gaussian_conv_dct.h

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#ifndef _GAUSSIAN_CONV_DCT_H_
#define _GAUSSIAN_CONV_DCT_H_

#include <fftw3.h>
#include "num.h"

typedef struct dct_coeffs_
{
    FFT(plan) forward_plan;     
    FFT(plan) inverse_plan;     
    num *dest;                  
    const num *src;             
    enum
    {
        DCT_GAUSSIAN_1D,
        DCT_GAUSSIAN_IMAGE
    } conv_type;                
    union
    {
        struct
        {
            num alpha;          
            long N;             
            long stride;        
        } one;                  
        struct
        {
            num alpha_x;        
            num alpha_y;        
            int width;          
            int height;         
            int num_channels;   
        } image;                
    } dims;
} dct_coeffs;

int dct_precomp(dct_coeffs *c, num *dest, const num *src,
    long N, long stride, double sigma);
int dct_precomp_image(dct_coeffs *c, num *dest, const num *src,
    int width, int height, int num_channels, double sigma);
void dct_free(dct_coeffs *c);
void dct_gaussian_conv(dct_coeffs c);

#endif /* _GAUSSIAN_CONV_DCT_H_ */