watching state functions.

In one implementation, the user may input an operation instruction in voice to start the child mode. Specifically, a processor and a voice signal receiving device connected with the processor are pre-installed in the television, when the television is used, a user sends a sound signal to the television, the voice signal receiving device of the television receives the sound signal sent by the user and sends the sound signal to the processor, the processor reads control information in the sound signal according to the sound signal, generates a control instruction according to the read control information and sends the control instruction to the television, and the television executes corresponding work according to the control instruction. For example, when the sound signal sent by the user is "child mode", the control instruction received by the television is "child mode on", and the operation of turning on the child mode is executed. If the control information in the sound signal cannot be read, the processor controls the television to display a word of 'reading error' to indicate the user to send out the sound signal again.

In order to facilitate the user to invisibly supervise the child watching tv also when not at home, in one implementation the tv set may be remotely controlled by a smartphone. Specifically, the television is provided with a networking function, the smart phone is connected with the television through a network, when interaction between the television and the smart phone is successfully established, a user inputs a mode name through the smart phone, generates a play command and sends the play command to the television, and after the television receives the play command, the television plays a watching mode expected by the user according to the play command. In addition, the user can also master the dynamic state in real time through the smart phone when the child turns on the television, so that the parent can follow the mental life of the child, or can find the program content in time if the program content is bad, and the child is prevented from being influenced greatly.

In one implementation, as shown in fig. 2, the entering a child mode launch page according to the operation instruction includes the following steps:

step S101, entering a child mode starting page according to the operation instruction, wherein a permission judging program is arranged in the child mode starting page;

step S102, judging whether the authority to enter the child mode exists or not according to the authority judging program;

if yes, executing step S103, and entering the child mode;

if not, executing the step S104, and enabling the television to enter a screen protection control state, wherein in the screen protection control state, the functions of the keys of the television and the remote controller are invalid.

Specifically, in order to increase interest and knowledge of the child mode, the permission determination program may be an answer point mode. When the television enters a child mode to start a page, the title content is displayed on the screen, and the title content can be set by a user. The children need to answer according to the content of the current question, the answering mode can be achieved through voice answering (for example, the television needs to be provided with a voice receiving device in advance) or through remote control of a remote controller (for example, the question is a selected question, the children select an option through the remote controller and click to determine and then complete answering), after the children complete answering, the television judges whether the answering is correct, when the children answer is correct, an integral is generated, when the answering is wrong, no integral is generated, the integral can be accumulated, for example, each question is set to be 10 minutes, one answer is accumulated ten minutes, two minutes are accumulated when the answering is wrong, and when the answering is wrong, the current question has no score. And when the integral is accumulated to a set value, judging that the answerer has the permission to enter the child mode, and enabling the television to enter the child mode. For example, the number of questions is set to be ten in the permission judging program, every question is ten, the number of answers to one question is accumulated to be ten, the current question has no score if the answer is wrong, and the television enters the child mode when the score is accumulated to eighty minutes. And when the integral does not meet the set value, judging that the answerer does not have the authority of entering the child mode, and enabling the television to enter a screen protection control state. Under the screen protection control state, the functions of the keys of the television and the remote controller are invalid, namely, the answerer can not control the television to enter the watching mode by operating the keys of the television and the remote controller. In one implementation, after the television enters the screen protection state, the television screen enters a countdown state, the countdown duration can be set by the user, and after the countdown time is cleared, the answerer can answer the question again. The permission judging program has interestingness and knowledge, and the answering result is directly hooked with whether the television can be watched, so that a certain learning incentive effect is achieved, the learning mind of the children is changed into initiative, and the interest and enthusiasm of the children in learning are effectively stimulated.

After the permission judging program is finished, the television enters a child mode, a user can select various watching state functions in the child mode, and the television plays programs based on the watching state functions selected by the user. Namely, step S200 in fig. 1 is executed, the viewing state function is called according to the child mode, and video playing is performed based on the viewing state function.

In one implementation, when the television is in the child mode for playing, the display amplification function in the viewing state functions is automatically invoked, as shown in fig. 3, the invoking of the display amplification function in the viewing state functions includes the following steps:

s201, when the television is played in a child mode, calling a display amplification function in the watching state functions;

s202, amplifying fonts displayed in a screen according to the display amplification function;

and S203, displaying the enlarged font again.

Specifically, the display amplification function can be combined with an eye protection mode, and the font size, brightness and color of the television screen can be adjusted in a targeted manner aiming at the condition that the vision of the minors is not developed to be mature, so that the vision of children is effectively protected.

However, the children often drown in the television programs and cannot make the television programs, so measures need to be taken to force the children to get out of the television programs, and the damage to eyesight and health caused by too long watching time is avoided. In one implementation, after the television enters the child mode, the user may call a duration obtaining function in the watching function, the television obtains a video playing duration according to the duration obtaining function, compares the playing duration with a preset duration threshold, and when the playing duration reaches the duration threshold, controls the television to enter the screen protection control state, that is, executes steps S211, S212, and S213 in fig. 4. Specifically, a counter for calculating the playing time of the video is preset in the television, the timer starts to work when the television enters a child mode, when the recording time of the timer reaches a preset time threshold, the television enters a screen protection state, the television screen enters a countdown state, and the television program can be watched again after the countdown time is cleared.

In one implementation, when the playing time reaches a preset value during the process of watching a television program in the child mode, the television re-executes an authority judgment program, which is the same as the above and will not be described again here. That is, when the duration of watching the television program reaches the preset value, the child needs to enter the answering integral mode again, and the accumulated integral reaches the set value, so that the next watching can be performed. In one implementation, when a child watches a television program in a child mode, and after the child enters a next watching process through a completion permission judgment program, the television directly enters a screen protection control state when the playing time of the television program reaches a preset time threshold. Namely, after the children watch the television programs twice continuously, the television directly enters a screen saver control state, the screen saver control state is set to a countdown mode, and the children can watch the television again through the answer integration mode after waiting for the countdown and zero clearing.

In one implementation, the television may enter the screen saver control state periodically according to a time period preset by a user. For example, the user can set learning time, eating time, playing time, entertainment time, resting time, and the like according to the work and rest time of the child. In the study time, the dining time, the playing time and the rest time, the television automatically enters a screen protection control state as soon as the set time is reached, and the television can watch television programs only when the keys and the remote controller of the television recover to work in the entertainment time period, so that the children can watch the television at the proper time, and the normal study and life of the children are prevented from being influenced by the enthusiasm of the television.

In the process of watching television programs by children, in order to achieve better protection of the mental health of the children, the content of the television programs watched by the children needs to be monitored. In one implementation, when the television is in the child mode, a content obtaining function of the viewing state functions is called and based on the content obtaining function. As shown in fig. 5, the invoking of the content obtaining function in the viewing state function and based on the content obtaining function includes the following steps:

s221, when the television is played in a child mode, calling a content acquisition function in the watching state function;

s222, acquiring the content played by the television based on the content acquisition function;

and S223, when the content being played does not belong to the child watching content, playing reminding is carried out so as to remind a user to adjust the playing content.

In one implementation, whether the currently played content belongs to the child viewing content may be determined by an image of the content being played by the television. Specifically, a content judgment device is preset in the television, and the content judgment device is connected with the processor. The television transmits the content of the program which is played currently to the content judgment device in a large screen capture mode in a real-time screen capture mode, the content judgment device transmits image information to the picture judgment model, and the picture judgment model judges whether the content of the program which is played currently is suitable or not. In one implementation, the content determination device is further provided with a text determination model, and when the content determination device obtains a screen shot of the current program content, text information is obtained from the screen shot and sent to the text determination model, and the text determination model determines whether the currently played program content is suitable according to a keyword comparison principle. And if the content of the program which is played currently is suitable, the television carries out inappropriate reminding on the played content so as to remind the user to adjust the played content. Whether the content of the program played currently is suitable or not is judged by the text method and the image method, so that the reliability and the accuracy of the content judgment result can be effectively improved.

In the process of watching television programs by children, in order to realize better protection on the physical health of the children, the sitting posture of the television programs watched by the children needs to be monitored. In one implementation, as shown in fig. 6, the invoking the viewing state function according to the child mode and playing a video based on the viewing state function includes the following steps:

s231, calling a sitting posture judgment function in the watching state function when the television is played in a child mode;

s232, acquiring the current sitting posture of the user according to the sitting posture judging function, and judging whether the current sitting posture judgment of the user is standard or not;

and S233, if the current sitting posture of the user is not standard, carrying out sitting posture reminding to remind the user to adjust the sitting posture.

Specifically, the processor in the television is connected with a first camera device through a local area network in advance, the first camera device is placed on the side of the child viewing position, for example, the child viewing position is on a sofa, and then the first camera device can be placed on a solid object on the left side or the right side of the sofa. The first photographing device starts to work after the television enters the child mode, the first photographing device shoots the side body image of the child in real time and transmits the image to the processor in real time, the processor judges whether the current sitting posture of the child meets the standard or not by analyzing the inclination of the body of the child in the image after obtaining the image, and when the sitting posture of the child is not standard, the television sends a sitting posture prompt to prompt a user to adjust the sitting posture. In one implementation, the top of the television is also provided with a second camera device, the second camera device is used for shooting a front image of a child viewing the image, and sending the front image to the processor in real time, the processor obtains the image and then judges whether the current viewing distance of the child meets the standard by analyzing the size value of the body shape of the child in the image, for example, when the child viewing distance is too short, the shot body shape of the child becomes larger along with the side of the short distance, that is, the size value of the shot body shape is inversely proportional to the distance from the child to the television, so that the size value of the body shape in the front image of the child viewing the image shot by the second camera device can be converted into the viewing distance by a specific conversion formula, when the child viewing distance is smaller than a preset distance threshold, the child viewing distance at this time is too short, and the television sends a distance prompt, to remind the user to adjust the distance. By monitoring the sitting posture and the watching distance of the watching children in real time, the watching children are reminded to keep a proper distance and watch the television in a correct posture, so that the children are far away from eye diseases and short and small television diseases.

In one implementation mode, after the television sends any one of a distance prompt, a sitting posture prompt and a content prompt, if it is not detected that the watching child makes a corresponding adjustment, the television continuously prompts and stops playing programs. For example, after the television sends the content reminder, if the user is not detected to change the program, the content reminder is continuously sent, and the playing of the current program is suspended until the user changes the channel, and then the watching of the program can be resumed. The reminding can be performed in a text mode, related texts are displayed in a full-screen display mode, the texts can be displayed in a bright-colored and large-font mode, so that children can clearly see the reminding, and incorrect film watching behaviors can be timely adjusted according to the reminding. In addition, the reminding can be converted into voice prompt so as to prevent children from being incapable of learning the reminding due to incomplete literacy and making adjustment in time.

In one implementation mode, when the watching is finished, in order to enable the children to quickly return to normal learning and life, when the television operates in the child mode, before the television is turned off, the screen of the television displays the subtitles to remind the children of watching the movie to finish, and in order to enable the children not to stay in the television program, the screen of the television only displays the subtitles to remind the children of watching the movie, and does not display pictures or animations.

In one implementation mode, the television is provided with a time judgment module for accurately limiting the watching duration of the children, and the time judgment module can guarantee that the television is accurate in travel time in the child mode. In an implementation manner, the time of the time judgment module may be adjusted according to a user requirement, and may be provided by a television or set by a user.

According to the method, a preset child mode is started according to an input operation instruction, and a plurality of watching state functions are set in the child mode; after the child mode is started, the watching state function is called, the television can play videos based on the watching state function, so that a television watching mode which accords with the characteristics of children is provided, and the problems that the child watching mode in the prior art is single in function and uninteresting are solved. The child mode can be suitable for children, and the user can also adapt the child mode to other people groups, such as specific patients, by changing relevant parameters in the child mode by himself. When the television is used, a user only needs to add a child mode in the existing television, and the operation is simple and rapid.

Exemplary device

As shown in fig. 7, an embodiment of the present invention provides a playback apparatus, including: a mode start unit 10 and a play control unit 20. Specifically, the mode starting unit is used for starting a preset child mode according to an input operation instruction, and the child mode is provided with a plurality of watching state functions. And the playing control unit is used for calling the watching state function according to the child mode and playing the video based on the watching state function.

Based on the above embodiments, the present invention further provides a television, and a schematic block diagram thereof may be as shown in fig. 8. The television comprises a processor, a memory, a network interface and a display screen which are connected through a system bus. Wherein the processor of the television is configured to provide computing and control capabilities. The memory of the television comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the television is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a playback control method. The display screen of the television can be a liquid crystal display screen or an electronic ink display screen.

It will be appreciated by those skilled in the art that the block diagram shown in fig. 8 is only a block diagram of a portion of the structure associated with the inventive arrangements and does not constitute a limitation on the television set to which the inventive arrangements are applied, and that a particular television set may include more or less components than those shown in the drawings, or may combine certain components, or have a different arrangement of components.

In one embodiment, a television set is provided comprising a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by one or more processors the one or more programs comprising instructions for:

starting a preset child mode according to an input operation instruction, wherein the child mode is provided with a plurality of watching state functions;

and calling the watching state function according to the child mode, and playing the video based on the watching state function.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

In summary, the present invention discloses a play control method, an apparatus, a storage medium and a television, wherein the method comprises: according to an input operation instruction, a preset child mode is started, a plurality of watching state functions are set in the child mode, the watching state functions are called according to the child mode, and video playing is carried out based on the watching state functions. The television watching mode which accords with the characteristics of children is provided, and the problems that the function of the child watching mode is single and uninteresting in the prior art are solved.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.