| 摘要 |
A method for direct mode enhancement in B-pictures and skip mode enhancement in P-pictures in the framework of H.264 (MPEG-4/Part 10) is disclosed. Direct mode and skip mode enhancements are achieved by clustering the values of the Lagrangian, removing outliers and specifying smaller values of the Lagrangian multiplier in the rate-distortion optimization for encoding mode selection. In relationship to the existing rate-distortion optimization methods currently employed in the MPEG-4/Part 10 encoder, this method represents a simple and useful add-on. When other solutions such as further increasing the values of the quantization parameter are not applicable, as inadmissible artifacts would be introduced in the decoded pictures, this method achieves bit rate reduction without introducing visible distortion in the decoded sequences. This method is applicable in any video encoding system that employs rate-distortion optimization for encoding mode selection. |
