| 摘要 |
<p>A method and system for enhancing image quality of a coded digital video signal representative of a least one frame in a digital video system are provided which comprise the steps of creating a usefulness metric identifying a limit to sharpness enhancement to be applied to the coded digital video signal, defining local spatial features in the frame, and identifying a. frame type for the frame.The usefulness metric is: wherein UME is the usefutlness,metric, q-scale the quantization scale for a macroblock, num&lowbar;bits the number of bits to encode a luminance block, max a function representation a maximum value for the frame, and M and N are scaling factors. The method includes steps of calculating the coding gain of each pixel in the frame based on the local spatial features and the usefulness metric in accordance with the frame type and also includes steps of applying the coding gain to at least one sharpness enhancement algorithm, and generating an enhanced digital video signal by application of the sharpness enhancement algorithm without enhancement encoding artifacts.</p> |
