peter@cs.uwa.oz.au (Peter Dodd) (03/25/91)
Hello, Im looking for any public domain compression algorithms that may be floating around in ftp-able source code. Im looking at implementing an image compression and retrieval system that will handle MacPaint, TIFF, and PICT types of files. Any pointers (or handles) would be appreciated! Peter Dodd Computer Science Department University of Western Australia
aep@world.std.com (Andrew E Page) (04/04/91)
I am trying to get my company interested in compression. To date I have not seen any PD image compressing routines so far. I hate to tell you this but most companies that develop such code are quite likely to guard it as proprietary. I think your best bet is to get yourself a copy of the draft JPEG standard and try yourself. I know that Texas Instruments "Theory, Algorithms, and Implementations Vol III." Has an example of DCT with the C30 and C25. That would be a good starting point. Also check out the comp.compression group. -- Andrew E. Page (Warrior Poet) | Decision and Effort The Archer and Arrow Concepts Engineering | The difference between what we are CIS:70202,234 BIX:page1 | and what we want to be.
zben@ni.umd.edu (Ben Cranston) (04/05/91)
On page 49 of the April MacUser there is a nice little blurb on JPEG and some product announcements. Radius has a software product called ImpressIt. Storm Technology has PicturePress and the PicturePress Accelerator. I called Storm up and they were very helpful, including faxxing me a letter from the chair of X3L2.8 about the standardization effort. Evidently JPEG is being standardized by an ISO/IEC working group in picture coding and a CCITT special rapporteur group on image communication. This contact lead to a phone conversation with Lynn Barra of X3 Secretariat/CBEMA. The working group X3L2.8 has been promoted to a full committee X3L3. The chair is C. F. Touchton at IBM. The JPEG Draft Technical Spec is now at revision 8 version 8 and is available for $8.00 payable by check, money order, or credit card (I just ordered it by visa). The contact person is Lynn Barra at (202) 626-5738 voice or (202) 638-4922 fax. Or mail to the following specifying "Attention: JPEG Draft Technical Spec": X3 Secretariat: Computer and Business Equipment Manufacturer's Association 311 First Street NW, Suite 500, Washington, DC 20001-2178 Lynn says she hopes to have MPEG (moving picture standard) within a few weeks and MPIG (???) by this summer. I have no business relationship with any of this stuff. It's just that after some years of running an Internet to Bitnet mail relay I have a great deal of respect for the standards process and what they are trying to do...