CN110798638A - Electronic whiteboard and picture storage and backtracking method based on time axis - Google Patents
Electronic whiteboard and picture storage and backtracking method based on time axis Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/70—Information retrieval; Database structures therefor; File system structures therefor of video data
- G06F16/71—Indexing; Data structures therefor; Storage structures
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/70—Information retrieval; Database structures therefor; File system structures therefor of video data
- G06F16/78—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually
- G06F16/783—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually using metadata automatically derived from the content
- G06F16/7844—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually using metadata automatically derived from the content using original textual content or text extracted from visual content or transcript of audio data
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/70—Information retrieval; Database structures therefor; File system structures therefor of video data
- G06F16/78—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually
- G06F16/7867—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually using information manually generated, e.g. tags, keywords, comments, title and artist information, manually generated time, location and usage information, user ratings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N5/9201—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal
- H04N5/9202—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal the additional signal being a sound signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/93—Regeneration of the television signal or of selected parts thereof
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Abstract
The invention discloses an electronic whiteboard and a method for storing and backtracking pictures based on a time axis, wherein the method for storing and backtracking the pictures comprises the following steps: generating a time stamp and a picture time axis by a time recording device; acquiring and recording pixel information of each pixel point of a current picture on the electronic whiteboard in real time; combining the pixel information of each pixel point into a frame of image information according to the time determined by the time granularity, adding the current time stamp to form a frame of image, and storing the frame of image in a memory; and retrieving the corresponding image according to the time stamp, acquiring the image information of the image and each frame image in front of or behind the image from the memory according to the sequence of the time stamp from the image, and acquiring a corresponding picture to be displayed on the electronic whiteboard by analyzing the image information. Compared with the prior art, the method provided by the invention saves the white board picture in a mode of adding a time stamp and recording the pixel change of the picture, reduces the storage space occupied by the file, and has the characteristic of backtracking.
Description
Technical Field
The invention relates to the technical field of office equipment, in particular to an electronic whiteboard and a picture storage and backtracking method based on a time axis.
Background
With the development of interactive whiteboards in meeting rooms, electronic whiteboard equipment based on a touch mode becomes important equipment in meeting rooms, can conveniently record and share blackboard-writing, and gradually replaces a physical whiteboard to become a standard configuration of modern offices. However, the conventional electronic whiteboard has the following problems:
(1) vector drawing elements are mostly adopted for storage in the existing electronic whiteboard, and when the existing vector drawing elements are locally erased, the problem of vector graph reconstruction is involved. When a plurality of complex vector elements are overlapped and erased collectively, the reconstruction of a vector graph is complex, the section change is obvious, and the user experience is poor.
(2) The existing electronic whiteboard adopting pixel storage has the problems that the picture cannot be traced back, the storage space is large and the like, and can not meet the use requirements of users on writing and erasing experience close to a real whiteboard.
In view of this, there is an urgent need to improve the existing electronic whiteboard to simplify the storage algorithm of the electronic whiteboard image, and to reconstruct the image quickly after erasing, thereby improving the user experience.
Disclosure of Invention
The invention aims to solve the technical problems that the existing electronic whiteboard has complex reconstruction after being erased, cannot backtrack pictures and has large storage space.
In order to solve the technical problem, the invention provides a picture storage method of an electronic whiteboard based on a time axis, which comprises the following steps:
generating a time stamp and a picture time axis through a time recording device, wherein the time stamp is the current time, and the picture time axis is a period of time recorded by the time recording device;
acquiring and recording pixel information of each pixel point of a current picture on the electronic whiteboard in real time, wherein the pixel information comprises position information and color information of the pixel point;
combining the pixel information of each pixel point into a frame of image information according to each moment determined by the time granularity, adding a current time stamp to form a frame of image, and storing the frame of image in a memory;
and selecting a time stamp for canceling or restoring the picture by using the picture time axis, retrieving the corresponding image from the memory according to the time stamp, acquiring the image and the image information of each frame of images in front of or behind the image from the memory according to the sequence of the time stamp from the image, and acquiring the corresponding picture to be displayed on the electronic whiteboard by analyzing the image information.
In the scheme, only the pixel information of each pixel point with the color different from that of the background is stored in the image information.
In the scheme, a picture is divided into a key frame and a difference frame according to picture properties, and for the key frame, only the pixel information of each first pixel point with a drawing position in the whole picture is recorded; and for the difference frame, recording the pixel information of a second pixel point which is different from the color information of each first pixel point in the current picture and the newly added pixel information of each third pixel point.
In this scheme, the screen timeline may be displayed on the electronic whiteboard, and the timestamp may be selected by dragging.
In the scheme, the background sound and the voice-aside in the writing process are stored in an audio mode, and the audio is converted into characters for storage through voice recognition.
In the scheme, the characters are stored in a recording mode of a picture time axis.
In the scheme, during the cancel or recovery operation, if the differential frame corresponding to the timestamp is empty, the forward or backward retrieval is continued until the differential frame corresponding to the timestamp is not empty.
In the scheme, the pictures stored in the cloud are edited, stored and shared by sharing the two-dimensional code.
The present invention also provides an electronic whiteboard, comprising:
the time recording device is used for generating a time stamp and a picture time axis, wherein the time stamp is the current time, and the picture time axis is a period of time recorded by the time recording device;
the recording device is used for acquiring and recording pixel information of each pixel point of a current picture on the electronic whiteboard in real time, wherein the pixel information comprises position information and color information of the pixel point;
the storage device combines the pixel information of each pixel point into a frame of image information according to each moment determined by the time granularity, adds the current time stamp to form a frame of image and stores the frame of image in the memory;
the canceling and recovering device selects the time stamp of canceling or recovering the picture by using the picture time axis, retrieves the corresponding image from the memory according to the time stamp, obtains the image and the image information of each frame image in front of or behind the image from the memory according to the sequence of the time stamp from the image, and obtains the corresponding picture to be displayed on the electronic whiteboard by analyzing the image information.
In the scheme, the storage device divides the picture into a key frame and a difference frame according to the picture property, and for the key frame, only the pixel information of each first pixel point with a drawing position in the whole picture is recorded; and for the difference frame, recording the pixel information of a second pixel point which is different from the color information of each first pixel point in the current picture and the newly added pixel information of each third pixel point.
Compared with the prior art, the electronic whiteboard and the picture storing and backtracking method based on the time axis provided by the scheme have the advantages that the time stamp and the picture time axis are generated by the time recording device and are in one-to-one correspondence with the images stored in the time stamp and the picture time axis, so that the picture backtracking is facilitated; through the recording device and the storage device, the pixel information of the first pixel point, the second pixel point and the third pixel point is obtained and recorded in real time, the size of a storage file during picture storage is reduced, the storage space is saved, the operation is convenient, and the use requirements of different users are met.
Drawings
Fig. 1 is a flowchart of a method for storing a picture of an electronic whiteboard based on a time axis according to the present invention;
FIG. 2 is a diagram illustrating a key frame storage method according to the present invention;
FIG. 3 is a diagram illustrating a method for storing a difference frame according to the present invention;
fig. 4 is a schematic diagram of an electronic whiteboard of the present invention.
Detailed Description
The invention provides an electronic whiteboard and a picture storage and backtracking method based on a time axis, wherein the writing process of the electronic whiteboard is stored based on the picture time axis, pictures can be backtracked, the reconstruction speed is high after erasure, online sharing and review can be carried out through a two-dimensional code, convenience and rapidness are realized, and the user experience degree is greatly improved. The invention is described in detail below with reference to the drawings and the detailed description.
The invention provides a method for storing and backtracking pictures based on a time axis, which adopts a picture storage method based on a picture time axis, takes a real picture time axis as a recording label, adds a time stamp on each frame of picture, and only records the pixel change of each frame of picture; and storing background sounds and voice-over in the writing process of the user in an audio mode, and performing character recording on the voice-over at the corresponding moment through a voice recognition engine to realize quick retrieval and positioning of the conference summary in a review mode.
As shown in fig. 1, the method for storing and backtracking pictures based on time axis provided by the present invention comprises the following steps:
s10, generating a time stamp and a screen time axis by the time recorder.
The time stamp is the current time, the picture time axis is a period of time recorded by the time recording device, and the picture time axis can be displayed on the electronic whiteboard and can be selected by dragging.
S20, when a whiteboard brush is used for writing on the electronic whiteboard or a whiteboard eraser is used for erasing on the electronic whiteboard, the position of a contact of the whiteboard brush, the color of the brush and the position of the whiteboard eraser are obtained in real time, and the color of a pixel point at the corresponding position on the electronic whiteboard is correspondingly changed according to the writing content or the erasing content;
s30, combining the information of each changed pixel point at each moment to form a frame of image information at the current moment according to the set time granularity, adding the current time stamp and storing the frame of image information in a memory;
due to the particularity of the white board picture, the whole white board picture is more of the same background color, and only the drawing part is changed due to the color filling of the painting brush. Therefore, the storage device only stores the pixel information of each pixel point with different background colors, the stored pixel information of each pixel point comprises the position information and the color information of the pixel point, and the recording form of the pixel point information is as follows:
{x,y,color}
where x represents a twelve-bit x coordinate, y represents a twelve-bit y coordinate, and color represents an eight-bit color value.
When the dynamic picture adopts the pixel storage mode, the occupied storage space is large, so that the picture data needs to be compressed and stored. In video coding and decoding, an I frame represents a key frame, and complete picture information is reserved; the P frame represents a difference frame, which represents the difference between the frame and the previous key frame or P frame, and the difference defined by the frame needs to be superimposed on the previously buffered picture during decoding to generate a final picture. As shown in fig. 2 and 3, according to the screen properties of the present application, the screen is divided into key frames and difference frames, the original document (new screen, finished document, document opened from memory, etc.) is called key frame, and the modification performed on the basis of the original document is called difference frame. For the key frame, only the pixel information of each first pixel point 11 of the drawing position is recorded; for the difference frame, the pixel information of the second pixel 12 different from the color information of each of the first pixels 11 and the pixel information of each of the newly added third pixels 13 are recorded.
As shown in fig. 2, for the key frame picture, only the information of each first pixel point 11 having a drawing position in the whole picture is recorded, so the key frame picture shown in fig. 2 is recorded as follows: {4,2,1}, {4,3,1}, …, {7,8,1 };
for the picture of the difference frame, as shown in fig. 3, compared to the key frame, there is a second pixel 12 different from the color information of the first pixel 11 and two newly added third pixels 13 in the current picture, so the record of the frame is: {4,4,2}, {6,4,2}, {7,8, FF }.
And S40, when the image canceling or restoring operation is carried out by using the image time axis, retrieving a corresponding frame of image from the memory according to the time stamp obtained from the image time axis, rolling back or advancing backwards from the memory according to the time stamp sequence from the frame of image to obtain the image information of each frame, and analyzing the image information to obtain the image to be displayed on the electronic whiteboard.
When the time axis is used for carrying out the operation of canceling or restoring the picture, a corresponding frame of image is retrieved from the memory according to the time stamp obtained from the time axis of the picture, and is rolled back or advanced backwards from the memory according to the sequence of the time stamp and the cancelled time granularity from the frame of image, and the difference frame corresponding to the time stamp is judged. If the difference frame is empty, the electronic whiteboard continues to search forwards along the time axis of the picture until the difference frame which is not empty is found, and the electronic whiteboard returns to the corresponding moment to analyze the image information to obtain the picture to be displayed on the electronic whiteboard.
For example, the timestamp obtained from the screen time axis is T1, the corresponding frame image is P1, the revoked time granularity is T seconds, the user performs the revocation operation, the electronic whiteboard rolls back along the screen time axis according to the order of the revoked time granularity T and the timestamps, and the corresponding frame image is P2, and the electronic whiteboard reaches the timestamp T2. And the electronic whiteboard judges the P2, judges that the P2 is empty, rolls back forwards along the picture time axis, reaches the previous frame of image P3 and judges, if the P3 is still empty, the picture time axis continues to roll back forwards until the latest frame of image Pm which is not empty is searched, analyzes the image information of the image Pm, and obtains a picture to be displayed on the electronic whiteboard.
The existing electronic whiteboard software adopts vector drawing elements for storage, but when the existing vector drawing elements are locally erased, the reconstruction algorithm of the related vector drawing elements is complex. However, the conventional pixel storage occupies a large storage space and cannot backtrack, so that the use requirement of a user cannot be met.
The method for storing and backtracking the picture based on the time axis effectively solves the problems that the existing white board is complex in reconstruction after being erased, the picture cannot be backtracked and the storage space is large, generates the time stamp and the picture time axis through the time recording device, and adds the time stamp into the image information at the corresponding moment for storage, so that the picture has the backtracking function. For the storage of the image picture, only the pixel information of each pixel point with different background colors in each frame of image picture is recorded, so that the number of the pixel points to be recorded is reduced; and for the key frame, only the pixel information of each first pixel point of the drawing position is recorded, and for the difference frame, only the pixel information of a second pixel point different from the color information of the first pixel point and the pixel information of each newly added third pixel point are recorded, so that the algorithm for storing the image information of the electronic whiteboard is simplified, the size of the stored file is further reduced, and the storage space is saved.
The present invention also provides an electronic whiteboard, comprising:
the time recording device is used for generating a time stamp and a picture time axis, wherein the time stamp is the current time, the picture time axis is a period of time recorded by the time recording device, and the time axis can be displayed on the electronic whiteboard and can be selected by dragging;
the recording device is used for acquiring and recording pixel information of each pixel point of a current picture on the electronic whiteboard in real time, wherein the pixel information comprises position information and color information of the pixel point;
the storage device combines the pixel information of each pixel point into a frame of image information according to each moment determined by the time granularity, adds the current time stamp to form a frame of image and stores the frame of image in the memory;
the canceling and recovering device selects the time stamp of canceling or recovering the picture by using the picture time axis, retrieves the corresponding image from the memory according to the time stamp, obtains the image and the image information of each frame image in front of or behind the image from the memory according to the sequence of the time stamp from the image, and obtains the corresponding picture to be displayed on the electronic whiteboard by analyzing the image information.
In the scheme, the electronic whiteboard stores the background sound and the voice-aside in the writing process in an audio mode, and converts the audio into characters for storage through voice recognition. The stored characters correspond to the time axis records of the pictures, so that a user can conveniently and quickly retrieve and position corresponding pictures and contents by the stored characters corresponding to the time axis and dragging the selected time stamp on the time axis of the pictures when reviewing the white board pictures.
In the scheme, a user can store the whiteboard of the current version, the stored whiteboard is shared to other users through the two-dimensional code link, the currently stored version can be browsed and edited through the two-dimensional code link, the whiteboard can be rapidly stored and exported according to the needed format of the user, for example, the user needs a video file, and after the user edits the whiteboard, the user can select to store the electronic whiteboard into the video file in the mp4 format and store the electronic whiteboard in the cloud or export the electronic whiteboard into the local storage.
As shown in fig. 4, the electronic whiteboard is used as follows:
when a user starts the whiteboard, the time recording device of the electronic whiteboard starts to generate a timestamp and a picture time axis, and meanwhile, background recording and voice recognition conversion text storage are started. The electronic whiteboard can record conference background sound continuously and store the conference background sound in an mp3 format, when a person speaks, the speech is converted into text content through the speech recognition engine, and the text content is stored and recorded continuously according to sentences as follows:
conference 2019-08-0815: 05
Begin
May be 0:00:00
0:00: 02I list the main issues
0:00:05 first
0:00:05 review sales performance for the next quarter
0:00:15, etc
……
When a user selects a painting tool to start writing on a board, the recording device acquires and records the pixel information of each pixel point of a current picture on the electronic whiteboard in real time, and the storage device starts to synthesize the pixel information of each pixel point into a frame of image picture at each moment determined according to the time granularity, adds a time stamp to form a frame of image and stores the frame of image in the memory. In the preferred embodiment, we set 500 ms to 1 time granularity, i.e. 2 frames of pictures are recorded per second, and the storage device will record the current picture every 500 ms with the user's blackboard writing. The time granularity of the key frame is set to 10 seconds, namely every 10 seconds, a complete blackboard-writing picture is stored, and the picture is compressed by a compression method during storage, and only effective data are stored:
imagedata：
0:00:00:000 00
0:00:10:000 00
0:00:10:500 00400201 00400301 00300402
00500402……00700801
0:00:13:500 00400402 00600402 007008ff
0:00:20:000 00400201 00400301 00300402 00400402
00600402 007008ff……00700801
0:00:30:000 00400201 00400301 00300402 00400402
00600402 007008ff……00700801
when a user needs to cancel or restore operation, the cancellation and restoration device retrieves a corresponding image from the memory according to the timestamp and the cancelled time granularity, retrieves an image Pm of which the latest frame is not empty, analyzes the image information of the image Pm, and obtains a picture to display on the electronic whiteboard. 1 second is the time granularity set for revocation in the preferred embodiment.
After the editing is completed, the user can save the edited whiteboard. The user can save the whiteboard file edited to the high in the clouds, and the user can share the whiteboard of saving for other users through the two-dimensional code link, browses and edits the version of current saving, also can carry out fast storage and export to the whiteboard according to user's needs format.
Compared with the prior art, the electronic whiteboard and the picture storage and backtracking method based on the time axis have the following advantages:
(1) the time stamp and the picture time axis are generated by the time recording device and are in one-to-one correspondence with the stored images, so that backtracking can be realized;
(2) only the pixel information of each pixel point with different background colors is stored during recording, so that a more simplified compression storage algorithm is realized, the storage size of the whiteboard file is reduced, and the storage space is saved;
(3) storing background sound and voice-over in the writing process in an audio mode, converting the audio into characters through voice recognition and storing the characters, and facilitating the retrieval and positioning of users during the arrangement and review of meeting president;
(4) through sharing the two-dimensional code, the picture stored in the cloud is edited, stored and shared, the operation is convenient, and the use requirements of different users are met.
The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
Claims (10)
1. A picture storage method of an electronic whiteboard based on a time axis is characterized by comprising the following steps:
generating a time stamp and a picture time axis through a time recording device, wherein the time stamp is the current time, and the picture time axis is a period of time recorded by the time recording device;
acquiring and recording pixel information of each pixel point of a current picture on the electronic whiteboard in real time, wherein the pixel information comprises position information and color information of the pixel point;
combining the pixel information of each pixel point into a frame of image information according to each moment determined by the time granularity, adding a current time stamp to form a frame of image, and storing the frame of image in a memory;
and selecting a time stamp for canceling or restoring the picture by using the picture time axis, retrieving the corresponding image from the memory according to the time stamp, acquiring the image and the image information of each frame of images in front of or behind the image from the memory according to the sequence of the time stamp from the image, and acquiring the corresponding picture to be displayed on the electronic whiteboard by analyzing the image information.
2. The method according to claim 1, wherein only pixel information of each pixel point with a color different from a background color is stored in the image information.
3. The method according to claim 1, characterized in that a picture is divided into a key frame and a difference frame according to picture properties, and for the key frame, only pixel information of each first pixel point of a drawing position is recorded; and for the difference frame, recording the pixel information of a second pixel point different from the color information of each first pixel point and the newly added pixel information of each third pixel point.
4. The method according to claim 1, wherein the picture timeline can be displayed on an electronic whiteboard and the timestamps can be selected by dragging.
5. The method of claim 1, wherein the background sound and the voice-over during writing are stored in an audio manner, and the audio is converted into characters for storage through voice recognition.
6. The method according to claim 5, wherein the text is stored in a recording manner of a picture time axis.
7. The method of claim 3, wherein upon a revocation or a resumption operation, if the differential frame corresponding to the timestamp is empty, then continuing to retrieve forward or backward until the differential frame corresponding to the timestamp is not empty.
8. The method according to claim 1, wherein the pictures stored in the cloud are edited, stored and shared by sharing the two-dimensional code.
9. An electronic whiteboard, comprising:
the time recording device is used for generating a time stamp and a picture time axis, wherein the time stamp is the current time, and the picture time axis is a period of time recorded by the time recording device;
the recording device is used for acquiring and recording pixel information of each pixel point of a current picture on the electronic whiteboard in real time, wherein the pixel information comprises position information and color information of the pixel point;
the storage device combines the pixel information of each pixel point into a frame of image information according to each moment determined by the time granularity, adds the current time stamp to form a frame of image and stores the frame of image in the memory;
the canceling and recovering device selects the time stamp of canceling or recovering the picture by using the picture time axis, retrieves the corresponding image from the memory according to the time stamp, obtains the image and the image information of each frame image in front of or behind the image from the memory according to the sequence of the time stamp from the image, and obtains the corresponding picture to be displayed on the electronic whiteboard by analyzing the image information.
10. The method according to claim 9, wherein the storage device divides the frame into a key frame and a difference frame according to the frame property, and for the key frame, only the pixel information of each first pixel point having a drawing position in the whole frame is recorded; and for the difference frame, recording the pixel information of a second pixel point which is different from the color information of each first pixel point in the current picture and the newly added pixel information of each third pixel point.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111314628A (en) * | 2020-03-17 | 2020-06-19 | 北京文香信息技术有限公司 | Method and device for converting infrared track into video stream, electronic whiteboard and storage medium |
| CN111459593A (en) * | 2020-03-31 | 2020-07-28 | 杭州海康威视数字技术股份有限公司 | Drawing method, device and equipment |
| CN111966279A (en) * | 2020-07-28 | 2020-11-20 | 锐达互动科技股份有限公司 | Method, device, equipment and medium for sharing blackboard writing |
| CN113138700A (en) * | 2021-04-23 | 2021-07-20 | 深圳市闪联信息技术有限公司 | Interactive electronic whiteboard with nonlinear revocation function and nonlinear revocation method thereof |
| CN114900641A (en) * | 2022-04-29 | 2022-08-12 | 安徽听见科技有限公司 | Data storage and backtracking method, device and system |
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