Intraframe prediction coding optimum mode selecting method and apparatus for video coding

Abstract

The present invention relates to a selecting method for the optimal mode of the intra prediction coding used for video frequency coding, which belongs to the video frequency coding and decoding field. The steps of the method are that a rate-distortion cost function is constructed on the basis of a prediction code rate; the rate-distortion cost of each prediction mode is calculated by the structured function, and the prediction mode with minimum rate-distortion cost is selected as the optimal mode of the intra prediction coding according to the calculating result. Proportionally, the present invention also provides a device for the selecting of intra prediction coding optimal mode of the video frequency coding. The present invention effectively avoids actually coding every blocks during the rate-distortion optimizing process on the basis that the selected mode is closer to the optimal mode of the original rate-distortion optimization model selecting, and greatly improves the coding efficiency on the precondition of ensuring little change on the code rate and the PSNR of the coding and the full searching method.

Description

technical field [0001] The invention relates to the field of video coding and decoding, in particular to a method and device for selecting the best mode of intra-frame prediction coding for video coding. Background technique [0002] The H.264 / AVC video coding standard is the latest developed by the Joint Video Working Group (JVT, Joint Video Team) established by the International Organization for Standardization / International Electrotechnical Commission (ISO / IEC) and the International Telecommunication Union Telecommunication Standardization Sector (ITU-T). Video compression standard. This standard has significantly improved video compression efficiency than all previous video compression standards. In the case of the same peak signal to noise ratio (PSNR, Peak Signal to Noise Ratio) quality, the H.264 / AVC encoder can reduce the bit rate by nearly 50% compared with the MPEG-4 Advanced Simple Profile (ASP, Advance Simple Prome). [0003] In the design of the H.264 / AVC enco...

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Problems solved by technology

[0019] The present invention provides a method and device for selecting the best mode of intra-frame prediction coding for video coding, so as to solve the problem that it is difficult to ensure that the selection of the intra-frame prediction mode is close to the best mode of the original rate-distortion optimization mode selection in the prior art, It is too complicated to calculate the code rate of the block in each prediction mode repeatedly

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