Image analysis – Color image processing – Color correction
Patent
1997-07-23
1998-08-11
Couso, Yon J.
Image analysis
Color image processing
Color correction
382263, G06K 900
Patent
active
057938857
ABSTRACT:
A computationally efficient system spatially filters a digital input image to sharpen the image. A process is disclosed to spatially filter pixels of an RGB image by applying a high pass filter to the image. First, signals representative of luminance are extracted from the input image. Then, the extracted luminance signals are filtered. Quotient signals are then developed, representing the ratio between each filtered luminance signal and the corresponding original luminance signal. Quotient signals are multiplied by the corresponding pixels of each plane of the original image to provide an output image. The invention may also be embodied by an image editor to implement the spatial filtering process of the invention, where the image editor includes stored programming instructions executed by a processor, discrete circuit components, an ASIC, or another suitable hardware device.
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Couso Yon J.
International Business Machines - Corporation
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