绘制直方图

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绘制每列灰度和的归一化直方图

int hist_width = actwidth;    //直方图尺寸  

int hist_height = 255;  

IplImage* hist_image = cvCreateImage(cvSize(hist_width,hist_height),8,3);  

for(i =0;i< actwidth;i++)

{  

      for(j =0;j<actheight;j++)

      {  

             gray=((uchar*)(m_Frame2->imageData + m_Frame2->widthStep*j))[i];

             greySum[i]+=gray;

      }

      if(greySum[i]>maxgreySum)

             maxgreySum=greySum[i];

} 

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

{  

       int nRealHeight = cvRound((greySum[i]  * hist_height/ maxgreySum) );  //要绘制的高度  

       cvRectangle(hist_image,   cvPoint(i,0),   cvPoint(i+1,nRealHeight),  CV_RGB(255,255,255));    

}