Digital image noise reduction of luminance and chrominance based

Details Digital image noise reduction of luminance and chrominance based Digital image noise reduction of luminance and chrominance based

1991-10-23

1996-10-08

Boudreau, Leo

Image analysis

Image enhancement or restoration

Edge or contour enhancement

382275, 358463, G06K 940

Patent

active

055639631

ABSTRACT:
The present invention reduces noise in digital photographic images based on the assumption that images may be decomposed into two types of regions, smooth regions and edge regions. Smooth regions are areas of the image lacking any sharp detail, such as blue sky. Edge regions are regions containing sharp detail, such as edges and textured regions (such as grass). The present method reduces noise in the smooth regions by a mathematical blurring technique based on least squares regression. The blurring does not degrade the sharpness of the image, because there are no sharp details in the smooth regions. Edge regions are left undisturbed to maintain sharpness, but the noise is less noticeable in those regions than in the smooth regions. The method operates upon the luminance and chrominance component of a digital image.

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