opencv中遍历图片数据的两种方法

方法一：

IplImage *pImg = ...;

int nWidth = pImg->width;

int nHeight = pImg->height;

int nChannels = pImg->nChannels;

int nStep = pImg->widthStep;

for (int i=0; i<nHeight; i++)

for(int j=0; j<nWidth; j++)

for (int k=0; k<nChannels; k++)

{

pImg->imageData[i*nStep + j*nChannels + k] = 255 - pImg->imageData[i*nStep + j*nChannels + k];

}

方法二：

IplImage *image = ...;

int div = 8;

int nl = image->height;

int nc = image->width*image->nChannels;

int step = image->widthStep;

unsigned char *data = (unsigned char *)image->imageData;

for (int i=1; i<nl; i++)

{

for (int j=0; j<nc; j+=image->nChannels)

{

data[j] += div/2;

data[j+1] += div/2;

data[j+2] += div/2;

}

data += step;

}