Selective local adaptive wiener filter for video coding and decoding

摘要

An adaptive Wiener filter may be applied to improve coding efficiency because of information lost during quantization of the video encoding process. The Wiener filter may be selectively applied globally to an entire picture or locally to portions of the picture. Histogram segmentation may be used to select pixels for Wiener filtering in some embodiments. The Wiener filter may be adaptively applied to histogram bins, improving coding efficiency in some cases.

主权项

1. A method comprising:
filtering an entire picture; analyzing filter distortion of a plurality of pixels of said picture; binning said pixels based on filter distortion such that each of at least two bins is associated with a different distortion; selecting a different filter for each bin, each filter adapted to the distortion associated with a particular bin and, further, each filter selected based at least in part on the cost of the filter in terms of the number of bits used by a filter coefficient; determining the rate distortion costs of no filtering, global filtering, and histogram segmentation based filtering and selecting the one with the least rate distortion cost; evaluating the efficiency of run length, quad tree and an arithmetic coding; and selectively applying one of run length, quad tree and arithmetic coding based on said evaluation to a filtering flag.