A Video Coding and Decoding Method Based on Scene Model Adaptive Update
A self-adaptive update and video encoding and decoding technology, applied in the field of video encoding and decoding, can solve the problems of enlarging encoding stream, reducing the reference value of scene frames, and encoding too many scene images into encoding stream, so as to ensure encoding quality and save The effect of scene image bit rate
Active Publication Date: 2016-06-08
PEKING UNIV
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Problems solved by technology
[0005] Although the scene modeling coding and transcoding technology based on video content can achieve high performance improvement, the current coding methods based on this method all use a fixed number of frames to update the scene.
If the scene image is updated too frequently, it will cause too many scene images to be encoded into the code stream, which will make the code stream larger; on the contrary, if the scene image is updated only once for a long time, the reference value of the scene frame will be reduced
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[0055] 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.
[0056] The present invention proposes an adaptive scene update method based on the bit stream ratio, the algorithm framework is as follows figure 1 shown, refer to figure 1 , which mainly includes six main parts: scene modeling module, initial scene coding module, updating scene coding module, scene updating decision-making module, scene selection module and frame coding module.
[0057] Among them, the main function of the scene modeling module is to use the decoded video to reconstruct frames, and use a low-complexity scene modeling algorithm to generate scene images.
[0058] The main function of the initial scene encoding module is to encode the initial scene frame. Since the initial scene frame will be referenced by many sub...
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The invention provides a video coding and decoding method based on self-adaption updating of a scene model. The video coding and decoding method includes: firstly calculating a plurality of frames before scene image updating, a plurality of frames after scene image updating and code stream magnitude relationships of the scene images, and judging whether scene updating is required at the current position with the frames and the relationships; then performing forecasting coding on the updated scenes by utilizing the coded scene images so as to reduce the scene updating cost; enabling a dynamic self-adaption updated scene to serve as the foundation, enabling the input images to be coded to be selectively adapt to a plurality of scene images or common reference images to serve as reference images for predictive coding; and correspondingly, during decoding, decoding scene updated identification, decoding the scene images according to the decoded scene updated identification, and then decoding video images according to the decoded scene images.
Description
technical field [0001] The present invention relates to a video coding and decoding method based on scene model self-adaptive updating, in particular to dynamically adaptively updating scene images based on code stream size information of video sequences, and then using the updated scene images to complete more efficient predictive coding and decoding. The invention belongs to the video codec technology in the technical field of digital media processing. Background technique [0002] Video coding technology is the key technology of digital video processing. For uncompressed or compressed video files, through high-performance and fast coding algorithms, larger video files can be compressed into smaller binary files. At present, video coding technology has been widely used in many fields, and is experiencing rapid development with each passing day. [0003] The evaluation of video codec performance is determined by the quality of compressed video and the bit rate of compresse...
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IPC IPC(8): H04N19/179H04N19/159
Inventor 黄铁军陈伟田永鸿贾惠柱高文
Owner PEKING UNIV