Image analysis – Image transformation or preprocessing – Changing the image coordinates
Reexamination Certificate
2011-01-04
2011-01-04
Couso, Yon (Department: 2624)
Image analysis
Image transformation or preprocessing
Changing the image coordinates
C382S260000
Reexamination Certificate
active
07865040
ABSTRACT:
One embodiment of the present invention provides a system that uses nonlinear filtering while resizing an image to preserve sharp detail. The system starts with an original image, which is a digital image comprised of a plurality of pixels. Next, the system resizes the original image. This involves first producing an initial resized image by using neighboring pixel values in the original image (or a conventional resizing operation) to produce initial values for subpixel locations in the original image. The system then applies a nonlinear filter using pixel values in the original and initial resized images to produce a resized output image. When this nonlinear filter updates pixel values, it weights the contributions of neighboring pixels nonlinearly. This non-linear weighting of neighboring pixels can be used to significantly reduce (or eliminate) the mixing pixel values from both sides of a sharp edge caused by conventional linear filters, and can thereby alleviate the problem of blurring sharp edges during image resizing operations.
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Adobe Systems Incorporated
Couso Yon
Kowert Robert C.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
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