A filter reduces artifacts, such as grid noise and staircase noise, in block-coded digital images with image block boundaries. The type of filtering is determined after an estimation of the image global metrics and local metrics. For areas of the image near grid noise, the filter performs low pass filtering....http://www.google.fr/patents/US6600839?utm_source=gb-gplus-shareBrevet US6600839 - Non-linear adaptive image filter for filtering noise such as blocking artifacts
Non-linear adaptive image filter for filtering noise such as blocking artifacts
