A Coefficient-Level Adaptive Quantization Method

Abstract

The present invention discloses a coefficient-level adaptive quantization method, characterized in including the steps of: predicting that the distribution of transform coefficients obtained after residual data is transformed has a certain characteristic which determines different importance of different coefficients; scanning coefficients in transform blocks using a transform coefficient scanning method; performing distinguishing quantization on the coefficients in the blocks in sequence in this scanning order, specifically, indirectly changing quantization parameters by assigning weights to quantization multiplier factors; and continuously attenuating the weights using Gaussian functions, so that the steepness can also be controlled. Meanwhile, a corresponding modification is made at the inverse quantization part. The method discloses by the present invention is specific to coefficient-level quantization, also has an adaptive characteristic, enables the residual to be fully compressed, is a coefficient-level adaptive quantization method capable of finely controlling quantization, and solves the problem that the current block-level quantization method cannot be adapted to coarse quantization and fine quantization because of neglecting the difference of the contribution of different transform coefficients in a transform unit (TU).

Description

technical field [0001] The invention relates to the technical field of high-definition video processing, in particular to a coefficient-level adaptive quantization method. Background technique [0002] Vision is the most important way for humans to perceive the world, and video plays a key role in various vision-related applications. However, video is an information carrier with a huge amount of data. If it wants to be used in practice, it must adopt efficient data compression and coding. Following the H.264 / AVC video coding standard, VCEG and MPEG formed a Joint Collaboration Team on Video Coding (JCT-VC) to formulate a new generation of high-performance video coding standard: HEVC (High Efficiency Video Coding) . Compared with the previous generation of video standards, HEVC saves 50% bit rate under the same video quality. [0003] HEVC follows the previous prediction-transform hybrid coding framework, including modules such as intra-frame prediction, inter-frame predic...

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Problems solved by technology

[0006] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a coefficient-level adaptive quantization method, which is different from block-level quantization, and the present invention is specific to the transform coefficients in a block, and the method can be adaptive to important Different transform coefficients with different characteristics are quantized differently, which is a more effective quantization, which improves the performance of video coding and solves the problem that the current block-level quantization method ignores the difference in the contribution of different transform coefficients in the TU, and cannot adapt to coarse quantization and fine quantization. The problem

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