Method and system for quantization artifact removal using...

Details Method and system for quantization artifact removal using... Method and system for quantization artifact removal using...

2005-11-01

2009-06-23

Wu, Jingge (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C382S275000

Reexamination Certificate

active

07551795

ABSTRACT:
An image processing method and system removes quantization artifacts in digital video/images. The local neighborhood of the current pixel is segmented based on a pre-defined quantization level to generate a segment containing the current pixel. Then, the luminance values of the pixels within the segment are low-pass filtered. Several sub-gains are computed based on measurements of the segment, and the sub-gains are multiplied together and filtered to obtain a final gain value. The final gain value is used to linearly interpolate between the original luminance value and the filtered luminance value of the pixel to obtain an output luminance value.

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