NDLI: Noise estimation for blocking artifacts reduction in DCT coded images

Content Provider	IEEE Xplore Digital Library
Author	Jeonghun Yang Hyuk Choi Taejeong Kim
Copyright Year	1991
Abstract	This paper proposes a postprocessing algorithm that can reduce the blocking artifacts in discrete cosine transform (DCT) coded images. To analyze blocking artifacts as noise components residing across two neighboring blocks, we use 1-D pixel vectors made of pixel rows or columns across two neighboring blocks. We model the blocky noise in each pixel vector as a shape vector weighted by the boundary discontinuity. The boundary discontinuity of each vector is estimated from the difference between the pixel gradient across the block boundary and that of the internal pixels. We make minimum mean squared error (MMSE) estimates of the shape vectors, indexed by the local image activity, based on the noise statistics prior to postprocessing. Once the estimated shape vectors are stored in the decoder, the proposed algorithm eliminates the noise components by simply subtracting from each pixel vector an appropriate shape vector multiplied by the boundary discontinuity. The experimental results show that the proposed algorithm is highly effective in reducing blocking artifacts in both subjective and objective viewpoints, at low computational burden.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	1116
Ending Page	1120
Page Count	5
File Size	1222738
File Format	PDF
ISSN	10518215
Volume Number	10
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Noise reduction Discrete cosine transforms Shape Multi-stage noise shaping Noise shaping Decoding Image coding Low pass filters Filtering Error analysis
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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