void operation::addNoise(IplImage pFrame,int n)
{
uchar data = (uchar*)pFrame->imageData;
int row = pFrame->height;
int col = pFrame->width;
for(int k = 0;k < n;k++)
{
int i = rand() % row;
int j = rand() % col;
data[i*pFrame->widthStep+3*j] = 255;
data[i*pFrame->widthStep+3*j+1] = 255;
data[i*pFrame->widthStep+3*j+2] = 255;
}
}
算式是什么意思,为什么是3*j, +1 +2 代表什么