Image processing method and apparatus

Details Image processing method and apparatus Image processing method and apparatus

1997-09-24

2000-01-04

Boudreau, Leo H.

Image analysis

Image transformation or preprocessing

Changing the image coordinates

382299, 358298, 358456, 358458, G06K 932

Patent

active

060118784

ABSTRACT:
Disclosed are an image processing method and apparatus for applying spatial filtering processing to n-bit multilevel image data, converting the processing image data to two-level or multilevel image data and converting the resulting image data to data capable of being expressed using high-resolution dots. The filtered image data is subjected to a luminance-to-density conversion and is further converted to two or four levels by a four-level/two-level conversion circuit which makes common use of circuitry for executing both two-level error diffusion processing and four-level error diffusion processing. The four-level/two-level conversion circuit clamps the error produced in four-level conversion processing to the number of significant bits of the error produced at execution of the two-level conversion processing. As a result, a common circuit can be used for both the two-level conversion processing and the four-level conversion processing.

REFERENCES:
patent: 5109282 (1992-04-01), Peli
patent: 5689343 (1997-11-01), Loce et al.
patent: 5696853 (1997-12-01), Kawana et al.
patent: 5760922 (1998-06-01), Kojima
patent: 5862305 (1999-01-01), Girmay et al.

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