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This is a basic example for the OpenCV.

First we must know the structure of IplImage:

IPL image:

IplImage
  |-- int  nChannels;     // Number of color channels (1,2,3,4)
  |-- int  depth;         // Pixel depth in bits: 
  |                       //   IPL_DEPTH_8U, IPL_DEPTH_8S, 
  |                       //   IPL_DEPTH_16U,IPL_DEPTH_16S, 
  |                       //   IPL_DEPTH_32S,IPL_DEPTH_32F, 
  |                       //   IPL_DEPTH_64F
  |-- int  width;         // image width in pixels
  |-- int  height;        // image height in pixels
  |-- char* imageData;    // pointer to aligned image data
  |                       // Note that color images are stored in BGR order
  |-- int  dataOrder;     // 0 - interleaved color channels, 
  |                       // 1 - separate color channels
  |                       // cvCreateImage can only create interleaved images
  |-- int  origin;        // 0 - top-left origin,
  |                       // 1 - bottom-left origin (Windows bitmaps style)
  |-- int  widthStep;     // size of aligned image row in bytes
  |-- int  imageSize;     // image data size in bytes = height*widthStep
  |-- struct _IplROI *roi;// image ROI. when not NULL specifies image
  |                       // region  to be processed.
  |-- char *imageDataOrigin; // pointer to the unaligned origin of image data
  |                          // (needed for correct image deallocation)
  |
  |-- int  align;         // Alignment of image rows: 4 or 8 byte alignment
  |                       // OpenCV ignores this and uses widthStep instead
  |-- char colorModel[4]; // Color model - ignored by OpenCV
//------------------------------------------------------------------------------

int main(int argc, char* argv[])
...{ 

    IplImage *img=cvLoadImage("c://fruitfs.bmp",1);
    CvScalar s;
    for(int i=0;iheight;i++)...{
        for(int j=0;jwidth;j++)...{
        s=cvGet2D(img,i,j); // get the (i,j) pixel value
        printf("B=%f, G=%f, R=%f ",s.val[0],s.val[1],s.val[2]);
        s.val[0]=111;
        s.val[1]=111;
        s.val[2]=111;
        cvSet2D(img,i,j,s);//set the (i,j) pixel value
        }
    }
    cvNamedWindow("Image",1); 

    cvShowImage("Image",img);
    cvWaitKey(0); //等待按键 

    cvDestroyWindow( "Image" );//销毁窗口
    cvReleaseImage( &img ); //释放图像 

    return 0;
} 

 

 其实还有更好的方法，例如将其封装成类，调用起来更加方便，效率也很高。

本文来源：http://www.gdgbn.com/shoujikaifa/13151/