Image analysis – Image enhancement or restoration – Edge or contour enhancement
Reexamination Certificate
2011-06-21
2011-06-21
Ahmed, Samir A (Department: 2624)
Image analysis
Image enhancement or restoration
Edge or contour enhancement
C382S232000, C382S261000, C382S275000
Reexamination Certificate
active
07965900
ABSTRACT:
In a method for processing an input image to reduce compression-related artifacts, a plurality of block transforms of the input image having respective plurality of block-grid locations are generated, where each of the block-grid locations is shifted with respect to the block-grid locations in each of the other block transformed images. In addition, a plurality of respective intermediate transform domain filtered images having modified transform coefficients are generated. Per-pixel relative weights are assigned to each of the intermediate transform domain filtered images, where each of the intermediate transform domain filtered images has different contexts, and where the per-pixel relative weights are adaptive to the local context in each of the intermediate transform domain filtered images. Moreover, a weighted average of inverse-transforms of the intermediate transform domain filtered images from the per-pixel relative weights to produce an artifact-reduced image is calculated and the artifact-reduced image is outputted.
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Maurer Ron
Staelin Carl
Ahmed Samir A
Hewlett--Packard Development Company, L.P.
Liu Li
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