C# Class Accord.Imaging.Filters.QuadrilateralTransformation

Performs quadrilateral transformation of an area in a given source image.

The class implements quadrilateral transformation algorithm, which allows to transform any quadrilateral from a given source image to a rectangular 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 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 QuadrilateralTransformation filter = new QuadrilateralTransformation( corners, 200, 200 ); // apply the filter Bitmap newImage = filter.Apply( image );

Initial image:

Result image:

Inheritance: BaseTransformationFilter
Show file Open project: accord-net/framework

Protected Properties

Property Type Description
newHeight int
newWidth int

Public Methods

Method Description
QuadrilateralTransformation ( ) : System

Initializes a new instance of the QuadrilateralTransformation class.
QuadrilateralTransformation ( List sourceQuadrilateral ) : System

Initializes a new instance of the QuadrilateralTransformation class.

This constructor sets AutomaticSizeCalculaton to , which means that destination image will have width and height automatically calculated based on SourceQuadrilateral property.
QuadrilateralTransformation ( List sourceQuadrilateral, int newWidth, int newHeight ) : System

Initializes a new instance of the QuadrilateralTransformation class.

This constructor sets AutomaticSizeCalculaton to , which means that destination image will have width and height as specified by user.

Protected Methods

Method Description
CalculateNewImageSize ( UnmanagedImage sourceData ) : Size

Calculates new image size.
ProcessFilter ( UnmanagedImage sourceData, UnmanagedImage destinationData ) : void

Process the filter on the specified image.

Private Methods

Method Description
CalculateDestinationSize ( ) : void

Method Details

CalculateNewImageSize() protected method

Calculates new image size.
Source quadrilateral was not set.
protected CalculateNewImageSize ( UnmanagedImage sourceData ) : Size
sourceData UnmanagedImage Source image data.
return System.Drawing.Size

ProcessFilter() protected method

Process the filter on the specified image.
protected ProcessFilter ( UnmanagedImage sourceData, UnmanagedImage destinationData ) : void
sourceData UnmanagedImage Source image data.
destinationData UnmanagedImage Destination image data.
return void

QuadrilateralTransformation() public method

Initializes a new instance of the QuadrilateralTransformation class.
public QuadrilateralTransformation ( ) : System
return System

QuadrilateralTransformation() public method

Initializes a new instance of the QuadrilateralTransformation class.

This constructor sets AutomaticSizeCalculaton to , which means that destination image will have width and height automatically calculated based on SourceQuadrilateral property.

public QuadrilateralTransformation ( List sourceQuadrilateral ) : System
sourceQuadrilateral List Corners of the source quadrilateral area.
return System

QuadrilateralTransformation() public method

Initializes a new instance of the QuadrilateralTransformation class.

This constructor sets AutomaticSizeCalculaton to , which means that destination image will have width and height as specified by user.

public QuadrilateralTransformation ( List sourceQuadrilateral, int newWidth, int newHeight ) : System
sourceQuadrilateral List Corners of the source quadrilateral area.
newWidth int Width of the new transformed image.
newHeight int Height of the new transformed image.
return System

Property Details

newHeight protected property

New image height.
protected int newHeight
return int

newWidth protected property

New image width.
protected int newWidth
return int