c - CS50 滤镜“边缘”返回白色图像
问题描述
我一直在研究哈佛的 CS50 '过滤器'问题，并且在这方面有点卡住了edges。
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。图像是一个类型
RGBTRIPLE称为矩阵image[height][width] - 检查当前像素是一个角落，只是在边缘还是在中间的某个地方（“其他”情况）
- 将该像素以及“相邻”像素与相应的
g(x)和g(y)值相乘，计算 的平方根g(x)^2 + g(y)^2，相应地对其进行四舍五入，然后将该值导出到另一个矩阵image2[height][width]中。
我在下面提供的代码是我解决问题的尝试。我使用了与算法相同的验证（检查角、边缘或中间）blur，并且它起作用了。
// 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，语句中乘法的常数if只是矩阵gx和的元素gy。我表示这些乘法的结果是有理由的，gx也gy没有理由的。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，并检查是否使用 正确识别角落printf()，并且一切正常。
问题是，当我使用 时check50，这是我的输出：
此外，提供的名为的图像yard.bmp被转换为如下所示的“yardEdges.bmp”：
从我的角度来看，那是很多白色，我无法从这张照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）的方式。
此外，我不认为验证（if代码中的这 9 个语句）会导致任何问题，也不会导致任何问题（乘法等）。我手动验证了所有这些，我很确定它们是正确的（不过我可能是错的）。
我不是要求某人验证这些陈述。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！
解决方案
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，您很容易在一个或多个通道中出现溢出。这会挫败您将每个频道限制在以后的尝试255。
为避免这种情况，只需创建另一个结构：
struct {
uint32_t rgbtRed;
uint32_t rgbtGreen;
uint32_t rgbtBlue;
} gx,gy;
这将允许加起来而不会溢出。
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