Method and apparatus for blocking effect reduction

Details Method and apparatus for blocking effect reduction Method and apparatus for blocking effect reduction

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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