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[TASK] Begin implementing basic gradiant parts for canny edge.

This commit is contained in:
Jan Philipp Timme 2015-12-18 14:30:38 +01:00
parent 57b4ab7b4d
commit 9c3cceef31
1 changed files with 37 additions and 6 deletions
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43
canny_edge_machine.cpp
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@ -77,7 +77,7 @@ class CannyEdgeMachine {
filter[i*filter_width + j] = pow(2, i) * pow(2, j);
sum_weights += filter[i*filter_width + j];
}
}
}
// apply gauss filter
int filter_offset = (filter_width+1)/2;
for(int x=(0+filter_offset); x<(this->width-filter_offset); x++) {
@ -105,14 +105,45 @@ class CannyEdgeMachine {
free(filter);
};
void doGradiants(void) {
// build the gradiant vector
int gradiant_size = 3;
double* gradiant_vector = (double*) malloc(sizeof(double) * gradiant_size);
gradiant_vector[0] = -0.5;
gradiant_vector[1] = 0;
gradiant_vector[2] = 0.5;
int gradiant_offset = gradiant_size;
// calculate gradiants
for(int x=(0+gradiant_offset); x<(this->width-gradiant_offset); x++) {
for(int y=(0+gradiant_offset); y<(this->height-gradiant_offset); y++) {
int h, s, l;
// x gradiant
double sum_intensity = 0;
for(int i=0; i<gradiant_size; i++) {
int dx = i - gradiant_size/2;
QColor color = QColor::fromRgb(this->original->getPixel(x+dx, y, LazyImage::DEFAULT));
color.getHsl(&h, &s, &l);
sum_intensity += l * gradiant_vector[i];
}
this->gradient_x[y*width + x] = sum_intensity;
// y gradiant
double sum_intensity = 0;
for(int i=0; i<gradiant_size; i++) {
int dy = i - gradiant_size/2;
QColor color = QColor::fromRgb(this->original->getPixel(x, y+dy, LazyImage::DEFAULT));
color.getHsl(&h, &s, &l);
sum_intensity += l * gradiant_vector[i];
}
this->gradient_y[y*width + x] = sum_intensity;
}
}
free(gradiant_vector);
};
void work() {
this->reset();
this->doGaussBlur();
/*for(int x=0; x<this->width; x++) {
for(int y=0; y<this->height; y++) {
//this->gradient_magnitude = sqrt(...)
}
}*/
this->doGradiants();
};