Adjustable compressing method for realizing video code stream frame rate
A compression method and code stream technology, applied in the video field, can solve problems such as complex implementation process, inadvisability, and use restrictions, and achieve the effects of low bandwidth, low power consumption, and low delay
Inactive Publication Date: 2008-09-03
WUHAN UNIV
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However, the hierarchical mechanism of hierarchical B frame technology is based on the hierarchy of B frames, and B frames will bring a certain delay, so this technology is not advisable in low-latency applications.
Moreover, the reference frame management method of H.264 SVC's hierarchical B frame technology is implemented through the memory tag management strategy, and the implementation process is complicated. In applications with strict computational complexity requirements, the use of this technology will also be limited.
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[0040] The present invention proposes a preferred implementation scheme: a low-delay encoding method is adopted, that is, there is no B frame, and a non-P frame is inserted between every two reference frames. Then the current time domain level level[0] with the display sequence number 0 is 0, the current time domain level level[1] with the display sequence number 1 is 1, and the time domain level of the non-P frame is also 1. Therefore, the time domain level of each frame in encoding is changed according to the period of 2×unit_size, and the number of reference frames of the current frame image is limited to two frames at most, and the number of reference frames num stored in the reference frame buffer:
[0041] num = 2 if lo g 2 ( unit ...
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The invention provides a method of implementing video code stream frame rate adjustable compression, the type of the compression image comprises I frame, non-I frame, P frame, non-P frame and B frame, in the process of decoding, time domain level of each frame image of I frame or P frame is varied periodically as the size of unit group; in the process of coding, the time domain level of current frame image is determined according to the current frame image coding sequence firstly, and then the reference frame image of current frame image is obtained according to reference frame selection strategy, the current frame image is encoded, the reference frame caching is updated according the reference frame updating strategy after accomplishing coding; in decoding, the time domain level of current frame image is determined according to the current frame image decoding sequence, and then the reference frame image of current frame image is obtained according to reference frame selection strategy, the current frame image is decoded, the reference frame caching is updated according the reference frame updating strategy after accomplishing decoding. The compressed code stream has the function of adjustable frame rate, which is capable of adapting transmission of different networks and display of different terminal device.
Description
technical field [0001] The invention belongs to the field of video technology, and in particular relates to a compression method for realizing adjustable frame rate of a video code stream. Background technique [0002] There is a strong similarity between each frame of a moving image, so in the process of video compression, motion estimation and motion compensation are used to eliminate information redundancy between frames to achieve the purpose of compression. In this process, the image used for motion estimation is called a reference frame image, usually referred to as a reference frame for short. Since the frames are interlocking and refer to each other during the compression process, any frame cannot be discarded at will, and the frames can only be dropped in the order before the random access point, otherwise prediction errors will occur, and subsequent images cannot be decoded correctly. Such as figure 2 Shown: The dotted line is a random access point. When the deco...
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IPC IPC(8): H04N7/26H04N7/50H04N19/31
Inventor 胡瑞敏王启军牟晓弦刘琼屠增辉
Owner WUHAN UNIV