A conversion quantification method is HEVC video coding and a video coding device

Abstract

The invention relates to a conversion quantification method is HEVC video coding and a video coding device. The method comprises the steps of detecting a residual value of an M*M residual block generated in computing of original image data and interframe forecast image data from a first address; computing an all-zero-block detection threshold value T[M*M] corresponding to the residual value; comparing the computed all-zero-block detection threshold value T[M*M] with an absolute error of the residual value and SAD[M*M]; if SAD[M*M] <T[M*M], the M*M residual block is an all-zero-block, and the residual value of the M*M residual block is subjected to conversion quantization value assignment and then stored at a second address; otherwise, the M*M residual block is not an all-zero-block; the residual value of the M*M residual block is detected from the first address and subjected to conversion quantization operation; and then a conversion quantization value is stored at a second address. During HEVC video coding, the residual value which is the all-zero-block is directly skipped, and no conversion quantization operation is carried out on the all-zero-block, so that the computing complexity degree is lowered; the coding efficiency is raised; and the coding time is reduced.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a method for transform and quantization in HEVC video coding and a video coding device. Background technique [0002] With the popularization of video services, high-resolution videos are more and more widely used, especially at present, high-definition resolution videos and ultra-high-definition resolution videos are beginning to enter network video services. Therefore, high-definition and ultra-high-definition resolution video encoders Become a key device to improve the quality of video services. [0003] Although a series of high-definition video encoders based on hardware encoding chips or semi-hardware embedded systems such as FPGA and DSP have been put into the market, the hardware-based encoding system has a long development cycle, and it is not easy to modify after the product is finalized, and it is not easy to build and distribute. The disadvantages of cod...

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Problems solved by technology

[0005] For the HEVC video coding standard, it has higher compression performance than the H.264 and AVS video coding standards. Relatively greatly improved, the more commonly used methods for improving coding efficiency in the prior art can no longer meet the needs of the HEVC video coding standard, so there is an urgent need to adopt an effective method to reduce the computational complexity in the HEVC coding process and improve coding efficiency

[0006] In the process of coding using the HEVC video coding standard, one of the main factors affecting its coding efficiency is the existence of a large number of all-zero blocks in the process of transform and quantization operations. After the coefficient is zero, such a residual block is called an all-zero block. Obviously, for the all-zero block, the transformation and quantization operations are redundant, due to the computational complexity of the HEVC encoding process itself, and the The redundant transform and quantization operation performed by the zero block will undoubtedly affect its coding efficiency

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