Tfi Digital Media Limited

Shiqi Wang

Hon Wah Wong

Sam Tak Wu Kwong

Chi Keung Fong

Yiu Fai Yuen

Mingliang Zhou

Hok Kwan Cheung

Hon Tung Luk

Xuekai Wei

A method for video coding with global rate-distortion optimization-based rate control (RC) is provided. By using this video coding method, an RC scheme for High dynamic range (HDR) in High Efficiency Video Coding (HEVC) is provided. Briefly, considering the characteristics of HDR image content, a rate-distortion (R-D) model based on HDR-Visual Difference Predictor (VDP)-2 for performance optimization is provided. In the optimization process, the &#x3bb; is directly utilized rather than the bit rate to obtain the globally optimal solution. Finally, the model parameter estimation method is used to reduce errors. The video coding method of the present invention is verified that bit rate reduction on average can be achieved.

Method based on global rate-distortion optimization for rate control in video coding

A method based on CTU level rate-distortion optimization for rate control in video coding which can effectively improve the perceptual rate-distortion performance and coding efficiency is provided. Firstly, a perceptual rate-distortion model is established using a divisive normalization framework, which characterizes the relationship between local visual quality and coding bits. Subsequently, the established perceptual rate-distortion model is applied to overall distortion optimization which is transformed into a global optimization problem and solved with convex optimization algorithms to obtain optimal CTU level coding bit allocation.

Method based on coding tree unit level rate-distortion optimization for rate control in video coding

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Hong Kong, China

Shiqi Wang