Hochschulprojekte/CG2_Tasks
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[TASK] Implement real gauss filter, fix the whole thing up.

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This commit is contained in:
Jan Philipp Timme 2016-01-05 17:08:48 +01:00
parent 6f70f12946
commit 94e32cd4b9
3 changed files with 35 additions and 18 deletions
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41
canny_edge_machine.cpp
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@ -27,6 +27,7 @@ class CannyEdgeMachine {
// Params
int filter_size;
double filter_sigma;
double t_low;
double t_high;
@ -54,8 +55,9 @@ class CannyEdgeMachine {
free(this->gradient_y);
};
void setGaussFilterSize(int filter_size) {
void setGaussFilterParams(int filter_size, double filter_sigma) {
this->filter_size = filter_size;
this->filter_sigma = filter_sigma;
};
void setThresholdValues(double t_low, double t_high) {
@ -73,26 +75,33 @@ class CannyEdgeMachine {
}
};
void doGaussBlur(int filter_width) {
double gauss(int x, int y, double sigma) {
// e^-((x^2 + y^2)/(sigma^2))
double upper_part = pow(M_E, (-1.0) * ( (pow(x, 2)+pow(y, 2))/pow(sigma, 2) ) );
return upper_part;
};
void doGaussBlur(void) {
int filter_width = this->filter_size;
double sigma = this->filter_sigma;
// build the gauss filter
int* filter = (int*) malloc(sizeof(int) * filter_width * filter_width);
int sum_weights = 0;
int filter_middle = (filter_width)/2;
double* filter = (double*) malloc(sizeof(double) * filter_width * filter_width);
double sum_weights = 0;
std::cout << "Using gauss filter: " << std::endl;
for(int x=0; x<filter_width; x++) {
int i = x;
if(x > filter_middle) i = filter_middle - (x - filter_middle);
for(int y=0; y<filter_width; y++) {
int j = y;
if(y > filter_middle) j = filter_middle - (y - filter_middle);
filter[i*filter_width + j] = pow(2, i) * pow(2, j);
sum_weights += filter[i*filter_width + j];
filter[x*filter_width + y] = this->gauss(x, y, sigma);
sum_weights += filter[x*filter_width + y];
std::cout << "(" << x << ", " << y << ") " << filter[x*filter_width + y] << " | ";
}
std::cout << std::endl;
}
std::cout << std::endl << "Sum weights: " << sum_weights << std::endl;
// apply gauss filter
int filter_offset = (filter_width+1)/2;
for(int x=(0+filter_offset); x<(this->width-filter_offset); x++) {
for(int y=(0+filter_offset); y<(this->height-filter_offset); y++) {
int sum_intensity = 0;
double sum_intensity = 0.0;
int h, s, l;
for(int fx=0; fx<filter_width; fx++) {
int dx = fx - (filter_width / 2);
@ -105,7 +114,7 @@ class CannyEdgeMachine {
}
QColor color = QColor::fromRgb(this->original->getPixel(x, y, LazyImage::DEFAULT));
color.getHsl(&h, &s, &l);
l = qRound((1.0*sum_intensity) / (1.0*sum_weights));
l = qRound(sum_intensity/sum_weights);
if(l > 255) l = 255;
if(l < 0) l = 0;
color.setHsl(h, s, l);
@ -132,7 +141,7 @@ class CannyEdgeMachine {
sum_intensity = 0;
for(int i=0; i<gradiant_size; i++) {
int dx = i - gradiant_offset;
QColor color = QColor::fromRgb(this->original->getPixel(x+dx, y, LazyImage::DEFAULT));
QColor color = QColor::fromRgb(this->working_copy->getPixel(x+dx, y, LazyImage::DEFAULT));
color.getHsl(&h, &s, &l);
sum_intensity += l * gradiant_vector[i];
}
@ -141,7 +150,7 @@ class CannyEdgeMachine {
sum_intensity = 0;
for(int i=0; i<gradiant_size; i++) {
int dy = i - gradiant_offset;
QColor color = QColor::fromRgb(this->original->getPixel(x, y+dy, LazyImage::DEFAULT));
QColor color = QColor::fromRgb(this->working_copy->getPixel(x, y+dy, LazyImage::DEFAULT));
color.getHsl(&h, &s, &l);
sum_intensity += l * gradiant_vector[i];
}
@ -271,7 +280,7 @@ class CannyEdgeMachine {
void work() {
this->reset();
this->doGaussBlur(this->filter_size); // uses filter_size
this->doGaussBlur(); // uses filter_size, filter_sigma
this->doGradiants();
this->doGradiantMagnitude();
// TODO: Checkpoint for 'before t_low changed'

11
imageviewer-qt4.cpp
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@ -651,11 +651,12 @@ void ImageViewer::applyBasicFilterWithOverflowHandling() {
void ImageViewer::runCannyEdge(void) {
CannyEdgeMachine cem = CannyEdgeMachine(original, working_copy);
int filter_size = gauss_filter_size->value();
double filter_sigma = gauss_filter_sigma->value();
double t_low = t_low_spinbox->value();
double t_high = t_high_spinbox->value();
logFile << "Canny-Edge using N*N filter size: " << filter_size << ", and thresholds: " << t_low << ", " << t_high << std::endl;
logFile << "Canny-Edge using N*N filter size: " << filter_size << ", filter sigma: " << filter_sigma << ", and thresholds: " << t_low << ", " << t_high << std::endl;
renewLogging();
cem.setGaussFilterSize(filter_size);
cem.setGaussFilterParams(filter_size, filter_sigma);
cem.setThresholdValues(t_low, t_high);
cem.work();
updateImageDisplay();
@ -929,6 +930,10 @@ void ImageViewer::generateControlPanels() {
gauss_filter_size->setMinimum(3);
gauss_filter_size->setValue(3);
gauss_filter_sigma = new QDoubleSpinBox();
gauss_filter_sigma->setDecimals(5);
gauss_filter_sigma->setValue(1.4);
t_low_spinbox = new QDoubleSpinBox();
t_low_spinbox->setDecimals(5);
t_low_spinbox->setValue(2.0);
@ -939,6 +944,8 @@ void ImageViewer::generateControlPanels() {
task_tab5_scrolllayout->addWidget(new QLabel("Gauss filter size (NxN)"));
task_tab5_scrolllayout->addWidget(gauss_filter_size);
task_tab5_scrolllayout->addWidget(new QLabel("Gauss filter sigma"));
task_tab5_scrolllayout->addWidget(gauss_filter_sigma);
task_tab5_scrolllayout->addWidget(new QLabel("Low threshold value"));
task_tab5_scrolllayout->addWidget(t_low_spinbox);
task_tab5_scrolllayout->addWidget(new QLabel("High threshold value"));

1
imageviewer-qt4.h
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@ -148,6 +148,7 @@ class ImageViewer : public QMainWindow {
QVBoxLayout* task_tab5_scrolllayout;
QDoubleSpinBox* gauss_filter_size;
QDoubleSpinBox* gauss_filter_sigma;
QDoubleSpinBox* t_low_spinbox;
QDoubleSpinBox* t_high_spinbox;
QPushButton* run_canny_edge;