Video sequence coding method aiming at HEVC (High Efficiency Video Coding)

Abstract

The invention relates to a video sequence coding method aiming at HEVC (High Efficiency Video Coding), and the method is good in compaction effect, low in complexity and suitable for practical application. The video sequence coding method comprises the following steps of: (1) obtaining a prediction block according to the brightness component of a PU (Prediction Unit), subtracting an original value to obtain residual, and dividing based on the rate-distortion cost to obtain a TU (Transformation Unit); (2) determining whether the current TU selects to transform or not according to the minimum rate-distortion cost principle; (3) quantizing by utilizing a relative method, and transmitting marks of a quantization coefficient and transformation or non-transformation to a decoding end; (4) reading out the marks and judging whether inverse transformation is executed or not at the decoding end by each TU; (5) executing corresponding inverse quantization according to the read marks by each TU; (6) deciding whether the inverse transformation is executed according to the read marks, and executing corresponding operations; and (7) combining TUs to be the PU, and adding the PU with a prediction value, obtained through motion compensation, of the current PU to obtain a reconfiguration value of the PU so as to reconfigure a current CU (Coding Unit).

Description

technical field [0001] The present invention belongs to the technical field of video coding, and in particular relates to a video sequence coding method oriented to HEVC (High efficiency video coding, high efficiency video coding). Background technique [0002] The application of H.264 (or called AVC) is very mature. From video surveillance to streaming media to personal consumer electronics, the H.264 video codec standard has been adopted. H.265 (or HEVC) is currently in the process of standard formulation. HEVC is a more efficient coding standard than H.264, formulated by JCT-VC (A Joint Collaborative Team on Video Coding), with the goal of reducing the bit rate to 50% of H.264 under the same video quality (PSNR). This is a very impressive indicator. If this goal can be achieved, the bandwidth requirements for high-definition transmission will be further reduced. Of course, the complexity of HEVC will also be greatly increased, which may be more than three times that of H...

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Problems solved by technology

[0004] In the transformation coding part in HEVC, each transformation unit performs 2-dimensional DCT transformation, and the size is from 8×8 to 32×32, but some image blocks, such as mixed images or some sparse images, are not suitable for the process of transformation coding

"Enable efficient compound image compression in H.264 / AVC intra coding" (Proc.Int.Conf.Image Processing, Oct.2007, vol.2, pp.337-340) proposes to skip the transform coding process for some image blocks , let it adaptively choose whether to use transform coding, but it is only applied to intra-frame coding, and the compression effect is not very good

"Transform skip mode" (JCT-VC G575, 7th Meeting: Geneva, CH, 21-30November, 2011) proposes to use two-dimensional transformation, one-dimensional transformation and non-transformation methods for an image block, but the complexity of this method Extremely high, not suitable for practical applications

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