Adaptive spatio-temporal filter for human vision system models

Details Adaptive spatio-temporal filter for human vision system models Adaptive spatio-temporal filter for human vision system models

2005-06-14

2005-06-14

Miriam, Daniel (Department: 2621)

Image analysis

Image enhancement or restoration

Image filter

C382S264000

Reexamination Certificate

active

06907143

ABSTRACT:
An adaptive spatio-temporal filter for use in video quality of service instruments based on human vision system models has a pair of parallel, lowpass, spatio-temporal filters receiving a common video input signal. The outputs from the pair of lowpass spatio-temporal filters are differenced to produce the output of the adaptive spatio-temporal filter, with the bandwidths of the pair being such as to produce an overall bandpass response. A filter adaptation controller generates adaptive filter coefficients for each pixel processed based on a perceptual parameter, such as the local average luminance, contrast, etc., of either the input video signal or the output of one of the pair of lowpass spatio-temporal filters. Each of the pair of lowpass spatio-temporal filters has a temporal IIR filter in cascade with a 2-D spatial IIR filter, and each individual filter is composed of a common building block,5 i.e., a first order, unity DC gain, tunable lowpass filter having a topology suitable for IC implementation. At least two of the building blocks make up each filter with the overall adaptive spatio-temporal filter response having a linear portion and a non-linear portion, the linear portion being dominant at low luminance levels and the non-linear portion being consistent with enhanced perceived brightness as the luminance level increases.

REFERENCES:
patent: 4551753 (1985-11-01), Nishizawa et al.
patent: 5394483 (1995-02-01), Daly
patent: 5473384 (1995-12-01), Jayant et al.
patent: 5687101 (1997-11-01), Lee
patent: 5799111 (1998-08-01), Guissin
patent: 6119083 (2000-09-01), Hollier et al.
patent: 6281942 (2001-08-01), Wang
patent: 6335990 (2002-01-01), Chen et al.
patent: 07307925 (1995-11-01), None
T. Hamada, S. Miyaji and S. Matsumoto, “Picture Quality Assessment System by Three-Layered Bottom-Up Noise Weighting Considering Human Visual Perception”, SMPTE Journal, Jan. 1999.

Affiliated with

Also associated with

Rating

Adaptive spatio-temporal filter for human vision system models does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive spatio-temporal filter for human vision system models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive spatio-temporal filter for human vision system models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3501495