EdgeDetect
Sobel
Input：
Output:
Input:
Output:
Input:
Output:
static void sobel(std::shared_ptr<PrimitiveObject> & grayImage, int width, int height, std::vector<float>& dx, std::vector<float>& dy)
{
dx.resize(width * height);
dy.resize(width * height);
for (int y = 1; y < height - 1; y++) {
for (int x = 1; x < width - 1; x++) {
float gx = -grayImage->verts[(y - 1) * width + x - 1][0] + grayImage->verts[(y - 1) * width + x + 1][0]
- 2.0f * grayImage->verts[y * width + x - 1][0] + 2.0f * grayImage->verts[y * width + x + 1][0]
- grayImage->verts[(y + 1) * width + x - 1][0] + grayImage->verts[(y + 1) * width + x + 1][0];
float gy = grayImage->verts[(y - 1) * width + x - 1][0] + 2.0f * grayImage->verts[(y - 1) * width + x][0] +
grayImage->verts[(y - 1) * width + x + 1][0]
- grayImage->verts[(y + 1) * width + x - 1][0] - 2.0f * grayImage->verts[(y + 1) * width + x][0] -
grayImage->verts[(y + 1) * width + x + 1][0];
dx[y * width + x] = gx;
dy[y * width + x] = gy;
}
}
}