Noise estimation and reduction apparatus for video signal processing

摘要

Video signal compression apparatus provides a means for generating residues (12,16,17,18,14) representing pixel value differences between predicted and real pixel values of a current frame of a video signal. Noise reduction circuitry, in the form of nonlinear processing means (500), attenuates lower amplitude residues greater than higher amplitude residues and is responsive to a noise estimate (1333). The processed residues are transformed (15) to provide a compressed video data output. Disclosed nonlinear processing functions attenuate noise and reduce image distortion.