Click or drag to resize
Accord.NET (logo) ThresholdedDifference Class
Calculate difference between two images and threshold it.
Inheritance Hierarchy
SystemObject
  Accord.Imaging.FiltersBaseFilter
    Accord.Imaging.FiltersBaseFilter2
      Accord.Imaging.FiltersThresholdedDifference

Namespace:  Accord.Imaging.Filters
Assembly:  Accord.Imaging (in Accord.Imaging.dll) Version: 3.4.0
Syntax
public class ThresholdedDifference : BaseFilter2
Request Example View Source

The ThresholdedDifference type exposes the following members.

Constructors
  NameDescription
Public methodThresholdedDifference
Initializes a new instance of the ThresholdedDifference class.
Public methodThresholdedDifference(Int32)
Initializes a new instance of the ThresholdedDifference class.
Top
Properties
  NameDescription
Public propertyFormatTranslations
Format translations dictionary.
(Overrides BaseFilterFormatTranslations.)
Public propertyOverlayImage
Overlay image.
(Inherited from BaseFilter2.)
Public propertyThreshold
Difference threshold.
Public propertyUnmanagedOverlayImage
Unmanaged overlay image.
(Inherited from BaseFilter2.)
Public propertyWhitePixelsCount
Number of pixels which were set to white in destination image during last image processing call.
Top
Methods
  NameDescription
Public methodApply(Bitmap)
Apply filter to an image.
(Inherited from BaseFilter.)
Public methodApply(BitmapData)
Apply filter to an image.
(Inherited from BaseFilter.)
Public methodApply(UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseFilter.)
Public methodApply(UnmanagedImage, UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseFilter.)
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(UnmanagedImage, UnmanagedImage)
Process the filter on the specified image.
(Inherited from BaseFilter2.)
Protected methodProcessFilter(UnmanagedImage, UnmanagedImage, UnmanagedImage)
Process the filter on the specified image.
(Overrides BaseFilter2ProcessFilter(UnmanagedImage, UnmanagedImage, UnmanagedImage).)
Public methodToString
Returns a string that represents the current object.
(Inherited from Object.)
Top
Extension Methods
  NameDescription
Public Extension MethodHasMethod
Checks whether an object implements a method with the given name.
(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.)
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 Matrix.)
Top
Remarks

The filter produces similar result as applying Difference filter and then Threshold filter - thresholded difference between two images. Result of this image processing routine may be useful in motion detection applications or finding areas of significant difference.

The filter accepts 8 and 24/32color images for processing. In the case of color images, the image processing routine differences sum over 3 RGB channels (Manhattan distance), i.e. |diffR| + |diffG| + |diffB|.

Sample usage:

// create filter
ThresholdedDifference filter = new ThresholdedDifference( 60 );
// apply the filter
filter.OverlayImage = backgroundImage;
Bitmap resultImage = filter.Apply( sourceImage );

Source image:

Background image:

Result image:

See Also