# Latest

**URL:** https://discourse.itk.org/latest.md?page=106

[Latest](https://discourse.itk.org/latest.md) · [Categories](https://discourse.itk.org/categories.md) · [Tags](https://discourse.itk.org/tags.md)

**Page:** 107

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## [Are we satisfied with ITK namespaces?](https://discourse.itk.org/t/are-we-satisfied-with-itk-namespaces/609)

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**Author:** [@jhlegarreta](https://discourse.itk.org/u/jhlegarreta)\
**Replies:** 3\
**Last updated:** [January 22, 2018, 6:06pm UTC](https://discourse.itk.org/t/are-we-satisfied-with-itk-namespaces/609 "2018-01-22T18:06:01Z")

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Folks, due to a recent issue reported to the ITK Software Guide project, I’ve investigated the use/appearance of nested namespaces in ITK. I’ve identified the following list of namespaces: Accessor Algorithm Concept D…

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## [defautl pixel value for out of bounds during registration](https://discourse.itk.org/t/defautl-pixel-value-for-out-of-bounds-during-registration/605)

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**Author:** [@asertyuio](https://discourse.itk.org/u/asertyuio)\
**Replies:** 2\
**Last updated:** [January 20, 2018, 4:51pm UTC](https://discourse.itk.org/t/defautl-pixel-value-for-out-of-bounds-during-registration/605 "2018-01-20T16:51:45Z")

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Dear all, I’m wondering if there is a way of forcing a default pixel value in the registration metric for out of bounds pixels. I don’t know if I’m clear. Basically I have images for which I know that out of bound value…

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## [DVMeshNoise remote module fork and redirection](https://discourse.itk.org/t/dvmeshnoise-remote-module-fork-and-redirection/604)

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**Author:** [@jhlegarreta](https://discourse.itk.org/u/jhlegarreta)\
**Replies:** 4\
**Last updated:** [January 20, 2018, 9:19am UTC](https://discourse.itk.org/t/dvmeshnoise-remote-module-fork-and-redirection/604 "2018-01-20T09:19:20Z")

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Folks, I’ve realized that the DVMeshNoise remote module that @DVigneault contributed with has the following GitHub address in ITK’s remote modules: However, that seems to be redirecting to: @DVigneault’s IJ submiss…

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## [Gradient magnitude filter](https://discourse.itk.org/t/gradient-magnitude-filter/603)

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**Author:** [@Fijoy\_Vadakkumpadan](https://discourse.itk.org/u/Fijoy_Vadakkumpadan)\
**Replies:** 2\
**Last updated:** [January 19, 2018, 9:11pm UTC](https://discourse.itk.org/t/gradient-magnitude-filter/603 "2018-01-19T21:11:15Z")

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Hello, Is there any difference between the gradients calculated by GradientMagnitudeImageFilter and GradientImageFilter? I took a quick look at the source expecting the former filter to call the latter + AbsImageFilter…

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## [SimpleITK - Manipulating pixel of the buffer image](https://discourse.itk.org/t/simpleitk-manipulating-pixel-of-the-buffer-image/606)

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**Author:** [@Pratama\_Istiadi](https://discourse.itk.org/u/Pratama_Istiadi)\
**Replies:** 0\
**Last updated:** [January 19, 2018, 3:34pm UTC](https://discourse.itk.org/t/simpleitk-manipulating-pixel-of-the-buffer-image/606 "2018-01-19T15:34:17Z")

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I am currently using C# with SimpleITK libraries for manipulating 3d images. I have been able to read my .mhd meta image and perform thresholding, erotion, dilation, etc. The input image is 3D image (or stacked 2D images…

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## [GitHub status CDash link now available for ITK module repositories](https://discourse.itk.org/t/github-status-cdash-link-now-available-for-itk-module-repositories/598)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 7\
**Last updated:** [January 18, 2018, 7:27am UTC](https://discourse.itk.org/t/github-status-cdash-link-now-available-for-itk-module-repositories/598 "2018-01-18T07:27:07Z")

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When creating an ITK external module on GitHub with the ITKModuleTemplate, configuration for free continuous integration testing services are provided. This includes a CTest script that reports the results of a CircleCI …

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## [Build my first ITK registration example](https://discourse.itk.org/t/build-my-first-itk-registration-example/597)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 1\
**Last updated:** [January 17, 2018, 3:39pm UTC](https://discourse.itk.org/t/build-my-first-itk-registration-example/597 "2018-01-17T15:39:25Z")

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Question (via private message): As I am new to ITK software, I want to know how image registration is done in ITK as I want to do overlapping of 2 images. So please kindly tell me the procedure or steps to do the respec…

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## [ITKv5 N4BiasFieldCorrection regression](https://discourse.itk.org/t/itkv5-n4biasfieldcorrection-regression/579)

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**Author:** [@blowekamp](https://discourse.itk.org/u/blowekamp)\
**Replies:** 5\
**Last updated:** [January 16, 2018, 2:44pm UTC](https://discourse.itk.org/t/itkv5-n4biasfieldcorrection-regression/579 "2018-01-16T14:44:04Z")

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I have noticed on the SimpleITK dashboard compiled against ITKv5, master, the N4BiasFieldCorrectionImageFilter test failing: https://open.cdash.org/testDetails.php?test=616394668&build=5213037 The parameters used are p…

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## [ITK include directories for VS2017](https://discourse.itk.org/t/itk-include-directories-for-vs2017/589)

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**Author:** [@ankita](https://discourse.itk.org/u/ankita)\
**Replies:** 3\
**Last updated:** [January 15, 2018, 6:01pm UTC](https://discourse.itk.org/t/itk-include-directories-for-vs2017/589 "2018-01-15T18:01:08Z")

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## [How to create LabelToRGBFunctor](https://discourse.itk.org/t/how-to-create-labeltorgbfunctor/563)

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**Author:** [@benjaminhon](https://discourse.itk.org/u/benjaminhon)\
**Replies:** 9\
**Last updated:** [January 15, 2018, 2:08am UTC](https://discourse.itk.org/t/how-to-create-labeltorgbfunctor/563 "2018-01-15T02:08:59Z")

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for the C++ implementation of LabelMapToRGBImageFilter It says to use a functor to the colormap, im simpleITK, they convert a colormap into a functor: However, in the python version how to I create a type of itk::Fu…

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## [ITKPolarTransform now available as a Python package and Remote module](https://discourse.itk.org/t/itkpolartransform-now-available-as-a-python-package-and-remote-module/587)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 0\
**Last updated:** [January 12, 2018, 8:36pm UTC](https://discourse.itk.org/t/itkpolartransform-now-available-as-a-python-package-and-remote-module/587 "2018-01-12T20:36:40Z")

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For more information on ITKPolarTransform, see the Insight Journal article: Bican J. Polar Transforms for ITK The Insight Journal. July-December. 2006. Polar Transforms for ITK Polar Transforms for ITK Installati…

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## [Set values for a displacement field](https://discourse.itk.org/t/set-values-for-a-displacement-field/586)

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**Author:** [@Ray](https://discourse.itk.org/u/Ray)\
**Replies:** 1\
**Last updated:** [January 12, 2018, 7:01pm UTC](https://discourse.itk.org/t/set-values-for-a-displacement-field/586 "2018-01-12T19:01:40Z")

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Hello! I want to set values for a displacement field. If the position is on a grid point, i.e. something like \[2,3,4\], I will just use SetPixel(). However, sometimes the position is not on a grid point, like \[0.5, 1.7, …

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## [Difference between two displacement fields](https://discourse.itk.org/t/difference-between-two-displacement-fields/582)

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**Author:** [@Ray](https://discourse.itk.org/u/Ray)\
**Replies:** 1\
**Last updated:** [January 10, 2018, 8:03pm UTC](https://discourse.itk.org/t/difference-between-two-displacement-fields/582 "2018-01-10T20:03:13Z")

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Hello! Given two displacement fields df1 and df2, does ITK provide a way to compute the difference between the two displacement fields? i.e. || df1-df2 || Thanks. -Ray

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## [How to slice diagonally (SITK/Python)](https://discourse.itk.org/t/how-to-slice-diagonally-sitk-python/572)

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**Author:** [@Jsphine](https://discourse.itk.org/u/Jsphine)\
**Replies:** 3\
**Last updated:** [January 5, 2018, 6:15pm UTC](https://discourse.itk.org/t/how-to-slice-diagonally-sitk-python/572 "2018-01-05T18:15:40Z")

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Greetings, I just started using ITK (simpleITK/Python) and I would like to slice CT images according to some diagonal axes. I managed to visualize slices according to the x-, y-, and z- axis separately, but I don’t get…

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## [Factory Registration Managers](https://discourse.itk.org/t/factory-registration-managers/573)

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**Author:** [@tim-evain](https://discourse.itk.org/u/tim-evain)\
**Replies:** 4\
**Last updated:** [January 9, 2018, 3:37pm UTC](https://discourse.itk.org/t/factory-registration-managers/573 "2018-01-09T15:37:42Z")

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Hello everyone, Since I always use CMake to get ITK into my own projects, I get the itk(Transform/Image)IOFactoryRegisterManager.h files that are generated during the process. I’m now on a project without CMake, and I …

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## [Get Label Number of each pixel](https://discourse.itk.org/t/get-label-number-of-each-pixel/575)

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**Author:** [@arwtyxouymz](https://discourse.itk.org/u/arwtyxouymz)\
**Replies:** 3\
**Last updated:** [January 9, 2018, 5:21am UTC](https://discourse.itk.org/t/get-label-number-of-each-pixel/575 "2018-01-09T05:21:06Z")

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Hi, all I’m using itkConnectedComponentImageFilter for labeling image and itkLabelToRGBImageFilter for convert from binary image to rgb image based on labeling. I want to get labels of each pixels, but i don’t know how…

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## [Extracting mesh from itk::AntiAliasBinaryImageFilter?](https://discourse.itk.org/t/extracting-mesh-from-itk-antialiasbinaryimagefilter/574)

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**Author:** [@DVigneault](https://discourse.itk.org/u/DVigneault)\
**Replies:** 4\
**Last updated:** [January 9, 2018, 12:46am UTC](https://discourse.itk.org/t/extracting-mesh-from-itk-antialiasbinaryimagefilter/574 "2018-01-09T00:46:51Z")

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All– I am currently using marching cubes \[1\] to extract a mesh from a binarized volume. However, the surface area of the resulting mesh somewhat overestimates ground truth estimates due to the pixelation artifacts. I …

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## [Some thing slow down itkMaskNeighborhoodOperatorImageFilter](https://discourse.itk.org/t/some-thing-slow-down-itkmaskneighborhoodoperatorimagefilter/537)

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**Author:** [@Rock\_Lin](https://discourse.itk.org/u/Rock_Lin)\
**Replies:** 4\
**Last updated:** [January 8, 2018, 4:13pm UTC](https://discourse.itk.org/t/some-thing-slow-down-itkmaskneighborhoodoperatorimagefilter/537 "2018-01-08T16:13:10Z")

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Hi, ITK developers, I am working for implementing a fast convolution process and I found some thing seems incorrect in the itkMaskNeighborhoodOperatorImageFilter . I made a MaskConvolutionImageFilter using itkMaskNeig…

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## [Lambda parameter in LevenbergMarquardtOptimizer](https://discourse.itk.org/t/lambda-parameter-in-levenbergmarquardtoptimizer/577)

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**Author:** [@Anna](https://discourse.itk.org/u/Anna)\
**Replies:** 0\
**Last updated:** [January 8, 2018, 11:28am UTC](https://discourse.itk.org/t/lambda-parameter-in-levenbergmarquardtoptimizer/577 "2018-01-08T11:28:01Z")

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Hi, I’m quite new in ITK and I’m getting in trouble with the optimizer parameters. I’m registering two point clouds in the 3D space, the transformation model is Bspline while the metric used is the euclidean distance be…

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## [FFTWComplexToComplexFFTImageFilter linker error: undefined reference to GenerateInputRequestedRegion()](https://discourse.itk.org/t/fftwcomplextocomplexfftimagefilter-linker-error-undefined-reference-to-generateinputrequestedregion/567)

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**Author:** [@Pierrick](https://discourse.itk.org/u/Pierrick)\
**Replies:** 4\
**Last updated:** [January 4, 2018, 2:07pm UTC](https://discourse.itk.org/t/fftwcomplextocomplexfftimagefilter-linker-error-undefined-reference-to-generateinputrequestedregion/567 "2018-01-04T14:07:01Z")

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Hi All, I’ve been trying to use the FFTWComplexToComplexFFTImageFilter filter, but get linker errors: CMakeFiles/TestFFTW.dir/TestFFTW.cxx.o:(.rodata.\_ZTVN3itk30ComplexToComplexFFTImageFilterINS\_5ImageISt7complexIfELj3…

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## [Different behavior between Release and Debug for treating uninitialized memory](https://discourse.itk.org/t/different-behavior-between-release-and-debug-for-treating-uninitialized-memory/559)

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**Author:** [@Rock\_Lin](https://discourse.itk.org/u/Rock_Lin)\
**Replies:** 4\
**Last updated:** [January 4, 2018, 3:14am UTC](https://discourse.itk.org/t/different-behavior-between-release-and-debug-for-treating-uninitialized-memory/559 "2018-01-04T03:14:07Z")

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Hi All, I am confused by different behavior between Release and Debug configuration for treating uninitialized memory within itk image. My development environment is shown as follows: OS: Windows 7 64 bit SP1 IDE: Vis…

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## [Names next to nicks](https://discourse.itk.org/t/names-next-to-nicks/557)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 3\
**Last updated:** [January 2, 2018, 9:13pm UTC](https://discourse.itk.org/t/names-next-to-nicks/557 "2018-01-02T21:13:11Z")

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@matt.mccormick @fbudin Can full names be displayed next to username on reply headings, like Slicer does? Is this an oversight or intentional choice?

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## [How to clear pipeline from memory](https://discourse.itk.org/t/how-to-clear-pipeline-from-memory/406)

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**Author:** [@benjaminhon](https://discourse.itk.org/u/benjaminhon)\
**Replies:** 2\
**Last updated:** [January 2, 2018, 2:41pm UTC](https://discourse.itk.org/t/how-to-clear-pipeline-from-memory/406 "2018-01-02T14:41:49Z")

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Hi, I notice that I have a memory build up then eventually crashes my program after calling load about 3 times. Everything I call load it will create new pipelines and eventually ends in a VTK image viewer. there is onl…

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## [Call for nominations to the 2018 Insight Software Consortium board](https://discourse.itk.org/t/call-for-nominations-to-the-2018-insight-software-consortium-board/517)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 4\
**Last updated:** [December 30, 2017, 4:40am UTC](https://discourse.itk.org/t/call-for-nominations-to-the-2018-insight-software-consortium-board/517 "2017-12-30T04:40:28Z")

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The Insight Software Consortium (ISC) is a non-profit, educational consortium dedicated to promoting and maintaining open-source, freely available software for medical image analysis. This includes promoting such softwar…

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## [get gray values that are mapped to color LUT](https://discourse.itk.org/t/get-gray-values-that-are-mapped-to-color-lut/558)

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**Author:** [@swetha.bsharma](https://discourse.itk.org/u/swetha.bsharma)\
**Replies:** 1\
**Last updated:** [December 29, 2017, 2:52pm UTC](https://discourse.itk.org/t/get-gray-values-that-are-mapped-to-color-lut/558 "2017-12-29T14:52:03Z")

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Hi All, I have an MRI dicom which I am reading ,it has values from 0-4096 which is mapped to color lut map.I want to get the gray values which are mapped to lut because I want to do some processing over the gray valu…

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## [Compare two images of any kind](https://discourse.itk.org/t/compare-two-images-of-any-kind/543)

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**Author:** [@mschwier](https://discourse.itk.org/u/mschwier)\
**Replies:** 3\
**Last updated:** [December 28, 2017, 8:46pm UTC](https://discourse.itk.org/t/compare-two-images-of-any-kind/543 "2017-12-28T20:46:39Z")

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Is there an easy way to compare two images for equality that also supports Vector Images? Right now I am using the old itkTestMain.h :confused: which uses the itkTestingComparisonImageFilter and does not support Vector …

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## [ITK units of distance](https://discourse.itk.org/t/itk-units-of-distance/554)

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**Author:** [@zivy](https://discourse.itk.org/u/zivy)\
**Replies:** 1\
**Last updated:** [December 27, 2017, 7:56pm UTC](https://discourse.itk.org/t/itk-units-of-distance/554 "2017-12-27T19:56:47Z")

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Posting on discourse as I am mot sure whether to classify this as a bug or a philosophical issue. In general ITK is agnostic to metric units, though most of us that work with medical images assume the unit of measuremen…

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## [Reading an dicom series without the pallete](https://discourse.itk.org/t/reading-an-dicom-series-without-the-pallete/553)

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**Author:** [@swetha.bsharma](https://discourse.itk.org/u/swetha.bsharma)\
**Replies:** 0\
**Last updated:** [December 26, 2017, 11:02am UTC](https://discourse.itk.org/t/reading-an-dicom-series-without-the-pallete/553 "2017-12-26T11:02:09Z")

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Hi All, I have a dicom series with the following tags with bits allocated -16 ,bits stored-12 , High bit -11,PixelRepresentation-0,Photometricinterpresentation- PALLETE\_COLOR. I want to read it as gray image without a…

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## [Run length matrices](https://discourse.itk.org/t/run-length-matrices/548)

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**Author:** [@Francisco\_Oliveira](https://discourse.itk.org/u/Francisco_Oliveira)\
**Replies:** 3\
**Last updated:** [December 26, 2017, 10:19am UTC](https://discourse.itk.org/t/run-length-matrices/548 "2017-12-26T10:19:19Z")

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Hello, I want to use the itk filter ScalarImageToRunLengthMatrixFilter for texture analysis. But I think there something with the filter that does not make sense for me. The filter only allows to set the same number of …

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## [Gerrit not working properly at the moment](https://discourse.itk.org/t/gerrit-not-working-properly-at-the-moment/550)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 1\
**Last updated:** [December 23, 2017, 8:13pm UTC](https://discourse.itk.org/t/gerrit-not-working-properly-at-the-moment/550 "2017-12-23T20:13:57Z")

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It should be resolved after Christmas, if not before.

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