nipype.interfaces.semtools.filtering.featuredetection module¶
Autogenerated file - DO NOT EDIT If you spot a bug, please report it on the mailing list and/or change the generator.
CannyEdge¶
Bases: SEMLikeCommandLine
Wrapped executable:
CannyEdge
.title: Canny Edge Detection
category: Filtering.FeatureDetection
description: Get the distance from a voxel to the nearest voxel of a given tissue type.
version: 0.1.0.(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was written by Hans J. Johnson.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputVolumea pathlike object or string representing an existing file
Required: input tissue label image. Maps to a command-line argument:
--inputVolume %s
.- lowerThresholda float
Threshold is the lowest allowed value in the output image. Its data type is the same as the data type of the output image. Any values below the Threshold level will be replaced with the OutsideValue parameter value, whose default is zero. . Maps to a command-line argument:
--lowerThreshold %f
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.- upperThresholda float
Threshold is the lowest allowed value in the output image. Its data type is the same as the data type of the output image. Any values below the Threshold level will be replaced with the OutsideValue parameter value, whose default is zero. . Maps to a command-line argument:
--upperThreshold %f
.- variancea float
Variance and Maximum error are used in the Gaussian smoothing of the input image. See itkDiscreteGaussianImageFilter for information on these parameters. Maps to a command-line argument:
--variance %f
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
CannySegmentationLevelSetImageFilter¶
Bases: SEMLikeCommandLine
Wrapped executable:
CannySegmentationLevelSetImageFilter
.title: Canny Level Set Image Filter
category: Filtering.FeatureDetection
description: The CannySegmentationLevelSet is commonly used to refine a manually generated manual mask.
version: 0.3.0
license: CC
contributor: Regina Kim
acknowledgements: This command module was derived from Insight/Examples/Segmentation/CannySegmentationLevelSetImageFilter.cxx (copyright) Insight Software Consortium. See http://wiki.na-mic.org/Wiki/index.php/Slicer3:Execution_Model_Documentation for more detailed descriptions.
- advectionWeighta float
Controls the smoothness of the resulting mask, small number are more smooth, large numbers allow more sharp corners. . Maps to a command-line argument:
--advectionWeight %f
.- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- cannyThresholda float
Canny Threshold Value. Maps to a command-line argument:
--cannyThreshold %f
.- cannyVariancea float
Canny variance. Maps to a command-line argument:
--cannyVariance %f
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- initialModela pathlike object or string representing an existing file
Maps to a command-line argument:
--initialModel %s
.- initialModelIsovaluea float
The identification of the input model iso-surface. (for a binary image with 0s and 1s use 0.5) (for a binary image with 0s and 255’s use 127.5). Maps to a command-line argument:
--initialModelIsovalue %f
.- inputVolumea pathlike object or string representing an existing file
Maps to a command-line argument:
--inputVolume %s
.- maxIterationsan integer
The. Maps to a command-line argument:
--maxIterations %d
.- outputSpeedVolumea boolean or a pathlike object or string representing a file
Maps to a command-line argument:
--outputSpeedVolume %s
.- outputVolumea boolean or a pathlike object or string representing a file
Maps to a command-line argument:
--outputVolume %s
.outputSpeedVolume : a pathlike object or string representing an existing file outputVolume : a pathlike object or string representing an existing file
DilateImage¶
Bases: SEMLikeCommandLine
Wrapped executable:
DilateImage
.title: Dilate Image
category: Filtering.FeatureDetection
description: Uses mathematical morphology to dilate the input images.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Mark Scully and Jeremy Bockholt.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputMaskVolumea pathlike object or string representing an existing file
Required: input brain mask image. Maps to a command-line argument:
--inputMaskVolume %s
.- inputRadiusan integer
Required: input neighborhood radius. Maps to a command-line argument:
--inputRadius %d
.- inputVolumea pathlike object or string representing an existing file
Required: input image. Maps to a command-line argument:
--inputVolume %s
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
DilateMask¶
Bases: SEMLikeCommandLine
Wrapped executable:
DilateMask
.title: Dilate Image
category: Filtering.FeatureDetection
description: Uses mathematical morphology to dilate the input images.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Mark Scully and Jeremy Bockholt.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputBinaryVolumea pathlike object or string representing an existing file
Required: input brain mask image. Maps to a command-line argument:
--inputBinaryVolume %s
.- inputVolumea pathlike object or string representing an existing file
Required: input image. Maps to a command-line argument:
--inputVolume %s
.- lowerThresholda float
Required: lowerThreshold value. Maps to a command-line argument:
--lowerThreshold %f
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.- sizeStructuralElementan integer
Size of structural element. sizeStructuralElement=1 means that 3x3x3 structuring element for 3D. Maps to a command-line argument:
--sizeStructuralElement %d
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
DistanceMaps¶
Bases: SEMLikeCommandLine
Wrapped executable:
DistanceMaps
.title: Mauerer Distance
category: Filtering.FeatureDetection
description: Get the distance from a voxel to the nearest voxel of a given tissue type.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Mark Scully and Jeremy Bockholt.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputLabelVolumea pathlike object or string representing an existing file
Required: input tissue label image. Maps to a command-line argument:
--inputLabelVolume %s
.- inputMaskVolumea pathlike object or string representing an existing file
Required: input brain mask image. Maps to a command-line argument:
--inputMaskVolume %s
.- inputTissueLabelan integer
Required: input integer value of tissue type used to calculate distance. Maps to a command-line argument:
--inputTissueLabel %d
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
DumpBinaryTrainingVectors¶
Bases: SEMLikeCommandLine
Wrapped executable:
DumpBinaryTrainingVectors
.title: Erode Image
category: Filtering.FeatureDetection
description: Uses mathematical morphology to erode the input images.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Mark Scully and Jeremy Bockholt.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputHeaderFilenamea pathlike object or string representing an existing file
Required: input header file name. Maps to a command-line argument:
--inputHeaderFilename %s
.- inputVectorFilenamea pathlike object or string representing an existing file
Required: input vector filename. Maps to a command-line argument:
--inputVectorFilename %s
.
ErodeImage¶
Bases: SEMLikeCommandLine
Wrapped executable:
ErodeImage
.title: Erode Image
category: Filtering.FeatureDetection
description: Uses mathematical morphology to erode the input images.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Mark Scully and Jeremy Bockholt.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputMaskVolumea pathlike object or string representing an existing file
Required: input brain mask image. Maps to a command-line argument:
--inputMaskVolume %s
.- inputRadiusan integer
Required: input neighborhood radius. Maps to a command-line argument:
--inputRadius %d
.- inputVolumea pathlike object or string representing an existing file
Required: input image. Maps to a command-line argument:
--inputVolume %s
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
FlippedDifference¶
Bases: SEMLikeCommandLine
Wrapped executable:
FlippedDifference
.title: Flip Image
category: Filtering.FeatureDetection
description: Difference between an image and the axially flipped version of that image.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Mark Scully and Jeremy Bockholt.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputMaskVolumea pathlike object or string representing an existing file
Required: input brain mask image. Maps to a command-line argument:
--inputMaskVolume %s
.- inputVolumea pathlike object or string representing an existing file
Required: input image. Maps to a command-line argument:
--inputVolume %s
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
GenerateBrainClippedImage¶
Bases: SEMLikeCommandLine
Wrapped executable:
GenerateBrainClippedImage
.title: GenerateBrainClippedImage
category: Filtering.FeatureDetection
description: Automatic FeatureImages using neural networks
version: 1.0
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: Eun Young Kim
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputImga pathlike object or string representing an existing file
Input volume 1, usually t1 image. Maps to a command-line argument:
--inputImg %s
.- inputMska pathlike object or string representing an existing file
Input volume 2, usually t2 image. Maps to a command-line argument:
--inputMsk %s
.- numberOfThreadsan integer
Explicitly specify the maximum number of threads to use. Maps to a command-line argument:
--numberOfThreads %d
.- outputFileNamea boolean or a pathlike object or string representing a file
(required) output file name. Maps to a command-line argument:
--outputFileName %s
.
- outputFileNamea pathlike object or string representing an existing file
(required) output file name.
GenerateSummedGradientImage¶
Bases: SEMLikeCommandLine
Wrapped executable:
GenerateSummedGradientImage
.title: GenerateSummedGradient
category: Filtering.FeatureDetection
description: Automatic FeatureImages using neural networks
version: 1.0
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: Greg Harris, Eun Young Kim
- MaximumGradienta boolean
If set this flag, it will compute maximum gradient between two input volumes instead of sum of it. Maps to a command-line argument:
--MaximumGradient
.- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputVolume1a pathlike object or string representing an existing file
Input volume 1, usually t1 image. Maps to a command-line argument:
--inputVolume1 %s
.- inputVolume2a pathlike object or string representing an existing file
Input volume 2, usually t2 image. Maps to a command-line argument:
--inputVolume2 %s
.- numberOfThreadsan integer
Explicitly specify the maximum number of threads to use. Maps to a command-line argument:
--numberOfThreads %d
.- outputFileNamea boolean or a pathlike object or string representing a file
(required) output file name. Maps to a command-line argument:
--outputFileName %s
.
- outputFileNamea pathlike object or string representing an existing file
(required) output file name.
GenerateTestImage¶
Bases: SEMLikeCommandLine
Wrapped executable:
GenerateTestImage
.title: DownSampleImage
category: Filtering.FeatureDetection
description: Down sample image for testing
version: 1.0
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: Eun Young Kim
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputVolumea pathlike object or string representing an existing file
Input volume 1, usually t1 image. Maps to a command-line argument:
--inputVolume %s
.- lowerBoundOfOutputVolumea float
Maps to a command-line argument:
--lowerBoundOfOutputVolume %f
.- outputVolumea boolean or a pathlike object or string representing a file
(required) output file name. Maps to a command-line argument:
--outputVolume %s
.- outputVolumeSizea float
Output Volume Size. Maps to a command-line argument:
--outputVolumeSize %f
.- upperBoundOfOutputVolumea float
Maps to a command-line argument:
--upperBoundOfOutputVolume %f
.
- outputVolumea pathlike object or string representing an existing file
(required) output file name.
GradientAnisotropicDiffusionImageFilter¶
Bases: SEMLikeCommandLine
Wrapped executable:
GradientAnisotropicDiffusionImageFilter
.title: GradientAnisopropicDiffusionFilter
category: Filtering.FeatureDetection
description: Image Smoothing using Gradient Anisotropic Diffuesion Filer
contributor: This tool was developed by Eun Young Kim by modifying ITK Example
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- conductancea float
Conductance for diffusion process. Maps to a command-line argument:
--conductance %f
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputVolumea pathlike object or string representing an existing file
Required: input image. Maps to a command-line argument:
--inputVolume %s
.- numberOfIterationsan integer
Optional value for number of Iterations. Maps to a command-line argument:
--numberOfIterations %d
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.- timeStepa float
Time step for diffusion process. Maps to a command-line argument:
--timeStep %f
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
HammerAttributeCreator¶
Bases: SEMLikeCommandLine
Wrapped executable:
HammerAttributeCreator
.title: HAMMER Feature Vectors
category: Filtering.FeatureDetection
description: Create the feature vectors used by HAMMER.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This was extracted from the Hammer Registration source code, and wrapped up by Hans J. Johnson.
- Scalean integer
Determine Scale of Ball. Maps to a command-line argument:
--Scale %d
.- Strengtha float
Determine Strength of Edges. Maps to a command-line argument:
--Strength %f
.- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputCSFVolumea pathlike object or string representing an existing file
Required: input CSF posterior image. Maps to a command-line argument:
--inputCSFVolume %s
.- inputGMVolumea pathlike object or string representing an existing file
Required: input grey matter posterior image. Maps to a command-line argument:
--inputGMVolume %s
.- inputWMVolumea pathlike object or string representing an existing file
Required: input white matter posterior image. Maps to a command-line argument:
--inputWMVolume %s
.- outputVolumeBasea string
Required: output image base name to be appended for each feature vector. Maps to a command-line argument:
--outputVolumeBase %s
.
NeighborhoodMean¶
Bases: SEMLikeCommandLine
Wrapped executable:
NeighborhoodMean
.title: Neighborhood Mean
category: Filtering.FeatureDetection
description: Calculates the mean, for the given neighborhood size, at each voxel of the T1, T2, and FLAIR.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Mark Scully and Jeremy Bockholt.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputMaskVolumea pathlike object or string representing an existing file
Required: input brain mask image. Maps to a command-line argument:
--inputMaskVolume %s
.- inputRadiusan integer
Required: input neighborhood radius. Maps to a command-line argument:
--inputRadius %d
.- inputVolumea pathlike object or string representing an existing file
Required: input image. Maps to a command-line argument:
--inputVolume %s
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
NeighborhoodMedian¶
Bases: SEMLikeCommandLine
Wrapped executable:
NeighborhoodMedian
.title: Neighborhood Median
category: Filtering.FeatureDetection
description: Calculates the median, for the given neighborhood size, at each voxel of the input image.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Mark Scully and Jeremy Bockholt.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputMaskVolumea pathlike object or string representing an existing file
Required: input brain mask image. Maps to a command-line argument:
--inputMaskVolume %s
.- inputRadiusan integer
Required: input neighborhood radius. Maps to a command-line argument:
--inputRadius %d
.- inputVolumea pathlike object or string representing an existing file
Required: input image. Maps to a command-line argument:
--inputVolume %s
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
STAPLEAnalysis¶
Bases: SEMLikeCommandLine
Wrapped executable:
STAPLEAnalysis
.title: Dilate Image
category: Filtering.FeatureDetection
description: Uses mathematical morphology to dilate the input images.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Mark Scully and Jeremy Bockholt.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputDimensionan integer
Required: input image Dimension 2 or 3. Maps to a command-line argument:
--inputDimension %d
.- inputLabelVolumea list of items which are a pathlike object or string representing an existing file
Required: input label volume. Maps to a command-line argument:
--inputLabelVolume %s...
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
TextureFromNoiseImageFilter¶
Bases: SEMLikeCommandLine
Wrapped executable:
TextureFromNoiseImageFilter
.title: TextureFromNoiseImageFilter
category: Filtering.FeatureDetection
description: Calculate the local noise in an image.
version: 0.1.0.$Revision: 1 $(alpha)
documentation-url: http:://www.na-mic.org/
license: https://www.nitrc.org/svn/brains/BuildScripts/trunk/License.txt
contributor: This tool was developed by Eunyoung Regina Kim
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputRadiusan integer
Required: input neighborhood radius. Maps to a command-line argument:
--inputRadius %d
.- inputVolumea pathlike object or string representing an existing file
Required: input image. Maps to a command-line argument:
--inputVolume %s
.- outputVolumea boolean or a pathlike object or string representing a file
Required: output image. Maps to a command-line argument:
--outputVolume %s
.
- outputVolumea pathlike object or string representing an existing file
Required: output image.
TextureMeasureFilter¶
Bases: SEMLikeCommandLine
Wrapped executable:
TextureMeasureFilter
.title: Canny Level Set Image Filter
category: Filtering.FeatureDetection
description: The CannySegmentationLevelSet is commonly used to refine a manually generated manual mask.
version: 0.3.0
license: CC
contributor: Regina Kim
acknowledgements: This command module was derived from Insight/Examples/Segmentation/CannySegmentationLevelSetImageFilter.cxx (copyright) Insight Software Consortium. See http://wiki.na-mic.org/Wiki/index.php/Slicer3:Execution_Model_Documentation for more detailed descriptions.
- argsa string
Additional parameters to the command. Maps to a command-line argument:
%s
.- distancean integer
Maps to a command-line argument:
--distance %d
.- environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’
Environment variables. (Nipype default value:
{}
)- inputMaskVolumea pathlike object or string representing an existing file
Maps to a command-line argument:
--inputMaskVolume %s
.- inputVolumea pathlike object or string representing an existing file
Maps to a command-line argument:
--inputVolume %s
.- insideROIValuea float
Maps to a command-line argument:
--insideROIValue %f
.- outputFilenamea boolean or a pathlike object or string representing a file
Maps to a command-line argument:
--outputFilename %s
.outputFilename : a pathlike object or string representing an existing file