Rate distortion optimizing method
A rate-distortion optimization and rate-distortion technology, which is applied in the field of image/video encoding and decoding, and can solve problems such as the inability of adaptive optimization of video content.
Active Publication Date: 2014-12-31
广东广晟研究开发院有限公司
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[0009] The technical problem to be solved by the present invention is that, aiming at the defect that the rate-distortion optimization method in the prior art cannot adaptively optimize the video content, it provides a method that integrates the rate-distortion optimization at the frame layer and the rate-distortion optimization at the basic coding unit layer. , a rate-distortion optimization method that achieves the best rate-distortion optimization for video content
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[0063] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0064] Please refer to figure 1 , figure 1 It is a flow chart of the first preferred embodiment of the rate-distortion optimization method of the present invention. The rate-distortion optimization method starts with:
[0065] Step 101, obtaining the block layer Lagrangian parameters of each basic coding unit in the current frame and the frame layer Lagrangian parameters of the current frame;
[0066] Step 102, according to the block-level Lagrangian parameters of the basic coding unit and the frame-level Lagrangian parameters of the current frame, obtain the final Lagrangian parameters of each ...
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The invention relates to a rate distortion optimizing method. The rate distortion optimizing method includes steps of acquiring Lagrange parameters of a block layer of each basic code unit in a current frame and Lagrange parameters of a frame layer of the current frame; acquiring the final Lagrange parameters of each basic code unit of the current frame according to the Lagrange parameters of the block layer and the Lagrange parameters of the frame layer; subjecting each basic code unit in the current frame to rate distortion optimizing coding to obtain code rate value and distortion value of each basic code unit in the current frame and further obtain code rate value and distortion value of the current frame; building a rate distortion model of the frame layer according to the code rate values and the distortion values of at least two basic code unit in the current frame, and estimating Lagrange parameters of the frame layer of the next frame according to the rate distortion model of the frame layer and the code rate value and the distortion value of the current frame. By the aid of the rate distortion optimization of the comprehensive frame layer and the rate distortion optimization of the basic code units, the optimum rate distortion optimization of videos is realized.
Description
technical field [0001] The present invention relates to the field of image / video encoding and decoding, and more specifically relates to a rate-distortion optimization method. Background technique [0002] Using the international standard H264 as a reference, different encoding modes can be selected when encoding the basic coding unit. The selection of the encoding mode includes the selection of the intra-frame prediction method or the inter-frame prediction method, and may also include the division method of the basic coding unit (for example, INTRA-4x4, INTRA-8x8, INTRA-16x16, SKIP, DIRECT, INTER-16x16, INTER-16x8, INTER-8x16, INTER-8x8, INTER-8x8 can be further divided into INTER-8x8, INTER-8x4, INTER-4x8, INTER-4x4) selection, can also include the prediction block position (eg Intra_4x4_Vertical, Intra_4x4_Horizontal, Intra_4x4_Diagonal_Down_Left, Intra_4x4_Diagonal_Down_Right, Intra4x4_Vertical_Right, Intra_4x4_Hori_zontal_Down, Intra_4x4_Vertical_Left, Intra_4x4_Horiz...
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IPC IPC(8): H04N19/147H04N19/19H04N19/61
Inventor 刘伟杰徐茂何辉
Owner 广东广晟研究开发院有限公司