SimpleQuadrilateralTransformation Class |
Namespace: Accord.Imaging.Filters
The SimpleQuadrilateralTransformation type exposes the following members.
Name | Description | |
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SimpleQuadrilateralTransformation |
Initializes a new instance of the SimpleQuadrilateralTransformation class.
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SimpleQuadrilateralTransformation(ListIntPoint) |
Initializes a new instance of the SimpleQuadrilateralTransformation class.
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SimpleQuadrilateralTransformation(ListIntPoint, Int32, Int32) |
Initializes a new instance of the SimpleQuadrilateralTransformation class.
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Name | Description | |
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AutomaticSizeCalculaton |
Automatic calculation of destination image or not.
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FormatTranslations |
Format translations dictionary.
(Overrides BaseTransformationFilterFormatTranslations.) | |
NewHeight |
Height of the new transformed image.
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NewWidth |
Width of the new transformed image.
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SourceQuadrilateral |
Quadrilateral's corners in source image.
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UseInterpolation |
Specifies if bilinear interpolation should be used or not.
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Name | Description | |
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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.) |
Name | Description | |
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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.) |
The class implements simple algorithm described by Olivier Thill for transforming quadrilateral area from a source image into rectangular image. The idea of the algorithm is based on finding for each line of destination rectangular image a corresponding line connecting "left" and "right" sides of quadrilateral in a source image. Then the line is linearly transformed into the line in destination image.
Note |
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Due to simplicity of the algorithm it does not do any correction for perspective. |
Note |
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To make sure the algorithm works correctly, it is preferred if the "left-top" corner of the quadrilateral (screen coordinates system) is specified first in the list of quadrilateral's corners. At least user need to make sure that the "left" side (side connecting first and the last corner) and the "right" side (side connecting second and third corners) are not horizontal. |
Use QuadrilateralTransformation to avoid the above mentioned limitations, which is a more advanced quadrilateral transformation algorithms (although a bit more computationally expensive).
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 SimpleQuadrilateralTransformation filter = new SimpleQuadrilateralTransformation( corners, 200, 200 ); // apply the filter Bitmap newImage = filter.Apply( image );
Initial image:
Result image: