C# Class AForge.Imaging.Filters.BackwardQuadrilateralTransformation

Performs backward quadrilateral transformation into an area in destination image.

The class implements backward quadrilateral transformation algorithm, which allows to transform any rectangular image into any quadrilateral area in a given destination image. The idea of the algorithm is based on homogeneous transformation and its math is described by Paul Heckbert in his "Projective Mappings for Image Warping" paper.

The image processing routines implements similar math to QuadrilateralTransformation, but performs it in backward direction.

The image processing filter accepts 8 grayscale images and 24/32 bpp color images for processing.

Sample usage:

 // define quadrilateral's corners List<IntPoint> corners = new List<IntPoint>( ); corners.Add( new IntPoint(  99,  99 ) ); corners.Add( new IntPoint( 156,  79 ) ); corners.Add( new IntPoint( 184, 126 ) ); corners.Add( new IntPoint( 122, 150 ) ); // create filter BackwardQuadrilateralTransformation filter = new BackwardQuadrilateralTransformation( sourceImage, corners ); // apply the filter Bitmap newImage = filter.Apply( image );

Source image:

Destination image:

Result image:

Inheritance: BaseInPlaceFilter

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Public Methods

Method	Description
BackwardQuadrilateralTransformation ( ) : System	Initializes a new instance of the BackwardQuadrilateralTransformation class.
BackwardQuadrilateralTransformation ( Bitmap sourceImage ) : System	Initializes a new instance of the BackwardQuadrilateralTransformation class.
BackwardQuadrilateralTransformation ( Bitmap sourceImage, List destinationQuadrilateral ) : System	Initializes a new instance of the BackwardQuadrilateralTransformation class.
BackwardQuadrilateralTransformation ( UnmanagedImage sourceUnmanagedImage ) : System	Initializes a new instance of the BackwardQuadrilateralTransformation class.
BackwardQuadrilateralTransformation ( UnmanagedImage sourceUnmanagedImage, List destinationQuadrilateral ) : System	Initializes a new instance of the BackwardQuadrilateralTransformation class.

Protected Methods

Method	Description
ProcessFilter ( UnmanagedImage image ) : void	Process the filter on the specified image.