如何解决CS50 过滤器“边缘”返回白色图像
我一直在研究哈佛的 CS50“过滤器”问题，并且在 edges 部分遇到了一些问题。
我一直在尝试使用这个算法来解决它：
- 逐个像素地浏览整个图像。图像是一个
RGBTRIPLE类型的矩阵，称为image[height][width] - 检查当前像素是一个角，是在边缘还是在中间的某个地方（“其他”情况）
- 将该像素以及“邻居”像素与相应的
g(x)和g(y)值相乘，计算g(x)^2 + g(y)^2的平方根，相应地将其四舍五入，然后将该值导出到另一个矩阵image2[height][width]。
我在下面提供的代码是我解决问题的尝试。我使用了与 blur 算法中相同的验证（检查角、边缘或中间），并且奏效了。
// Detect edges
void edges(int height,int width,RGBTRIPLE image[height][width])
{
RGBTRIPLE gx,gy;
RGBTRIPLE image2[height][width];
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
gx.rgbtRed = 0;
gx.rgbtGreen = 0;
gx.rgbtBlue = 0;
gy.rgbtRed = 0;
gy.rgbtGreen = 0;
gy.rgbtBlue = 0;
if (i == 0 && j == 0)
{
gx.rgbtRed += 0 * image[i][j].rgbtRed;
gx.rgbtGreen += 0 * image[i][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i][j].rgbtBlue;
gy.rgbtRed += 0 * image[i][j].rgbtRed;
gy.rgbtGreen += 0 * image[i][j].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j].rgbtBlue;
gx.rgbtRed += 0 * image[i+1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i+1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i+1][j].rgbtBlue;
gy.rgbtRed += 2 * image[i+1][j].rgbtRed;
gy.rgbtGreen += 2 * image[i+1][j].rgbtGreen;
gy.rgbtBlue += 2 * image[i+1][j].rgbtBlue;
gx.rgbtRed += 2 * image[i][j+1].rgbtRed;
gx.rgbtGreen += 2 * image[i][j+1].rgbtGreen;
gx.rgbtBlue += 2 * image[i][j+1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j+1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j+1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j+1].rgbtBlue;
gx.rgbtRed += image[i+1][j+1].rgbtRed;
gx.rgbtGreen += image[i+1][j+1].rgbtGreen;
gx.rgbtBlue += image[i+1][j+1].rgbtBlue;
gy.rgbtRed += image[i+1][j+1].rgbtRed;
gy.rgbtGreen += image[i+1][j+1].rgbtGreen;
gy.rgbtBlue += image[i+1][j+1].rgbtBlue;
}
else if (i == 0 && j == width-1)
{
gx.rgbtRed += 0 * image[i][j].rgbtRed;
gx.rgbtGreen += 0 * image[i][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i][j].rgbtBlue;
gy.rgbtRed += 0 * image[i][j].rgbtRed;
gy.rgbtGreen += 0 * image[i][j].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j].rgbtBlue;
gx.rgbtRed += -2 * image[i][j-1].rgbtRed;
gx.rgbtGreen += -2 * image[i][j-1].rgbtGreen;
gx.rgbtBlue += -2 * image[i][j-1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j-1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j-1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j-1].rgbtBlue;
gx.rgbtRed += 0 * image[i+1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i+1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i+1][j].rgbtBlue;
gy.rgbtRed += 2 * image[i+1][j].rgbtRed;
gy.rgbtGreen += 2 * image[i+1][j].rgbtGreen;
gy.rgbtBlue += 2 * image[i+1][j].rgbtBlue;
gx.rgbtRed += -1 * image[i+1][j-1].rgbtRed;
gx.rgbtGreen += -1 * image[i+1][j-1].rgbtGreen;
gx.rgbtBlue += -1 * image[i+1][j-1].rgbtBlue;
gy.rgbtRed += image[i+1][j-1].rgbtRed;
gy.rgbtGreen += image[i+1][j-1].rgbtGreen;
gy.rgbtBlue += image[i+1][j-1].rgbtBlue;
}
else if (i == height-1 && j == 0)
{
gx.rgbtRed += 0 * image[i][j].rgbtRed;
gx.rgbtGreen += 0 * image[i][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i][j].rgbtBlue;
gy.rgbtRed += 0 * image[i][j].rgbtRed;
gy.rgbtGreen += 0 * image[i][j].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j].rgbtBlue;
gx.rgbtRed += 0 * image[i-1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i-1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i-1][j].rgbtBlue;
gy.rgbtRed += -2 * image[i-1][j].rgbtRed;
gy.rgbtGreen += -2 * image[i-1][j].rgbtGreen;
gy.rgbtBlue += -2 * image[i-1][j].rgbtBlue;
gx.rgbtRed += image[i-1][j+1].rgbtRed;
gx.rgbtGreen += image[i-1][j+1].rgbtGreen;
gx.rgbtBlue += image[i-1][j+1].rgbtBlue;
gy.rgbtRed += -1 * image[i][j].rgbtRed;
gy.rgbtGreen += -1 * image[i][j].rgbtGreen;
gy.rgbtBlue += -1 * image[i][j].rgbtBlue;
gx.rgbtRed += 2 * image[i][j+1].rgbtRed;
gx.rgbtGreen += 2 * image[i][j+1].rgbtGreen;
gx.rgbtBlue += 2 * image[i][j+1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j+1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j+1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j+1].rgbtBlue;
}
else if (i == height-1 && j == width-1)
{
gx.rgbtRed += 0 * image[i][j].rgbtRed;
gx.rgbtGreen += 0 * image[i][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i][j].rgbtBlue;
gy.rgbtRed += 0 * image[i][j].rgbtRed;
gy.rgbtGreen += 0 * image[i][j].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j].rgbtBlue;
gx.rgbtRed += 0 * image[i-1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i-1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i-1][j].rgbtBlue;
gy.rgbtRed += -2 * image[i-1][j].rgbtRed;
gy.rgbtGreen += -2 * image[i-1][j].rgbtGreen;
gy.rgbtBlue += -2 * image[i-1][j].rgbtBlue;
gx.rgbtRed += -1 * image[i-1][j-1].rgbtRed;
gx.rgbtGreen += -1 * image[i-1][j-1].rgbtGreen;
gx.rgbtBlue += -1 * image[i-1][j-1].rgbtBlue;
gy.rgbtRed += -1 * image[i-1][j-1].rgbtRed;
gy.rgbtGreen += -1 * image[i-1][j-1].rgbtGreen;
gy.rgbtBlue += -1 * image[i-1][j-1].rgbtBlue;
gx.rgbtRed += -2 * image[i][j-1].rgbtRed;
gx.rgbtGreen += -2 * image[i][j-1].rgbtGreen;
gx.rgbtBlue += -2 * image[i][j-1].rgbtBlue;
gy.rgbtRed += 0 * image[i-1][j-1].rgbtRed;
gy.rgbtGreen += 0 * image[i-1][j-1].rgbtGreen;
gy.rgbtBlue += 0 * image[i-1][j-1].rgbtBlue;
}
else if (i == 0)
{
gx.rgbtRed += 0 * image[i][j].rgbtRed;
gx.rgbtGreen += 0 * image[i][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i][j].rgbtBlue;
gy.rgbtRed += 0 * image[i][j].rgbtRed;
gy.rgbtGreen += 0 * image[i][j].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j].rgbtBlue;
gx.rgbtRed += -2 * image[i][j-1].rgbtRed;
gx.rgbtGreen += -2 * image[i][j-1].rgbtGreen;
gx.rgbtBlue += -2 * image[i][j-1].rgbtBlue;
gy.rgbtRed += image[i][j-1].rgbtRed;
gy.rgbtGreen += image[i][j-1].rgbtGreen;
gy.rgbtBlue += image[i][j-1].rgbtBlue;
gx.rgbtRed += -1 * image[i+1][j-1].rgbtRed;
gx.rgbtGreen += -1 * image[i+1][j-1].rgbtGreen;
gx.rgbtBlue += -1 * image[i+1][j-1].rgbtBlue;
gy.rgbtRed += image[i+1][j-1].rgbtRed;
gy.rgbtGreen += image[i+1][j-1].rgbtGreen;
gy.rgbtBlue += image[i+1][j-1].rgbtBlue;
gx.rgbtRed += 0 * image[i+1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i+1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i+1][j].rgbtBlue;
gy.rgbtRed += 2 * image[i+1][j].rgbtRed;
gy.rgbtGreen += 2 * image[i+1][j].rgbtGreen;
gy.rgbtBlue += 2 * image[i+1][j].rgbtBlue;
gx.rgbtRed += image[i+1][j+1].rgbtRed;
gx.rgbtGreen += image[i+1][j+1].rgbtGreen;
gx.rgbtBlue += image[i+1][j+1].rgbtBlue;
gy.rgbtRed += image[i+1][j+1].rgbtRed;
gy.rgbtGreen += image[i+1][j+1].rgbtGreen;
gy.rgbtBlue += image[i+1][j+1].rgbtBlue;
gx.rgbtRed += 2 * image[i][j+1].rgbtRed;
gx.rgbtGreen += 2 * image[i][j+1].rgbtGreen;
gx.rgbtBlue += 2 * image[i][j+1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j+1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j+1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j+1].rgbtBlue;
}
else if (i == height-1)
{
gx.rgbtRed += 0 * image[i][j].rgbtRed;
gx.rgbtGreen += 0 * image[i][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i][j].rgbtBlue;
gy.rgbtRed += 0 * image[i][j].rgbtRed;
gy.rgbtGreen += 0 * image[i][j].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j].rgbtBlue;
gx.rgbtRed += -2 * image[i][j-1].rgbtRed;
gx.rgbtGreen += -2 * image[i][j-1].rgbtGreen;
gx.rgbtBlue += -2 * image[i][j-1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j-1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j-1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j-1].rgbtBlue;
gx.rgbtRed += -1 * image[i-1][j-1].rgbtRed;
gx.rgbtGreen += -1 * image[i-1][j-1].rgbtGreen;
gx.rgbtBlue += -1 * image[i-1][j-1].rgbtBlue;
gy.rgbtRed += -1 * image[i-1][j-1].rgbtRed;
gy.rgbtGreen += -1 * image[i-1][j-1].rgbtGreen;
gy.rgbtBlue += -1 * image[i-1][j-1].rgbtBlue;
gx.rgbtRed += 0 * image[i-1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i-1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i-1][j].rgbtBlue;
gy.rgbtRed += -2 * image[i-1][j].rgbtRed;
gy.rgbtGreen += -2 * image[i-1][j].rgbtGreen;
gy.rgbtBlue += -2 * image[i-1][j].rgbtBlue;
gx.rgbtRed += image[i-1][j+1].rgbtRed;
gx.rgbtGreen += image[i-1][j+1].rgbtGreen;
gx.rgbtBlue += image[i-1][j+1].rgbtBlue;
gy.rgbtRed += 0 * image[i-1][j+1].rgbtRed;
gy.rgbtGreen += 0 * image[i-1][j+1].rgbtGreen;
gy.rgbtBlue += 0 * image[i-1][j+1].rgbtBlue;
gx.rgbtRed += 2 * image[i][j+1].rgbtRed;
gx.rgbtGreen += 2 * image[i][j+1].rgbtGreen;
gx.rgbtBlue += 2 * image[i][j+1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j+1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j+1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j+1].rgbtBlue;
}
else if (j == 0)
{
gx.rgbtRed += 0 * image[i][j].rgbtRed;
gx.rgbtGreen += 0 * image[i][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i][j].rgbtBlue;
gy.rgbtRed += 0 * image[i][j].rgbtRed;
gy.rgbtGreen += 0 * image[i][j].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j].rgbtBlue;
gx.rgbtRed += 0 * image[i-1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i-1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i-1][j].rgbtBlue;
gy.rgbtRed += -2 * image[i-1][j].rgbtRed;
gy.rgbtGreen += -2 * image[i-1][j].rgbtGreen;
gy.rgbtBlue += -2 * image[i-1][j].rgbtBlue;
gx.rgbtRed += image[i-1][j+1].rgbtRed;
gx.rgbtGreen += image[i-1][j+1].rgbtGreen;
gx.rgbtBlue += image[i-1][j+1].rgbtBlue;
gy.rgbtRed += -1 * image[i-1][j+1].rgbtRed;
gy.rgbtGreen += -1 * image[i-1][j+1].rgbtGreen;
gy.rgbtBlue += -1 * image[i-1][j+1].rgbtBlue;
gx.rgbtRed += 2 * image[i][j+1].rgbtRed;
gx.rgbtGreen += 2 * image[i][j+1].rgbtGreen;
gx.rgbtBlue += 2 * image[i][j+1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j+1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j+1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j+1].rgbtBlue;
gx.rgbtRed += image[i+1][j+1].rgbtRed;
gx.rgbtGreen += image[i+1][j+1].rgbtGreen;
gx.rgbtBlue += image[i+1][j+1].rgbtBlue;
gy.rgbtRed += image[i+1][j+1].rgbtRed;
gy.rgbtGreen += image[i+1][j+1].rgbtGreen;
gy.rgbtBlue += image[i+1][j+1].rgbtBlue;
gx.rgbtRed += 0 * image[i+1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i+1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i+1][j].rgbtBlue;
gy.rgbtRed += 2 * image[i+1][j].rgbtRed;
gy.rgbtGreen += 2 * image[i+1][j].rgbtGreen;
gy.rgbtBlue += 2 * image[i+1][j].rgbtBlue;
}
else if (j == width-1)
{
gx.rgbtRed += 0 * image[i][j].rgbtRed;
gx.rgbtGreen += 0 * image[i][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i][j].rgbtBlue;
gy.rgbtRed += 0 * image[i][j].rgbtRed;
gy.rgbtGreen += 0 * image[i][j].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j].rgbtBlue;
gx.rgbtRed += 0 * image[i-1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i-1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i-1][j].rgbtBlue;
gy.rgbtRed += -2 * image[i-1][j].rgbtRed;
gy.rgbtGreen += -2 * image[i-1][j].rgbtGreen;
gy.rgbtBlue += -2 * image[i-1][j].rgbtBlue;
gx.rgbtRed += -1 * image[i-1][j-1].rgbtRed;
gx.rgbtGreen += -1 * image[i-1][j-1].rgbtGreen;
gx.rgbtBlue += -1 * image[i-1][j-1].rgbtBlue;
gy.rgbtRed += -1 * image[i-1][j-1].rgbtRed;
gy.rgbtGreen += -1 * image[i-1][j-1].rgbtGreen;
gy.rgbtBlue += -1 * image[i-1][j-1].rgbtBlue;
gx.rgbtRed += -2 * image[i][j-1].rgbtRed;
gx.rgbtGreen += -2 * image[i][j-1].rgbtGreen;
gx.rgbtBlue += -2 * image[i][j-1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j-1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j-1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j-1].rgbtBlue;
gx.rgbtRed += -1 * image[i+1][j-1].rgbtRed;
gx.rgbtGreen += -1 * image[i+1][j-1].rgbtGreen;
gx.rgbtBlue += -1 * image[i+1][j-1].rgbtBlue;
gy.rgbtRed += image[i+1][j-1].rgbtRed;
gy.rgbtGreen += image[i+1][j-1].rgbtGreen;
gy.rgbtBlue += image[i+1][j-1].rgbtBlue;
gx.rgbtRed += 0 * image[i+1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i+1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i+1][j].rgbtBlue;
gy.rgbtRed += 2 * image[i+1][j].rgbtRed;
gy.rgbtGreen += 2 * image[i+1][j].rgbtGreen;
gy.rgbtBlue += 2 * image[i+1][j].rgbtBlue;
}
else
{
gx.rgbtRed += 0 * image[i][j].rgbtRed;
gx.rgbtGreen += 0 * image[i][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i][j].rgbtBlue;
gy.rgbtRed += 0 * image[i][j].rgbtRed;
gy.rgbtGreen += 0 * image[i][j].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j].rgbtBlue;
gx.rgbtRed += -1 * image[i-1][j-1].rgbtRed;
gx.rgbtGreen += -1 * image[i-1][j-1].rgbtGreen;
gx.rgbtBlue += -1 * image[i-1][j-1].rgbtBlue;
gy.rgbtRed += -1 * image[i-1][j-1].rgbtRed;
gy.rgbtGreen += -1 * image[i-1][j-1].rgbtGreen;
gy.rgbtBlue += -1 * image[i-1][j-1].rgbtBlue;
gx.rgbtRed += 0 * image[i-1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i-1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i-1][j].rgbtBlue;
gy.rgbtRed += -2 * image[i-1][j].rgbtRed;
gy.rgbtGreen += -2 * image[i-1][j].rgbtGreen;
gy.rgbtBlue += -2 * image[i-1][j].rgbtBlue;
gx.rgbtRed += image[i-1][j+1].rgbtRed;
gx.rgbtGreen += image[i-1][j+1].rgbtGreen;
gx.rgbtBlue += image[i-1][j+1].rgbtBlue;
gy.rgbtRed += -1 * image[i-1][j+1].rgbtRed;
gy.rgbtGreen += -1 * image[i-1][j+1].rgbtGreen;
gy.rgbtBlue += -1 * image[i-1][j+1].rgbtBlue;
gx.rgbtRed += -2 * image[i][j-1].rgbtRed;
gx.rgbtGreen += -2 * image[i][j-1].rgbtGreen;
gx.rgbtBlue += -2 * image[i][j-1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j-1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j-1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j-1].rgbtBlue;
gx.rgbtRed += 2 * image[i][j+1].rgbtRed;
gx.rgbtGreen += 2 * image[i][j+1].rgbtGreen;
gx.rgbtBlue += 2 * image[i][j+1].rgbtBlue;
gy.rgbtRed += 0 * image[i][j+1].rgbtRed;
gy.rgbtGreen += 0 * image[i][j+1].rgbtGreen;
gy.rgbtBlue += 0 * image[i][j+1].rgbtBlue;
gx.rgbtRed += -1 * image[i+1][j-1].rgbtRed;
gx.rgbtGreen += -1 * image[i+1][j-1].rgbtGreen;
gx.rgbtBlue += -1 * image[i+1][j-1].rgbtBlue;
gy.rgbtRed += image[i+1][j-1].rgbtRed;
gy.rgbtGreen += image[i+1][j-1].rgbtGreen;
gy.rgbtBlue += image[i+1][j-1].rgbtBlue;
gx.rgbtRed += 0 * image[i+1][j].rgbtRed;
gx.rgbtGreen += 0 * image[i+1][j].rgbtGreen;
gx.rgbtBlue += 0 * image[i+1][j].rgbtBlue;
gy.rgbtRed += 2 * image[i+1][j].rgbtRed;
gy.rgbtGreen += 2 * image[i+1][j].rgbtGreen;
gy.rgbtBlue += 2 * image[i+1][j].rgbtBlue;
gx.rgbtRed += image[i+1][j+1].rgbtRed;
gx.rgbtGreen += image[i+1][j+1].rgbtGreen;
gx.rgbtBlue += image[i+1][j+1].rgbtBlue;
gy.rgbtRed += image[i+1][j+1].rgbtRed;
gy.rgbtGreen += image[i+1][j+1].rgbtGreen;
gy.rgbtBlue += image[i+1][j+1].rgbtBlue;
}
int redVal = (int)round(sqrt(gx.rgbtRed * gx.rgbtRed + gy.rgbtRed * gy.rgbtRed));
int greenVal = (int)round(sqrt(gx.rgbtGreen * gx.rgbtGreen + gy.rgbtGreen * gy.rgbtGreen));
int blueVal = (int)round(sqrt(gx.rgbtBlue * gx.rgbtBlue + gy.rgbtBlue * gy.rgbtBlue));
if (redVal > 255) redVal = 255;
if (greenVal > 255) greenVal = 255;
if (blueVal > 255) blueVal = 255;
image2[i][j].rgbtRed = redVal;
image2[i][j].rgbtGreen = greenVal;
image2[i][j].rgbtBlue = blueVal;
}
}
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
image[i][j].rgbtRed = image2[i][j].rgbtRed;
image[i][j].rgbtGreen = image2[i][j].rgbtGreen;
image[i][j].rgbtBlue = image2[i][j].rgbtBlue;
}
}
return;
}
我的代码有很多行，因为它多次使用相同的操作（这是我设法解决问题的最简单方法）。
此外，if 语句中乘法的常量只是矩阵 gx 和 gy 的元素。我无缘无故地用 gx 和 gy 表示这些乘法的结果。我不想为这两个声明两个单独的矩阵，所以我对它们进行了硬编码。
我什至尝试手动验证自己，并使用 printf() 检查角是否正确识别，并且一切正常。
问题是，当我使用 check50 时，这是我的输出：
此外，所提供的名为 yard.bmp 的图像被转换为“yardEdges.bmp”，如下所示：
从我的角度来看，有很多白色，我无法从这张图片中识别出任何边缘。
首先，请不要评判我的编码方式，我只是发现这是解决“边缘”的最简单（也是最长和最无聊）的方法。
此外，我认为验证（代码中的这 9 个 if 语句）不会导致任何问题，也不会导致任何问题（乘法等）。我手工验证了所有这些，我很确定它们是对的（不过我可能是错的）。
我不是要求有人验证这些陈述。我只是好奇我做错了什么，也许有人可以看到我没有看到的东西。
谢谢！
解决方法
您在计算中使用了错误的数据类型：
RGBTRIPLE gx,gy;
这种类型能够为每个通道保存 8 位值。
当您为每个通道添加单独的组件时，您可以轻松地在一个或多个通道中溢出。这会阻止您将每个频道限制为 255 之后的尝试。
为了避免这种情况，只需创建另一个结构：
struct {
uint32_t rgbtRed;
uint32_t rgbtGreen;
uint32_t rgbtBlue;
} gx,gy;
这将允许相加而不会溢出。
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