Image analysis – Image compression or coding – Adaptive coding
Reexamination Certificate
2006-01-17
2006-01-17
Johns, Andrew W. (Department: 2621)
Image analysis
Image compression or coding
Adaptive coding
C382S251000
Reexamination Certificate
active
06987889
ABSTRACT:
The present invention allows higher quality video images to be transmitted without a concomitant increase in a total number of video data bits transmitted per frame. Quantization parameters are applied to coefficients of macroblocks within a given video frame. A lower value of the quantization parameter is applied near a central region of a video frame. This central region is referred to as a prime video region. Applying the lower quantization parameter to the prime video region has the effect of increasing the video data bit density within that area. Outside of the prime video region, the video data bit density per macroblock is decreased so as to have a zero net-gain in bit density over the entire video frame. Furthermore, there may be a plurality of prime video regions where quantization parameters are dynamically coded. In this case, the value of the quantization parameter will increase or decrease within a given prime video region based on a relative importance of a particular prime video region. Consequently, a quantization parameter matrix may vary depending on the video scene.
REFERENCES:
patent: 5488665 (1996-01-01), Johnston et al.
patent: 6043844 (2000-03-01), Bist et al.
patent: 6246345 (2001-06-01), Davidson et al.
patent: 6314208 (2001-11-01), Konstantinides et al.
patent: 6363338 (2002-03-01), Ubale et al.
patent: 6366705 (2002-04-01), Chiu et al.
patent: 6499010 (2002-12-01), Faller
patent: 6864909 (2005-03-01), Horowitz
patent: 2001/0043754 (2001-11-01), Memon et al.
Alavi Amir
Johns Andrew W.
Polycom, Inc.
Wong Cabello Lutsch Rutherford & Brucculeri LLP
LandOfFree
System and method for dynamic perceptual coding of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for dynamic perceptual coding of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for dynamic perceptual coding of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3604186