Discrete Cosine Transform in C#?

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illusion.admins@gmail.com - 05 Mar 2008 14:50 GMT

Has anyone had experience with or implemented a Discrete Cosine
Transform in C#? Found code for FFT which I have taken advantage of
and modified for my use but can not find a thing for DCT. Any help
would be great!

Thanks

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not_a_commie - 05 Mar 2008 15:25 GMT

Are you looking for a general DCT or an 8x8 DCT for JPEG de/
compression? Are you needing it to use SIMD instructions or not?

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illusion.admins@gmail.com - 05 Mar 2008 15:51 GMT

> Are you looking for a general DCT or an 8x8 DCT for JPEG de/
> compression? Are you needing it to use SIMD instructions or not?

I just need a general DCT. Simply I have an image that I need to
perform a DCT on so I can see the results of the DCT.

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Ben Voigt [C++ MVP] - 05 Mar 2008 18:45 GMT

> Has anyone had experience with or implemented a Discrete Cosine
> Transform in C#? Found code for FFT which I have taken advantage of
> and modified for my use but can not find a thing for DCT. Any help
> would be great!
>
> Thanks

C# math is compatible with ANSI C. Find a implementation of DCT you like
and change cos to Math.Cos...

How many times are you doing this? If you are just wanting to see the
transform of a handful of images, you'd be better off using a purpose-built
signal processing package like matlab (or its free clone, octave). Only if
you need to automate the process to be done a million times would C# make
sense, and a matlab script would probably still be faster. Another
advantange to using such a tool is that someone else has already taken care
of numerical stability.

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Discrete Cosine Transform in C#?

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