Why oldDotL are set by DstPoints ?

[Hunt Zhan]

Could you help explain the following contradiction?

According to the paper, w_k is defined with respect to the fiducial point(control point) p_k, and hence oldDotL should represent the fiducial point here:

Text-Image-Augmentation/src/imgwarp_mls_similarity.cpp

Lines 59 to 60 in ab8e37a

 w[k] = 1 / ((i - oldDotL[k].x) * (i - oldDotL[k].x) + 
             (j - oldDotL[k].y) * (j - oldDotL[k].y)); 

But instead oldDotL are set with the deformed positions:

Text-Image-Augmentation/src/imgwarp_mls.cpp

Lines 92 to 98 in ab8e37a

 void ImgWarp_MLS::setDstPoints(const vector<Point_<int> > &qdst) { 
     nPoint = qdst.size(); 
     oldDotL.clear(); 
     oldDotL.reserve(nPoint); 
  
     for (size_t i = 0; i < qdst.size(); i++) oldDotL.push_back(qdst[i]); 
 } 

Text-Image-Augmentation/src/Augment.cpp

Lines 41 to 53 in ab8e37a

 qdst.push_back(Point(rand()%threshold, rand()%threshold)); 
 qdst.push_back(Point(img_input.cols-rand()%threshold, rand()%threshold)); 
 qdst.push_back(Point(img_input.cols-rand()%threshold, img_input.rows-rand()%threshold)); 
 qdst.push_back(Point(rand()%threshold, img_input.rows-rand()%threshold)); 
  
 for (int i = 1; i < segment; i++){ 
     qsrc.push_back(Point(cut*i, 0)); 
     qsrc.push_back(Point(cut*i, img_input.rows)); 
     qdst.push_back(Point(cut*i+rand()%threshold-0.5*threshold, rand()%threshold-0.5*threshold)); 
     qdst.push_back(Point(cut*i+rand()%threshold-0.5*threshold, img_input.rows+rand()%threshold-0.5*threshold)); 
 } 
  
 cv::Mat result = trans1.setAllAndGenerate(img_input, qsrc, qdst, img_input.cols, img_input.rows); 

[Hunt Zhan]

Just realize the mapping is from deformed space to source space.