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Video encoding/decoding method and system based on background modeling and optional differential mode

A video coding and background modeling technology, applied in the field of video compression, can solve problems such as high computational complexity, unsatisfactory detection and segmentation accuracy and unfavorable encoder implementation, so as to improve coding performance and benefit Effect of further processing, adding encoding delay

Active Publication Date: 2010-11-10
PEKING UNIV
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Problems solved by technology

Therefore, the object-based video compression method is an important research direction to solve the video compression problem, but there are two problems: first, object detection and segmentation in video is still an unsolved problem in the field of computer vision and image processing , the existing methods are still not ideal in terms of correctness and accuracy of detection and segmentation, which has become a bottleneck in object-oriented video compression methods; second, the computational complexity of the above-mentioned object detection and segmentation methods is high, which is not conducive to encoder realization of

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  • Video encoding/decoding method and system based on background modeling and optional differential mode
  • Video encoding/decoding method and system based on background modeling and optional differential mode
  • Video encoding/decoding method and system based on background modeling and optional differential mode

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[0042] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] In the present invention, a background modeling method is used for the relatively fixed scene in the video sequence to generate a background image for description by utilizing the feature that the scene in the video sequence is fixed within a certain period of time. In the encoding process, by establishing and updating the background image that describes a relatively fixed scene in the video, a newly introduced differential mode encoding method is selectively used to encode each data block, thereby eliminating the video sequence to a greater extent. Redundancy for better compression performance. Correspondingly, the basic idea of ​​the encoding method is as follows: firstly establish and update the background image to descr...

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Abstract

The invention discloses video encoding / decoding method and system based on background modeling and an optional differential mode. The encoding method comprises the following steps of: modeling and generating a background image by using an input video sequence, and encoding to obtain a reconstructed background image; carrying out pixel or sub-pixel accuracy global motion estimation on each input image to obtain a global motion vector; and carrying out encoding on each video block by selectively using an original mode and a differential mode on the basis of the reconstructed background image and the global motion vector. The invention can improve the encoding performance and has the advantages of not increasing the encoding delay and being beneficial to further processing as the code streamcontains the background image per se.

Description

technical field [0001] The present invention relates to video compression technology in the technical field of digital media processing, and more particularly to a video encoding / decoding method and system based on background modeling and optional differential mode. Background technique [0002] Video compression (also known as video coding) is one of the key technologies in applications such as digital media storage and transmission. Its purpose is to reduce the amount of data in storage and transmission by eliminating redundant information. All current mainstream video compression standards adopt a block-based predictive transformation hybrid coding framework, which eliminates statistical redundancy (including spatial redundancy, temporal redundancy, and information entropy redundancy) in video images through methods such as prediction, transformation, and entropy coding. surplus), in order to achieve the purpose of reducing the amount of data. Because video data has scen...

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Application Information

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IPC IPC(8): H04N7/26H04N7/50G06T7/20H04N19/527
Inventor 高文张贤国梁路宏黄铁军
Owner PEKING UNIV
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