Bit rate estimation method of SAO mode decision applied to encoder of HEVC standard

Abstract

The invention belongs to the technical field of high-definition digital video compression coding and decoding, and particularly relates to a bit rate estimation method of SAO mode decision applied to an encoder of the HEVC standard. A few statistical information is obtained according to a formula, then four offsets of a luminance component Y of a current block image in the SAO mode decision under 5 ED modes, namely 20 offsets, are obtained in total, and a chrominance component Cb and a chrominance component Cr which correspond to the Y respectively have 4 offsets under the EO modes. Distortion means distortion, lambda stands for a constant coefficient, Bitrate serves as a bit rate, and Cost is a cost value under a certain mode. According to the bit rate estimation method, bit rate estimation of the mode decision in an SAO module can be quickly carried out, hardware expenditure is reduced, meanwhile operating frequency of hardware can be obviously improved, and thus real-time coding of high-definition videos can be achieved.

Description

technical field [0001] The invention belongs to the technical field of high-definition digital video compression encoding and decoding, and is aimed at the HEVC video encoding and decoding standard, and specifically relates to a bit rate estimation method for mode judgment of an SAO module in a video encoder, which is applicable to the HEVC video encoding standard. Background technique [0002] HEVC (High Efficiency Video Coding) is a next-generation video codec standard proposed by JCTVC, an organization jointly established by the International Telecommunications Organization (ITU) and the Motion Picture Experts Group (MPEG). The goal is to double the compression rate compared to the previous generation standard H.264 / AVC under the premise of the same visual effect. [0003] HEVC-based video encoder, its structure diagram is as follows figure 1 As shown, it is mainly composed of the following modules: intra prediction, inter prediction, transformation, quantization, invers...

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Problems solved by technology

[0006] When the module makes a mode decision, it needs to calculate the value of the bit rate that needs to be transmitted in this mode. In the official reference software HM9.0 of HEVC, the value of the bit rate needs to be calculated by the CABAC encoder, and this step In hardware design, it is a process that consumes time and chip area, and at the same time limits the operating frequency of the chip.

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