Method and device for lossy encoding data and corresponding device for reconstructing data

摘要

The invention proposes modification of quantized coefficients for signalling of a post-processing method. Therefore, it is proposed a method for lossy compress-encoding data comprising at least one of image data and audio data. Said method comprises determining quantized coefficients using a quantization of a discrete cosine transformed residual of a prediction of said data. Said method further comprises modifying said quantized coefficients for minimizing rate-distortion cost wherein distortion is determined using a post-processed reconstruction of the data, the post-processed reconstruction being post-processed according to a postprocessing method, and compress-encoding said modified coefficients. In said proposed method, the post-processing method is that one of n>1 different predetermined post processing method candidates whose position in an predetermined order of arrangement of the post processing method candidates equals a remainder of division, by n, of a sum of the modified coefficients. Doing so removes the overhead of flags in the bit stream.

主权项

1. A method for lossy encoding data having at least one of image data or audio data, said method comprising:
determining quantized coefficients using a quantization of a discrete cosine transformed residual of a prediction of said data; modifying said quantized coefficients for minimizing a rate-distortion cost, wherein distortion is determined using a post-processed reconstruction of the data, the post-processed reconstruction being post-processed according to a post-processing method; and encoding said modified quantized coefficients; wherein the post-processing method is that one of n>1 different given post processing method candidates whose position in an given order of arrangement of the post processing method candidates equals a remainder of division, by n, of a sum of the modified coefficients.