Apparatus and method of block noise detection and reduction

Details Apparatus and method of block noise detection and reduction Apparatus and method of block noise detection and reduction

2005-12-13

2005-12-13

Mancuso, Joseph (Department: 2621)

Image analysis

Image enhancement or restoration

Edge or contour enhancement

C375S240270

Reexamination Certificate

active

06975777

ABSTRACT:
Block noises generated on an input video signal that has been coded and decoded per pixel block are detected. The input video signal is differentiated per pixel to obtain a differentiated signal. Impulses of the differentiated signal are detected to obtain a detection signal carrying the impulses. The detection signal is integrated and compared with a reference signal to determine whether the block noise is generated on the input video signal. For noise reduction, the detection signal is filtered to obtain a corrected signal. The input video signal is delayed by a predetermined period. The correction signal is added to the delayed video signal to cancel the difference in signal level on the boundary between a first pixel block on which a block noise is generated and a second block adjacent to the first pixel block of the input video signal.

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