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GaussianSharpen Class

Gaussian sharpen filter.
Inheritance Hierarchy
SystemObject
  Accord.Imaging.FiltersBaseUsingCopyPartialFilter
    Accord.Imaging.FiltersConvolution
      Accord.Imaging.FiltersGaussianSharpen

Namespace:  Accord.Imaging.Filters
Assembly:  Accord.Imaging (in Accord.Imaging.dll) Version: 3.6.0
Syntax
public class GaussianSharpen : Convolution
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The GaussianSharpen type exposes the following members.

Constructors
  NameDescription
Public methodGaussianSharpen
Initializes a new instance of the GaussianSharpen class.
Public methodGaussianSharpen(Double)
Initializes a new instance of the GaussianSharpen class.
Public methodGaussianSharpen(Double, Int32)
Initializes a new instance of the GaussianSharpen class.
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Properties
  NameDescription
Public propertyDivisor
Division factor.
(Inherited from Convolution.)
Public propertyDynamicDivisorForEdges
Use dynamic divisor for edges or not.
(Inherited from Convolution.)
Public propertyFormatTranslations
Format translations dictionary.
(Inherited from Convolution.)
Public propertyKernel
Convolution kernel.
(Inherited from Convolution.)
Public propertyProcessAlpha
Specifies if alpha channel must be processed or just copied.
(Inherited from Convolution.)
Public propertySigma
Gaussian sigma value, [0.5, 5.0].
Public propertySize
Kernel size, [3, 5].
Public propertyThreshold
Threshold to add to weighted sum.
(Inherited from Convolution.)
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Methods
  NameDescription
Public methodApply(Bitmap)
Apply filter to an image.
(Inherited from BaseUsingCopyPartialFilter.)
Public methodApply(BitmapData)
Apply filter to an image.
(Inherited from BaseUsingCopyPartialFilter.)
Public methodApply(UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseUsingCopyPartialFilter.)
Public methodApply(UnmanagedImage, UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseUsingCopyPartialFilter.)
Public methodApplyInPlace(Bitmap)
Apply filter to an image.
(Inherited from BaseUsingCopyPartialFilter.)
Public methodApplyInPlace(BitmapData)
Apply filter to an image.
(Inherited from BaseUsingCopyPartialFilter.)
Public methodApplyInPlace(UnmanagedImage)
Apply filter to an unmanaged image.
(Inherited from BaseUsingCopyPartialFilter.)
Public methodApplyInPlace(Bitmap, Rectangle)
Apply filter to an image or its part.
(Inherited from BaseUsingCopyPartialFilter.)
Public methodApplyInPlace(BitmapData, Rectangle)
Apply filter to an image or its part.
(Inherited from BaseUsingCopyPartialFilter.)
Public methodApplyInPlace(UnmanagedImage, Rectangle)
Apply filter to an unmanaged image or its part.
(Inherited from BaseUsingCopyPartialFilter.)
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.
(Inherited from Convolution.)
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 MethodToT
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 filter performs convolution filter using the kernel, which is calculate with the help of Kernel2D(Int32) method and then converted to integer sharpening kernel. First of all the integer kernel is calculated from Kernel2D(Int32) by dividing all elements by the element with the smallest value. Then the integer kernel is converted to sharpen kernel by negating all kernel's elements (multiplying with -1), but the central kernel's element is calculated as 2 * sum - centralElement, where sum is the sum off elements in the integer kernel before negating.

For the list of supported pixel formats, see the documentation to Convolution filter.

Sample usage:

// create filter with kernel size equal to 11
// and Gaussia sigma value equal to 4.0
GaussianSharpen filter = new GaussianSharpen( 4, 11 );
// apply the filter
filter.ApplyInPlace( image );

Initial image:

Result image:

See Also