Image processing apparatus

Details Image processing apparatus Image processing apparatus

1989-05-02

1991-08-13

Herndon, Heather R.

Boots, shoes, and leggings

340703, G06F 1520

Patent

active

050401289

ABSTRACT:
An image processing apparatus reproduces a color image inputted through an input device, such as an image reader. Information regarding separated colors, e.g. yellow, magenta and cyan, of the input color image is binarized and the image is expressed in eight colors (2.sup.3). Color error between quantized output image for the evaluation pixels and quantized input image therefor is calculated on pixel basis for each color component. The color errors for the evaluation pixels are weighted in accordance with a predetermined weighting matrix, and the quantizing value for a pixel in question is determined so that the sum of the weighted color errors and the color error of the pixel in question become minimal. Hence, the output image is reproduced in a color close to that of the input image.

REFERENCES:
patent: 4743959 (1988-05-01), Frederiksen
patent: 4745467 (1988-05-01), Sekizawa
"Computer Graphics and Image Processing" 5, 13.varies.40 (1976), pp. 13-40, 1976. A Survey of Techniques for the Display of Continuous Tone Pictures on Bilevel Displays.

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