cs50 滤镜（模糊）分配 (pset4)
[英]cs50 filter(blur) assignment (pset4)
问题描述
I am doing a cs50 assignment filter(blur).
我正在做一个 cs50 分配过滤器（模糊）。 i didnt do it really well but it is working.我没有做得很好，但它正在工作。 bluring all the pixels except the first row(north) and the final row (south) in the pic.模糊图片中除第一行（北）和最后一行（南）以外的所有像素。 and the corners of the picture are blured but the pixels after the corners the colors are really unusual.并且图片的角落模糊但角落后的像素 colors 确实不寻常。 i dont know its the conditions or the the color changing that messed this up.我不知道是条件还是颜色的变化把事情搞砸了。 so i can use another pair of eyes for finding the problem thank you [click here to see the issues in detail]所以我可以用另一双眼睛找到问题谢谢[点击这里查看问题的详细信息]
void blur(int height, int width, RGBTRIPLE image[height][width])
{
RGBTRIPLE changed[height][width];
for(int i=0 ; i<=height-1 ;i++)
{
for(int j=0 ; j<=width-1 ; j++)
{
if(i==0) //main if north corners
{
if (j==0)
{
changed[i][j].rgbtRed =round( (image[i][j].rgbtRed + image[i][j+1].rgbtRed + image[i+1][j+1].rgbtRed + image[i+1][j].rgbtRed) /4);
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i][j+1].rgbtGreen + image[i+1][j+1].rgbtGreen + image[i+1][j].rgbtGreen) /4);
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i][j+1].rgbtBlue + image[i+1][j+1].rgbtBlue + image[i+1][j].rgbtBlue) /4);
}
else if(j==width-1)
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i][j-1].rgbtRed + image[i+1][j-1].rgbtRed + image[i+1][j].rgbtRed) /4);
changed[i][j].rgbtGreen = round( (image[i][j].rgbtGreen + image[i][j-1].rgbtGreen + image[i+1][j-1].rgbtGreen + image[i+1][j].rgbtGreen) /4);
changed[i][j].rgbtBlue = round( (image[i][j].rgbtBlue + image[i][j-1].rgbtBlue + image[i+1][j-1].rgbtBlue + image[i+1][j].rgbtBlue) /4);
}
}
else if(i==height-1) //main if south corners
{
if (j==0)
{
changed[i][j].rgbtRed = round( (image[i][j].rgbtRed + image[i-1][j].rgbtRed + image[i-1][j+1].rgbtRed + image[i][j+1].rgbtRed) /4);
changed[i][j].rgbtGreen = round( (image[i][j].rgbtGreen + image[i-1][j].rgbtGreen + image[i-1][j+1].rgbtGreen + image[i][j+1].rgbtGreen) /4);
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i-1][j].rgbtBlue + image[i-1][j+1].rgbtBlue + image[i][j+1].rgbtBlue) /4);
}
else if(j==width-1)
{
changed[i][j].rgbtRed = round ((image[i][j].rgbtRed + image[i-1][j].rgbtRed + image[i-1][j-1].rgbtRed + image[i][j-1].rgbtRed) /4);
changed[i][j].rgbtGreen = round ((image[i][j].rgbtGreen + image[i-1][j].rgbtGreen + image[i-1][j-1].rgbtGreen + image[i][j-1].rgbtGreen) /4);
changed[i][j].rgbtBlue = round ((image[i][j].rgbtBlue + image[i-1][j].rgbtBlue + image[i-1][j-1].rgbtBlue + image[i][j-1].rgbtBlue) /4);
}
}
else if(i>0 && i<height-1 && j==0) //main if left side
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i-1][j].rgbtRed + image[i-1][j+1].rgbtRed + image[i][j+1].rgbtRed + image[i+1][j+1].rgbtRed + image[i+1][j].rgbtRed) /6);
changed[i][j].rgbtGreen = round( (image[i][j].rgbtGreen + image[i-1][j].rgbtGreen + image[i-1][j+1].rgbtGreen + image[i][j+1].rgbtGreen + image[i+1][j+1].rgbtGreen + image[i+1][j].rgbtGreen) /6);
changed[i][j].rgbtBlue = round ((image[i][j].rgbtBlue + image[i-1][j].rgbtBlue + image[i-1][j+1].rgbtBlue + image[i][j+1].rgbtBlue + image[i+1][j+1].rgbtBlue + image[i+1][j].rgbtBlue) /6);
}
else if(i>0 && i<height-1 && j==width-1) //main if right side
{
changed[i][j].rgbtRed = round ((image[i][j].rgbtRed + image[i-1][j].rgbtRed + image[i-1][j-1].rgbtRed + image[i][j-1].rgbtRed + image[i+1][j-1].rgbtRed + image[i+1][j].rgbtRed) /6);
changed[i][j].rgbtGreen = round ((image[i][j].rgbtGreen + image[i-1][j].rgbtGreen + image[i-1][j-1].rgbtGreen + image[i][j-1].rgbtGreen + image[i+1][j-1].rgbtGreen + image[i+1][j].rgbtGreen) /6);
changed[i][j].rgbtBlue = round ((image[i][j].rgbtBlue + image[i-1][j].rgbtBlue + image[i-1][j-1].rgbtBlue + image[i][j-1].rgbtBlue + image[i+1][j-1].rgbtBlue + image[i+1][j].rgbtBlue) /6);
}
else if(i==0 && j>0 && j<width-1) //main if north side
{
changed[i][j].rgbtRed = round ((image[i][j].rgbtRed + image[i][j-1].rgbtRed + image[i+1][j-1].rgbtRed + image[i+1][j].rgbtRed + image[i+1][j+1].rgbtRed + image[i][j+1].rgbtRed) /6);
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i][j-1].rgbtGreen + image[i+1][j-1].rgbtGreen + image[i+1][j].rgbtGreen + image[i+1][j+1].rgbtGreen + image[i][j+1].rgbtGreen) /6);
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i][j-1].rgbtBlue + image[i+1][j-1].rgbtBlue + image[i+1][j].rgbtBlue + image[i+1][j+1].rgbtBlue + image[i][j+1].rgbtBlue) /6);
}
else if(i==height-1 && j>0 && j>width-1) //main if south side
{
changed[i][j].rgbtRed = round( (image[i][j].rgbtRed + image[i][j-1].rgbtRed + image[i-1][j-1].rgbtRed + image[i-1][j].rgbtRed + image[i-1][j+1].rgbtRed + image[i][j+1].rgbtRed) /6);
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i][j-1].rgbtGreen + image[i-1][j-1].rgbtGreen + image[i-1][j].rgbtGreen + image[i-1][j+1].rgbtGreen + image[i][j+1].rgbtGreen) /6);
changed[i][j].rgbtBlue = round( (image[i][j].rgbtBlue + image[i][j-1].rgbtBlue + image[i-1][j-1].rgbtBlue + image[i-1][j].rgbtBlue + image[i-1][j+1].rgbtBlue + image[i][j+1].rgbtBlue) /6);
}
else //other pixels in the middle
{
changed[i][j].rgbtRed = round ((image[i][j].rgbtRed + image[i][j-1].rgbtRed + image[i-1][j-1].rgbtRed + image[i-1][j].rgbtRed + image[i-1][j+1].rgbtRed + image[i][j+1].rgbtRed + image[i+1][j+1].rgbtRed + image[i+1][j].rgbtRed + image[i+1][j-1].rgbtRed) /9);
changed[i][j].rgbtGreen = round ((image[i][j].rgbtGreen + image[i][j-1].rgbtGreen + image[i-1][j-1].rgbtGreen + image[i-1][j].rgbtGreen + image[i-1][j+1].rgbtGreen + image[i][j+1].rgbtGreen + image[i+1][j+1].rgbtGreen + image[i+1][j].rgbtGreen + image[i+1][j-1].rgbtGreen) /9);
changed[i][j].rgbtBlue = round( (image[i][j].rgbtBlue + image[i][j-1].rgbtBlue + image[i-1][j-1].rgbtBlue + image[i-1][j].rgbtBlue + image[i-1][j+1].rgbtBlue + image[i][j+1].rgbtBlue + image[i+1][j+1].rgbtBlue + image[i+1][j].rgbtBlue + image[i+1][j-1].rgbtBlue) /9);
}
}
}
for (int i = 0 ;i<=height-1 ; i++)
{
for (int j = 0 ; j<=width-1 ; j++)
{
image[i][j]=changed[i][j];
}
}
return;
} }
2 个解决方案
解决方案1
0 已采纳 2021-08-08 20:10:17
bluring all the pixels except the first row(north) and the final row (south) in the pic
If you go through the case discriminations with all those if s and else s, you'll find that the code blocks that should handle the north and south edges between the corners are not entered after the preceding if(i==0) and if(i==height-1) ;如果你 go 通过所有if s 和else s 的大小写区分，你会发现在前面的if(i==0)和if(i==height-1)之后没有输入应该处理角落之间的南北边缘的代码块if(i==height-1) ; indeed with that many cases that was easy to miss.确实有那么多很容易错过的案例。 You could move the code blocks or you could make the whole operation more concise, eg:您可以移动代码块，也可以使整个操作更简洁，例如：
for (int i = 0; i < height; ++i)
for (int j = 0; j < width; ++j)
{
int r = 0, g = 0, b = 0, c = 0; // surrounding pixel color sums and count
for (int y = i-1; y <= i+1; ++y) if (0 <= y && y < height)
for (int x = j-1; x <= j+1; ++x) if (0 <= x && x < width)
r += image[y][x].rgbtRed,
g += image[y][x].rgbtGreen,
b += image[y][x].rgbtBlue,
++c;
// now compute the rounded averages
changed[i][j].rgbtRed = (r+c/2)/c;
changed[i][j].rgbtGreen = (g+c/2)/c;
changed[i][j].rgbtBlue = (b+c/2)/c;
}
解决方案2
0 2021-08-09 09:02:30
This is the changed code这是更改后的代码
RGBTRIPLE changed[height][width];
for (int i = 0 ; i <= height - 1 ;i++)
{
for (int j = 0 ; j <= width - 1 ; j++)
{
//main if north side
if (i == 0 && j > 0 && j < width - 1 )
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i][j - 1].rgbtRed + image[i + 1][j - 1].rgbtRed + image[i + 1][j].rgbtRed + image[i + 1][j + 1].rgbtRed + image[i][j + 1].rgbtRed) / (6.0));
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i][j - 1].rgbtGreen + image[i + 1][j - 1].rgbtGreen + image[i + 1][j].rgbtGreen + image[i + 1][j + 1].rgbtGreen + image[i][j + 1].rgbtGreen) / (6.0));
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i][j - 1].rgbtBlue + image[i + 1][j - 1].rgbtBlue + image[i + 1][j].rgbtBlue + image[i + 1][j + 1].rgbtBlue + image[i][j + 1].rgbtBlue) / (6.0));
}
//main if south side
else if (i==height - 1 && j > 0 && j > width - 1)
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i][j - 1].rgbtRed + image[i - 1][j - 1].rgbtRed + image[i - 1][j].rgbtRed + image[i - 1][j + 1].rgbtRed + image[i][j + 1].rgbtRed) / (6.0));
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i][j - 1].rgbtGreen + image[i - 1][j - 1].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j + 1].rgbtGreen + image[i][j + 1].rgbtGreen) / (6.0));
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i][j - 1].rgbtBlue + image[i - 1][j - 1].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j + 1].rgbtBlue + image[i][j + 1].rgbtBlue) / (6.0));
}
//main if left side
else if (i > 0 && i < height - 1 && j == 0)
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i - 1][j].rgbtRed + image[i - 1][j + 1].rgbtRed + image[i][j + 1].rgbtRed + image[i + 1][j + 1].rgbtRed + image[i + 1][j].rgbtRed) / 6.0);
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j + 1].rgbtGreen + image[i][j + 1].rgbtGreen + image[i + 1][j + 1].rgbtGreen + image[i + 1][j].rgbtGreen) / 6.0);
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j + 1].rgbtBlue + image[i][j + 1].rgbtBlue + image[i + 1][j + 1].rgbtBlue + image[i + 1][j].rgbtBlue) / 6.0);
}
//main if right side
else if (i > 0 && i < height - 1 && j == width - 1)
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i - 1][j].rgbtRed + image[i - 1][j - 1].rgbtRed + image[i][j - 1].rgbtRed + image[i + 1][j - 1].rgbtRed + image[i + 1][j].rgbtRed) / 6.0);
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j - 1].rgbtGreen + image[i][j - 1].rgbtGreen + image[i + 1][j - 1].rgbtGreen + image[i + 1][j].rgbtGreen) / 6.0);
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j - 1].rgbtBlue + image[i][j - 1].rgbtBlue + image[i + 1][j - 1].rgbtBlue + image[i + 1][j].rgbtBlue) / 6.0);
}
//main if north corners
if (i == 0)
{
//north left corner
if (j == 0)
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i][j + 1].rgbtRed + image[i + 1][j + 1].rgbtRed + image[i + 1][j].rgbtRed) / 4.0);
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i][j + 1].rgbtGreen + image[i + 1][j + 1].rgbtGreen + image[i + 1][j].rgbtGreen) / 4.0);
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i][j + 1].rgbtBlue + image[i + 1][j + 1].rgbtBlue + image[i + 1][j].rgbtBlue) / 4.0);
}
//north left corner
else if (j == width - 1)
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i][j - 1].rgbtRed + image[i + 1][j - 1].rgbtRed + image[i + 1][j].rgbtRed) / 4.0);
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i][j - 1].rgbtGreen + image[i + 1][j - 1].rgbtGreen + image[i + 1][j].rgbtGreen) / 4.0);
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i][j - 1].rgbtBlue + image[i + 1][j - 1].rgbtBlue + image[i + 1][j].rgbtBlue) / 4.0);
}
}
//main if south corners
else if (i == height - 1)
{
//south right corner
if (j == 0)
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i - 1][j].rgbtRed + image[i - 1][j + 1].rgbtRed + image[i][j + 1].rgbtRed) / 4.0);
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j + 1].rgbtGreen + image[i][j + 1].rgbtGreen) / 4.0);
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j + 1].rgbtBlue + image[i][j + 1].rgbtBlue) / 4.0);
}
//south left corner
else if (j == width - 1)
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i - 1][j].rgbtRed + image[i - 1][j - 1].rgbtRed + image[i][j - 1].rgbtRed) / 4.0);
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j - 1].rgbtGreen + image[i][j - 1].rgbtGreen) / 4.0);
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j - 1].rgbtBlue + image[i][j - 1].rgbtBlue) / 4.0);
}
}
else //other pixels in the middle
{
changed[i][j].rgbtRed = round((image[i][j].rgbtRed + image[i][j - 1].rgbtRed + image[i - 1][j - 1].rgbtRed + image[i - 1][j].rgbtRed + image[i - 1][j + 1].rgbtRed + image[i][j + 1].rgbtRed + image[i + 1][j + 1].rgbtRed + image[i + 1][j].rgbtRed + image[i + 1][j - 1].rgbtRed) / (9.0));
changed[i][j].rgbtGreen = round((image[i][j].rgbtGreen + image[i][j - 1].rgbtGreen + image[i - 1][j - 1].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j + 1].rgbtGreen + image[i][j + 1].rgbtGreen + image[i + 1][j + 1].rgbtGreen + image[i + 1][j].rgbtGreen + image[i + 1][j - 1].rgbtGreen) / (9.0));
changed[i][j].rgbtBlue = round((image[i][j].rgbtBlue + image[i][j - 1].rgbtBlue + image[i - 1][j - 1].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j + 1].rgbtBlue + image[i][j + 1].rgbtBlue + image[i + 1][j + 1].rgbtBlue + image[i + 1][j].rgbtBlue + image[i + 1][j - 1].rgbtBlue) / (9.0));
}
}
}
//putting the changed color value in original image(applying the blue filter)
for (int i = 0 ; i <= height - 1 ; i++)
{
for (int j = 0 ; j <= width - 1 ; j++)
{
image[i][j] = changed[i][j];
}
}
return;
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