[英]CS50 Pset4 Filter (less comfortable) blur function Algorithmic Issue
当我尝试实现模糊 function 时,它在图片上对我来说效果很好,但是 check50(cs50 测试程序)对我的输出发出警告。
这是我的代码
void blur(int height, int width, RGBTRIPLE image[height][width])
{
float average_red = 0;
float average_green = 0;
float average_blue = 0;
float count = 0;
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
// reset values
average_red = 0;
average_blue = 0;
average_green = 0;
count = 0;
// look for around a pixel 3x3 box
// column
for (int k = i - 1; k < i + 2; k++)
{
// row
for (int l = j - 1; l < j + 2; l++)
{
// if pixel on the top
if (k == -1)
{
// it skips a column because it is out of the border
break;
}
// if pixel is on the left side
if (l == -1)
{
// skips a row otherwise it is out of the border
continue;
}
// if pixel passes the bottom
if (k >= height)
{
break;
}
// if pixels passes the right side
if (l >= width)
{
continue;
}
// everything else
else
{
average_red += image[k][l].rgbtRed;
average_green += image[k][l].rgbtGreen;
average_blue += image[k][l].rgbtBlue;
count++;
}
}
}
average_red /= count;
average_green /= count;
average_blue /= count;
image[i][j].rgbtRed = round(average_red);
image[i][j].rgbtGreen = round(average_green);
image[i][j].rgbtBlue = round(average_blue);
}
}
return;
}
预计 output 与我的 output 在这里(模糊功能 output 非常下方)
它在拐角处工作正常,但其他像素值非常接近正确的 output,但不一样。 任何帮助表示赞赏
代码需要考虑几个因素。 建议:
如果生成的行号为 <0 或 >(height-1) 则不计算该像素
如果生成的列号为 <0 或 >(width-1) 则不计算该像素
因此,对于周围的 8 个像素中的每一个,应用上述两个标准。
我解决了自己的问题,无论如何感谢您的帮助
问题是我的总和计算。 它将结果保留在 image[i][j] 中,然后再次使用该值。 我将图像值复制到一个新值并用于此。 这是我的代码
void blur(int height, int width, RGBTRIPLE image[height][width])
{
// copy original value to a new value to keep changing values
RGBTRIPLE copy[height][width];
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
copy[i][j] = image[i][j];
}
}
float average_red = 0.0f;
float average_green = 0.0f;
float average_blue = 0.0f;
float count = 0;
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
// reset values
average_red = 0.0f;
average_blue = 0.0f;
average_green = 0.0f;
count = 0;
// look for around a pixel 3x3 box
// column
for (int k = i - 1; k < i + 2; k++)
{
// row
for (int l = j - 1; l < j + 2; l++)
{
// if pixel on the top
if (k == -1)
{
// it skips a column because it is out of the border
break;
}
// if pixel is on the left side
else if (l == -1)
{
// skips a row otherwise it is out of the border
continue;
}
// if pixel passes the bottom
else if (k >= height)
{
break;
}
// if pixels passes the right side
else if (l >= width)
{
continue;
}
// everything else
else
{
average_red += copy[k][l].rgbtRed;
average_green += copy[k][l].rgbtGreen;
average_blue += copy[k][l].rgbtBlue;
count++;
}
}
}
average_red /= count;
average_green /= count;
average_blue /= count;
image[i][j].rgbtRed = round(average_red);
image[i][j].rgbtGreen = round(average_green);
image[i][j].rgbtBlue = round(average_blue);
}
}
return;
}
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