Image forming apparatus having a noise removing unit

Details Image forming apparatus having a noise removing unit Image forming apparatus having a noise removing unit

1997-03-06

2000-02-22

Lee, Thomas D.

Image analysis

Color image processing

382167, 358530, G06K 940

Patent

active

060289570

ABSTRACT:
Pixel data comprising density data of R, G, and B obtained by reading an original with a CCD image sensor are subjected to shading correction by a shading correction unit, and then converted into color region signals H*, V, and C* in the Munsell color space by a first converter. According to the variations of V, a region discriminator determines whether each pixel data belongs to an edge portion of the original image or whether it belongs to a uniform density region of the original image. A noise removing unit performs noise removal by performing smoothing on color region signals H*, V, and C* of the pixel data which have been determined to belong to uniform density regions. A second converter converts the noise-removed color region signals into pixel data of R, G, and B.

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patent: 5563726 (1996-10-01), Suzuki et al.
patent: 5689590 (1997-11-01), Shirasawa et al.

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