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Open Source Computer Vision Library
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79 lines
2.3 KiB
79 lines
2.3 KiB
#ifndef _LSVM_FFT_H_ |
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#define _LSVM_FFT_H_ |
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#include "_lsvm_types.h" |
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#include "_lsvm_error.h" |
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#include <math.h> |
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/* |
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// 1-dimensional FFT |
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// |
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// API |
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// int fft(float *x_in, float *x_out, int n, int shift); |
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// INPUT |
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// x_in - input signal |
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// n - number of elements for searching Fourier image |
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// shift - shift between input elements |
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// OUTPUT |
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// x_out - output signal (contains 2n elements in order |
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Re(x_in[0]), Im(x_in[0]), Re(x_in[1]), Im(x_in[1]) and etc.) |
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// RESULT |
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// Error status |
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*/ |
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int fft(float *x_in, float *x_out, int n, int shift); |
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/* |
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// Inverse 1-dimensional FFT |
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// |
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// API |
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// int fftInverse(float *x_in, float *x_out, int n, int shift); |
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// INPUT |
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// x_in - Fourier image of 1d input signal(contains 2n elements |
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in order Re(x_in[0]), Im(x_in[0]), |
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Re(x_in[1]), Im(x_in[1]) and etc.) |
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// n - number of elements for searching counter FFT image |
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// shift - shift between input elements |
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// OUTPUT |
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// x_in - input signal (contains n elements) |
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// RESULT |
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// Error status |
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*/ |
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int fftInverse(float *x_in, float *x_out, int n, int shift); |
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/* |
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// 2-dimensional FFT |
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// |
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// API |
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// int fft2d(float *x_in, float *x_out, int numRows, int numColls); |
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// INPUT |
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// x_in - input signal (matrix, launched by rows) |
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// numRows - number of rows |
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// numColls - number of collumns |
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// OUTPUT |
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// x_out - output signal (contains (2 * numRows * numColls) elements |
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in order Re(x_in[0][0]), Im(x_in[0][0]), |
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Re(x_in[0][1]), Im(x_in[0][1]) and etc.) |
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// RESULT |
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// Error status |
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*/ |
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int fft2d(float *x_in, float *x_out, int numRows, int numColls); |
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/* |
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// Inverse 2-dimensional FFT |
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// |
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// API |
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// int fftInverse2d(float *x_in, float *x_out, int numRows, int numColls); |
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// INPUT |
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// x_in - Fourier image of matrix (contains (2 * numRows * numColls) |
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elements in order Re(x_in[0][0]), Im(x_in[0][0]), |
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Re(x_in[0][1]), Im(x_in[0][1]) and etc.) |
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// numRows - number of rows |
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// numColls - number of collumns |
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// OUTPUT |
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// x_out - initial signal (matrix, launched by rows) |
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// RESULT |
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// Error status |
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*/ |
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int fftInverse2d(float *x_in, float *x_out, int numRows, int numColls); |
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#endif
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