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#include "dcp_core.h"
void Estimate_A(IplImage *DarkChannel, IplImage *InputImage, struct Max_Pixel_Selector *MaxPixel, double A[])
{
double num = height * width * 0.001;
double num1per = num * 0.01; //num1per is the number of 1 percent of top 0.1 pixels
//k is the index of the color channel
int k = 0;
int patchsize;
int dark_i, dark_j;
uchar Max = 0;
IplImage *mask = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 1);
cvZero(mask);
int e = 0, i, j;
for (i = 1; i <= height; i++)
{
for (j = 1; j <= width; j++)
{
MaxPixel[e].Pixel = *(uchar *)(DarkChannel->imageData + (i - 1) * gwidthstep + (j - 1));
MaxPixel[e].i = i;
MaxPixel[e].j = j;
e++;
}
}
sort(MaxPixel, MaxPixel + e, comp1);
for (i = 0; i < num; i++)
{
dark_i = MaxPixel[i].i;
dark_j = MaxPixel[i].j;
*(uchar *)(mask->imageData + (dark_i - 1) * gwidthstep + (dark_j - 1)) = 255;
//ֻ�е�mask���Ϊ255֮��˵���ÿ���������ֵ���ڰ�ͨ����ǰ0.1%֮�ڵ�
}
if (num1per < 9)
patchsize = 3;
else
patchsize = sqrt(num1per);
for (k = 0; k < 3; k++)
{
int e, x, y;
int tmp = (patchsize - 1) / 2;
int st_row, ed_row;
int st_col, ed_col;
double A_tmp = 0;
double aver = 0; // aver Ϊָ����Сpatch��InputImageֵ��ƽ��ֵ
int flag; //flag������ȡmask�ı��
for (i = 1; i <= num; i++)
{
aver = 0;
dark_i = MaxPixel[i].i;
dark_j = MaxPixel[i].j;
st_row = dark_i - tmp, ed_row = dark_i + tmp;
st_col = dark_j - tmp, ed_col = dark_j + tmp;
if (st_row <= 0)
st_row = 1;
if (ed_row>height)
ed_row = height;
if (st_col <= 0)
st_col = 1;
if (ed_col>width)
ed_col = width;
e = 0;
for (x = st_row; x <= ed_row; x++)
{
for (y = st_col; y <= ed_col; y++)
{
flag = *(uchar *)(mask->imageData + (x - 1) * gwidthstep + (y - 1));
if (flag == 0) //δ�����˵���õ㲻��ǰ0.1%��Ӧ�������ڣ�����
{
continue;
}
else
{
aver += *(uchar *)(InputImage->imageData + (x - 1) * widthstep + (y - 1) *nch + k);
e++;
}
}
}
aver /= e;
if (A_tmp < aver)
{
A_tmp = aver;
}
}
A[k] = A_tmp / 255.0;
}
cvReleaseImage(&mask);
}
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