Method and apparatus for reduction mosquito noise in decoded images

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 t...

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Bibliographic Details
Main Author SHOHDOHJI TSUTOMU
Format Patent
LanguageEnglish
Published 16.09.2008
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
HANDLING RECORD CARRIERS
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary: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 epsilon matrix for the compression-coded digital image is composed so that all components of each block of the epsilon matrix is filled with the standard deviations or the variance coefficients for each block. An epsilon filter is composed so that its epsilon values are expressed by the epsilon matrix. The decoded compression-coded digital image is applied to the epsilon filter to reduce the mosquito noise that arises during decoding process.
Bibliography:Application Number: US20040861506