Image analysis – Image compression or coding – Substantial processing of image in compressed form
Reexamination Certificate
2005-05-24
2005-05-24
Chang, Jon (Department: 2623)
Image analysis
Image compression or coding
Substantial processing of image in compressed form
C382S251000, C375S240260
Reexamination Certificate
active
06898321
ABSTRACT:
By utilizing parameters derivable from a compressed bit-stream, measures are obtained of the subjective quality of a decoded picture, without the necessity for reference to source material. A blockiness measure is derived both locally and globally and used to control a de-blocking filter. An estimate of signal-to-noise ratio is derived from quantization values.
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Diggins Jonathan
Knee Michael James
Chang Jon
Michael Best & Friedrich
Snell & Wilcox Limited
Tucker Wesley
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