PerspectiveTransformTool

The PerspectiveTransformTool appends a non-linear transformation to the CogCoordinateSpaceTree of a CogImage8Grey.

1. Columns/Rows: Default values within the transformation matrix

2. decimal places: Number of decimal places displayed in the matrix

3. Coordinate space name: Name of the new perspective image space

4. Set SelectedSpaceName: Specifies whether to set the SelectedSpaceName of the output image to names of the coordinate space.

5. Unwrap the image: Image is rectified in perspective

1. Enabled: Enables the calculation of the transformation matrix via an N-to-N point mapping

2. NumPoints: Number of N to N points

3. Unfixed X/Y: Unfixed points, or starting points, for example in pixel coorinate space.

4. Rax Fixtured X/Y: Fixed points, or target points, for example in world coordinates.

The matrix is a planar transformation, followed by a radial transformation, followed by a linear transformation without a rotation matrix:

With this matrix, a point P is transformed into the point P’ as follows:

Note PDX

Controls the perspective transformation in the untransformed X direction.

0 = no perspective transformation in X

> 0 = Tilting of the plane backwards with increasing X

< 0 = Tilting of the plane backwards with decreasing X

Note PDY

Controls the perspective transformation in the non-transformed Y direction.

0 = no perspective transformation in Y

> 0 = Tilting of the plane backwards with increasing Y

< 0 = Tilting of the plane backwards with decreasing Y)

Hint

• The perspective transformation cannot be used directly by Cognex VisionPro Tools. It is only intended for the “Unwarp” case or further use in subsequent scripts.

• Color images (CogImage24PlanarColor) are not allowed!