[comp.graphics] Info Request--Image Compression by Discrete Cosine Xform

nitzberg@brauer.harvard.edu (Mark Nitzberg) (04/11/90)

Can anyone direct me to a source for a layman's
description of image compression methods based on the
discrete cosine transform, and perhaps even some code
that implements it (or a board that does it in hardware)?

Mark Nitzberg
nitzberg@zariski.harvard.edu

jim@baroque.Stanford.EDU (James Helman) (04/12/90)

A image compression method which uses discrete cosine transforms was
adopted by JPEG (Joint Photographic Expert Group) under the CCITT.
There's even a startup company, called C-Cube which implements it on a
chip.  C-Cube sells a development board for the Machintosh.  One of
the founders gave a talk out here last week.  Quite impressive.   NTSC
video resolution images compressed 20:1 in real time by a $150 chip.

Jim Helman
Department of Applied Physics			6 Trillium Lane
Stanford University				San Carlos, CA 94070
(jim@thrush.stanford.edu) 			(415) 723-9127