CN111290659A - Writing board information recording method and system and writing board - Google Patents
Writing board information recording method and system and writing board Download PDFInfo
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Abstract
The invention discloses a writing board information recording method, a system and a writing board, comprising the following steps: acquiring a writing image in a writing board area shot by a camera device; comparing the variable quantity of the writing image of the previous frame with the variable quantity of the writing image of the next frame; determining the writing image with the variable quantity exceeding a preset threshold value as a key frame image; and storing or transmitting the key frame image under a preset trigger condition. According to the writing board information recording method, the writing board information recording system and the writing board, key contents of the writing board are automatically stored by identifying the key frame images, and storage or sending of the key frame images is triggered through the specified trigger conditions, so that the control is more sensitive and accurate, and the sharing and storage of the writing board contents are facilitated.
Description
Technical Field
The invention relates to the technical field related to writing on a blackboard, in particular to a writing board information recording method and system and a writing board.
Background
The demonstration board under traditional office or conference system or the blackboard that school teaching was used are mostly the clipboard that only has simple writing function, there is certain use limitation, current technique includes Crestrong air Board, Captivo etc., it is the meeting room system mainly to the scene, it is not enough to see the sense of sight (the long-range visitor is not clear) or information look over (shoot through cell-phone or computer camera) etc. to the meeting room clipboard information, catch the clipboard information and share for long-range or local participant through the camera, or throw the catch information in real time on meeting room central display screen or projection screen, be convenient for transmission and the interchange of meeting information.
The prior art has the disadvantages that the sharing information of the writing board needs to be selected actively by a host, the situation that the sharing is forgotten to be selected may occur, and the key writing board information may be missed.
Disclosure of Invention
The invention aims to provide a writing board information recording method, a writing board information recording system and a writing board, wherein the writing board information recording method, the writing board information recording system and the writing board can automatically store key contents of the writing board and are convenient to share and store.
In order to solve the above technical problem, the present invention provides a writing board information recording method, including:
acquiring a writing image in a writing board area shot by a shooting device;
comparing the variable quantity of the writing image of the previous frame with the variable quantity of the writing image of the next frame;
determining the writing image with the variable quantity exceeding a preset threshold value as a key frame image;
and storing or transmitting the key frame image under a preset trigger condition.
Optionally, the determining, as a key frame image, a writing image of which the variation exceeds a preset threshold includes:
and erasing the writing content of the writing board, and determining the closest writing image before the erasing action as a key frame image if the variable quantity exceeds a preset threshold value.
Optionally, the erasing the writing content of the writing board, and if the variation exceeds a preset threshold, determining that the closest writing image before the erasing action is the key frame image, including:
and reserving the key frame image within a preset time limit, and deleting the key frame image beyond the preset time limit.
Optionally, the determining, as a key frame image, a writing image of which the variation exceeds a preset threshold includes:
and determining the writing image with the variable quantity exceeding a preset threshold value as a key frame image, comparing the key frame images, and deleting the previous key frame image if the writing content included in the previous key frame image can be completely contained in the later key frame image.
Optionally, the preset trigger condition includes:
recognizing a preset triggering voice keyword, receiving a triggering instruction for a preset button, recognizing a preset specified gesture or recognizing a preset specified graph triggering action;
the storing or sending the key frame image under the preset trigger condition comprises:
recognizing a preset trigger voice keyword, and storing or sending a key frame image at the moment corresponding to the trigger voice keyword;
or receiving a trigger instruction of a preset button, and storing or sending a key frame image at a moment corresponding to the key trigger instruction;
or recognizing a preset appointed gesture, and storing or sending a key frame image at the moment corresponding to the appointed gesture;
or recognizing a preset specified graph triggering action, and storing or sending the key frame image at the moment corresponding to the specified graph triggering action.
Optionally, after acquiring the writing image in the writing board area shot by the shooting device, the method further includes:
and carrying out distortion correction, perspective correction and splicing on the writing image to generate a front visual angle image of the writing board area.
Optionally, after acquiring the writing image in the writing board area shot by the shooting device, the method further includes:
and carrying out image processing on the writing image, and extracting and storing the handwriting content in the writing image.
Optionally, after the writing image in the writing board region photographed by the photographing device is to be acquired, the method further includes:
and performing visual enhancement processing on the writing image, and highlighting the handwriting content in the writing image.
The present invention also provides a writing board information recording system, comprising:
the acquisition module is used for acquiring a writing image in the writing board area shot by the shooting device;
the comparison module is used for comparing the variation of the written image of the previous frame with the variation of the written image of the next frame;
the key frame module is used for determining the writing image with the variable quantity exceeding a preset threshold value as a key frame image;
and the trigger module is used for storing or sending the key frame image under a preset trigger condition.
The present invention also provides a writing board comprising:
a memory for storing a computer program;
a processor for implementing the writing tablet information recording method according to any one of the above when the computer program is executed.
According to the writing board information recording method, the writing board information recording system and the writing board, key contents of the writing board are automatically stored by identifying the key frame images, and storage or sending of the key frame images is triggered through the specified trigger conditions, so that the control is more sensitive and accurate, and the sharing and storage of the writing board contents are facilitated.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a writing tablet information recording method in an embodiment of the present invention;
FIG. 2 is a flowchart of key frame image determination of a writing tablet information recording method according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a key frame image overlay method for writing tablet information recording according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating preset conditions of a writing tablet information recording method according to an embodiment of the present invention;
FIG. 5 is a flowchart of image transformation of a writing tablet information recording method according to an embodiment of the present invention;
FIG. 6 is a flow chart of handwriting extraction of the writing tablet information recording method in the embodiment of the present invention;
FIG. 7 is a flow chart illustrating a method for recording tablet information according to an embodiment of the present invention;
FIG. 8 is a block diagram showing the structure of a writing tablet information recording system according to an embodiment of the present invention;
fig. 9 is a block diagram of the structure of the tablet in the embodiment of the present invention.
Detailed Description
The core of the invention is to provide a writing board information recording method, a writing board information recording system and a writing board, wherein the writing board information recording method, the writing board information recording system and the writing board can automatically store key contents of the writing board and are convenient to share and store.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
The invention provides a writing board information recording method, as shown in figure 1, comprising:
s100: and acquiring a writing image in the writing board area shot by the shooting device.
Specifically, the photographing device may be a video camera, a still camera, or the like, which is capable of recording and photographing. When the photographing device is a camera, the camera photographs a video stream, and a picture is intercepted from the video stream to be used as a writing image containing writing information; when the photographing device is a camera, the camera can take pictures in different working modes, and the pictures are written images containing written information.
S300: and comparing the variation of the written image of the previous frame with the variation of the written image of the next frame.
Specifically, whether the photographing device is a video camera or a still camera, the photographed writing image is a plurality of writing images, and the variation amount of the previous frame and the next frame in the writing image is compared.
S500: and determining the writing image with the variable quantity exceeding a preset threshold value as a key frame image.
Specifically, a preset threshold is set for the writing image variation, the preset threshold can be adjusted according to specific application conditions, if more key frame images are desired to be retained, the preset threshold is smaller, and if less key frame images are desired to be retained, the preset threshold can be set larger, and factors such as the memory and the service time of the photographing device need to be considered.
S700: and storing or transmitting the key frame image under a preset trigger condition.
Specifically, a preset trigger condition is identified, a key frame image storage or sending action is triggered, the preset trigger condition can be selected according to a specific application scene, if a trigger wishes to store the key frame image at the time corresponding to the preset action, the photographing device or a connected storage device can directly store the key frame image at the corresponding time, and if the trigger wishes to send the key frame image at the time corresponding to the preset action, the photographing device or a connected sending device can request a corresponding sharing application program interface to send the key frame image.
According to the writing board information recording method provided by the embodiment, the key content of the writing board is automatically stored by identifying the key frame image, and the storage or the sending of the key frame image is triggered by the appointed trigger condition, so that the control is more sensitive and accurate, and the sharing and the storage of the writing board content are convenient.
Alternatively, as shown in fig. 2, step S500 includes:
s510: and erasing the writing content of the writing board, and determining the closest writing image before the erasing action as a key frame image if the variable quantity exceeds a preset threshold value.
Specifically, the erased variation of the writing content of the writing board usually exceeds the preset threshold, so the writing images before and after the erasing action are the key frame images, and the images before the erasing action generally have reference and recording values, so the writing board information recording method of the embodiment determines the closest image before the erasing action as the key frame image.
Specifically, in practical applications, a situation may occur in which the operator forgets to save or send the key frame image before the erasing action, and in such a situation, the writing board information recording method of the present embodiment may automatically save the backup.
The writing board information recording method of the embodiment is more specific and practical for the key frame image determination process in the erasing action.
Optionally, as shown in fig. 2, after S510 in step S500, the method further includes:
s520: and reserving the key frame image within a preset time limit, and deleting the key frame image beyond the preset time limit.
Specifically, since the memory of the shooting device or the connected storage device is limited, it is necessary to reduce unnecessary memory as much as possible, and the key frame image is automatically stored in the erasing operation, and the main purpose of the method is to automatically save the backup if the operator forgets to save or send the key frame image before the erasing operation. In practical application, if the key frame images need to be stored, the operator can generally reflect the key frame images in time after misoperation, or the key frame images before being erased do not need to be stored under partial conditions, so that the automatically stored key frame images can set a retention time limit, and if the retention time limit exceeds the preset time limit, the corresponding key frame images can be deleted, so that the memory is saved and the key frame images are simplified.
The writing board information recording method of the embodiment is more specific and practical for the key frame image retention process in the erasing action.
Alternatively, as shown in fig. 3, step S500 includes:
s500 a: and determining the writing image with the variable quantity exceeding a preset threshold value as a key frame image, comparing the key frame images, and deleting the previous key frame image if the writing content included in the previous key frame image can be completely contained in the later key frame image.
Specifically, since the storage of the key frame images is a continuous process, on the premise of a preset threshold, the subsequent key frame images may still completely contain the written content of the previous key frame images, and in this case, the previous key frame images may be deleted, so as to save memory and reduce the key frame images.
The writing board information recording method of the embodiment is more specific and practical for the retention and automatic deletion process of the key frame image.
Optionally, the preset trigger condition includes:
recognizing a preset triggering voice keyword, receiving a triggering instruction for a preset button, recognizing a preset appointed gesture or recognizing a preset appointed graph triggering action.
Specifically, the preset trigger condition may be set according to a specific application scenario.
As shown in fig. 4, step S700 includes:
s710: and recognizing a preset trigger voice keyword, and storing or sending a key frame image at the moment corresponding to the trigger voice keyword.
Specifically, when the preset trigger condition is a voice keyword, a microphone and a voice control device should be arranged on the corresponding photographing device, and when the preset voice keyword is recognized, a storage or transmission mechanism is started for a key frame image at the corresponding moment.
Or S720: and receiving a trigger instruction of a preset button, and storing or sending the key frame image at the moment corresponding to the key trigger instruction.
Specifically, when the preset trigger condition is a trigger instruction of a button, the corresponding photographing device should be provided with the button and a button control device, and when the button trigger instruction is recognized, a storage or transmission mechanism is started for the key frame image at the corresponding moment.
Or S730: and recognizing a preset appointed gesture, and storing or sending the key frame image at the moment corresponding to the appointed gesture.
Specifically, when the preset trigger condition is a designated gesture, a gesture recognition device and a gesture control device should be arranged on the corresponding photographing device, and when the designated gesture is recognized, a storage or transmission mechanism is started for the key frame image at the corresponding moment.
Or S740: and recognizing a preset specified graphic trigger action, and storing or sending the key frame image at the moment corresponding to the specified graphic trigger action.
Specifically, when the preset trigger condition is a specified graphic trigger action, a graphic recognition device and a graphic control device are arranged on the corresponding photographing device, and when the specified graphic trigger action is recognized, a storage or transmission mechanism is started for the key frame image at the corresponding moment.
The writing board information recording method of the present embodiment further refines the above-mentioned embodiment, and S710, S720, S730, and S740 are not steps performed sequentially, but are selectively performed according to the implementation of preset conditions. The recognition steps detailed in the above embodiments are added to the recording method, so that the writing board information recording method of the present embodiment is more specific and practical.
The writing board information recording method of the embodiment is more specific and practical for the preset trigger condition.
Optionally, as shown in fig. 5, after step S100, the method further includes:
s200: and carrying out distortion correction, perspective correction and splicing on the writing image to generate a front visual angle image of the writing board area.
Specifically, in order to obtain a more complete picture and more written information, the photographing apparatus generally uses a wide-angle or ultra-wide-angle photographing apparatus that can perform a photographing action. The wide-angle camera or the super-wide-angle camera is adopted as the photographing device of the embodiment, the video and the picture shot by the wide-angle camera and the super-wide-angle camera have serious distortion, the information of the video and the picture is difficult to directly identify by human eyes, the photographing device is generally arranged on the side of the writing board, the photographing device cannot be too far away from the writing board even if arranged at the middle position, the shot visual angle is usually inclined in order to obtain a larger shooting area, and the human eyes which are directly used have poor reading feeling. Therefore, a series of operations such as distortion correction, perspective correction, and stitching are required to be performed on the written image, and the written image is converted into a commonly-used frontal perspective view.
More specifically, the distortion correction is to solve the distortion problem of the writing image of the photographing device, and the writing image is subjected to distortion correction through a correction matrix to obtain a corrected writing image. The method for determining the correction matrix comprises the following steps: shooting a standard calibration board through a shooting device to obtain a plurality of pictures, wherein the standard calibration board is provided with a preset angular point; determining angular points in the shot picture through an algorithm; and calculating to obtain a correction matrix of the lens according to the positions of the angular points in the plurality of pictures and the position of the preset angular point on the actual standard calibration plate. The written image obtained after the distortion correction basically conforms to the visual habits of people, and the content in the written image is convenient for people to read.
More specifically, the perspective transformation is to change the shooting angle of view of the written image to solve the problem of the angle inclination of the photographing device, so that the shooting angle of view of each frame of the written image exhibits the effect of frontal shooting. The perspective transformation is projective transformation for changing center projection, and is planar fractional linear transformation when expressed by non-homogeneous projective coordinates. Perspective transformation is also an operation of changing the size and shape of an object, and a planar graph can generate a stereoscopic effect after perspective transformation. When the object is subjected to perspective transformation, the four corners of the limiting frame are not necessarily limited in the side length direction of the object, and the four corners can also move, so that a more complex perspective transformation effect is obtained, and the method is mainly used for changing the shooting angle of a picture. The writing image obtained after perspective transformation is more suitable for the viewing habit of people, and the content in the writing image can be conveniently read by people.
Specifically, when more than one photographing device is used, pictures at multiple viewing angles at the same time need to be spliced into a complete writing image in the writing board area.
The writing board information recording method of the embodiment is more specific and practical for the processing process of the writing image before sending.
Optionally, as shown in fig. 6, after step S100, the method further includes:
s200': and carrying out image processing on the writing image, and extracting and storing the handwriting content in the writing image.
Specifically, according to the difference between the color of the handwriting and the color of the background, an image processing technology is adopted for distinguishing, and the content belonging to the color of the handwriting is extracted. The handwriting content in the writing image of the embodiment is extracted and stored based on color processing, so that the background color of the writing board is not required, and the writing can be realized as long as the handwriting is a single color different from the background color.
The writing board information recording method of the embodiment is more specific and practical for the processing process of the writing image before sending.
Optionally, as shown in fig. 7, after step S100, the method further includes:
s200': and performing visual enhancement processing on the writing image, and highlighting the handwriting content in the writing image.
Specifically, according to the difference between the color of the handwriting and the color of the background, an image processing technology is adopted for distinguishing, and the content belonging to the handwriting color is enhanced. Visual enhancement generally improves the interpretation effect by highlighting differences in color, brightness, etc. of the image. The color contrast of the background of the color enhancement picture and the handwriting is used in the embodiment, so that the handwriting on the writing board is more prominent, the effect of highlighting the effective information on the writing board can be achieved, and the recognition degree of the person on the writing content on the writing board is improved.
The writing board information recording method of the embodiment is more specific and practical for the processing process of the writing image before sending.
The writing board information recording method of the embodiment further refines the processing process of the writing image, and S200, S200', and S200 ″ are not steps executed sequentially, but are selectively executed according to the processing requirements of the specific application scene on the picture, and may be executed at any step after the writing image is acquired and before the key frame image is sent, or may be executed on the whole writing image, or may be set to be executed only on the determined key frame image, and the execution mode adapts to the specific application scene.
The present invention also provides a writing board information recording system, as shown in fig. 8, comprising:
and the acquisition module 10 is used for acquiring the writing image in the writing board area shot by the shooting device.
And a comparison module 20, configured to compare variation of the written image between a previous frame and a next frame.
And a key frame module 30, configured to determine the writing image with the variation exceeding a preset threshold as a key frame image.
And the triggering module 40 is configured to store or send the key frame image under a preset triggering condition.
Optionally, the key frame module 30 includes:
and the erasing key frame submodule is used for erasing the writing content of the writing board, and if the variable quantity exceeds a preset threshold value, the closest writing image before the erasing action is determined as a key frame image.
Optionally, the key frame module 30 further includes:
and the time-limited retention submodule is used for retaining the key frame image within a preset time limit and deleting the key frame image beyond the preset time limit.
Optionally, the key frame module 30 further includes:
and the key frame covering sub-module is used for determining the writing image with the variation exceeding a preset threshold value as a key frame image, comparing the key frame image, and deleting the previous key frame image if the writing content included in the previous key frame image can be completely contained in the later key frame image.
Optionally, the preset trigger condition includes:
recognizing a preset triggering voice keyword, receiving a triggering instruction for a preset button, recognizing a preset appointed gesture or recognizing a preset appointed graph triggering action.
The triggering module 40 includes:
and the voice triggering sub-module is used for identifying a preset triggering voice keyword and storing or sending a key frame image at the moment corresponding to the triggering voice keyword.
And the button triggering submodule is used for receiving a triggering instruction of a preset button and storing or sending the key frame image at the moment corresponding to the button triggering instruction.
And the gesture triggering submodule is used for identifying a preset appointed gesture and storing or sending the key frame image at the moment corresponding to the appointed gesture.
And the pattern triggering submodule is used for identifying a preset specified pattern triggering action and storing or sending the key frame image at the moment corresponding to the specified pattern triggering action.
Optionally, the writing tablet information recording system further comprises:
and the picture processing module is used for carrying out distortion correction, perspective correction and splicing on the key frame image to generate a front visual angle image of the writing board area.
Optionally, the writing tablet information recording system further comprises:
and the handwriting extraction module is used for carrying out image processing on the key frame image and extracting and storing handwriting content in the key frame image.
Optionally, the writing tablet information recording system further comprises:
and the visual enhancement module is used for carrying out visual enhancement processing on the key frame image and highlighting the handwriting content in the key frame image.
The writing board information recording system of this embodiment is used to implement the writing board information recording method, and therefore the specific implementation manner in the recording system can be seen in the embodiment parts of the recording method in the foregoing, for example, the obtaining module 10, the comparing module 20, the key frame module 30, and the triggering module 40 are respectively used to implement steps S100, S300, S500, and S700 in the recording method, so that the specific implementation manner thereof may refer to the description of the corresponding embodiments of each part, and is not described herein again.
The writing board information recording system provided by the embodiment can record writing board information, automatically stores key content of the writing board by identifying the key frame image, and triggers the storage or sending of the key frame image through a specified trigger condition, so that the control is more sensitive and accurate, and the writing board content is conveniently shared and stored.
The present invention also provides a writing board, as shown in fig. 9, comprising:
a memory 1 for storing a computer program.
A processor 2 for implementing the writing tablet information recording method according to any one of the above when executing the computer program.
The memory 1 includes at least one type of readable storage medium, which includes a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, and the like. The memory 1 may in some embodiments be an internal storage unit of the tablet information recording system, such as a hard disk. The memory 1 may also be an external storage device of the tablet information recording system in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 1 may also include both an internal storage unit of the tablet information recording system and an external storage device. The memory 1 can be used not only for storing application software installed in the tablet information recording system and various types of data such as codes of the tablet information recording program, etc., but also for temporarily storing data that has been output or is to be output.
The processor 2 may be a Central Processing Unit (CPU), controller, microcontroller, microprocessor or other data Processing chip in some embodiments, and is used for executing program codes stored in the memory 1 or Processing data, such as executing a tablet information recording program.
The writing board provided by the embodiment can automatically store the key frame images, and the storage or the sending of the key frame images are triggered through the specified trigger conditions, so that the control is more sensitive and accurate, and the sharing and the storage of the writing board contents are convenient.
According to the writing board information recording method, the writing board information recording system and the writing board, key content of the writing board is automatically stored by identifying the key frame image, and storage or sending of the key frame image is triggered by the appointed trigger condition, so that the control is more sensitive and accurate, the sharing and storage of the writing board content are facilitated, the key frame image can be determined by setting a preset threshold value for the variable quantity of the writing board content, the key frame image with more practical value is determined for the storage setting time limit of the key frame image, and the storage space and the sending flow can be saved. The invention can provide high-quality key frame images through a series of operations such as distortion correction, perspective correction and splicing of the written images.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The method, system and writing board for writing board information recording provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A writing board information recording method, comprising:
acquiring a writing image in a writing board area shot by a shooting device;
comparing the variable quantity of the writing image of the previous frame with the variable quantity of the writing image of the next frame;
determining the writing image with the variable quantity exceeding a preset threshold value as a key frame image;
and storing or transmitting the key frame image under a preset trigger condition.
2. The writing board information recording method according to claim 1, wherein the determining of the writing image whose variation exceeds a preset threshold as the key frame image comprises:
and erasing the writing content of the writing board, and determining the closest writing image before the erasing action as a key frame image if the variable quantity exceeds a preset threshold value.
3. The writing board information recording method according to claim 2, wherein the writing contents of the writing board are erased, and if the variation exceeds a preset threshold, the closest written image before the erasing action is determined as the key frame image, and the method comprises:
and reserving the key frame image within a preset time limit, and deleting the key frame image beyond the preset time limit.
4. The writing board information recording method according to claim 1, wherein the determining of the writing image whose variation exceeds a preset threshold as the key frame image comprises:
and determining the writing image with the variable quantity exceeding a preset threshold value as a key frame image, comparing the key frame images, and deleting the previous key frame image if the writing content included in the previous key frame image can be completely contained in the later key frame image.
5. The writing board information recording method according to claim 1, wherein the preset trigger condition includes:
recognizing a preset triggering voice keyword, receiving a triggering instruction for a preset button, recognizing a preset specified gesture or recognizing a preset specified graph triggering action;
the storing or sending the key frame image under the preset trigger condition comprises:
recognizing a preset trigger voice keyword, and storing or sending a key frame image at the moment corresponding to the trigger voice keyword;
or receiving a trigger instruction of a preset button, and storing or sending a key frame image at a moment corresponding to the key trigger instruction;
or recognizing a preset appointed gesture, and storing or sending a key frame image at the moment corresponding to the appointed gesture;
or recognizing a preset specified graph triggering action, and storing or sending the key frame image at the moment corresponding to the specified graph triggering action.
6. The writing board information recording method according to claim 1, wherein after acquiring the writing image in the writing board area photographed by the photographing device, further comprising:
and carrying out distortion correction, perspective correction and splicing on the writing image to generate a front visual angle image of the writing board area.
7. The writing board information recording method according to claim 1, wherein after acquiring the writing image in the writing board area photographed by the photographing device, further comprising:
and carrying out image processing on the writing image, and extracting and storing the handwriting content in the writing image.
8. The writing board information recording method according to claim 1, wherein after acquiring the writing image in the writing board area photographed by the photographing device, further comprising:
and performing visual enhancement processing on the writing image, and highlighting the handwriting content in the writing image.
9. A writing board information recording system, comprising:
the acquisition module is used for acquiring a writing image in the writing board area shot by the shooting device;
the comparison module is used for comparing the variation of the written image of the previous frame with the variation of the written image of the next frame;
the key frame module is used for determining the writing image with the variable quantity exceeding a preset threshold value as a key frame image;
and the trigger module is used for storing or sending the key frame image under a preset trigger condition.
10. A writing board, comprising:
a memory for storing a computer program;
a processor for implementing the tablet information recording method according to any one of claims 1 to 8 when executing the computer program.
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