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BackgroundSubtract

Performs background subtraction for a directory of images with various methods. The method choices are:

Constant method removes the image intensities with the given value. Image intensities go from 0 to 1.
Mean method removes the mean of the image (negative intensities are zeroed).
Blur method calculates a low pass filter of the image and removes the filtered part.
Opt method removes the intensities with a another intensity image (found in opt port). ( in - opt )
Open / Close use the morphology operator to modify intensities

If the inputs are color images, each channel is handled separately.

Example:

Source	Output

Version	1.1
Bundle	anima
Categories	Image Processing
Authors	Ville Rantanen (ville.rantanen@helsinki.fi)
Issue tracker	View/Report issues
Requires	Matlab
Source files	component.xml imagesubtract.m execute.m
Usage	Example with default values BackgroundSubtract( in = ImageList, //opt = ImageList, method = "Mean", par = 1, stretch = false )

Inputs

Name	Type	Mandatory	Description
in	ImageList	Mandatory	A directory with image files.
opt	ImageList	Optional	A directory with grayscale image files to be subtracted from the dir images if method is opt.

Outputs

Name	Type	Description
out	ImageList	Subtracted images.

Parameters

Name	Type	Default	Description
method	string	"Mean"	Method for background subtraction. Choose from 'Constant', 'Mean', 'Blur', 'Gaussian', 'Opt', 'Open','Close'.
par	float	1	Parameter for the methods. For Constant, it is the value to be removed. For Mean, it is a correction coeffecient which will be multiplied to the calculated mean. For Blur, it is the integer radius of the low pass filter. A value bigger than the expected object size should be used. For Gaussian, it is the sigma of the filter. A value bigger than the expected object size should be used. For Opt, the parameter is not used. For Open or Close, the par is the radius of the disk shaped structure element.
stretch	boolean	false	Maximize the intensities of the image after subtraction.

Test cases

Test case	Parameters▼	IN in	IN opt	OUT out
case1	properties	in	(missing)	out
	method=Mean, par=1
case2	properties	in	opt	out
	method=Opt

Generated 2019-02-08 07:42:06 by Anduril 2.0.0