Preprocess CP2TFORM 1.0

When CP2TFORM is used in piecewise linear image transformation mode, it uses triangulation to calculate the local image transformation. Sometimes a good triangulation of basepoints gives folded triangles when used with the input points. The function CP2TFORM try's to remove the controlpoints causing the folding, but often fails with the error:Eliminated * control point pair(s).Fold-over triangles remain. See CP2TFORM reference page. This function PreProcessCp2tform removes all control points which cause fold-over triangles with cp2tform.example code :xy=[input_points2(:,2) input_points2(:,1)];uv=[base_points2(:,2) base_points2(:,1)];[xy uv]=PreProcessCp2tform(xy,uv);trans_prj = cp2tform(xy,uv,'piecewise linear');J = imtransform(I,trans_prj,'Xdata',[1 100],'YData',[1 100],'XYscale',1);

Requirements:	No special requirements
Platforms:	Matlab
Keyword:	Control,  Dinput Points,  Dpreprocesscp Tformxyuvtrans Prj,  Erroreliminated,  Foldover,  Imtransformitrans Prj Xdata,  Input Points,  Linear,  Pairsfoldover,  Point,  Preprocesscp Tform,  Reference,  Remain,  Removes,  Tformexample,  Tformxyuv Piecewise,  Xyscale,  Ydata
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