018b00d6
 David Mayerich
adapted bsds500 f...
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#ifndef STIM_CUDA_DG1_THETA_CONV2_CUH
#define STIM_CUDA_DG1_THETA_CONV2_CUH
#include <stim/image/image.h>
#include <cmath>
#include <stim/visualization/colormap.h>
//#include <stim/image/image_contour_detection.h>
#define PI 3.1415926
#define SIGMA_N 3
//void array_multiply(float* lhs, float rhs, unsigned int N);
//void array_add(float* ptr1, float* ptr2, float* sum, unsigned int N);
//void array_abs(float* img, unsigned int N);
/// This function evaluates the theta-dependent odd symmetric gaussian derivative gradient of an one-channel image
/// @param img is the one-channel image
/// @param r is an array of radii for different scaled discs(filters)
/// @param sigma_n is the number of standard deviations used to define the sigma
/// @param theta is angle used for computing the gradient
stim::image<float> dG1_theta_conv2(stim::image<float> image, int sigma, float theta){
float theta_r = (theta * PI)/180; //change angle unit from degree to rad
unsigned int w = image.width(); // get the width of picture
unsigned int h = image.height(); // get the height of picture
int r = SIGMA_N * sigma;
unsigned N = w * h; // get the number of pixels of picture
int winsize = 2 * SIGMA_N * sigma + 1; // set the winsdow size of filter
stim::image<float> I(w, h, 1, 2); // allocate space for return image of dG1_conv2
stim::image<float> Ix(w, h); // allocate space for Ix
stim::image<float> Iy(w, h); // allocate space for Iy
stim::image<float> dG1_theta(w, h); // allocate space for Pb
I = dG1_conv2(image, sigma); // calculate the Ix, Iy
Ix = I.channel(0);
Iy = I.channel(1);
array_multiply(Ix.data(), cos(theta_r), N); //Ix = Ix*cos(theta_r)
array_multiply(Iy.data(), sin(theta_r), N); //Iy = Iy*sin(theta_r)
array_add(Ix.data(), Iy.data(), dG1_theta.data(), N); //dG1_theta = Ix + Iy;
array_abs(dG1_theta.data(), N);
//stim::cpu2image(I.channel(0).data(), "data_output/dG1_theta_x_0919.bmp", w, h, stim::cmBrewer);
//stim::cpu2image(I.channel(1).data(), "data_output/dG1_theta_y_0919.bmp", w, h, stim::cmBrewer);
//stim::cpu2image(dG1_theta.data(), "data_output/dG1_theta_0919.bmp", w, h, stim::cmBrewer);
return dG1_theta;
}
#endif
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