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Hi guys, i have already counted black pixel from binary image using countNonZero function. And i was curious to implement it manually. Here is my code to count black pixel on each column :

for(int aa = 0; aa < after_shear.cols;aa++){
    Mat aaTmp = after_shear.col(aa);
    int  jumlah = 0;
    for(int oalah = 0; oalah < aaTmp.rows;oalah++){
      for(int oalah2 = 0; oalah2<aaTmp.cols;oalah2++){
        //cout <<(int)fuckTmp.at<uchar>(oalah,oalah2)<<endl;
        if((int)aaTmp.at<uchar>(oalah,oalah2)==0){
          jumlah++;
        }
      }
    }

    if(jumlah==0||jumlah==1){
      pspArray2.push_back(fuck2);
    }
  }

But, it gives me zero result.

Can anyone help me ? Thanks