Image processing apparatus with improved dithering scheme

Details Image processing apparatus with improved dithering scheme Image processing apparatus with improved dithering scheme

1993-05-24

1994-04-26

Couso, Yon J.

Image analysis

Histogram processing

For setting a threshold

382 54, 358461, 358466, 358456, G06K 938

Patent

active

053074262

ABSTRACT:
This invention utilizes the fact that a maximum density difference of pixels in a window within a predetermined range including a pixel of interest is large for a character region, and is small for a photograph region. A maximum density difference of an image within the predetermined region is calculated. A quantization error of pixels around the pixel of interest is calculated, and a correction amount is then calculated by proportionally distributing the quantization error in accordance with a feature amount calculated by a feature amount calculator. The correction amount is added to an image signal of the pixel of interest to form a compensation image signal, and the compensation image signal is quantized.

REFERENCES:
patent: 4958238 (1990-09-01), Katayama et al.
patent: 4975786 (1990-12-01), Katayama et al.
patent: 5060284 (1991-10-01), Klees
patent: 5068746 (1991-11-01), Ohsawa et al.
patent: 5077812 (1991-12-01), Kanno et al.

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