Improved transformation coefficient sign data hiding method based on recovered transformation coefficient

A technology for transforming coefficients and sign bits, applied in the field of video decoding, can solve the problems of reducing the video encoding bit rate, loss of video encoding quality, etc., to achieve the effect of improving video encoding performance, reducing video quality loss, and reducing video encoding bit rate

Active Publication Date: 2016-08-24
XIDIAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide an improved transform coefficient sign bit hiding method based on restoring transform coefficients, aiming to solve the problem that the SDH technology reduces the video coding rate and also loses the video coding quality

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  • Improved transformation coefficient sign data hiding method based on recovered transformation coefficient
  • Improved transformation coefficient sign data hiding method based on recovered transformation coefficient
  • Improved transformation coefficient sign data hiding method based on recovered transformation coefficient

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[0018] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] like figure 1 Shown: the improved transform coefficient sign bit hiding method based on restored transform coefficients in the embodiment of the present invention, the quantized transform coefficients are divided into multiple 4×4 transform coefficient matrices CG, the improved transform coefficient sign bit hiding technology based on restored transform coefficients Include the following steps:

[0021] S101: Determine the positions of the first and last non-zero transform coe...

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Abstract

The invention discloses an improved transformation coefficient sign data hiding (SDH) method based on a recovered transformation coefficient. The improved transformation coefficient sign data hiding method based on a recovered transformation coefficient adopts the parity of the sum of the amplitudes of the first non-zero transformation coefficient and the last non-zero transformation coefficient of a 4*4 transformation coefficient matrix CG to express the sign of the last non-zero transformation coefficient, thus obtaining a coefficient sign; and if the obtained coefficient sign does not accord with the practical coefficient sign, the amplitudes of two transformation coefficients are adjusted according to rate distortion optimization quantification (RDOQ) criteria. By adopting the method, the code of the last non-zero transformation coefficient sign in the CG can be omitted, so that the bit number of code sign data is reduced; the method can be compatible with the SDH technology, so that the loss of the SDH technology on video coding quality in lossy coding is relieved to a certain degree, and the coding performance is effectively improved; and the method is very low in complexity, and is applicable to various video resolutions.

Description

technical field [0001] The invention belongs to the technical field of video decoding, in particular to an improved transformation coefficient sign bit hiding method based on restoring transformation coefficients. Background technique [0002] As the spatial resolution of video is fully upgraded from standard definition (640×480, 720×576) to high definition (720P, 1080P), and even digital video formats of 4K×2K and 8K×4K appear in some video application fields, the video temporal resolution, namely The frame rate is also changing from 30 frames per second to 60 frames per second, and video applications are increasingly limited by traditional video codec technology. In order to adapt to technological development trends and changes in demand, the video coding joint working group JCT-VC officially released a new generation of high-efficiency video coding standard HEVC / H.265 in 2013. Compared with the previous generation of video compression standard H.264 / AVC, video coding rat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/122H04N19/124H04N19/13H04N19/147H04N19/18
CPCH04N19/122H04N19/124H04N19/13H04N19/147H04N19/18
Inventor 宋锐袁野清贾媛李云松王养利赵园伟
Owner XIDIAN UNIV
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