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FlatFieldCorrection Class

Flat field correction filter.
Inheritance Hierarchy
SystemObject
  Accord.Imaging.FiltersBaseInPlaceFilter
    Accord.Imaging.FiltersFlatFieldCorrection

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

Constructors
  NameDescription
Public methodFlatFieldCorrection
Initializes a new instance of the FlatFieldCorrection class.
Public methodFlatFieldCorrection(Bitmap)
Initializes a new instance of the FlatFieldCorrection class.
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Properties
  NameDescription
Public propertyBackgoundImage
Background image used for flat field correction.
Public propertyFormatTranslations
Format translations dictionary.
(Overrides BaseInPlaceFilterFormatTranslations.)
Public propertyUnmanagedBackgoundImage
Background image used for flat field correction.
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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.)
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 BaseInPlaceFilterProcessFilter(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 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 goal of flat-field correction is to remove artifacts from 2-D images that are caused by variations in the pixel-to-pixel sensitivity of the detector and/or by distortions in the optical path. The filter requires two images for the input - source image, which represents acquisition of some objects (using microscope, for example), and background image, which is taken without any objects presented. The source image is corrected using the formula: src = bgMean * src / bg, where src - source image's pixel value, bg - background image's pixel value, bgMean - mean value of background image.

Note Note
If background image is not provided, then it will be automatically generated on each filter run from source image. The automatically generated background image is produced running Gaussian Blur on the original image with (sigma value is set to 5, kernel size is set to 21). Before blurring the original image is resized to 1/3 of its original size and then the result of blurring is resized back to the original size.

Note Note
The class processes only grayscale (8 bpp indexed) and color (24 bpp) images.

Sample usage:

// create filter
FlatFieldCorrection filter = new FlatFieldCorrection( bgImage );
// process image
filter.ApplyInPlace( sourceImage );

Source image:

Background image:

Result image:

See Also