Reducing noise and artifacts in an image

Details Reducing noise and artifacts in an image Reducing noise and artifacts in an image

2011-01-11

2011-01-11

Ometz, David L (Department: 2622)

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

C348S607000, C348S666000, C348S701000, C348S631000, C348S627000

Reexamination Certificate

active

07868950

ABSTRACT:
In a method of processing an input image, compression parameters of the input image are determined and luminance artifacts in the input image are reduced to obtain an improved luminance component of the input image, where the determined compression parameters guide the luminance artifact reduction. In addition, a chrominance noise and chrominance artifact level of the input image is estimated and a spatially-correlated chrominance noise and chrominance artifact of the input image is reduced with the improved luminance component, where the estimated chrominance noise and chrominance artifact level guide the spatially-correlated chrominance noise and chrominance artifact reduction to obtain an improved chrominance component of the input image. Moreover, an output image having the improved luminance component and the improved chrominance component is outputted.

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Samadani, R., “Characterizing and Estimating Block DCT Image Compression Quantization Parameters”, HP Laboratories Palo Alto, HPL-2005-190, Oct. 20, 2005 Internal Accession Date.
Samadani, R. et al., “Deringing and Deblocking DCT Compression Artifacts with Efficient Shifted Transforms”, HP Labs Palo Alto, Imaging Technologies Dept., downloaded Apr. 17, 2006.
Tomasi, C., et al., “Bilateral Filtering for Gray and Color Images”, downloaded Apr. 17, 2006.

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