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Newsgroups: comp.sys.next.announce Path: sanguish From: bamberg@trane.eecs.wsu.edu Subject: SUBMISSION: New Instructional Software for Image and Signal Processing Message-ID: <1993Jul22.032834.2092@digifix.com> Sender: sanguish@digifix.com (Scott Anguish) Organization: Next Announcements Date: Thu, 22 Jul 1993 03:28:34 GMT Approved: sanguish@digifix.com Here is my announcement: Contact Person: Dr. Roberto H. Bamberger Organization: Signal Processing Instructional Facility School of EECS Washington State University Pullman, WA 99164-2752 email: bamberg@eecs.wsu.edu phone: (509)-335-4053 FAX: (509)-335-3818 New Software Available: We at the Signal Processing Instructional Facility (SPIF Lab) have developed some interactive software for teaching some concepts related to signal and image processing. These are all available via anonymous ftp from yardbird.eecs.wsu.edu (IP# 134.121.64.180). If you find the software helpful, please drop me a note at the above email address so I can keep my funding agents happy. If you would like to expand on what we have done, source code can be made available. All of these were developed on black hardware using NS3.0. I would love to put them out a MAB's, but NeXT does not seem interested in me doing that since their pricing is a bit high for my tastes. The new instructional apps are ImageQuantizer.app (pub/NeXT/IQ.tar.gz) A simple laboratory for experimenting with image quantization using simple uniform threshold quantizers and different types of linear prediction. It allows the user to quantize an image using PCM, DPCM, Delta Modulation, etc. and view either the compressed image, the prediction residual, the distortion incurred by the compression,... Have fun. App includes NeXTSTEP Help which discusses part of the theory of different predictive coding systems. PZPlotter.app (pub/NeXT/PZ.tar.Z) A simple interactive digital filter design program that allows a user to design digital filters by placing and moving poles and zeros on the Z plane. It simultaneously displays the Fourier magnitude and phase (or real/imag) and the impulse response. The unique attirbute of this particular package is that it allows the student to change the filter attributes (minimum phase, maximum phase, linear phase, allpass, ...) and see how this affects the pole zero locations, the impulse resonse, and/or frequency response. The app generates code for Ein.app which can then implement and apply the digital filter. Ein.app is available from ftp.princeton.edu. Weber.app (pub/NeXT/Weber.tar.Z) A simple interactive app for demonstrating how the Weber ratio can be measured. Less than thrilling on a mono station, OK on a color station, actually useful on a ND. SineWaves.app (pub/NeXT/SineWaves.tar.gz) A simple app for displaying 2D sine waves as a density plot with various amplitudes, orientation, and spatial frequency. Could have probably used Plot3D or Gnuplot instead, but this is pretty fast. I use it when I discuss the properties of the Human Visual System in my senior level image processing class. CrossSection.app (Not Yet Available) A new app we are finishing up that takes cross sections of Tiff images and displays them. It allows you to display various different color spaces. I intend to use this when discussing various different color spaces and as an image inspector. We are also developing other image inspectors which include block transforms (FFT, DCT, etc) , filter banks (such as wavelets), and other useful representations. This will be out by the end of August. There are a few other odds and ends. Feel free to poke around. All this stuff is free, just let me know if you use it and/or have comments/suggestions.
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Marcel Waldvogel and Netfuture.ch.