47 lines
937 B
C++
47 lines
937 B
C++
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#include "blur_gaussian.h"
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BlurGaussian::BlurGaussian(PNM* img) :
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Convolution(img)
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{
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}
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BlurGaussian::BlurGaussian(PNM* img, ImageViewer* iv) :
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Convolution(img, iv)
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{
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}
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PNM* BlurGaussian::transform()
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{
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emit message("Blurring...");
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int size = getParameter("size").toInt();
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radius = (size/2)+1;
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sigma = getParameter("sigma").toDouble();
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return convolute(getMask(size, Normalize), RepeatEdge);
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}
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math::matrix<float> BlurGaussian::getMask(int size, Mode)
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{
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math::matrix<float> mask(size, size);
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for (int i = 0; i < size; i++)
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{
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for (int j = 0; j < size; j++)
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{
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mask(i,j) = getGauss(i-radius, j-radius, sigma);
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}
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}
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return mask;
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}
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float BlurGaussian::getGauss(int x, int y, float sigma)
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{
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// Calculate a two-dimensional Gaussian function:
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return (1 / (2 * M_PI * pow(sigma, 2))) * exp(-(pow(x, 2) + pow(y, 2)) / (2 * pow(sigma, 2)));
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}
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