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BackwardQuadrilateralTransformation Class |
Performs backward quadrilateral transformation into an area in destination image.
Inheritance HierarchySystemObject
Accord.Imaging.FiltersBaseInPlaceFilter
Accord.Imaging.FiltersBackwardQuadrilateralTransformation
Accord.Imaging.FiltersBaseInPlaceFilter
Accord.Imaging.FiltersBackwardQuadrilateralTransformation
Namespace: Accord.Imaging.Filters
Assembly: Accord.Imaging (in Accord.Imaging.dll) Version: 3.8.0
SyntaxThe BackwardQuadrilateralTransformation type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | BackwardQuadrilateralTransformation |
Initializes a new instance of the BackwardQuadrilateralTransformation class.
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| BackwardQuadrilateralTransformation(Bitmap) |
Initializes a new instance of the BackwardQuadrilateralTransformation class.
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| BackwardQuadrilateralTransformation(UnmanagedImage) |
Initializes a new instance of the BackwardQuadrilateralTransformation class.
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| BackwardQuadrilateralTransformation(Bitmap, ListIntPoint) |
Initializes a new instance of the BackwardQuadrilateralTransformation class.
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| BackwardQuadrilateralTransformation(UnmanagedImage, ListIntPoint) |
Initializes a new instance of the BackwardQuadrilateralTransformation class.
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Properties| Name | Description | |
|---|---|---|
 | DestinationQuadrilateral |
Quadrilateral in destination image to transform into.
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| FormatTranslations |
Format translations dictionary.
(Overrides BaseInPlaceFilterFormatTranslations.) |
| SourceImage |
Source image to be transformed into specified quadrilateral.
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| SourceUnmanagedImage |
Source unmanaged image to be transformed into specified quadrilateral.
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| UseInterpolation |
Specifies if bilinear interpolation should be used or not.
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Methods| Name | Description | |
|---|---|---|
| Apply(Bitmap) |
Apply filter to an image.
(Inherited from BaseInPlaceFilter.) |
| Apply(BitmapData) |
Apply filter to an image.
(Inherited from BaseInPlaceFilter.) |
| Apply(UnmanagedImage) |
Apply filter to an image in unmanaged memory.
(Inherited from BaseInPlaceFilter.) |
| Apply(UnmanagedImage, UnmanagedImage) |
Apply filter to an image in unmanaged memory.
(Inherited from BaseInPlaceFilter.) |
| ApplyInPlace(Bitmap) |
Apply filter to an image.
(Inherited from BaseInPlaceFilter.) |
| ApplyInPlace(BitmapData) |
Apply filter to an image.
(Inherited from BaseInPlaceFilter.) |
| ApplyInPlace(UnmanagedImage) |
Apply filter to an unmanaged image.
(Inherited from BaseInPlaceFilter.) |
| 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 BaseInPlaceFilterProcessFilter(UnmanagedImage).) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
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 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:
See Also