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Accord.NET (logo) ReplaceChannel Class
Replace RGB channel of color imgae.
Inheritance Hierarchy
SystemObject
  Accord.Imaging.FiltersBaseInPlacePartialFilter
    Accord.Imaging.FiltersReplaceChannel

Namespace:  Accord.Imaging.Filters
Assembly:  Accord.Imaging (in Accord.Imaging.dll) Version: 3.4.0
Syntax
public class ReplaceChannel : BaseInPlacePartialFilter
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The ReplaceChannel type exposes the following members.

Constructors
  NameDescription
Public methodReplaceChannel(Int16)
Initializes a new instance of the ReplaceChannel class.
Public methodReplaceChannel(Int16, UnmanagedImage)
Initializes a new instance of the YCbCrReplaceChannel class.
Public methodReplaceChannel(Int16, Bitmap)
Initializes a new instance of the ReplaceChannel class.
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Properties
  NameDescription
Public propertyChannel
ARGB channel to replace.
Public propertyChannelImage
Grayscale image to use for channel replacement.
Public propertyFormatTranslations
Format translations dictionary.
(Overrides BaseInPlacePartialFilterFormatTranslations.)
Public propertyUnmanagedChannelImage
Unmanaged grayscale image to use for channel replacement.
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Methods
  NameDescription
Public methodApply(Bitmap)
Apply filter to an image.
(Inherited from BaseInPlacePartialFilter.)
Public methodApply(BitmapData)
Apply filter to an image.
(Inherited from BaseInPlacePartialFilter.)
Public methodApply(UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseInPlacePartialFilter.)
Public methodApply(UnmanagedImage, UnmanagedImage)
Apply filter to an image in unmanaged memory.
(Inherited from BaseInPlacePartialFilter.)
Public methodApplyInPlace(Bitmap)
Apply filter to an image.
(Inherited from BaseInPlacePartialFilter.)
Public methodApplyInPlace(BitmapData)
Apply filter to an image.
(Inherited from BaseInPlacePartialFilter.)
Public methodApplyInPlace(UnmanagedImage)
Apply filter to an unmanaged image.
(Inherited from BaseInPlacePartialFilter.)
Public methodApplyInPlace(Bitmap, Rectangle)
Apply filter to an image or its part.
(Inherited from BaseInPlacePartialFilter.)
Public methodApplyInPlace(BitmapData, Rectangle)
Apply filter to an image or its part.
(Inherited from BaseInPlacePartialFilter.)
Public methodApplyInPlace(UnmanagedImage, Rectangle)
Apply filter to an unmanaged image or its part.
(Inherited from BaseInPlacePartialFilter.)
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 BaseInPlacePartialFilterProcessFilter(UnmanagedImage, Rectangle).)
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 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.)
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Remarks

Replaces specified RGB channel of color image with specified grayscale image.

The filter is quite useful in conjunction with ExtractChannel filter (however may be used alone in some cases). Using the ExtractChannel filter it is possible to extract one of RGB channel, perform some image processing with it and then put it back into the original color image.

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

Sample usage:

// extract red channel
ExtractChannel extractFilter = new ExtractChannel( RGB.R );
Bitmap channel = extractFilter.Apply( image );
// threshold channel
Threshold thresholdFilter = new Threshold( 230 );
thresholdFilter.ApplyInPlace( channel );            
// put the channel back
ReplaceChannel replaceFilter = new ReplaceChannel( RGB.R, channel );
replaceFilter.ApplyInPlace( image );

Initial image:

Result image:

See Also