Image Processing Toolbox User's Guide

cpstruct2pairs

Convert CPSTRUCT to valid pairs of control points

Syntax

• [input_points, base_points] = cpstruct2pairs(CPSTRUCT)
  

Description

[input_points, base_points] = cpstruct2pairs(CPSTRUCT) takes a CPSTRUCT (produced by cpselect) and returns the arrays of coordinates of valid control point pairs in input_points and base_points. cpstruct2pairs eliminates unmatched points and predicted points.

Example

Start the Control Point Selection Tool, cpselect, with saved images.

• aerial = imread('westconcordaerial.png');
  cpselect(aerial(:,:,1),'westconcordorthophoto.png')
  

Using cpselect, pick control points in the images. Select Save to Workspace from the File menu to save the points to the workspace. On the Save dialog box, check the Structure with all points check box and clear Input points of valid pairs and Base points of valid pairs. Click OK. Use cpstruct2pairs to extract the input and base points from the CPSTRUCT.

• [input_points,base_points] = cpstruct2pairs(cpstruct);  
  

See Also

cp2tform, cpselect, imtransform

cpselect

dct2

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