TIEVisionImage.perspectiveTransform

Declaration

procedure perspectiveTransform(dest: TIEVisionImage; matrix: TIEVisionImage); safecall;

Description

Perform a perspective image (matrix) transformation of vectors.

Example

Also see: Automated Samples

// Load test image
ImageEnView1.IO.LoadFromFile( 'D:\TestImage.jpg' );

  

// Find where a point on the original image is positioned after applying a homography (e.g. as used with warpPerspective)
hmat := IEVisionLib().createMath().findHomography( srcPoints, dstPoints, ievREGULAR );

// Points are stored as a 1 row, 2 channel float image of x,y pairs
ptsIn := IEVisionLib().createImage( 1, 1, ievFLOAT32, 2 );
pIn := ptsIn.getScanline( 0 );
pIn[0] := 200;
pIn[1] := 150;

ptsOut := IEVisionLib().createImage();
ptsIn.perspectiveTransform( ptsOut, hmat );
pOut := ptsOut.getScanline( 0 );
ShowMessage( Format( '200,150 => %.1f,%.1f', [ pOut[0], pOut[1] ]));

// Grid points (green) and a selected point (red) mapped onto the warped image

  

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