gaussian_conv_deriche.h

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#ifndef _GAUSSIAN_CONV_DERICHE_H_
#define _GAUSSIAN_CONV_DERICHE_H_

#include "num.h"

#define DERICHE_MIN_K       2

#define DERICHE_MAX_K       4

#define DERICHE_VALID_K(K)  (DERICHE_MIN_K <= (K) && (K) <= DERICHE_MAX_K)

typedef struct deriche_coeffs
{
    num a[DERICHE_MAX_K + 1];             
    num b_causal[DERICHE_MAX_K];          
    num b_anticausal[DERICHE_MAX_K + 1];  
    num sum_causal;                       
    num sum_anticausal;                   
    num sigma;                            
    int K;                                
    num tol;                              
    long max_iter;
} deriche_coeffs;

void deriche_precomp(deriche_coeffs *c, double sigma, int K, num tol);
void deriche_gaussian_conv(deriche_coeffs c,
    num *dest, num *buffer, const num *src, long N, long stride);
void deriche_gaussian_conv_image(deriche_coeffs c,
    num *dest, num *buffer, const num *src,
    int width, int height, int num_channels);

#endif /* _GAUSSIAN_CONV_DERICHE_H_ */