Image analysis – Histogram processing – With a gray-level transformation
Patent
1992-09-28
1997-10-21
Razavi, Michael T.
Image analysis
Histogram processing
With a gray-level transformation
382274, 358458, 358461, G06T 540
Patent
active
056804776
ABSTRACT:
An original image is divided into a plurality of pixel blocks each consisting of a plurality of pixels. A density histogram represented by an electric signal is obtained for each pixel block. Respective pixel blocks are analyzed to find adjacent pixel blocks which are uniform and continuous in density. If the pixel blocks thus found are continuous in density with the reference pixel blocks located at the corner of the original image, the pixel blocks are regarded as those representing the background portion of the original image. The numbers of pixels in the density histogram is corrected for each background pixel block, and highlight and shadow points for determining a gradation curve is determined. The gradation curve is set in a signal-converter to convert an image signal representative of the original image.
REFERENCES:
patent: 4679095 (1987-07-01), Kitamura et al.
patent: 4792979 (1988-12-01), Nomura et al.
patent: 4903145 (1990-02-01), Funada
patent: 4984071 (1991-01-01), Yonezawa
patent: 5046118 (1991-09-01), Ajewole et al.
patent: 5048110 (1991-09-01), Nakajima
patent: 5053888 (1991-10-01), Nomura
patent: 5123060 (1992-06-01), Cho et al.
Chang Jon
Dainippon Screen Mfg. Co,. Ltd.
Razavi Michael T.
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