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Difference Class

Difference filter - get the difference between overlay and source images.
Inheritance Hierarchy
SystemObject
  Accord.Imaging.FiltersBaseInPlaceFilter
    Accord.Imaging.FiltersBaseInPlaceFilter2
      Accord.Imaging.FiltersDifference

Namespace:  Accord.Imaging.Filters
Assembly:  Accord.Imaging (in Accord.Imaging.dll) Version: 3.7.0
Syntax
public sealed class Difference : BaseInPlaceFilter2
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The Difference type exposes the following members.

Constructors
  NameDescription
Public methodDifference
Initializes a new instance of the Difference class.
Public methodDifference(Bitmap)
Initializes a new instance of the Difference class.
Public methodDifference(UnmanagedImage)
Initializes a new instance of the Difference class.
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Properties
  NameDescription
Public propertyFormatTranslations
Format translations dictionary.
(Overrides BaseInPlaceFilterFormatTranslations.)
Public propertyOverlayImage
Overlay image.
(Inherited from BaseInPlaceFilter2.)
Public propertyUnmanagedOverlayImage
Unmanaged overlay image.
(Inherited from BaseInPlaceFilter2.)
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Methods
  NameDescription
Public methodApply(Bitmap)
Apply filter to an image.
(Inherited from BaseInPlaceFilter.)
Public methodApply(BitmapData)
Apply filter to an image.
(Inherited from BaseInPlaceFilter.)
Public methodApply(UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseInPlaceFilter.)
Public methodApply(UnmanagedImage, UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseInPlaceFilter.)
Public methodApplyInPlace(Bitmap)
Apply filter to an image.
(Inherited from BaseInPlaceFilter.)
Public methodApplyInPlace(BitmapData)
Apply filter to an image.
(Inherited from BaseInPlaceFilter.)
Public methodApplyInPlace(UnmanagedImage)
Apply filter to an unmanaged image.
(Inherited from BaseInPlaceFilter.)
Public methodEquals
Determines whether the specified object is equal to the current object.
(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.)
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 difference filter takes two images (source and overlay images) of the same size and pixel format and produces an image, where each pixel equals to absolute difference between corresponding pixels from provided images.

The filter accepts 8 and 16 bpp grayscale images and 24, 32, 48 and 64 bpp color images for processing.

Note Note
In the case if images with alpha channel are used (32 or 64 bpp), visualization of the result image may seem a bit unexpected - most probably nothing will be seen (in the case if image is displayed according to its alpha channel). This may be caused by the fact that after differencing the entire alpha channel will be zeroed (zero difference between alpha channels), what means that the resulting image will be 100% transparent.

Sample usage:

// create filter
Difference filter = new Difference( overlayImage );
// apply the filter
Bitmap resultImage = filter.Apply( sourceImage );

Source image:

Overlay image:

Result image:

See Also