Wavelet image, video compression technology address file size problem
- By Karole L. Johns
- Sep 21, 1998
Wavelet algorithms compress video files and boost
their transmission speed.
Although video phones are a long way from widespread acceptance, full-motion video over
standard telephone lines has started to close the gap.
Universal Serial Bus and FireWire ports in PCs solve the connectivity problem, but what
about file sizes? Static image files are the largest in common use on PCs, and video files
far outscale them. Without some kind of automatic compression utility, video files become
Summus Technologies Inc. of Fort Lauderdale, Fla., may have an answer in its wavelet
image and video compression technology.
Company president and mathematician Bjorn Jawerth put his 25 years of wavelet research
into designing the In2Act package, which is almost ready to hit the market.
Wavelet algorithms compress video files and boost their transmission speed. A wavelet
file is about one-third the size of a Joint Photographic Experts Group-compressed file.
The company describes such files as perceptually lossless and capable of magnification
without pixelation or image distortion.
In2Act on a 200-MHz processor sends a 320- by 240-pixel video stream at 15 frames per
second over a standard phone line at 28.8 Kbps. Over an Integrated Services Digital
Network or T1 line, it can send real-time video at 30 frames per second.
The fast throughput comes from priority-based progressive transmission. Basic image
content is transmitted first, figures next and backgrounds last. The software packs
built-in image magnification, sharpening, smoothing and focusing.
More information appears on the Web at http://www.summus.com.
The packages Advanced Object Identification Core can detect and track predefined
objects in real time. In2Act runs on PCs and Apple Macintoshes on heterogeneous networks.
Summus Technologies is a contractor to the Defense Department, Defense Advanced
Research Projects Agency and Office of Naval Research.
Contact Summus at 888-553-1555.