Patent ID: 8457196
Filing Date: 2013-06-04
Classification: G06T,H04N

Abstract:
1. A method for image visual effect improvement of video encoding and decoding, comprising the following steps at an encoder: extracting image boundary information and enhancing a boundary information, the step further comprising: wherein f(x,y) is a brightness value of the original image at the encoder, γ(f(x,y) is a boundary information extracting function, φ(f(x,y),h(x,y)) is a transformation function selected according to characteristics of the original image and the boundary information; adaptive luminance transforming to improve luminance distribution: wherein g′(x,y) is a transformed brightness value, ψ( adaptively enhancing the chrominance information, which is performed in the UV color space, wherein φ′(u(x,y),v (x,y),α wherein the step of adaptive luminance transforming to improve luminance distribution further comprising following steps: adjusting the threshold according to visual characteristic together with the regional statistical characteristic, and dividing the image into different regions  and adjusting the statistical characteristic threshold P wherein Φ P obtaining parameter values of the transformation function based on the statistical characteristic; (x) is a adjusting function of the parameter α(k) of the transformation function ψ(x,α(k)|k=1, 2, . . . , K);and using brightness transformation function ψ(