by W.A. Steer PhD
Welcome to techmind.org, a site devoted to sharing my enthusiasm and
knowledge of various aspects of science and technology. You'll find approachable but
in-depth information on many topics including single-image autostereograms (those clever
3D pictures), electronics and PC interfacing projects, audio and graphics programming, sonoluminescence, as well as ready-to-run downloadable programs to experiment with.
I hope you find the site useful.
- Stereogram discussion, algorithms & software
Ever wondered how those 3D pictures work, or how to make your own? This section
explains all, from a very general overview of the principle and software to download,
right down to a line-by-line description of the algorithms I used.
Sonoluminescence is a little-understood phenomenon whereby light is emitted by tiny bubbles suspended in a liquid subjected to intense acoustic fields. This illustrated article explains in detail how I set up apparatus to demonstrate the effect.
- Digital Photo Printing - a technical assessment
Consumer in-store and online digital photo printing services have recently become widely available.
I generated a series of photographs and test-images to evaluate these services from a technical perspective,
and my findings are presented here.
- Digital Photo Printing Guide
A 'prequel' to the technical assessment. Building on my experience, this page sets out the basics of getting
the best out of consumer photo-printing services, including introductory-level colour-matching.
- Digital Signal Processing
A practical introduction to DSP techniques for frequency-domain processing. [New/still evolving]
Software to experiment with
Homebrew video projects
Short technical notes
Understanding and Visualising Energy Issues
We hear more and more about the Environment, global warming, CO2 in the media, yet too many stories
and column-inches are well-meaning but emotionally charged and poorly-informed. This new section of my
website aims to try and give a more balenced and scientifically-rooted perspective on energy-issues.
- Energy Calculations - calculations and key figures to facilitate
some rationality in energy debates
A new feature - the tech proj blog!
If you enjoyed this site, you might find some of my "bookmarks" useful.
A complete mirror of my old site ( http://www.ucl.ac.uk/~ucapwas/ ) can be found at
Please don't forge any new links to these pages though; this mirror is only supposed to be temporary. Thanks.
Created: October 2001
Last modified: 15 Jan 2012
©2005-12 William Andrew Steer