常用opencv函数

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countNonZero
boundingRect

reduce               计算投影值
Mat mRegionInv = 255 - mBinSrc(rcBound);
   Mat mHorProj;
   reduce(mRegionInv / 255, mHorProj, 1, CV_REDUCE_SUM, CV_32SC1);
   int nTopInd = 0;
   if ( 0 != mHorProj.at<int>(0, 0) )
   {
       while( nTopInd < mHorProj.rows && mHorProj.at<int>(nTopInd, 0) )
       {
           nTopInd ++;
       }
   }

findContours(matBin.clone(), contours, hierarchy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);

Rect r = boundingRect(contours[i]);

//图像匹配
Mat mTemplGray = cv::imread(pTemplePage->templateDM.szImageName, 0);

Mat matSearchImage = mBin(rcSearchRegion);
   Mat matResult;
   cv::matchTemplate(matSearchImage, mTempl, matResult, CV_TM_SQDIFF_NORMED);

   double dMinValue;
   Point ptMinLoc;
   cv::minMaxLoc(matResult, &dMinValue, NULL, &ptMinLoc, NULL);

    contentOffset.x = ptMinLoc.x + rcSearchRegion.x - datumPoint.x;
    contentOffset.y = ptMinLoc.y + rcSearchRegion.y - datumPoint.y;

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