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Fast 2D Walsh-Hadamard Transform

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09 Feb 2005 (Updated )

The function implement the 2D dyadic(Paley) ordered fast in-place Walsh-Hadamard transform.

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Description

The function implement the 2D dyadic(Paley) ordered fast in-place Walsh-Hadamard transform, which can be used in signal processing, pattern recognition and Genetic alogorithms. This algorithm uses a Cooley-Tukey type signal flow graph and is implemented in N log2 N
additions and subtractions. Data sequence length must be an integer power of 2. The inverse transform is the same as the forward transform except for the multiplication factor N x N.

Acknowledgements

Walsh Transform(1 D) inspired this file.

This file inspired Faster 2 D Hadmard Tranform.

MATLAB release MATLAB 6.5 (R13)
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Comments and Ratings (2)
05 Apr 2011 victorp

Hi Gylson,

I'm trying to use your implementation to convert a gray-scale image (e.g., Lena). Unfortunately, i receive as output a matrix with ALL elements zero!
Could you clarify this?
Regards,
Victor

08 Oct 2005 gg gg  

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