Image analysis – Image enhancement or restoration – Image filter
Reexamination Certificate
2008-09-16
2008-09-16
Couso, Yon J. (Department: 2624)
Image analysis
Image enhancement or restoration
Image filter
C382S233000
Reexamination Certificate
active
10861506
ABSTRACT:
A method and an apparatus of reducing the mosquito noise in a decoded image by using a noise reduction algorism that does not depend on the compression coding algorism applied to the image to be improved. The decoded compression-coded digital image is divided into blocks. The standard deviation or the “variance coefficient” of luminance values is calculated for each block of the decoded compression-coded digital image. An ε matrix for the compression-coded digital image is composed so that all components of each block of the ε matrix is filled with the standard deviations or the variance coefficients for each block. An ε filter is composed so that its ε values are expressed by the ε matrix. The decoded compression-coded digital image is applied to the ε filter to reduce the mosquito noise that arises during decoding process.
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Tsutomu Shohdohji et al.,An Efficient Approach to the Reduction of Mosquito Noise for the JPEG/JPEG2000 Decoded Image by Using Epsilon Filter, IS & T's NIP18: International Conference on Digital Printing Technologies, Sep.29-Oct. 4, 2002, pp. 798-802, w/Partial English Translation.
Tsutomu Shohdohji et al.,Mosquito Noise Reduction Algorithm for Decoded Image, IS & T's NIP19: International Conference on Digital Printing Technologies, Sep. 28-Oct. 3, 2003, pp. 876-879, w/Partial English Translation.
Couso Yon J.
School Foundation of Nippon Institute of Technology
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