|
QuadrilateralTransformation Class |
Performs quadrilateral transformation of an area in a given source image.
Inheritance HierarchySystemObject
Accord.Imaging.FiltersBaseTransformationFilter
Accord.Imaging.FiltersQuadrilateralTransformation
Accord.Imaging.FiltersBaseTransformationFilter
Accord.Imaging.FiltersQuadrilateralTransformation
Namespace: Accord.Imaging.Filters
Assembly: Accord.Imaging (in Accord.Imaging.dll) Version: 3.8.0
SyntaxThe QuadrilateralTransformation type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | QuadrilateralTransformation |
Initializes a new instance of the QuadrilateralTransformation class.
|
| QuadrilateralTransformation(ListIntPoint) |
Initializes a new instance of the QuadrilateralTransformation class.
|
| QuadrilateralTransformation(ListIntPoint, Int32, Int32) |
Initializes a new instance of the QuadrilateralTransformation class.
|
Properties| Name | Description | |
|---|---|---|
 | AutomaticSizeCalculaton |
Automatic calculation of destination image or not.
|
| FormatTranslations |
Format translations dictionary.
(Overrides BaseTransformationFilterFormatTranslations.) |
| NewHeight |
Height of the new transformed image.
|
| NewWidth |
Width of the new transformed image.
|
| SourceQuadrilateral |
Quadrilateral's corners in source image.
|
| UseInterpolation |
Specifies if bilinear interpolation should be used or not.
|
Methods| Name | Description | |
|---|---|---|
| Apply(Bitmap) |
Apply filter to an image.
(Inherited from BaseTransformationFilter.) |
| Apply(BitmapData) |
Apply filter to an image.
(Inherited from BaseTransformationFilter.) |
| Apply(UnmanagedImage) |
Apply filter to an image in unmanaged memory.
(Inherited from BaseTransformationFilter.) |
| Apply(UnmanagedImage, UnmanagedImage) |
Apply filter to an image in unmanaged memory.
(Inherited from BaseTransformationFilter.) |
 | CalculateNewImageSize |
Calculates new image size.
(Overrides BaseTransformationFilterCalculateNewImageSize(UnmanagedImage).) |
| Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
| Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
| GetHashCode | Serves as the default hash function. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| ProcessFilter |
Process the filter on the specified image.
(Overrides BaseTransformationFilterProcessFilter(UnmanagedImage, UnmanagedImage).) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
Fields
Extension Methods| Name | Description | |
|---|---|---|
 | HasMethod |
Checks whether an object implements a method with the given name.
(Defined by ExtensionMethods.) |
| IsEqual |
Compares two objects for equality, performing an elementwise
comparison if the elements are vectors or matrices.
(Defined by Matrix.) |
| To(Type) | Overloaded.
Converts an object into another type, irrespective of whether
the conversion can be done at compile time or not. This can be
used to convert generic types to numeric types during runtime.
(Defined by ExtensionMethods.) |
| ToT | Overloaded.
Converts an object into another type, irrespective of whether
the conversion can be done at compile time or not. This can be
used to convert generic types to numeric types during runtime.
(Defined by ExtensionMethods.) |
RemarksThe 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:
See Also