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Title: Programming/Graphics/Algorithms and Data Structures - Andrew's Autostereogram Pages A detailed development of a stereogram-generation algorithm is presented, complete with a ready-to-run Windows program to download and experiment with.
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Andrew's Stereogram Pages www.techmind.org logoby W.A. Steer PhDBack to contentsAbout... Welcome to my Stereogram PagesI document the development of a top qualityalgorithm for generating stereograms, and conclude by offering aready-to-run Windows software package for you to download. You'llalso find a few examples of my stereograms as well as hints and tipsfor creating your own. thumbnail image: depthmap (4kB) thumbnail image: stereogram (13kB)Download full 170kB demo stereogram of a steam locomotive.Introduction to stereograms (non-technical)Technical description of my algorithmsSoftware to download: SISGen - my original Windows stereogram programStereograms: creating the best - hints & tips, and some answers to FAQs.Errata for "Stereogram Programming Techniques", chapter 13Sirds 1.0 for Mac OS X released! (July 2006) - Katsura has released a brand new shareware stereogram program using algorithms licensed from techmind.org, seehttp://www.katsurashareware.com/.Finally, Gareth & Peter'sstereogram page has a comprehensive list of links to other stereogram resources on the Web....and don't forget to visit the techmind.org homepage - moreinformation on what I get up to in the fields of computer programming andelectronics design.I originally got interested in stereograms in early 1994,at which time much discussion took place in Usenet newsgroup alt.3d.Back then I wrote some fairly basic programs to draw single image random dotstereograms (SIRDS), but was disappointed to find that the poor resolutionof a typical computer monitor put a severe limitation on the depthresolution that could be obtained - typically 10 discrete levels per inch.I then found I could smooth off the steps between the levels, a significantaesthetic improvement, by implementing a form of anti-aliassing, but aside-effect was a very mild ghost-like quality to some areas of the 3Dscene. I tried to convince myself then that given a high-resolution medium,really smooth and solid stereograms could quite easily be made.In early 1995, with renewed interest and convenient access to a laserprinter, I turned my thoughts to stereograms once again. It was then that Idiscovered the major problem with RDS: a pattern of random dots 600 to theinch looks like a pretty even grey mass. To overcome this I had a quick goat printing larger dots but positioning them to 600dpi. The picture was thenvisible, but the size of the dots were limiting the resolution in the x- andy-directions, and the high contrast was very harsh.This was the end of the line for SIRDS. Random dots just weren't going to do thetrick. I needed to replace the random dots with a pattern which has bothlarge-scale structure to aid easy convergence and small scale detail toconvey even subtle 3D depth information.About April time, soon after I began working on stereograms with patterns,Chris Watkins contacted me about doing a contribution on that very topic forhis new book, "Stereogram Programming Techniques". As a consequence mystereogram progression went turbo-charged (despite my having exams in May);I succeeded in writing a good working algorithm and completed a satisfactorywrite-up by the deadline for the book at the end of May.Picture of front cover of book "Stereogram Programming Techniques"by Christopher D. Watkins and Vincent P. Mallette(Charles River Media, Inc.), 1996ISBN: 1-886801-00-2See the Charles River Media pagefor more information about the book.You'll be glad to know my exams went well despite the obvious distraction(with hindsight that was probably one of the most stressful periods of mylife!), and I was able to spend a few weeks afterwards tidying up thestereogram programs at a more leisurely pace. Over the summer I worked(among other things) on developing a proper user-interface for my programs,hence SISGen was born.Key features of my software are: Hidden-surface removal at a respectable (ok, blisteringly fast!) speed.Complete absence of artifacts - no more false 'echoes' in the image.Really smooth 3D images even on ordinary low-resolution monitors.A from-the-centre-outwards approach of applying the patternto give a more balanced overall appearance.In the summer I was asked by the Alembic group at the University Twente,Holland, if I could make them a stereogram of the 60-carbon atomBuckminsterfullerine (buckyball) molecule for a poster advertising theirconference in the autumn. It turned out to be a good test of any stereogramalgorithm - and revealed a couple of minor flaws in my program, whichwere then fixed.Since then I have periodically returned to SISGen with minor improvements,mainly speedups. The result is that 640x480-pixel stereograms in 256 colours(with 2x oversampling for smoothness) can now be drawn in under 20 secondsin Windows even on an ageing 20MHz 486sx computer. Larger pictures, e.g. A4size at 135dpi (1400x1000 pixels) take around a minute. On a Pentium 90, thestereograms can be created in just a couple of seconds.More recently I have completed a set of stereograms for a small company inOregon (USA) which makes collectable kaleidoscopes. They have since shown aninterest in poster-sized stereograms, and I now have the capability tocreate stereograms up to 5000 pixels wide (10 to 20Mb files!). With a fewmore hours adapting the code, the remaining limitations could be removed,leaving only the free space on my hard disk as the final constraint!Owing to the file sizes involved, it would be unreasonable (and impractical)to exhibit the full detail of my large, high-resolution stereograms here.The January 1997 edition of MicrosoftInteractive Developer Magazine featured an article onstereogram programming using Java, which was heavily based onmy C programs.HomepageHistory traceable back to: 1994Last modified: 15 July 2006Source: http://www.techmind.org/stereo/©1994-2006 William Andrew Steerandrew@techmind.org
 

A

detailed

development

of

a

stereogram-generation

algorithm

is

presented,

complete

with

a

ready-to-run

Windows

program

to

download

and

experiment

with.

http://www.techmind.org/stereo/stereo.html

Andrew's Autostereogram Pages 2008 September

dvd rental

dvd


A detailed development of a stereogram-generation algorithm is presented, complete with a ready-to-run Windows program to download and experiment with.

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