NDLI: Some experiments in adaptive and predictive hadamard transform coding of pictures

Content Provider	IEEE Xplore Digital Library
Author	Netravali, A. N. Prasada, B. Mounts, F. W.
Copyright Year	1922
Description	This paper describes some experiments in adaptive and predictive Hadamard transform coding of still pictures using a small transform block (2 × 2 × 2). Predictive coding of the transform coefficients is discussed using certain combinations of coefficients of the present as well as previously transmitted blocks as predictors. Two separate adaptive quantization techniques are considered. The first technique relates to pcm quantization, in which a uniform pcm quantizer with a different number of quantization levels is used, depending upon the spatial activity within the block. The second technique alters the quantizer of a predictive transform coder based on a weighted sum of already transmitted coefficients of the present and previous blocks. Finally, we give a comparison of three coding techniques: (i) adaptive predictive transform coding, (ii) nonadaptive transform coding, and for comparison, (iii) nonadaptive predictive coding in the picture element domain using a two-dimensional prediction.
Starting Page	1531
Ending Page	1547
Page Count	17
File Size	1426258
File Format	PDF
ISSN	00058580
Volume Number	56
Issue Number	8
Language	English
Publisher	American Telephone and Telegraph Company (AT&T)
Publisher Date	1977-01-01
Access Restriction	Subscribed
Rights Holder	Bell Labs
Content Type	Text
Resource Type	Article
Subject	Engineering

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