Image processing apparatus

Details Image processing apparatus Image processing apparatus

1990-08-27

1991-12-31

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

3582612, 358466, G06R 938

Patent

active

050778129

ABSTRACT:
An image processing apparatus including an input circuit for receiving image data, a binarizing unit for binarizing a subject pixel of the image data supplied from the input circuit, an error detector for detecting an error between a binarized image data obtained by the binarizing unit and the image data supplied from the input circuit, an error diffusing circuit for diffusing the error on other image data associated with other pixels around the subject pixel, a compensating unit for compensating the image data of the subject pixel by using a compensation data which is caused by a previous error diffusion of the error diffusing circuit, a circuit for detecting an image density of the image data for a prescribed image area surrounding the subject pixel and a controller for controlling the compensating unit in response to the image density detected by the image density detecting circuit.

REFERENCES:
patent: 4668995 (1987-05-01), Chen et al.
patent: 4876610 (1989-10-01), Ohsawa et al.
patent: 4955065 (1990-09-01), Ulichney
patent: 4958238 (1990-09-01), Katayama et al.
patent: 4975786 (1990-12-01), Katayama et al.
Floyd and Steinberg, An Adaptive Algorithm for Spatial Greyscale, Proceeding of the S.I.D., vol. 17/2, Second Quarter, 1976, pp. 75-77.

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