Image analysis – Image compression or coding – Including details of decompression
Patent
1993-04-08
1995-09-26
Boudreau, Leo H.
Image analysis
Image compression or coding
Including details of decompression
358456, 382266, G06K 900
Patent
active
054540526
ABSTRACT:
The edge feature value of a M-valued original image is detected and converted to an N-valued image (where M>N) using an error diffusion method while suppressing the quantization error in edge areas of the image by edge area enhancement. The N-valued image data is scanned with a edge feature value detection filter to detect feature quantities and is scanned by plural spatial filters with different smoothing characteristics to normalize the output value of each spatial filter to a specific value. The normalized outputs of the spatial filters are weighted with a weighting coefficient based on the edge feature value to generate the interpolated image data, and the resulting image is normalized to L-valued image data (where N<L). The mixing ratio and image quality are also controlled by manipulating the edge feature value and weighting coefficients.
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Boudreau Leo H.
Matsushita Electric - Industrial Co., Ltd.
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