WO2019033665A1 - 一种板书过程的记录方法、装置、设备和存储介质 - Google Patents

一种板书过程的记录方法、装置、设备和存储介质 Download PDF

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Publication number
WO2019033665A1
WO2019033665A1 PCT/CN2017/116774 CN2017116774W WO2019033665A1 WO 2019033665 A1 WO2019033665 A1 WO 2019033665A1 CN 2017116774 W CN2017116774 W CN 2017116774W WO 2019033665 A1 WO2019033665 A1 WO 2019033665A1
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blackboard
image
board
voice information
time axis
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English (en)
French (fr)
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王东杰
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
Guangzhou Shirui Electronics Co Ltd
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
Guangzhou Shirui Electronics Co Ltd
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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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/10—Services
    • G06Q50/20—Education

Definitions

  • Embodiments of the present invention relate to an e-learning technology, and in particular, to a recording method, apparatus, device, and storage medium for a blackboard book process.
  • Online education is a product of the Internet age. It is a new type of field. Because it is not limited by time and region, more and more people learn through online courses.
  • the invention provides a recording method, device, device and storage medium for a blackboard book process, so as to reduce the amount of data of the teaching video and the memory occupied by the video file.
  • an embodiment of the present invention provides a method for recording a blackboard book process, including:
  • the voice information and the blackboard image are saved based on the time axis association to generate a blackboard book recording file in which the voice information and the blackboard image are continuously output based on the time axis during playback.
  • the embodiment of the present invention further provides a recording device for a blackboard book process, including:
  • the collecting module is configured to collect voice information during the board writing process, and collect and save the board image of the writing board based on the preset period;
  • mapping module configured to map an acquisition moment of the blackboard image to a time axis of the voice information
  • a generating module configured to save the voice information and the blackboard image based on the time axis association to generate a blackboard book recording file that continuously outputs the voice information and the blackboard image based on the time axis during playback.
  • an embodiment of the present invention further provides an apparatus, including:
  • One or more processors are One or more processors;
  • a memory for storing one or more programs
  • the one or more programs are executed by the one or more processors such that the one or more processors implement the recording method of the tablet book process described above.
  • an embodiment of the present invention further provides a computer readable storage medium, which is implemented by a processor to implement the recording method of the board book process described above.
  • the invention collects and saves a blackboard image of the writing board based on the voice information in the board book process; and maps the collection time of the board image to the time axis of the voice information; and saves the time based on the time axis
  • the voice information and the blackboard image generation board record file when the board book record file is opened, continuously outputting the voice information and the board image based on the time axis, thereby solving the problem that the data amount of the network course is too large, and achieving the reduction
  • the memory usage of online course video files are examples of the memory usage of online course video files.
  • FIG. 1 is a flow chart showing a recording method of a blackboard book process in the first embodiment of the present invention.
  • FIG. 2 is a flow chart of a recording method of a blackboard book process in the second embodiment of the present invention.
  • Embodiment 3 is a schematic structural view of a recording apparatus of a blackboard book process in Embodiment 3 of the present invention.
  • Embodiment 4 is a schematic structural diagram of a device in Embodiment 4 of the present invention.
  • FIG. 1 is a flowchart of a method for recording a blackboard book process according to a first embodiment of the present invention.
  • the present embodiment is applicable to a case where a tablet book content of a tablet is recorded.
  • the method may be performed by a blackboard book recording device, and specifically includes the following steps. :
  • Step S110 Collecting voice information during the board writing process, and collecting and saving the board image of the writing board based on the preset period.
  • the voice information is the teacher's detailed explanation of the image content of the blackboard in the teaching process, as well as the communication between the teacher and the student;
  • the image of the blackboard is the image presented on the surface of the writing board, that is, the image of the blackboard contains the teacher in the teaching process, writing The content written on the board.
  • the voice information in the process of the blackboard is collected at the same time, and the image of the blackboard on the writing board is periodically collected and saved.
  • each image collected can be saved; the collected images can also be filtered, that is, each image collected is only a temporary blackboard image, only in a temporary blackboard image.
  • the board image is saved when the value of the board is saved.
  • An effective screening method is to save the temporary board image as a board image and record if the similarity between the temporary board image and the newly saved board image is less than the first threshold. Acquisition time.
  • the content that needs to be collected and presented in one course is mainly the content of the board and the language, but in the process of the board book, the refresh of the board content is faster than the refresh rate of the regular video.
  • the refresh rate of the regular video In terms of writing speed, there is not much content in the board that can be added in 1 second, and the speed of the board is not uniform.
  • the contents of the board are actually not available. Increase; but the video usually refreshes tens of frames in 1 second, which means that if the video of the online course is produced by the conventional video capture method, the content of many frames in the video is repeated or quite close.
  • the collected temporary board image is screened to confirm that the difference between the collected temporary board image and the saved board image reaches a certain range, that is, the similarity is less than the first threshold. It is considered that the temporary book image has a preservation value and is saved as a blackboard image.
  • Step S120 Mapping the collection time of the blackboard image to the time axis of the voice information.
  • the time axis is started from the beginning of a round of voice information collection and board image acquisition, and is generated over time until the end of the collection of a round of voice information and a blackboard image (generally the duration of a class), which is used for The time state of the voice information and the blackboard image acquisition process and the temporal correlation between the two are recorded.
  • the time axis of the voice information is confirmed based on the system time of the device.
  • the corresponding relationship between the time axis of the voice information and the system time is first confirmed, and then according to The correspondence between the acquisition time and the system time confirms the correspondence between the acquisition time and the time axis.
  • the process of collecting voice information continues over time, but in this case, if the teacher writes the content on the tablet, if the content of the board image is not explained and the student The voice information of the interactive interaction and the acquisition of the image of the blackboard are eliminated. At this time, the time axis corresponding to the time period and the invalid information collected (including the voice information and the blackboard image) are eliminated, and the implementation of the invalid information is eliminated. It can further reduce the storage space requirements when occupying memory and saving data.
  • the acquisition time of the blackboard image is mapped to the time axis of the voice information. Specifically, when the teacher writes the content on the writing board, if there is no voice information explaining the image content of the blackboard and interacting with the student, the latest saved blackboard image will be collected and saved, and the image of the blackboard will be collected. The acquisition time is mapped to the time axis of the voice information.
  • Step S130 The voice information and the blackboard image are saved according to the time axis association to generate a blackboard book recording file for continuously outputting the voice information and the blackboard image based on the time axis during playback.
  • the blackboard image is compressed and saved by intra prediction or inter prediction.
  • all frames are divided into three categories, an I frame (Intra-Prediction frame), a B frame (Bi-prediction frame), and a P frame (Prediction frame). That is, intra prediction frames, bidirectional prediction frames, and unidirectional prediction frames, where both bidirectional prediction and unidirectional prediction belong to inter prediction.
  • Each frame is a still picture.
  • various algorithms are used to compress each frame, and a very important part of the compression algorithm is predictive coding.
  • predictive coding there are two types of intra prediction and inter prediction. Intra prediction is to find only in the current frame when looking for a reference block; inter prediction is looking for When referring to a block, similar blocks are found between adjacent frames.
  • the frame is an I frame; if the reference block is found in the already encoded frame, then it is a P frame; if it is in the encoded frame To find the reference block and look for the reference block in the frame to be encoded in the future, then the frame is the B frame.
  • the storage method described above may be used, and the voice information and the blackboard image are in one-to-one correspondence according to the time sequence of saving the voice information and the blackboard image, and saving the generated book.
  • the file is recorded; when the board record file is opened, the voice information and the board image are continuously read and output according to the time axis.
  • the image of the blackboard is saved according to the common video coding method.
  • the content of the board book is opened, the content of the frame is 24 frames per s.
  • the content of the board book in the recording file is played, but the content of the board book is played at the corresponding time in the time axis according to the saving time.
  • the voice information is continuously played, but the same board image is continuously refreshed within 5 seconds.
  • the continuous display time of a certain board image is recorded by the duration of the recording during the saving or the time mapped in the time axis, for example, the first board.
  • the image display 5s, the second board image display 7s, ...; or, the first board image is displayed from 00:00:00, and the second board image is displayed from 00:00:07, ....
  • the technical solution of the embodiment collects and saves the blackboard image of the writing board based on the preset period, and maps the collection time of the board image to the time axis of the voice information; and saves the voice based on the time axis association.
  • Information and board image generation board book record file when the board book record file is opened, the voice information and the board image are continuously output based on the time axis, which solves the problem that the amount of data of the board record file is too large, thereby reducing the amount of teaching video data and reducing the network course.
  • FIG. 2 is a flowchart of a method for recording a blackboard book process according to Embodiment 2 of the present invention.
  • the present embodiment is applicable to a case where a tablet book content of a tablet is recorded.
  • the method may be performed by a blackboard book recording device, and specifically includes the following steps. :
  • Step S210 Collect voice information in the process of writing a book and generate a time axis of the voice information.
  • the corresponding voice information in the process is collected one by one, and the collection time of the voice information is saved, and the time axis is generated according to the acquisition time of the voice information.
  • Step S220 Save the initial blackboard image of the writing board, collect the temporary board image of the writing board based on the preset period, and compare the similarity between the temporary board image and the newly saved board image.
  • the writing board can be an electronic whiteboard provided by the touch screen terminal, or can be a traditional blackboard.
  • the electronic whiteboard can collect the image of the book by intercepting the closed image formed by the writing area of the electronic whiteboard on the terminal display interface, and the traditional blackboard can collect the book by capturing the image through the camera facing the surface of the writing board. image.
  • an electronic whiteboard can be set beside the blackboard, and the image of the blackboard book collected from the blackboard can be displayed according to the current board content on the blackboard, for example, in the process of writing the contents of the board, the erase will be erased.
  • the image of the board book corresponding to the content of the previous board is displayed in the electronic whiteboard. After the content of the current board is written, it needs to be erased on the blackboard, and the writing of the content of the new board is restarted.
  • the complete book image corresponding to the contents of the book (a plurality of book images are generated during the writing of a board book content) is displayed in the electronic whiteboard.
  • the image of the board book on the writing board will be collected as a temporary board image at a certain period.
  • the similarity comparison between the timebook image and the newly saved blackboard image that is, whether the temporary blackboard image has the latest board content compared with the newly saved blackboard image.
  • Step S230 If the similarity between the temporary blackboard image and the newly saved blackboard image is less than the first threshold, the temporary blackboard image is saved as a blackboard image and the collection time is recorded.
  • the temporary board image and the newly saved board image are less, that is, when the similarity is less than the first threshold, and the content of the temporary board image is updated, the temporary board image is saved as a blackboard image, and the latest saved image is removed.
  • the image of the book is recorded at the same time as the image of the book.
  • Step S240 Mapping the collection time of the blackboard image to the time axis of the voice information.
  • Step S250 The voice information and the blackboard image are saved based on the time axis association to generate a blackboard book recording file for continuously outputting the voice information and the blackboard image based on the time axis during playback.
  • Step S260 Upload the board record file to the web course server to open the board record file by accessing the web course server.
  • the similarity degree comparison is performed between the temporary board image and the newly saved board image, the collection time of the board image is mapped to the time axis of the voice information, and the voice information and the board image generation board are saved based on the time axis association. Recording files, when the board file is opened, the voice information and the board image are continuously output based on the time axis, which solves the problem that the prior art network course takes up a large memory.
  • the problem is to collect and save the contents of the blackboard and the voice information, so that the students can learn in a targeted manner after class and the network course takes up less memory.
  • FIG. 3 is a schematic structural diagram of a recording apparatus of a blackboard book process according to Embodiment 3 of the present invention.
  • the present embodiment is applicable to a case where a tablet book content of a tablet is recorded.
  • the recording device includes:
  • the collecting module 310 is configured to collect voice information during the board writing process, and collect and save the board image of the writing board based on the preset period;
  • the mapping module 320 is configured to map the collection time of the blackboard image to the time axis of the voice information
  • the generating module 330 is configured to save the voice information and the blackboard image based on the time axis association to generate a blackboard book recording file that continuously outputs the voice information and the blackboard image based on the time axis during playback.
  • the collecting module 310 includes:
  • a generating unit configured to collect voice information during a blackboard book and generate a time axis of the voice information
  • a comparison unit configured to save an initial blackboard image of the writing board, collect a temporary blackboard image of the writing board based on a preset period, and compare the similarity between the temporary blackboard image and the newly saved blackboard image;
  • a saving unit configured to save the temporary book image as a blackboard image and record the collection time if the similarity between the temporary book image and the newly saved blackboard image is less than a first threshold.
  • the mapping module 320 includes:
  • a confirmation unit configured to confirm a correspondence between a time axis of the voice information and a system time, and confirm a correspondence between the collection time and a time axis according to the correspondence between the collection time and the system time;
  • mapping unit configured to display the blackboard image based on a correspondence between the collection time and a time axis The acquisition time is mapped to the time axis of the voice information.
  • the blackboard image is compressed and saved by intra prediction or inter prediction.
  • the uploading module is used to upload the board record file to the web course server to open the board book record file by accessing the web course server.
  • the recording device of the above-mentioned blackboard book process can perform the recording method of the blackboard book process provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.
  • the device includes a processor 410, a memory 420, an input device 430, an output device 440, a microphone 450, and a camera 460.
  • the number of the devices 410 may be one or more, and one processor 410 is taken as an example in FIG. 4; the processor 410, the memory 420, the input device 430, the output device 440, the microphone 450, and the camera 460 of the device may be through a bus or other means. Connection, as shown in Figure 4 by bus connection.
  • the memory 420 is used as a computer readable storage medium, and can be used to store a software program, a computer executable program, and a module, such as a program instruction/module corresponding to the recording method of the blackboard book process in the embodiment of the present invention (for example, in a blackboard processing device)
  • the processor 410 executes various functional applications and data processing of the device by running software programs, instructions, and modules stored in the memory 420, that is, a recording method of the above-described board-writing process.
  • the memory 420 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function; and the storage data area may be stored according to the terminal. Use the data created, etc.
  • memory 420 can include high speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.
  • memory 420 can further include memory remotely located relative to processor 310, which can be connected to the device over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • Input device 430 can be used to receive input digital or character information and to generate key signal inputs related to user settings and function control of the device.
  • Output device 440 can include a display device such as a display screen.
  • the information and the blackboard image are used to generate a blackboard book recording file in which the voice information and the blackboard image are continuously output based on the time axis during playback.
  • the fifth embodiment of the present invention further provides a computer readable storage medium, where the computer program is stored, and when the program is executed by the processor, the recording method of the blackboard book process described in the foregoing embodiment is implemented, and the method includes: collecting the blackboard book Voice information, and collecting and saving a blackboard image of the tablet based on a preset period; mapping an acquisition time of the blackboard image to a time axis of the voice information; and saving the voice information and the blackboard image based on the time axis association And generating a blackboard book recording file for continuously outputting the voice information and the blackboard image based on the time axis during playback.
  • a computer readable storage medium provided by an embodiment of the present invention is not limited to a computer program.
  • the related operations in the recording method of the blackboard book process provided by any of the embodiments of the present invention can also be performed.
  • the present invention can be implemented by software and necessary general hardware, and can also be implemented by hardware, but in many cases, the former is a better implementation. .
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk of a computer.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • FLASH FLASH
  • hard disk or optical disk etc., including a number of instructions to make a computer device (can be a personal computer) , a server, or a network device, etc.)
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • FLASH FLASH
  • hard disk or optical disk etc., including a number of instructions to make a computer device (can be a personal computer) , a server, or a network device, etc.)

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Abstract

本发明公开了一种板书过程的记录方法、装置、设备和存储介质，包括：采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；将所述板书图像的采集时刻映射到所述语音信息的时间轴；基于所述时间轴关联保存所述语音信息和板书图像，以生成播放时基于所述时间轴连续输出语音信息和板书图像的板书记录文件。本发明解决了板书记录文件数据量过大的问题，降低了教学视频数据量和减少了网络课程文件的占用内存。

Description

一种板书过程的记录方法、装置、设备和存储介质 技术领域
本发明实施例涉及电子教学技术，尤其涉及一种板书过程的记录方法、装置、设备和存储介质。
背景技术
网络教育是互联网时代的产物，是一个新型的领域，由于其不受时间和地区的限制，越来越多的人通过网络课程进行学习。
在现有的网络课程视频中，由于将教学过程的所有板书内容都拍摄下来，使得视频文件中多了一些多余的数据信息，教学录像的数据量大，从而导致网络课程的视频文件的占用内存过大，且视频流量的要求过高。
发明内容
本发明提供一种板书过程的记录方法、装置、设备和存储介质，以实现减少教学视频的数据量，以及视频文件的占用内存。
第一方面，本发明实施例提供了一种板书过程的记录方法，包括：
采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；
将所述板书图像的采集时刻映射到所述语音信息的时间轴；
基于所述时间轴关联保存所述语音信息和板书图像，以生成播放时基于所述时间轴连续输出所述语音信息和板书图像的板书记录文件。
第二方面，本发明实施例还提供了一种板书过程的记录装置，包括：
采集模块，用于采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；
映射模块，用于将所述板书图像的采集时刻映射到所述语音信息的时间轴；
生成模块，用于基于所述时间轴关联保存所述语音信息和板书图像，以生成播放时基于所述时间轴连续输出所述语音信息和板书图像的板书记录文件。
第三方面，本发明实施例还提供了一种设备，包括：
一个或多个处理器；
存储器，用于存储一个或多个程序；
麦克风，用于采集语音信息；
摄像头，用于采集图像；
当所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现上述的板书过程的记录方法。
第四方面，本发明实施例还提供了一种计算机可读存储介质，该程序被处理器执行时实现上述的板书过程的记录方法。
本发明通过采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；将所述板书图像的采集时刻映射到所述语音信息的时间轴；基于所述时间轴关联保存所述语音信息和板书图像生成板书记录文件，所述板书记录文件打开时，基于所述时间轴连续输出所述语音信息和板书图像，解决了网络课程的数据量过大的问题，实现了降低网络课程视频文件的占用内存的效果。
附图说明
图1是本发明实施例一中的板书过程的记录方法的流程图。
图2是本发明实施例二中的板书过程的记录方法的流程图。
图3是本发明实施例三中的板书过程的记录装置的结构示意图。
图4是本发明实施例四中的设备的结构示意图。
具体实施方式
下面结合附图和实施例对本发明作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本发明，而非对本发明的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本发明相关的部分而非全部结构。
实施例一
图1为本发明实施例一提供的板书过程的记录方法的流程图，本实施例可适用于对书写板的板书内容进行记录的情况，该方法可以由板书记录装置来执行，具体包括如下步骤：
步骤S110、采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像。
其中，语音信息为老师在教学过程中对板书图像内容的详细讲解，以及老师和学生进行交流等内容；板书图像为书写板表面呈现的图像，即板书图像包含了老师在教学过程中，在书写板上书写的内容。对板书图像进行采集的过程中，同时采集板书过程中的语音信息，周期性地对书写板上的板书图像进行采集和保存。
在具体的实施过程中，可以将采集到的每一张图像进行保存；也可以对采集到的图像进行筛选，即采集到的每一张图像最初只是临时板书图像，只有在一张临时板书图像具备保存价值时才保存该板书图像，一种有效的筛选方式是若所述临时板书图像与最新保存的板书图像的相似度小于第一阈值，则将所述临时板书图像保存为板书图像并记录采集时刻。
具体到教学过程中，对于一节课程中所需要采集和呈现的内容，主要是板书内容和语言讲解，而实际在板书过程中，板书内容的刷新是没有常规视频的刷新速度快的，按正常的书写速度而言，1秒实际上能新增的板书内容不多，并且板书内容增加的速度不均匀，例如阶段性的板书完成后需要进行对应的讲解，这一过程中板书内容实际上没有增加；但是视频通常1秒刷新几十帧，也就是说如果采用常规的视频采集方式制作网络课程的视频，视频中有很多帧的内容是重复或相当接近的。在本方案中，基于板书内容的变化特点，对采集的临时板书图像进行筛选，确认采集的临时板书图像与已保存的板书图像的差异达到一定的范围，也就是相似度小于第一阈值，则认为该临时板书图像存在保存价值，将其保存为板书图像。
步骤S120、将所述板书图像的采集时刻映射到所述语音信息的时间轴。
其中，时间轴是一轮语音信息采集和板书图像采集的开始而开始，随着时间的推移而生成直到一轮语音信息和板书图像的采集结束(一般是一节课的时长)，其用于记录语音信息和板书图像采集过程中的时间状态以及二者之间的时间关联。
一般而言，语音信息的时间轴基于设备的系统时间确认，在具体建立对应关系的过程中，首先确认语音信息的时间轴与系统时间的对应关系，然后根据 采集时刻与系统时间的对应关系确认采集时刻与时间轴的对应关系。
通常来说，语音信息的采集过程是随着时间的推移而持续进行的，但是具体到本方案中，如果老师在书写板上对内容进行书写时，若没有对板书图像内容进行讲解以及和学生进行交流互动的语音信息，同时也没有板书图像的采集，此时就会剔除这一段时间对应的时间轴以及采集到的无效信息(包括语音信息和板书图像)，这一剔除无效信息的实现方式可以进一步减少占用内存和保存数据时对存储空间的要求。
基于采集时刻与时间轴的对应关系，将板书图像的采集时刻映射到语音信息的时间轴。具体是，老师在书写板上对内容进行书写时，若没有对板书图像内容进行讲解以及和学生进行交流互动的语音信息，此时，就会采集和保存最新保存的板书图像，并将板书图像的采集时刻映射到语音信息的时间轴上。
步骤S130、基于所述时间轴关联保存所述语音信息和板书图像，以生成播放时基于所述时间轴连续输出所述语音信息和板书图像的板书记录文件。
本方案中，通过帧内预测或帧间预测对板书图像进行压缩保存。具体是，在常规的视频压缩编码中，所有的帧被分成了三个种类，I帧(Intra-Prediction帧)，B帧(Bi-prediction帧)和P帧(Prediction帧)。即帧内预测帧，双向预测帧以及单向预测帧，其中，双向预测和单向预测都属于帧间预测。
其中，每一帧都是一张静止的图片，在HEVC或者以前的标准中，会采用各种各样的算法去压缩每一帧，而压缩算法中的很重要的一个部分就是预测编码，在预测编码中，有帧内预测(intra prediction)与帧间预测(inter prediction)两个种类，帧内预测，就是在找参照块的时候，只在当前帧内寻找；而帧间预测，在找参照块的时候会在相邻的帧之间去找相似块。因此，基于上述帧编码 方式，如果说当前帧是只在当前帧内寻找参照块的话，那么该帧就是I帧；如果在已经编码的帧里面寻找参照块的话，那么它是P帧；如果既在已编码的帧里去寻找参照块，又在未来将要被编码的帧里去寻找参照块的话，那么该帧就是B帧。
在本方案中，板书图像因为需要进行连续保存，可以采用前文所述的保存方式，按照保存语音信息和板书图像的时间顺序，将语音信息和板书图像进行一一对应，并将其保存生成板书记录文件；当打开板书记录文件时，根据时间轴将连续读取和输出语音信息和板书图像。需要注意的是，板书图像的保存时按照常见的视频编码的方式进行保存，但是在打开板书记录文件播放其中的内容时，并不是按人眼舒适放松时可视帧数24帧/s进行板书记录文件中的板书内容播放，而是按照保存时该板书内容在时间轴中对应的时刻进行播放，例如时间轴中某一段时间内有5s语音信息，有一张板书图像，那么在这5s内，持续播放语音信息，但是在5s内持续刷新显示同一张板书图像，具体某一张板书图像的持续显示时间通过保存时记录的持续时长或在时间轴中映射的时刻进行记录，例如第一张板书图像显示5s、第二张板书图像显示7s、……；或者，第一张板书图像从00：00：00开始显示、第二种板书图像从00：00：07开始显不、……。
本实施例的技术方案，通过采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；将板书图像的采集时刻映射到语音信息的时间轴；基于时间轴关联保存语音信息和板书图像生成板书记录文件，板书记录文件打开时，基于时间轴连续输出语音信息和板书图像，解决了板书记录文件数据量过大的问题，从而降低了教学视频数据量和减少了网络课程文件的占用内 存。
实施例二
图2为本发明实施例二提供的板书过程的记录方法的流程图，本实施例可适用于对书写板的板书内容进行记录的情况，该方法可以由板书记录装置来执行，具体包括如下步骤：
步骤S210、采集板书过程中的语音信息并生成语音信息的时间轴。
在采集板书图像过程中，将此过程中对应的语音信息进行一一采集，同时保存语音信息的采集时刻，根据语音信息的采集时刻生成时间轴。
步骤S220、保存书写板初始的板书图像，基于预设周期采集书写板的临时板书图像，将临时板书图像与最新保存的板书图像进行相似度比较。
其中，书写板可以为触摸屏终端提供的电子白板，也可以为传统黑板。对书写板上的板书图像进行采集时，电子白板可以通过在终端显示界面上截取电子白板的书写区域形成的封闭图像来采集板书图像，传统黑板可通过朝向书写板表面的摄像头拍摄图像来采集板书图像。
尤其对于传统黑板，可以在黑板旁设置一电子白板，从黑板上采集到的板书图像，可以根据黑板上当前的板书内容选择进行显示，例如在一板板书内容进行书写的过程中，将擦除的前一板板书内容对应的板书图像在电子白板中进行显示，在当前一板板书内容书写完毕之后需要在黑板上擦除，并重新开始新一板板书内容的书写，此时可以将擦除的板书内容对应的完整的板书图像(一板板书内容的书写过程中会产生多个板书图像)在电子白板中进行显示。
同时，将以一定的周期采集书写板上的板书图像作为临时板书图像，对临 时板书图像与最新保存的板书图像进行相似度比较，即临时板书图像与最新保存的板书图像相比，是否有最新的板书内容。
步骤S230、若临时板书图像与最新保存的板书图像的相似度小于第一阈值，则将临时板书图像保存为板书图像并记录采集时刻。
若临时板书图像与最新保存的板书图像中的重复内容较少，即相似度小于第一阈值时，临时板书图像中更新的内容较多，则将临时板书图像保存为板书图像，剔除最新保存的板书图像，同时记录采集板书图像的时刻。
步骤S240、将板书图像的采集时刻映射到所述语音信息的时间轴。
步骤S250、基于时间轴关联保存语音信息和板书图像，以生成播放时基于所述时间轴连续输出所述语音信息和板书图像的板书记录文件。
步骤S260、将板书记录文件上传到网络课程服务器，以通过访问网络课程服务器打开板书记录文件。
为了便于学生在课后复习使用，或者为便于教育欠发达地区的学生共享优质教育资源，或者为便于有成人学习需求的成年人获取教育资源，将具有重复内容的板书图像和无声效的语音信息进行剔除，将有效的板书记录文件上传到网络课程服务器，可通过终端设备访问网络课程服务器，获取网络课程服务器中保存的板书记录文件，远程获得教学过程的记录，或进行课后复习，或观摩优质教学活动，或基于网络教育资源进行成人学习和自我提高。
本实施例的技术方案，通过临时板书图像与最新保存的板书图像进行相似度比较，将板书图像的采集时刻映射到所述语音信息的时间轴，基于时间轴关联保存语音信息和板书图像生成板书记录文件，板书记录文件打开时，基于时间轴连续输出语音信息和板书图像，解决了现有技术网络课程占用内存较大的 问题，实现对板书内容和语音信息进行采集和保存，便于学生课后针对性地学习和网络课程占用内存少的效果。
实施例三
图3为本发明实施例三提供的板书过程的记录装置的结构示意图，本实施例可适用于对书写板的板书内容进行记录的情况，该记录装置包括：
采集模块310，用于采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；
映射模块320，用于将板书图像的采集时刻映射到语音信息的时间轴；
生成模块330，用于基于时间轴关联保存语音信息和板书图像，以生成播放时基于所述时间轴连续输出所述语音信息和板书图像的板书记录文件。
作为其中一种实施方式，所述采集模块310包括：
生成单元，用于采集板书过程中的语音信息并生成所述语音信息的时间轴；
比较单元，用于保存所述书写板初始的板书图像，基于预设周期采集书写板的临时板书图像，将所述临时板书图像与最新保存的板书图像进行相似度比较；
保存单元，用于若所述临时板书图像与最新保存的板书图像的相似度小于第一阈值，则将所述临时板书图像保存为板书图像并记录采集时刻。
所述映射模块320，包括：
确认单元，用于确认所述语音信息的时间轴与系统时间的对应关系，根据所述采集时刻与系统时间的对应关系确认所述采集时刻与时间轴的对应关系；
映射单元，用于基于所述采集时刻与时间轴的对应关系，将所述板书图像 的采集时刻映射到所述语音信息的时间轴。
进一步地，板书图像通过帧内预测或帧间预测进行压缩保存。
进一步地，还包括：
上传模块，用于将板书记录文件上传到网络课程服务器，以通过访问网络课程服务器打开板书记录文件。
上述板书过程的记录装置可执行本发明任意实施例所提供的板书过程的记录方法，具备执行方法相应的功能模块和有益效果。
实施例四
图4为本发明实施例四提供的一种设备的结构示意图，如图4所示，该设备包括处理器410、存储器420、输入装置430、输出装置440、麦克风450和摄像头460；设备中处理器410的数量可以是一个或多个，图4中以一个处理器410为例；设备的处理器410、存储器420、输入装置430、输出装置440、麦克风450和摄像头460可以通过总线或其他方式连接，图4中以通过总线连接为例。
存储器420作为一种计算机可读存储介质，可用于存储软件程序、计算机可执行程序以及模块，如本发明实施例中的板书过程的记录方法对应的程序指令/模块(例如，板书处理装置中的采集模块310、映射模块320和生成模块330)。处理器410通过运行存储在存储器420中的软件程序、指令以及模块，从而执行设备的各种功能应用以及数据处理，即实现上述的板书过程的记录方法。
存储器420可主要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序；存储数据区可存储根据终端的使 用所创建的数据等。此外，存储器420可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他非易失性固态存储器件。在一些实例中，存储器420可进一步包括相对于处理器310远程设置的存储器，这些远程存储器可以通过网络连接至设备。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。输入装置430可用于接收输入的数字或字符信息，以及产生与设备的用户设置以及功能控制有关的键信号输入。输出装置440可包括显示屏等显示设备。
并且，上述所包括一个或多个程序被所述一个或多个处理器410执行时，程序进行如下操作：
采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；将所述板书图像的采集时刻映射到所述语音信息的时间轴；基于所述时间轴关联保存所述语音信息和板书图像，以生成播放时基于所述时间轴连续输出所述语音信息和板书图像的板书记录文件。
实施例五
本发明实施例五还提供一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时实现上述实施例所述的板书过程的记录方法，该方法包括：采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；将所述板书图像的采集时刻映射到所述语音信息的时间轴；基于所述时间轴关联保存所述语音信息和板书图像，以生成播放时基于所述时间轴连续输出所述语音信息和板书图像的板书记录文件。
当然，本发明实施例所提供的一种计算机可读存储介质，其计算机程序不限 于如上所述的方法操作，还可以执行本发明任意实施例所提供的板书过程的记录方法中的相关操作。
通过以上关于实施方式的描述，所属领域的技术人员可以清楚地了解到，本发明可借助软件及必需的通用硬件来实现，当然也可以通过硬件实现，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如计算机的软盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、闪存(FLASH)、硬盘或光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述的板书过程的记录方法。
值得注意的是，上述板书过程的记录装置的实施例中，所包括的各个单元和模块只是按照功能逻辑进行划分的，但并不局限于上述的划分，只要能够实现相应的功能即可；另外，各功能单元的具体名称也只是为了便于相互区分，并不用于限制本发明的保护范围。
注意，上述仅为本发明的较佳实施例及所运用技术原理。本领域技术人员会理解，本发明不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本发明的保护范围。因此，虽然通过以上实施例对本发明进行了较为详细的说明，但是本发明不仅仅限于以上实施例，在不脱离本发明构思的情况下，还可以包括更多其他等效实施例，而本发明的范围由所附的权利要求范围决定。

Claims (10)

  1. 一种板书过程的记录方法，其特征在于，包括：
    采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；
    将所述板书图像的采集时刻映射到所述语音信息的时间轴；
    基于所述时间轴关联保存所述语音信息和板书图像，以生成播放时基于所述时间轴连续输出语音信息和板书图像的板书记录文件。
  2. 根据权利要求1所述的板书过程的记录方法，其特征在于，所述采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像，包括：
    采集板书过程中的语音信息并生成所述语音信息的时间轴；
    保存所述书写板初始的板书图像，基于预设周期采集书写板的临时板书图像，将所述临时板书图像与最新保存的板书图像进行相似度比较；
    若所述临时板书图像与最新保存的板书图像的相似度小于第一阈值，则将所述临时板书图像保存为板书图像并记录采集时刻。
  3. 根据权利要求2所述的板书过程的记录方法，其特征在于，所述将所述板书图像的采集时刻映射到所述语音信息的时间轴，包括：
    确认所述语音信息的时间轴与系统时间的对应关系，根据所述采集时刻与系统时间的对应关系确认所述采集时刻与时间轴的对应关系；
    基于所述采集时刻与时间轴的对应关系，将所述板书图像的采集时刻映射到所述语音信息的时间轴。
  4. 根据权利要求1所述的板书过程的记录方法，其特征在于，所述板书图像通过帧内预测或帧间预测进行压缩保存。
  5. 根据权利要求1所述的板书过程的记录方法，其特征在于，所述基于所 述时间轴关联保存所述语音信息和板书图像生成板书记录文件之后，还包括：
    将所述板书记录文件上传到网络课程服务器，以通过访问所述网络课程服务器打开所述板书记录文件。
  6. 一种板书过程的记录装置，其特征在于，包括：
    采集模块，用于采集板书过程中的语音信息，并基于预设周期采集和保存书写板的板书图像；
    映射模块，用于将所述板书图像的采集时刻映射到所述语音信息的时间轴；
    生成模块，用于基于所述时间轴关联保存所述语音信息和板书图像，以生成播放时基于所述时间轴连续输出语音信息和板书图像的板书记录文件。
  7. 根据权利要求6所述的板书过程的记录装置，其特征在于，所述采集模块，包括：
    生成单元，用于采集板书过程中的语音信息并生成所述语音信息的时间轴；
    比较单元，用于保存所述书写板初始的板书图像，基于预设周期采集书写板的临时板书图像，将所述临时板书图像与最新保存的板书图像进行相似度比较；
    保存单元，用于若所述临时板书图像与最新保存的板书图像的相似度小于第一阈值，则将所述临时板书图像保存为板书图像并记录采集时刻。
  8. 根据权利要求7所述的板书过程的记录装置，其特征在于，所述映射模块，包括：
    确认单元，用于确认所述语音信息的时间轴与系统时间的对应关系，根据所述采集时刻与系统时间的对应关系确认所述采集时刻与时间轴的对应关系；
    映射单元，用于基于所述采集时刻与时间轴的对应关系，将所述板书图像 的采集时刻映射到所述语音信息的时间轴。
  9. 一种设备，其特征在于，所述设备包括：
    一个或多个处理器；
    存储器，用于存储一个或多个程序；
    麦克风，用于采集语音信息；
    摄像头，用于采集图像；
    当所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现如权利要求1-5中任一所述的板书过程的记录方法。
  10. 一种计算机可读存储介质，其上存储有计算机程序，其特征在于，该程序被处理器执行时实现如权利要求1至5中任一所述的板书过程的记录方法。
PCT/CN2017/116774 2017-08-18 2017-12-17 一种板书过程的记录方法、装置、设备和存储介质 Ceased WO2019033665A1 (zh)

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