From mboxrd@z Thu Jan 1 00:00:00 1970 To: 9fans@cse.psu.edu From: Jeff Sickel Message-ID: <1029570h3tegkfa@corp.supernews.com> References: <1025vjfc29qns5b@corp.supernews.com>, <89850e23e6bc5a40e7960d1a8b06999e@vitanuova.com> Subject: Re: [9fans] nice hardware for a cpu server Date: Mon, 9 Feb 2004 10:20:07 +0000 Topicbox-Message-UUID: d43ebf26-eacc-11e9-9e20-41e7f4b1d025 rog@vitanuova.com wrote: > > DjVu on the other hand was a very nice wavelet based image system... > what are wavelets? In this case the wavelets are used for bitmap image compression algorithms. Unfortunately, ASCII doesn't exactly produce the equation correctly: http://documents.wolfram.com/applications/wavelet/index2.html But in the exact reference I was mentioning, http://djvu.sourceforge.net/ would be your best bet. You could also look at http://www.wavelet.org/ though that wouldn't exactly give you the most discrete definition. Wavelet algorithms have also shown up in JPEG2000, but I'm not familiar enough with that spec to really comment. Unfortunately, the djvu base library is implemented in C++ which would put the Plan 9 C compiler out of the running. But nudging the port into a C version would be a nice thing as I've had problems with various gcc versions in the past. jas ___ remove spamisham.