NDLI: A building block approach to color graphics

Content Provider	ACM Digital Library
Author	Flexer, J. Robert Wiederhold, Gio
Abstract	Graphics and imaging are important in scientific, academic and industrial environments. In the past graphics systems have been used with large computers and were only available to a minority of users. The relatively small and specialized use of graphics has inhibited sharing of software and prevented standardization necessary for widespread use. Dense semiconductor memory has recently become easily available in large quantities and makes high resolution graphics and imaging systems feasible. The concepts leading to the design of the present system come from the need to provide a large number of graphic and imaging functions, in a compact form, to a commonly used microprocessor bus. Three fundamental functions are implemented: a video frame digitizer, an image memory, and an output video generator. Video images can be digitized in one frame time with a precision of 1, 2 or 4 bits per pixel. The video generator can display the images in gray levels or in color. The software selectable system parameters include a variety of image formats, video output controls, digitization commands, addressing modes, vertical image offset, and lightpen controls. A novel contouring digitization mode is useful to reduce images obtained in gray scale to outline form. Such real-time preprocessing reduces memory and bandwidth requirements. Photographic illustrations demonstrate various operating modes.
Starting Page	238
Ending Page	245
Page Count	8
File Format	PDF
ISSN	00978930
DOI	10.1145/965103.807451
Journal	ACM SIGGRAPH Computer Graphics (COMG)
Volume Number	13
Issue Number	2
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1988-08-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Color graphics Rasterscan display S-100 bus Video digitizer Imaging Frame buffer Lightpen Photo trigger Video display
Content Type	Text
Resource Type	Article
Subject	Computer Science Computer Graphics and Computer-Aided Design

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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