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TransformToPolar Class
Transform rectangle image into circle (to polar coordinates).
Inheritance Hierarchy
SystemObject
  Accord.Imaging.FiltersBaseTransformationFilter
    Accord.Imaging.FiltersTransformToPolar

Namespace:  Accord.Imaging.Filters
Assembly:  Accord.Imaging (in Accord.Imaging.dll) Version: 3.8.0
Syntax
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public class TransformToPolar : BaseTransformationFilter
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The TransformToPolar type exposes the following members.

Constructors
  NameDescription
Public methodTransformToPolar
Initializes a new instance of the TransformToPolar class.
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Properties
  NameDescription
Public propertyCirlceDepth
Circularity coefficient of the mapping, [0, 1].
Public propertyFillColor
Fill color to use for unprocessed areas.
Public propertyFormatTranslations
Format translations dictionary.
(Overrides BaseTransformationFilterFormatTranslations.)
Public propertyMapBackwards
Specifies direction of mapping.
Public propertyMapFromTop
Specifies if top of the source image should go to center or edge of the result image.
Public propertyNewSize
Size of destination image.
Public propertyOffsetAngle
Offset angle used to shift mapping, [-360, 360] degrees.
Public propertyUseOriginalImageSize
Use source image size for destination or not.
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Methods
  NameDescription
Public methodApply(Bitmap)
Apply filter to an image.
(Inherited from BaseTransformationFilter.)
Public methodApply(BitmapData)
Apply filter to an image.
(Inherited from BaseTransformationFilter.)
Public methodApply(UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseTransformationFilter.)
Public methodApply(UnmanagedImage, UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseTransformationFilter.)
Protected methodCalculateNewImageSize
Calculates new image size.
(Overrides BaseTransformationFilterCalculateNewImageSize(UnmanagedImage).)
Public methodEquals
Determines whether the specified object is equal to the current object.
(Inherited from Object.)
Protected methodFinalize
Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.
(Inherited from Object.)
Public methodGetHashCode
Serves as the default hash function.
(Inherited from Object.)
Public methodGetType
Gets the Type of the current instance.
(Inherited from Object.)
Protected methodMemberwiseClone
Creates a shallow copy of the current Object.
(Inherited from Object.)
Protected methodProcessFilter
Process the filter on the specified image.
(Overrides BaseTransformationFilterProcessFilter(UnmanagedImage, UnmanagedImage).)
Public methodToString
Returns a string that represents the current object.
(Inherited from Object.)
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Extension Methods
  NameDescription
Public Extension MethodHasMethod
Checks whether an object implements a method with the given name.
(Defined by ExtensionMethods.)
Public Extension MethodIsEqual
Compares two objects for equality, performing an elementwise comparison if the elements are vectors or matrices.
(Defined by Matrix.)
Public Extension MethodTo(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.)
Public Extension MethodToTOverloaded.
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.)
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Remarks

The image processing routine does transformation of the source image into circle (polar transformation). The produced effect is similar to GIMP's "Polar Coordinates" distortion filter (or its equivalent in Photoshop).

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

Sample usage:

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// create filter
TransformToPolar filter = new TransformToPolar( );
filter.OffsetAngle = 0;
filter.CirlceDepth = 1;
filter.UseOriginalImageSize = false;
filter.NewSize = new Size( 200, 200 );
// apply the filter
Bitmap newImage = filter.Apply( image );

Initial image:

Result image:

See Also