Category Archives: wavelet

Wavelet Image Compression

More Speed, less Fat

Posted on 2003-05-17 [Saturday] by [maven]

Updated the wavelet-code to version 2.6. What’s new? Speed… I essentially added a new data-independent error-estimator (“Approximate” in the GUI) and optimised the wavelet-transforms (MMX-code) and lots of other bits and pieces… Complete Package. Demo-Page.

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No reaction

Posted on 2003-04-10 [Thursday] by [maven]

I’ve been thinking about relicensing the wavelet-code under the zlib-license… Anyone interested enough in that to be worth doing?

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Wavelet Fixes

Posted on 2003-02-14 [Friday] by [maven]

*Small bug fixed (decidedly non-power-of-2 images sometimes had important wavelet-coefficients zeroed out). Thanks, Christian Lange!* Wavelet code updated to version 2.5.2 (including source). Improved the quantiser-selection for bit-limits (i.e. file-size) a LOT (was a bit stupid before – I only … Continue reading →

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Improved the wavelet-code a bit

Posted on 2003-01-01 [Wednesday] by [maven]

Added support for loading texture- and cube-maps and changed the GUI so that it can be used to view files from the command-line.

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Better, smaller, faster

Posted on 2002-08-14 [Wednesday] by [maven]

Fixed the bug and updated the wavelet code to 2.5. Includes much faster compression, smaller memory footprint and a web-browser plugin w/ progressive downloading. Check the code-page for source and details. Also take a look at the demonstration-page to test … Continue reading →

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Warning

Posted on 2002-08-13 [Tuesday] by [maven]

there’s a bug in my wavelet-decompression browser plugin (using multiple threads). i’ll release version 2.5 as soon as i fix that (with the source )…

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Wavelet code now up to version 2.5

Posted on 2002-08-12 [Monday] by [maven]

Will be up on the page soon (i.e. tonight or probably tomorrow). Sneak preview available here. The browser-plugin still has some multi-threading issues I need to fix (although IMO it should work… I ain’t allocating critical sections for nuthing! ).

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Integer Math in CAS

Posted on 2002-08-06 [Tuesday] by [maven]

got this week off (all of 4head does in fact), so i started to do some more research on my wavelet-code. spent two days in mathematica trying to analyse error-propagation in the wavelet-transform, proved it is symmetric (just did that … Continue reading →

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wavelet kompressor 2.1

Posted on 2002-03-01 [Friday] by [maven]

wavelet.zip updated to version 2.1. it had serious bugs in the quality based quantiser-selection (one was related to not returning lossless “solutions” when they were asked for, the other very often returned large solutions, although better (i.e. smaller) ones were … Continue reading →

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Posted on 2002-02-27 [Wednesday] by [maven]

slightly updated the wavelet code again… i had a little inspiration yesterday evening (well… it should’ve been the obvious thing to do): i now reorder the coefficients that were set to 0 (for non power-of-2 dimensions) to the end of … Continue reading →

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Posted on 2002-02-24 [Sunday] by [maven]

updated the code page w/ the wavelet kompressor, made some (very minor) changes to the code and added documentation (i think that’s a first for me !

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Posted on 2002-02-23 [Saturday] by [maven]

finished the GUI, commented the wavelet compression code (together with everything else) and released it all with source under the GPL. have fun… wavelet.zip!! and please give feedback

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