s416199/lpo-image-processing
1
0
Fork 0
Code Releases 1 Activity

Fix bin_gradient.cpp

Browse Source
This commit is contained in:
Jarosław Wieczorek 2021-04-15 20:32:58 +02:00
parent e657afd5ae
commit b801fbda96
1 changed files with 43 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
app/cpp/mysimplegimp/src/core/transformations/bin_gradient.cpp
View File

@ -17,51 +17,62 @@ PNM* BinarizationGradient::transform()
int height = image->height();
PNM* newImage = new PNM(width, height, QImage::Format_Mono);
int numerator = 0;
int denominator = 0;
// Create variables
// The pixel value at point (i,j)
float I=0;
// Gx
int Gx = 0;
// The first component of the gradient at point (i,j)
float Gx=0;
// Gy
int Gy = 0;
// The second component of the gradient at point (i,j)
float Gy=0;
int G = 0;
int T = 0;
//PNM* newImage = new PNM(width, height, QImage::Format_Mono);
for (int x=0; x < width; x++)
for (int x = 0; x < width; x++)
{
for(int y=0; y < height; y++)
for (int y = 0; y < height; y++)
{
// Get current pixel value
QRgb pixel = image->pixel(x, y);
I = qGray(pixel);
Mode mode = Transformation::RepeatEdge;
int I = qGray(getPixel(x, y, mode));
// Calculate Gx
Gx = Gx + (I * qGray(image->pixel(x+1, y)) - I * qGray(image->pixel(x-1, y)));
// Get Gx and Gy
Gx = qGray(getPixel(x + 1, y, mode)) - qGray(getPixel(x - 1, y, mode));
Gy = qGray(getPixel(x, y + 1, mode)) - qGray(getPixel(x, y - 1, mode));
//Calculate Gy
Gy = Gy + (I * qGray(image->pixel(x, y+1)) - I * qGray(image->pixel(x, y-1)));
}
}
// Calculate T
float T = (max(Gx, Gy) * I) / max(Gx, Gy);
// Iterate over pixels
for (int x=0; x < width; x++)
{
for (int y=0; y < height; y++)
{
// Get current pixel
QRgb pixel = image->pixel(x, y);
if(qGray(pixel) > T)
if (Gx > Gy)
{
newImage->setPixel(x, y, Qt::color1);
G = Gx;
}
else
{
newImage->setPixel(x, y, Qt::color0);
G = Gy;
}
numerator += I * G;
denominator += G;
}
}
T = numerator / denominator;
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
Mode mode = Transformation::RepeatEdge;
QRgb pixel = getPixel(x, y, mode);
int val = qGray(pixel);
if (val < T)
{
newImage->setPixel(x, y, 0);
}
else
{
newImage->setPixel(x, y, 1);
}
}
}