Block noise detector and detection method, and block noise...

Details Block noise detector and detection method, and block noise... Block noise detector and detection method, and block noise...

2011-07-26

2011-07-26

Patel, Kanji (Department: 2624)

Image analysis

Image enhancement or restoration

Artifact removal or suppression

C358S003270, C375S254000

Reexamination Certificate

active

07986855

ABSTRACT:
A block noise detector has a spatial difference calculator that calculates differences between values of adjacent pixels. A spatial difference comparator detects edges by comparing the calculated differences. Eight counters count edges detected at different groups of positions spaced eight pixels apart in each horizontal line. The maximum count and the group of positions at which it occurs are detected at the end of each horizontal line to detect block noise and the positions of the block boundaries. The block noise detector is small in size because it only has to count edges in one line at a time, and detects edges accurately by comparing the difference at a given position separately with differences to the left and differences to the right.

REFERENCES:
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patent: 6738528 (2004-05-01), Nio et al.
patent: 7397457 (2008-07-01), Sugino et al.
patent: 7538824 (2009-05-01), Pillay et al.
patent: 7668392 (2010-02-01), Yamada et al.
patent: WO-2005/004489 (2005-01-01), None

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