NDLI: Subband image compression using wavelet transform and vector quantization

Content Provider	IEEE Xplore Digital Library
Author	El-Sharkawy, M.A. White, C.A. Gundrum, H.
Copyright Year	1996
Description	Author affiliation: Dept. of Electr. Eng., Purdue Univ., Indianapolis, IN, USA (El-Sharkawy, M.A.)
Abstract	The Discrete Wavelet Transform (DWT) has many useful properties when applied to image compression. The multiresolutional decomposition is of complexity O(n) and conserves the geometric image structure within each subband. A tree-structured coding scheme can efficiently exploit the inherent correlation in the subband representation. An algorithm is introduced which incorporates a fast tree-structured quantization scheme and partial search vector quantization. The algorithm described in this paper is a novel quantization thresholding scheme which uses the DWT to decompose an image into octave wide frequency bands, then quantizes the coefficients using a "look ahead" measurement of the image based on the low frequency sub-image inherent in the DWT. This algorithm then uses vector quantization to code the thresholded coefficients of the decomposed image. A partial search vector quantization algorithm is used to increase the speed of the quantization by using a sorted table of the energy content of the code vector. Each subband has an associated codebook which is generated using the Pairwise Nearest Neighbor (PNN) algorithm to produce an initial codebook and then uses the generalized Lloyd (GL) algorithm to arrive at a final codebook.
Starting Page	659
Ending Page	662
File Size	368427
Page Count	4
File Format	PDF
ISBN	0780336364
DOI	10.1109/MWSCAS.1996.587822
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-08-21
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image coding Wavelet transforms Vector quantization Discrete wavelet transforms Finite impulse response filter Low pass filters Mirrors Pixel Frequency measurement Nearest neighbor searches
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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