CN101917620A - Method for intraframe coding of geographic information in MEPG-2 video coding - Google Patents
Method for intraframe coding of geographic information in MEPG-2 video coding Download PDFInfo
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Abstract
The invention discloses a method for intraframe coding of geographic information in MEPG-2 video coding. By the method, the geographic information is coded in video frame data, a video image and geographic information data are really fused into a new image object with the geographic information; and in the process of decoding a coded video with the geographic information data, no extra expense is caused nearly compared with the conventional video decoding process. By the reconstruction of an acquisition model, the efficiency of the interactive operation of a video system and a geographic information system can be improved, and the retrieval speed of video files and video segments can be quickened.
Description
Technical field
The present invention relates to field of video encoding, network flow-medium transmission field and GIS-Geographic Information System field, relate in particular to the method for intraframe coding geography information in a kind of MEPG-2 video coding.
Background technology
Directly obtain the geography information related data by capture video, obtained increasing application, be a difficult problem but how video itself and geography information are combined and utilize effectively always.Video system and geography information are carried out combination, mainly contain two main flow directions at present both at home and abroad: the one, frame position and geography information position correspondence with video are stored in this corresponding data in external data base or the external file; The 2nd, in the process of video acquisition, produce the corresponding data of frame position and geography information, but be coded in the video file itself.Though the data that adopt which kind of mode to store, all will be in decode procedure can the data reconstruction collection model, and video file and video clips managed and retrieve.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, the method for intraframe coding geography information in a kind of MEPG-2 video coding is provided.
The objective of the invention is to be achieved through the following technical solutions:
The method of intraframe coding geography information in a kind of MEPG-2 video coding comprises following step:
(1) obtains video flowing and geography information and coding;
(2) geographic information data in the video is decoded;
(3) the geographic information data reconstruction video collection model by decoding;
(4) by the video acquisition model video file and video clips are carried out geographic information retrieval.
The invention has the beneficial effects as follows that the present invention is coded in geography information in the video requency frame data, really video image and geographic information data are fused to the new image object that has geography information; Carry out in the decode procedure at the video that coding is had geographic information data, comparing traditional video decoding process does not almost have unnecessary expense; Can improve the efficient of video system and GIS-Geographic Information System interactive operation by the reconstruction of collection model, accelerate the retrieval rate of video file and video clips.
Description of drawings
Fig. 1 is a video acquisition process schematic diagram;
Fig. 2 is a video capture device state parameter schematic diagram, wherein, (a) is shooting angle parameter schematic diagram, (b) for taking visual angle parameter schematic diagram;
Fig. 3 is a geographic information data organizational form structure chart;
Fig. 4 is an intraframe coding geographic information data schematic diagram;
Fig. 5 is geography information decoding process figure;
Fig. 6 video acquisition Model Reconstruction flow chart;
Fig. 7 is a video acquisition model XML data organization form schematic diagram.
Embodiment
As shown in the figure, the method for intraframe coding geography information in the MEPG-2 video coding of the present invention mainly comprises following step:
1, obtains video flowing and geography information and coding
Obtain not encoded original video stream (raw image data stream) by video capture device; The transducer that is equipped with by video capture device obtains video capture device state parameter (lens parameters and shooting state parameter), comprise α, β, four angles of γ, δ, wherein α represents that the current shooting direction is at the projection on ground and the angle of north geographic pole, β represents the angle of current shooting direction line perpendicular to the ground in the vertical plane of ground, γ and δ represent the horizontal view angle and the vertical angle of view of collecting device respectively, as shown in Figure 2; Obtain the geographical location information data of current video collecting device by the GPS positioning equipment, comprise UTC time, height above sea level, longitude, latitude, the geographic information data block structure that is made of geographical location information data and video capture device state parameter as shown in Figure 3.With original video stream and the geography information stream input video coding module that is combined into, use the FFMPEG codec of increasing income to carry out the coding of video and geography information, increase uint8_t GIS_data_size and two variablees of uint8_t*GIS_data are deposited the size of geographical information data block and the internal memory pointer of geographic information data piece respectively in the AVCodecContext structure, in the process of coding, use these two variablees to import the geographic information data piece into encoder, be added on the position after the Group Header in the ES stream then, and with last five optional positions 1 of Group Header.In the process of original video stream being carried out the MPEG-2 coding, the position that the geographic information data piece adds in ES stream has guaranteed the corresponding I frame of a geographic information data piece as shown in Figure 4.After being encoded into ES stream, form PES stream and TS stream by packing, and finally carry out this locality storage and Network Transmission, whole process is as shown in Figure 1.
2, the geographic information data in the video is decoded
Group Header structure in the ES stream that in Moving Picture Experts Group-2, defines, last 5 of its last byte are not utilized, we utilize these 5 as a token of the position be indicated in whether use geographic information data after the Group Header, if geographic information data is arranged then read the size that next byte obtains the geographic information data piece, and read out according to this big young pathbreaker geographic information data thereafter.In the process that the MEPG-2 video flowing is decoded, after being resolved to GOP Header, read last five, if last five all is 0, then continuing decoding according to the decoding process of standard MPEG-2, is Integer N otherwise enter the decoding process of intraframe coding geography information video flowing and read next byte, when N greater than 0 the time, the data that continue to read a follow-up N byte are as geographic information data, and whole process as shown in Figure 5.
3, the geographic information data reconstruction video collection model by decoding
The video acquisition model is that the computer data of a video acquisition overall process is described, and by the video acquisition model, can reappear the whole video gatherer process.Behind first I frame of decoding, the angle information and the positional information of the geographic information data that decodes are set to initial value, before video finishes, angle information in the geographic information data of subsequent decoding frame and positional information angle information and the positional information with previous frame compared, when difference during greater than specific threshold, increase record, the reconstruction flow process of video acquisition model as shown in Figure 6, the data organization of video acquisition model is made up of file and record, a video acquisition model index inside is made up of different video file nodes, each video file is made up of the record node of different time points, the routing information of Archive sit include file and record node sum information, the record node comprises video clips zero-time and concluding time information and longitude and latitude, height above sea level, take 4 information such as angle parameter, organizational form as shown in Figure 7.By setting threshold values in various degree, can avoid data redundancy effectively.
4, by the video acquisition model video file and video clips are carried out geographic information retrieval
The data organization of a video acquisition model uses the video acquisition model to carry out retrieval based on the video clips of geographic information data, the process that a video acquisition model file is retrieved exactly as shown in Figure 7.In xml document shown in Figure 7, each bar record is exactly a video clips, is exactly the retrieval of writing down in the xml document to the retrieval of video clips.Wherein, a video file is made up of many records, promptly is made up of many video clips; A record or a video clips are made up of geographic information data, collecting device state parameter and time again, and the time comprises time zone time and this segment residing play start time point and the concluding time point in the whole video file when this segment is gathered.
Claims (5)
1. the method for intraframe coding geography information in the MEPG-2 video coding is characterized in that, comprises following step:
(1) obtains video flowing and geography information and coding.
(2) geographic information data in the video is decoded.
(3) the geographic information data reconstruction video collection model by decoding.
(4) by the video acquisition model video file and video clips are carried out geographic information retrieval.
2. according to the method for intraframe coding geography information in the described MEPG-2 video coding of claim 1, it is characterized in that described step (1) is specially: obtain not encoded original video stream by video capture device.The transducer that is equipped with by video capture device obtains the video capture device state parameter: α, β, four angles of γ, δ, α is that the current shooting direction is at the projection on ground and the angle of north geographic pole, β is the angle of current shooting direction line perpendicular to the ground in the vertical plane of ground, and γ and δ are respectively the horizontal view angle and the vertical angle of view of collecting device.Obtain the geographical location information data of current video collecting device by the GPS positioning equipment: UTC time, height above sea level, longitude, latitude.Geographical location information data and video capture device state parameter constitute geography information.With original video stream and geography information stream input video coding module, carry out the coding of video and geography information.
3. according to the method for intraframe coding geography information in the described MEPG-2 video coding of claim 1, it is characterized in that, described step (2) is specially: the Group Header structure in the ES stream that defines in Moving Picture Experts Group-2, last 5 of its last byte are not utilized, utilize these 5 as a token of the position be indicated in whether use geographic information data after the Group Header, if geographic information data is arranged then read the size that next byte obtains the geographic information data piece, and read out according to this big young pathbreaker geographic information data thereafter.In the process that the MEPG-2 video flowing is decoded, after being resolved to GOP Header, read last five, if last five all is 0, then the decoding process according to standard MPEG-2 continues decoding, otherwise entering the decoding process of intraframe coding geography information video flowing and reading next byte is Integer N, when N greater than 0 the time, continue to read the data of a follow-up N byte as geographic information data.
4. according to the method for intraframe coding geography information in the described MEPG-2 video coding of claim 1, it is characterized in that, described step (3) is specially: behind first I frame of decoding, the angle information and the positional information of the geographic information data that decodes are set to initial value, before video finishes, angle information in the geographic information data of subsequent decoding frame and positional information angle information and the positional information with previous frame compared,, increase record when difference during greater than specific threshold.The data organization of video acquisition model is made up of file and record, a video acquisition model index inside is made up of different video file nodes, each video file is made up of the record node of different time points, the routing information of Archive sit include file and record node sum information, record node comprise video clips zero-time and concluding time information and longitude and latitude, height above sea level, 4 information such as angle parameter of shooting.
5. according to the method for intraframe coding geography information in the described MEPG-2 video coding of claim 1, it is characterized in that, described step (4) is specially: use video acquisition model carries out the retrieval based on the video clips of geographic information data, the process that a video acquisition model file is retrieved exactly.This video acquisition model file is the xml document.In the xml document, each bar record is exactly a video clips, is exactly the retrieval of writing down in the xml document to the retrieval of video clips.Wherein, a video file is made up of many records, promptly is made up of many video clips; A record or a video clips are made up of geographic information data, collecting device state parameter and time again, and the time comprises time zone time and this segment residing play start time point and the concluding time point in the whole video file when this segment is gathered.
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| CN102609087A (en) * | 2011-04-19 | 2012-07-25 | 钰创科技股份有限公司 | Image interaction device, interaction image operating system and operation method |
| CN104202601A (en) * | 2014-08-22 | 2014-12-10 | 中国联合网络通信集团有限公司 | Coding method and device for positional information |
| CN106210585A (en) * | 2016-08-15 | 2016-12-07 | 深圳市华宝电子科技有限公司 | A kind of method and device storing automobile video frequency video recording |
| CN106792809A (en) * | 2016-12-08 | 2017-05-31 | 南京华苏科技有限公司 | Panorama is tested and back method and panorama test, playback system |
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| CN103530326A (en) * | 2013-09-25 | 2014-01-22 | 深圳先进技术研究院 | Method for adding geographical location information into video file and creating index |
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Inventor after: Wang Zhipeng Inventor after: Zhou Jie Inventor after: Zhang Bing Inventor after: Chen Qi Inventor after: Zhang Zijian Inventor before: Wang Zhipeng Inventor before: Chen Qi Inventor before: Zhang Zijian |
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