Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ADS.COM!Vision-List-Request From: Vision-List-Request@ADS.COM (Vision-List moderator Phil Kahn) Newsgroups: comp.ai.vision Subject: Vision-List delayed redistribution Message-ID: <8908010500.AA24449@deimos.ads.com> Date: 31 Jul 89 18:25:00 GMT Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: Vision-List@ADS.COM Distribution: inet Organization: The Internet Lines: 213 Approved: vision-list@ads.com Vision-List Digest Mon Jul 31 10:25:00 PDT 89 - Send submissions to Vision-List@ADS.COM - Send requests for list membership to Vision-List-Request@ADS.COM Today's Topics: Resolution issues Satellite Image Data IJCAI 89 Update color processing defocussing & Fourier domain. Need time sequences sampled in various ways ---------------------------------------------------------------------- Date: 21 Jul 89 22:13:53 GMT From: muttiah@cs.purdue.edu (Ranjan Samuel Muttiah) Subject: Resolution Organization: Department of Computer Science, Purdue University I am looking for reference material on that may have been written on issues pertaining to the relationship of machine vision resolution, accuracy, and execution time. Please email. Thanks ------------------------------ Date: Wed, 26 Jul 89 14:30:09-0000 From: Farzin Deravi Subject: Satellite Image Data I need some satellite image data in a form portable to an IBM PC environment for a student who is doing a project on region classification by texture. Could you suggest where I can easily obtain such data. By "easily" I mean not having to write letters/applications and preferably through email! Many thanks for your help and advice. - - - - - - - - - - - - - - - - - - - - Farzin Deravi, | UUCP : ...!ukc!pyr.swan.ac.uk!eederavi| Image Processing Laboratory, | JANET : eederavi@uk.ac.swan.pyr | Electrical Engineering Dept., | voice : +44 792 295583 | University of Wales, | Fax : +44 792 295532 | Swansea, SA2 8PP, U.K. | Telex : 48149 | - - - - - - - - - - - - - - - - - - - - ------------------------------ Date: Wed, 26 Jul 89 15:39:06 EDT From: dewitt@caen.engin.umich.edu (Kathryn Dewitt) Subject: IJCAI 89 Update CONFERENCE HIGHLIGHTS Invited Speakers: Koichi Furukawa, ICOT will speak Monday, August 21, at 11:10am. The title of his talk is "Fifth Generation Computer Project: Toward a Coherent Framework for Knowledge Information Processing and Parallel Processing". Gerald Edelman, Rockefeller University, will speak Monday August 21, at 2:00pm. The title of his talk is"Neural Darwinism and Selective Recognition Automata". E.D. Dickmanns, Universitat de Bundeswehr Munchen, will speak Wednesday, August 23, at 11:10am. The title of his talk is "Real-Time Machine Vision Exploiting Integrak Spatio-Temporal World Models". Enn Tyugu, Institute of Cybernetics, USSR, will speak Thursday, August 24, at 9:00am. The title of his talk is "Knowledge-Based Programming Environments" Fernado Pereira, AT&T Bell Laboratories, will speak Thursday, August 24, at 11:10am. The title of his talk is "Interpreting Natural Language". Geoffrey Hinton, University of Toronto, will speak Friday, August 25, at 11:10 am. The title of his talk is "Connectionist Learning Procedures". Invited Panels: THE CHALLENGE OF NEURAL DARWINISM - Monday, August 21, 4:15pm. members: Stephen W. Smoliar(chair), Linda Smith, David Zisper, John Hollandand George Reeke ROBOT NAVIGATION - Tuesday, August 22, 9:00am members: David Miller(chair), Rod Brooks, Raja Chatila, Scott Harmon, Stan Rosenschein, Chuck Thorpe, and Chuck Weisbin. HIGH-IMPACT FUTURE RESEARCH DIRECTIONS FOR ARTIFICIAL INTELLIGENCE Tuesday, August 22, 11:10am. members: Perry Thorndyke(Chair), Raj Reddy, and Toshio Yakoi ARTIFICIAL INTELLIGENCE and SPACE EXPLORATION - Tuesday, August 22, 2:00pm members: Peter Friedland(chair), David Atkinson, John Muratore, and Greg Swietek. (HOW) IS AI IMPACTING MANUFACTURING? - Friday, August 25, 9:00am. members: Mark Fox (chair), E.J. van de Kraatz, Dennis O'Connor, and Karl Kempf. ------------------------------ Date: Wed, 26 Jul 89 13:35:04 MET DST From: mcvax!irst.it!bellutta@uunet.UU.NET (Paolo Bellutta) Subject: color processing I have a couple of problem about color procesing. First: What is the best way to compress 24 bit color images in 8 bit color images but using always the same colormap? I tryed to assign 3 bits for red and green and 2 bits for blue but the results are not very good (the image in general has a very high contrast). Second: I want to compute from 24 bit rgb images one image that contains luminance information (Y = 0.299 * R + 0.587 * G + 0.114 * B) and another image with chrominance information (C = R / (R + G)). In parentheses I wrote what I'm using. I found that in general the Y image has high contrast and the C image has poor color resolution. I mean that if two sides of an object have the same color but one is too dark, on the C image it is seen as black. Are there better algorithms to use? ___ ___ / ) / ) /--- /---\ / __ _ / _ / ) _ / / /_ /_ __ / (_/__(_)__/__(_) /_____/ (-'__/__/__/_/__/___/___(_/_ I.R.S.T. loc. Pante' di Povo 38050 POVO (TN) ITALY vox: +39 461 810105 fax: +39 461 810851 e-mail: bellutta@irst.uucp bellutta@irst.it ------------------------------ Date: Fri, 28 Jul 89 10:27:58 +0100 From: prlb2!ronse@uunet.UU.NET (Christian Ronse) Subject: defocussing & Fourier domain. Suppose that one makes a picture of an image with out-of-focus lenses. The transformation from the original image to the blurred picture is linear and translation-invariant (I think!). What is known about the Fourier transform of this blurring transformation, in particular on its phase spectrum? Christian Ronse Internet: maldoror@prlb.philips.be UUCP: maldoror@prlb2.uucp ARPA: maldoror%prlb.philips.be@uunet.uu.net maldoror%prlb2.uucp@uunet.uu.net BITNET: maldoror%prlb.philips.be@cernvax maldoror%prlb2.uucp@cernvax [ This is an interesting question. Krotkov, Pentland, and Subbarao have looked at some of these issues as they relate to computer vision (Krotkov recently published a paper in IJCV, and Pentland in PAMI). I assume that you mean translation-invariant in the plane (since translation in depth is what causes the blurring). Though lens effects undermine this (e.g., diffraction, lens defects), the plane translation invariance seems reasonable to me. The blur function due to defocussing is in the optics literature. It has been approximated by some as a gaussian (which, not coincidentally, is well-suited for analytic analysis in the Fourier domain). The spread function differs with the wavelength of light, and this introduces some complexities. Subbarao has addressed this issue, though I don't know of a specific reference (he is at SUNY Buffalo). phil... ] ------------------------------ Date: Mon, 31 Jul 89 09:46:35 PDT From: althea!pxjim@uunet.uu.net (James Conallen) Subject: Need time sequences sampled in various ways Hi there, I just recently posted a request for image sequences on comp.graphics, and a reply from Prof. Dave Chelberg [dmc@piccolo.ecn.purdue.edu) suggested I post on the vision list. I am looking for image sequences time sequentialy sampled with different sampling patterns. The ones I am interested in are: lexicographic 2:1 line interlaced 2:1 dot interlaced bit reversed line interlaced bit reversed dot interlaced I prefer 256x256x256 BW images, but I'm humble. Can you offer me any help? -jim conallen BITNET: pxjim@widener UUCP: pxjim@althea AT&T: (215)499-1050 ------------------------------ End of VISION-LIST ********************