NDLI: A multi-dimensional measure for image quality

Content Provider	IEEE Xplore Digital Library
Author	Eskicioglu, A.M.
Copyright Year	1995
Description	Author affiliation: Dept. of Comput. Sci., North Texas Univ., Denton, TX, USA (Eskicioglu, A.M.)
Abstract	Summary form only given. It is necessary to develop a quality measure that is capable of determining (1) the amount of degradation, (2) the type of degradation, and (3) the impact of compression on different frequency ranges, in a reconstructed image. We discuss the development of a new graphical measure based on three criteria. To be able to make a local error analysis, we first divide a given image (the original or a degraded) into areas with certain activity levels using, as in the case of Hosaka plots, a quadtree decomposition. The largest and smallest block sizes in our decomposition scheme are 16 and 2, respectively. This gives us 4 classes of blocks having the same size. Class i represents the collection of i/spl times/i blocks; a higher value of i denotes a lower frequency area of the image. After obtaining the quadtree decomposition for a specified value of the variance threshold, we compute three values for each class i (i=2,4,8,16), and normalize them according to: (1) the number of pixels/the number of pixels in the entire image; (2) the number of distinct pixel values/the number of possible pixel values; and (3) the average of the standard deviations in the blocks/a preset maximum standard deviation. The essential characteristics of the image are then displayed in a normalized bar chart. This lays the foundations for designing optimized image coders.
File Size	96902
File Format	PDF
ISBN	0818670126
ISSN	10680314
DOI	10.1109/DCC.1995.515579
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-03-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image quality Image coding Degradation Pixel Image reconstruction Image storage Frequency measurement Application software Bandwidth Transform coding
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications

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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