Image processing apparatus

Details Image processing apparatus Image processing apparatus

1995-06-02

1996-11-19

Boudreau, Leo

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

382272, 382252, 358466, G06K 938

Patent

active

055771360

ABSTRACT:
There is disclosed an image processing apparatus for intermediate tone processing of an image signal into a binary signal, capable of providing a reproduced image with excellent resolution and gradation with a simple structure, and without the periodic texture inherent to the conventional error dispersing method or average density conserving method. The disclosed apparatus determines the average density of an already binarized predetermined image area, binary digitizing the image signal of a contemplated pixel, utilizing the determined average density as the threshold value, and distributing the error, generated in the binary digitization, to the image data of plural pixels to be digitized thereafter with certain distribution factors. The distribution factors are randomly changed according to random numbers generated by a generator, so that the reproduced image is free from periodic patterns resulting from periodic distributions of the errors.

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