Patent ID: 6907143
Filing Date: 2005-06-14
Classification: G06T

Abstract:
1. An adaptive spatio-temporal filter for human vision system models comprising: means for lowpass spatio-temporal filtering with a first bandwidth an input video signal to produce a first filtered output; means for lowpass spatio-temporal filtering with a second bandwidth that spans the first bandwidth the input video signal to produce a second filtered output; means for generating adaptive filter coefficients for both of the lowpass spatio-temporal filtering means as a function of a perceptual parameter of the input video signal, the adaptive filter coefficients being used to control the first and second bandwidths in order to adapt to local and global changes in the perceptual parameter; and means for obtaining a difference between the first and second filtered outputs to produce an output for the adaptive spatio-temporal filter, the difference having a bandpass response for the input video signal calibrated to a perceptual response of the human vision system models.