73 lines
1.6 KiB
C++
73 lines
1.6 KiB
C++
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#include "bin_gradient.h"
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using namespace std;
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BinarizationGradient::BinarizationGradient(PNM* img) :
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Transformation(img)
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{
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}
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BinarizationGradient::BinarizationGradient(PNM* img, ImageViewer* iv) :
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Transformation(img, iv)
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{
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}
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PNM* BinarizationGradient::transform()
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{
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int width = image->width();
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int height = image->height();
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PNM* newImage = new PNM(width, height, QImage::Format_Mono);
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// Create variables
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// The pixel value at point (i,j)
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float I=0;
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// The first component of the gradient at point (i,j)
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float Gx=0;
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// The second component of the gradient at point (i,j)
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float Gy=0;
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for (int x=0; x < width; x++)
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{
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for(int y=0; y < height; y++)
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{
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// Get current pixel value
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QRgb pixel = image->pixel(x, y);
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I = qGray(pixel);
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// Calculate Gx
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Gx = Gx + (I * qGray(image->pixel(x+1, y)) - I * qGray(image->pixel(x-1, y)));
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//Calculate Gy
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Gy = Gy + (I * qGray(image->pixel(x, y+1)) - I * qGray(image->pixel(x, y-1)));
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}
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}
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// Calculate T
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float T = (max(Gx, Gy) * I) / max(Gx, Gy);
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// Iterate over pixels
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for (int x=0; x < width; x++)
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{
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for (int y=0; y < height; y++)
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{
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// Get current pixel
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QRgb pixel = image->pixel(x, y);
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if(qGray(pixel) > T)
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{
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newImage->setPixel(x, y, Qt::color1);
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}
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else
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{
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newImage->setPixel(x, y, Qt::color0);
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}
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}
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}
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return newImage;
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}
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