反映 pset4 CS50

Question

向所有参与 CS50 的人致敬，

目前，我正在做 pset4 过滤、反映和努力编写我编写的代码。它编译得很好，但输出图片看起来像我附加的那个。我有什么线索可以解决这个问题吗？ （如果可能没有解决方案；提示完全可以:)）

#include "helpers.h"
#include <stdio.h>
#include <math.h>

// Convert image to grayscale
void grayscale(int height, int width, RGBTRIPLE image[height][width])
{
   for (int i = 0; i < (height - 1); i++)
   {
       for (int j = 0; j < (width - 1); j++)
       {
           //get the average
           float average = 0;
           average = (image[i][j].rgbtRed + image[i][j].rgbtGreen + image[i][j].rgbtBlue) / 3;

           //set color channels with the average value
           image[i][j].rgbtRed = round(average);
           image[i][j].rgbtGreen = round(average);
           image[i][j].rgbtBlue = round(average);
       }
   }
   return;
}

// Convert image to sepia
void sepia(int height, int width, RGBTRIPLE image[height][width])
{
   for (int i = 0; i < (height - 1); i++)
   {
       for (int j = 0; j < (width - 1); j++)
       {
           //calculate the new values
           float red = 0;
           float green = 0;
           float blue = 0;


           red = .393 * image[i][j].rgbtRed + .769 * image[i][j].rgbtGreen + .189 * image[i][j].rgbtBlue;
           if (round(red) > 255)
           {
               image[i][j].rgbtRed = 255;
           }
           else if (round(red <= 255))
           {
               image[i][j].rgbtRed = red;
           }

           green = .349 * image[i][j].rgbtRed + .686 * image[i][j].rgbtGreen + .168 * image[i][j].rgbtBlue;
           if (round(green) > 255)
           {
               image[i][j].rgbtGreen = 255;
           }
           else if (round(green) <= 255)
           {
               image[i][j].rgbtGreen = green;
           }

           blue = .272 * image[i][j].rgbtRed + .534 * image[i][j].rgbtGreen + .131 * image[i][j].rgbtBlue;
           if (round(blue) > 255)
           {
               image[i][j].rgbtBlue = 255;
           }
           else if (round(blue) <= 255)
           {
               image[i][j].rgbtBlue = blue;
           }
       }
   }
   return;
}

// Reflect image horizontally
void reflect(int height, int width, RGBTRIPLE image[height][width])
{
   for (int i = 0; i < (height - 1); i++)
   {
       //RGBTRIPLE

       int a[width - 1 /2];
       int b[width - 1 /2];
       int c[width - 1 /2];

       for (int j = 0; j < ((width/2) - 1); j++)
       {
           a[j] = image[i][(width - 1) - j].rgbtRed;
           b[j] = image[i][(width - 1) - j].rgbtGreen;
           c[j] = image[i][(width - 1) - j].rgbtBlue;
       }

       // GERADE / UNGERADE ZAHLEN VERARBEITEN

       for (int n = 0; (n + (width - 1) /2) < (width - 1); n++)
       {
           image[i][((width - 1)/2) - n].rgbtRed = image[i][((width - 1)/2) - n].rgbtRed;
           image[i][((width - 1)/2) - n].rgbtGreen = image[i][((width - 1)/2) - n].rgbtGreen;
           image[i][((width - 1)/2) - n].rgbtBlue = image[i][((width - 1)/2) - n].rgbtBlue;
       }

       for (int m = 0; m < ((width/2) - 1); m++)
       {
           image[i][m].rgbtRed = a[m];
           image[i][m].rgbtRed = b[m];
           image[i][m].rgbtRed = c[m];
       }
   }
   return;
}

// Blur image
void blur(int height, int width, RGBTRIPLE image[height][width])
{
   return;
}

输入：

./filter -r stadium.bmp outfile.bmp 

（stadium.bmp只是我选择的一个文件，你可以选择任何文件作为输入）

输出：编译成功，见附图enter image description here

Answer 1

您的代码太复杂了。您不需要将图像划分为 RGB 值。您需要从左到右交换图像值，反之亦然以实现反射。

为此，您可能需要创建一个与“图像”相同的临时数据结构。

RGBTRIPLE temp[width];

使用temp，您需要存储来自image 的值，并交换它们。以下是您可以使用的设计模式。

//Pseudo code
1. //Loop though the row of an image (start from row = 0). We need to iterate every row.
    2. // Loop through the height of an image to save current row in an image to the temp.
    3. // Swap the values in image by using the temp. 

如果你想过滤下面的这个一维图像。

val1, val2, valn, val3, val4

反射滤镜后会是这个样子。

val4, val3, valn, val2, val1