106 lines
2.3 KiB
C++
106 lines
2.3 KiB
C++
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#include "edge_gradient.h"
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EdgeGradient::EdgeGradient(PNM* img, ImageViewer* iv) :
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Convolution(img, iv)
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{
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}
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EdgeGradient::EdgeGradient(PNM* img) :
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Convolution(img)
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{
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}
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PNM* EdgeGradient::verticalDetection()
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{
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return convolute(g_y, RepeatEdge);
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}
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PNM* EdgeGradient::horizontalDetection()
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{
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return convolute(g_x, RepeatEdge);
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}
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int EdgeGradient::calcValue(int i, int j, Channel channel, PNM* img_x, PNM* img_y)
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{
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int value_x, value_y;
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double power_x, power_y;
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int value_xy;
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int result;
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QRgb pixel_x = img_x->pixel(i, j);
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QRgb pixel_y = img_y->pixel(i, j);
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switch(channel)
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{
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case RChannel:
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value_x = qRed(pixel_x);
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value_y = qRed(pixel_y);
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break;
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case GChannel:
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value_x = qGreen(pixel_x);
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value_y = qGreen(pixel_y);
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break;
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case BChannel:
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value_x = qBlue(pixel_x);
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value_y = qBlue(pixel_y);
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break;
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case LChannel:
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value_x = qGray(pixel_x);
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value_y = qGray(pixel_y);
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break;
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}
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power_x = pow(value_x, 2);
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power_y = pow(value_y, 2);
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value_xy = (int) sqrt(power_x + power_y);
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result = std::max(0, std::min(255, value_xy));
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return result;
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}
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PNM* EdgeGradient::transform()
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{
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PNM* newImage = new PNM(image->width(), image->height(), image->format());
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int width = image->width();
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int height = image->height();
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// Gradient image by x
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PNM* img_x = horizontalDetection();
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// Gradient image by y
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PNM* img_y = verticalDetection();
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for (int i = 0; i < width; i++)
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{
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for (int j = 0; j < height; j++)
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{
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if (image->format() == QImage::Format_Indexed8)
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{
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// Calculate gray pixel value
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int l = calcValue(i, j, LChannel, img_x, img_y);
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newImage->setPixel(i, j, l);
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}
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else
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{
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// Calculate RGB values for pixel
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int r = calcValue(i, j, RChannel, img_x, img_y);
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int g = calcValue(i, j, GChannel, img_x, img_y);
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int b = calcValue(i, j, BChannel, img_x, img_y);
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QColor color = QColor(r, g, b);
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newImage->setPixel(i, j, color.rgb());
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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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