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Estimated spectrum adaptive postfilter and the iterative prepost filtering algirighmsThe invention presents The Estimated Spectrum Adaptive Postfilter (ESAP) and the Iterative Prepost Filter (IPF) algorithms. These algorithms model a number of image-adaptive post-filtering and pre-post filtering methods. They are designed to minimize Discrete Cosine Transform (DCT) blocking distortion caused when images are highly compressed with the Joint Photographic Expert Group (JPEG) standard. The ESAP and the IPF techniques of the present invention minimize the mean square error (MSE) to improve the objective and subjective quality of low-bit-rate JPEG gray-scale images while simultaneously enhancing perceptual visual quality with respect to baseline JPEG images.
Document ID
20080005179
Acquisition Source
Headquarters
Document Type
Other - Patent
Authors
Linares, Irving
Date Acquired
August 24, 2013
Publication Date
July 6, 2004
Subject Category
Instrumentation And Photography
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-6,760,487
Patent Application
US-PATENT-APPL-SN-550254

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