kmcvay@oneb.UUCP (Ken McVay) (02/07/91)
I am looking for video image compression techniques/algorithims, or information regarding research being undertaken in that general area. I need a fully-reversable compression system providing a compression ratio >5 and high speed for a project I am involved with, and would appreciate any information on existing systems, work in progress, source, etc. Both p/d and commercial systems are of interest, as long as the ratio is high and the compression/decompression is fast enough to do the job in seconds rather than minutes.
torbjorn@forit.forut.no (Torbjorn Sund) (02/08/91)
Algorithm: Since you want compression > 5 your only chance is to use an irreversible algorithm. The most widely used are variations upon cosine transform, truncating the coefficients and / or skipping high-frequency terms. It even has a standard coming from JPEG. With video pictures the reversible algorithms will only give you compression of 2 (more on cartoon-like pictures). Speed: If you want the job done in seconds on a pc-platform you will have to do it in hardware. There is a chip out there which implements the JPEG standard, there are also boards with the chip on it. Try looking through a number of previous Byte`s, new products section, or maybe someone else can supply a pointer.