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Side information generation method in distribution type video encoding

A distributed video and information generation technology, applied in the field of information generation, can solve the problems of ignoring the intensity of motion, increasing the complexity of the decoder, unreliable side information, etc., to reduce the coding rate overhead, improve the rate-distortion performance, and reduce the Effect of decoding cost

Active Publication Date: 2013-12-25
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, when the motion trend of the video sequence is severe, the side information generated by the direct method or the averaging method is very unreliable
The most typical existing generation of side information is based on the motion-compensated temporal interpolation (MCTI) method, which mainly includes three steps: motion estimation, motion vector (MV) correction and motion-compensated interpolation, but it will increase the complexity of the decoder , resulting in a certain delay, not suitable for use in real-time transmission scenarios
In addition, the traditional motion compensation interpolation scheme uses the same side information generation algorithm for all position blocks, ignoring the characteristics of uneven motion intensity in each area of ​​the video sequence

Method used

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  • Side information generation method in distribution type video encoding
  • Side information generation method in distribution type video encoding
  • Side information generation method in distribution type video encoding

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specific Embodiment

[0036] At the encoding end, by using the absolute error sum criterion, the discrete cosine coefficient difference between the original frame and the adjacent key frame at the same position is calculated respectively , the specific formula is as follows:

[0037]

[0038] in, and represent the length and width of the location block, respectively, Indicates the pixel coordinates in the location block, Indicates the pixel in the original frame position block B The discrete cosine coefficients of , Indicates the discrete cosine coefficient of the corresponding pixel in the position block B of the key frame adjacent to the original frame.

[0039] Calculated difference between two discrete cosine coefficients with a predetermined threshold For comparison, determine the motion type of the position block:

[0040]

[0041] when When , it represents the smooth motion area, the original frame and the adjacent key frame Very similar or identical, such blocks are...

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Abstract

The invention discloses a side information generation method in distribution type video encoding. The differences of discrete cosine factors of same-position blocks between an original frame and a previous key frame adjacent to the original frame and between the original frame and a next key frame adjacent to the original frame are respectively calculated at an encoding end, the differences of the discrete cosine factors are compared with a preset threshold value, the classified information value is obtained, and therefore whether the position blocks are in a slow motion mode or a strenuous motion mode is judged; if the position blocks move slowly, the encoding end directly discards the position blocks and does not transmit the position blocks, and then the classified information value is directly transmitted to a decoding end, and the decoding end generates the side information directly according to an interpolation algorithm; if the position blocks move strenuously, the classified information value is transmitted to the decoding end, and the decoding end generates the side information according to a fine motion estimation interpolation algorithm. According to side information generation method in the distribution type video encoding, under the condition that encoding complexity is not increased, encoding efficiency is improved, the more accurate side information can be obtained with lower decoding cost, and therefore the image decoding quality is effectively improved.

Description

[0001] technical field [0002] The invention belongs to the field of video compression, and relates to a method for generating side information in distributed video coding. [0003] Background technique [0004] Distributed Video Coding (DVC) is based on the information theory proposed by Slepian. Wolf and Wyner. Ziv in the 1970s, and transfers the computational complexity of the encoder to the decoder. It is characterized by simple encoding, complex decoding, compression performance close to traditional encoding methods, strong anti-error capability, and is suitable for video encoding equipment with limited resources in wireless networks. [0005] At present, the research on distributed video coding schemes at home and abroad mostly focuses on the research of side information, because the quality of side information seriously affects the performance of video image restoration. Distributed video coding systems usually divide video frames into key frames ( frame) and Wyn...

Claims

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Application Information

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IPC IPC(8): H04N7/26
Inventor 张登银吴媛媛王雪梅程春玲
Owner NANJING UNIV OF POSTS & TELECOMM
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