I want to make the values of num[] replace all of the a[][] values when one of the numbers equal k. So all the values of num correspond to each place at k. So for example when k reaches 20 if there is a 20 in the 2d array I want to replace all 20's with whatever is in num[19], but whenever I try it that, they all become skewed numbers and I can't find the reason why. Are my for loops set up wrong or what else could be the problem?
我想让num []的值替换所有a [] []值,当其中一个数字等于k时。因此num的所有值对应于k处的每个位置。因此,例如当k达到20时,如果在2d数组中有20,我想用num [19]中的任何内容替换所有20,但每当我尝试它时,它们都变成了偏斜的数字,我找不到原因。我的for循环设置错误还是其他可能是什么问题?
#include<iostream>
int main(){
//other code that uses a file to make 2d array
int width, height, maxval;
fin >> P2 >> width >> height >> maxval;
int **a = new int *[height];
for (int i = 0; i < height; i++)
a[i] = new int[width];
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
fin >> a[i][j];
}
}
}
void eq(int **a, int h, int w) {
int num[255];
double num1[255];
double prob[255], cumul[255]{ 0 };
double x, y, z=0;
for (int k = 1; k <= 255; k++)
{
int temp = 0;
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {//counts the repeated pixel values
if (pix[i][j] == k)
{
temp += 1;
}
}
}
num1[k - 1] = temp;
}
for (int i = 0; i < 255; i++) {
prob[i] = (num1[i] / (height*width));//show the decimal number of how many pixel values are in the image over the total
cout << prob[i] << endl;
}
for (int i = 0; i < 255; i++) {
y = prob[i];
x = y + z;
z = x;// adds all the probabilities to make the sum
cumul[i] =x;
cout << cumul[i] << endl;
}
for (int i = 0; i < 255; i++) {
num[i] =floor(cumul[i]*255);// converts the cumulative number to the new pixel value and sets it in a array
}
for (int k = 1; k <= 255; k++) {//loop that is not coming out right
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
if (a[i][j] == k)
{
a[i][j] =num[k-1];
}
}
}
}
}
Basically I am making a function that deals with histogram equalization to make a pgm image clearer. In the main function I am calling a pgm file and setting all the pixel values into a 2d array. So the num[] is the part where I make the new pixel values, but for some reason whenever I call for example a[0][0] I should be getting something that is not zero or 255 since both of those values mean that none of the pixels had that corresponding intensity, but whenever I call it I get 255 or some other random number.
基本上我正在制作一个处理直方图均衡的函数,以使pgm图像更清晰。在main函数中,我调用pgm文件并将所有像素值设置为2d数组。所以num []是我制作新像素值的部分,但出于某种原因,每当我调用例如[0] [0]时,我应该得到的东西不是零或255,因为这两个值都意味着没有像素具有相应的强度,但每当我调用它时,我得到255或其他随机数。
1 个解决方案
#1
0
If i understand what you want to do, this line :
如果我明白你想做什么,这一行:
a[i][j] =num[i];
should be :
应该 :
a[i][j] =num[k-1];
Because you want:
因为你想:
if( a[i][j] = k = 20){
a[i][j] = num[k-1 = 19]
}
#1
0
If i understand what you want to do, this line :
如果我明白你想做什么,这一行:
a[i][j] =num[i];
should be :
应该 :
a[i][j] =num[k-1];
Because you want:
因为你想:
if( a[i][j] = k = 20){
a[i][j] = num[k-1 = 19]
}