# Latest

**URL:** https://discourse.itk.org/latest.md?page=109

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

**Page:** 110

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## [Custom ImageIOBase class for loading existing buffer through image file reader](https://discourse.itk.org/t/custom-imageiobase-class-for-loading-existing-buffer-through-image-file-reader/419)

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**Author:** [@dyoll](https://discourse.itk.org/u/dyoll)\
**Replies:** 10\
**Last updated:** [November 15, 2017, 4:55pm UTC](https://discourse.itk.org/t/custom-imageiobase-class-for-loading-existing-buffer-through-image-file-reader/419 "2017-11-15T16:55:10Z")

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Hi I would like to create an ImageIO class, which permits to load images from an image “cache” through the image file reader, and storing it back in the cache via the image file writer. Currently I am stumbling over th…

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## [ProcessObject NumberOfThreads](https://discourse.itk.org/t/processobject-numberofthreads/416)

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**Author:** [@blowekamp](https://discourse.itk.org/u/blowekamp)\
**Replies:** 2\
**Last updated:** [November 15, 2017, 3:38pm UTC](https://discourse.itk.org/t/processobject-numberofthreads/416 "2017-11-15T15:38:07Z")

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@dzenanz I suspect this side effect has to do with the recent threading changes. It appears that I can not longer control the global default number of threads with the current ITK master: Blockquote In \[1\]: import Sim…

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## [Build ITK wrapping python error](https://discourse.itk.org/t/build-itk-wrapping-python-error/411)

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**Author:** [@dianyuGao](https://discourse.itk.org/u/dianyuGao)\
**Replies:** 2\
**Last updated:** [November 15, 2017, 1:36am UTC](https://discourse.itk.org/t/build-itk-wrapping-python-error/411 "2017-11-15T01:36:31Z")

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I download the InsightToolkit-4.11.1.tar.gz from https://itk.org/ITK/resources/software.html Unzip in my computer (ubuntu16.04.1),then make folder install the ITK in the terminal ./configure InsightToolkit-4.11.1 and …

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## [Generate inverse warp images](https://discourse.itk.org/t/generate-inverse-warp-images/401)

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**Author:** [@Ray](https://discourse.itk.org/u/Ray)\
**Replies:** 1\
**Last updated:** [November 8, 2017, 8:55pm UTC](https://discourse.itk.org/t/generate-inverse-warp-images/401 "2017-11-08T20:55:35Z")

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I use rigid registration to get a transformation estimation represented by six numbers (three for rotation, three for translation). And I use the following code to generate the corresponding warp image. I wonder if there…

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## [Change optimizer parameters for multiresolution image registration](https://discourse.itk.org/t/change-optimizer-parameters-for-multiresolution-image-registration/397)

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**Author:** [@zhuangming.shen](https://discourse.itk.org/u/zhuangming.shen)\
**Replies:** 5\
**Last updated:** [November 12, 2017, 2:23pm UTC](https://discourse.itk.org/t/change-optimizer-parameters-for-multiresolution-image-registration/397 "2017-11-12T14:23:08Z")

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Hi all, I saw the example of MultiResImageRegistration1.cxx can change the optimizer parameters (e.g learning rate) for different level of a image pyramid. But when I learnt from it to write python-supported ITK code, t…

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## [Problems with deformation functions](https://discourse.itk.org/t/problems-with-deformation-functions/378)

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**Author:** [@Micholas](https://discourse.itk.org/u/Micholas)\
**Replies:** 11\
**Last updated:** [November 9, 2017, 4:16pm UTC](https://discourse.itk.org/t/problems-with-deformation-functions/378 "2017-11-09T16:16:47Z")

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Hello ! I’m a beginner with ITK… What I really need is to use the Laplacian Deformation for an object. However, I don’t really understand how to do that stuff. Is there any example I can get or any guidelines because I’…

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## [GDCMImageIO](https://discourse.itk.org/t/gdcmimageio/402)

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**Author:** [@coertmetz](https://discourse.itk.org/u/coertmetz)\
**Replies:** 0\
**Last updated:** [November 9, 2017, 2:25pm UTC](https://discourse.itk.org/t/gdcmimageio/402 "2017-11-09T14:25:17Z")

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GDCMImageIO seems to use GDCM’s default for the transfer syntax, which is an implicit one. Is there a way to make it use explicit transfer syntax?

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## [itk FEM Solver](https://discourse.itk.org/t/itk-fem-solver/339)

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**Author:** [@nasil122002](https://discourse.itk.org/u/nasil122002)\
**Replies:** 4\
**Last updated:** [November 9, 2017, 2:10pm UTC](https://discourse.itk.org/t/itk-fem-solver/339 "2017-11-09T14:10:44Z")

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Dear ITK community, I want to deform a 3D model using itk’s FEM module. For this I have implemented the following workflow: Read CT data-set and create 3D iso-surface using vtkMarchingCubes (output is polydata) Extrac…

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## [Need help to fix some -Wunused-template dashboard warnings](https://discourse.itk.org/t/need-help-to-fix-some-wunused-template-dashboard-warnings/357)

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**Author:** [@seanm](https://discourse.itk.org/u/seanm)\
**Replies:** 6\
**Last updated:** [November 8, 2017, 6:11pm UTC](https://discourse.itk.org/t/need-help-to-fix-some-wunused-template-dashboard-warnings/357 "2017-11-08T18:11:43Z")

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Hi all, Any C++ experts out there that could help fix these 2 warnings: ITK/Modules/Core/Common/include/itkMath.h:524:1: warning: unused function template ‘AlmostEqualsScalarComparer’ \[-Wunused-template\] AlmostEqualsS…

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## [How to get PixelType from Image](https://discourse.itk.org/t/how-to-get-pixeltype-from-image/374)

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**Author:** [@benjaminhon](https://discourse.itk.org/u/benjaminhon)\
**Replies:** 5\
**Last updated:** [November 8, 2017, 5:54pm UTC](https://discourse.itk.org/t/how-to-get-pixeltype-from-image/374 "2017-11-08T17:54:57Z")

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Hi is it possible to get the Pixel type from an ITK Image? It seems like Simple ITK has GetPixelDValue. I can’t find any examples of how to do this is ITK though. Thanks, Benjamin

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## [itk imageToVTKImageFilter does not seem to update vtkImageViewer2](https://discourse.itk.org/t/itk-imagetovtkimagefilter-does-not-seem-to-update-vtkimageviewer2/395)

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**Author:** [@benjaminhon](https://discourse.itk.org/u/benjaminhon)\
**Replies:** 5\
**Last updated:** [November 8, 2017, 2:01pm UTC](https://discourse.itk.org/t/itk-imagetovtkimagefilter-does-not-seem-to-update-vtkimageviewer2/395 "2017-11-08T14:01:25Z")

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Hi I have a pipeline as follows: itkReader -\> itkThreshold -\> itkImageToVTKImageFilter -\> vtkImageViewer2 im using SetInput, GetOutput to connect the pipeline. However, when I change the threshold parameters, and call …

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## [Set up different learning rates for to-be-optimized elements](https://discourse.itk.org/t/set-up-different-learning-rates-for-to-be-optimized-elements/396)

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**Author:** [@Ray](https://discourse.itk.org/u/Ray)\
**Replies:** 1\
**Last updated:** [November 6, 2017, 6:23pm UTC](https://discourse.itk.org/t/set-up-different-learning-rates-for-to-be-optimized-elements/396 "2017-11-06T18:23:03Z")

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Hello! I’m using RegularStepGradientDescentOptimizerv4 to optimize a rigid registration. I want to set up a higher learning rate for translation parameters and a lower learning rate for rotation parameters. Is there any…

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## [Workshop on Biomedical Image Registration](https://discourse.itk.org/t/workshop-on-biomedical-image-registration/307)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 2\
**Last updated:** [November 4, 2017, 10:37am UTC](https://discourse.itk.org/t/workshop-on-biomedical-image-registration/307 "2017-11-04T10:37:27Z")

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Dear colleagues, We are pleased to announce the 8th International Workshop on Biomedical Image Registration, WBIR2018, held in Leiden, The Netherlands! The workshop brings together leading researchers in the area of bi…

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## [Using LabelMap in Python](https://discourse.itk.org/t/using-labelmap-in-python/259)

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**Author:** [@fbudin](https://discourse.itk.org/u/fbudin)\
**Replies:** 4\
**Last updated:** [November 3, 2017, 8:38pm UTC](https://discourse.itk.org/t/using-labelmap-in-python/259 "2017-11-03T20:38:24Z")

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The ITK example to show how to use itk.LabelMapOverlayImageFilter is only written in C++. This post show how to find types that are available in Python for a specific ITK filter and in the case of itk.LabelMap, who to i…

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## [New Insight Journal Article: Computing Bone Morphometric Feature Maps from 3-Dimensional Images](https://discourse.itk.org/t/new-insight-journal-article-computing-bone-morphometric-feature-maps-from-3-dimensional-images/388)

<div class="topic-metadata">

**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 0\
**Last updated:** [November 2, 2017, 8:30pm UTC](https://discourse.itk.org/t/new-insight-journal-article-computing-bone-morphometric-feature-maps-from-3-dimensional-images/388 "2017-11-02T20:30:29Z")

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Title: Computing Bone Morphometric Feature Maps from 3-Dimensional Images Authors: Vimort J., McCormick M., Paniagua B. Abstract: This document describes a new remote module implemented for the Insight Toolkit (ITK), i…

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## [Is it possible to Convert PNG series in dicom series using ITK?](https://discourse.itk.org/t/is-it-possible-to-convert-png-series-in-dicom-series-using-itk/389)

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**Author:** [@srbn.ghosh89](https://discourse.itk.org/u/srbn.ghosh89)\
**Replies:** 1\
**Last updated:** [November 3, 2017, 6:05pm UTC](https://discourse.itk.org/t/is-it-possible-to-convert-png-series-in-dicom-series-using-itk/389 "2017-11-03T18:05:08Z")

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Hi, I need to convert my PNG series in dicom series . is that possible?

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## [GradientMagnitudeImageFilter vs SobelEdgeDetectionImageFilter](https://discourse.itk.org/t/gradientmagnitudeimagefilter-vs-sobeledgedetectionimagefilter/382)

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**Author:** [@AlexRothberg](https://discourse.itk.org/u/AlexRothberg)\
**Replies:** 1\
**Last updated:** [November 3, 2017, 10:57am UTC](https://discourse.itk.org/t/gradientmagnitudeimagefilter-vs-sobeledgedetectionimagefilter/382 "2017-11-03T10:57:11Z")

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There are a number of edge related filters list here. I am trying to understand the difference between GradientMagnitudeImageFilter and SobelEdgeDetectionImageFilter. GradientMagnitudeImageFilter can incorporate pixel s…

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## [ITK Python: Image Pixel Types](https://discourse.itk.org/t/itk-python-image-pixel-types/387)

<div class="topic-metadata">

**Author:** [@fbudin](https://discourse.itk.org/u/fbudin)\
**Replies:** 0\
**Last updated:** [November 2, 2017, 6:23pm UTC](https://discourse.itk.org/t/itk-python-image-pixel-types/387 "2017-11-02T18:23:21Z")

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Hello everyone, I wrote a blogpost that explains the different ways of reading, writing, and processing images with ITK Python that you can find here. It shows multiple ways of calling filters and explains which way to …

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## [Perona Malik Noise Estimator using Canny](https://discourse.itk.org/t/perona-malik-noise-estimator-using-canny/384)

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**Author:** [@AlexRothberg](https://discourse.itk.org/u/AlexRothberg)\
**Replies:** 0\
**Last updated:** [November 2, 2017, 2:03pm UTC](https://discourse.itk.org/t/perona-malik-noise-estimator-using-canny/384 "2017-11-02T14:03:04Z")

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In Perona and Malik, they state: a histogram of the absolute values of the gradient throughout the image was computed, and K was set equal to the 90% value of its integral My interpretation of this is to take the 9…

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## [Set up masks for registration metric](https://discourse.itk.org/t/set-up-masks-for-registration-metric/370)

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**Author:** [@Ray](https://discourse.itk.org/u/Ray)\
**Replies:** 1\
**Last updated:** [October 30, 2017, 9:08pm UTC](https://discourse.itk.org/t/set-up-masks-for-registration-metric/370 "2017-10-30T21:08:11Z")

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Is there any example file/code of how to set up masks for registration metric? Thanks!

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## [Transform itk::Image to itk::SpatialObject](https://discourse.itk.org/t/transform-itk-image-to-itk-spatialobject/371)

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**Author:** [@Ray](https://discourse.itk.org/u/Ray)\
**Replies:** 1\
**Last updated:** [October 30, 2017, 8:31pm UTC](https://discourse.itk.org/t/transform-itk-image-to-itk-spatialobject/371 "2017-10-30T20:31:29Z")

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What’s the best way to transform an itk::Image class to an itk::SpatialObject class? Thanks! Edit: The context is I have an itk::Image object which contains the a label map, and I would like to transform this object to…

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## [Resampling Image in ITK.](https://discourse.itk.org/t/resampling-image-in-itk/369)

<div class="topic-metadata">

**Author:** [@srbn.ghosh89](https://discourse.itk.org/u/srbn.ghosh89)\
**Replies:** 1\
**Last updated:** [October 30, 2017, 6:40pm UTC](https://discourse.itk.org/t/resampling-image-in-itk/369 "2017-10-30T18:40:25Z")

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I am trying to do a resampling on my PNG image series. I am using this ITK code… https://itk.org/Wiki/ITK/Examples/ImageProcessing/Upsampling My original Image size is 512 x 546. X-range is -512 to -1 (delta 511 )and Y…

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## [itk::PatchBasedDenoisingImageFilter: settings for 3T TOF-MRI](https://discourse.itk.org/t/itk-patchbaseddenoisingimagefilter-settings-for-3t-tof-mri/367)

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**Author:** [@Vince\_Madai](https://discourse.itk.org/u/Vince_Madai)\
**Replies:** 0\
**Last updated:** [October 30, 2017, 1:34pm UTC](https://discourse.itk.org/t/itk-patchbaseddenoisingimagefilter-settings-for-3t-tof-mri/367 "2017-10-30T13:34:23Z")

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Hi everyone, We would like to use the itk::PatchBasedDenoisingImageFilter for 3T TOF-MRAs. Can anyone suggest some initial settings for this purpose (maybe even just defaults from other types of MRI), so that we have a…

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## [SimpleITK dicom series, read tags](https://discourse.itk.org/t/simpleitk-dicom-series-read-tags/362)

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**Author:** [@jonasteuwen](https://discourse.itk.org/u/jonasteuwen)\
**Replies:** 1\
**Last updated:** [October 28, 2017, 1:11pm UTC](https://discourse.itk.org/t/simpleitk-dicom-series-read-tags/362 "2017-10-28T13:11:12Z")

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Dear ITK users, As we are working on a reader study, we want to change some dicom tags so the reader is unable to discover which of the images they are looking at. Previously I wrote tool for that in ITK, which works we…

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## [New Thread Pool Update](https://discourse.itk.org/t/new-thread-pool-update/359)

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**Author:** [@blowekamp](https://discourse.itk.org/u/blowekamp)\
**Replies:** 15\
**Last updated:** [October 27, 2017, 9:22pm UTC](https://discourse.itk.org/t/new-thread-pool-update/359 "2017-10-27T21:22:59Z")

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The recent merging of the thread pools seems impressively successful on the dashboard. So I am tyring to figure out the impact of this recent ThreadPool topic. I am seeing the following things: New ITK\_USE\_THREAD\_POOL…

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## [No support for 64-bit integral pixel types](https://discourse.itk.org/t/no-support-for-64-bit-integral-pixel-types/353)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 18\
**Last updated:** [October 27, 2017, 5:20pm UTC](https://discourse.itk.org/t/no-support-for-64-bit-integral-pixel-types/353 "2017-10-27T17:20:29Z")

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@Nil reported on the mailing list that ITK fails to read a NIFTII image with 64-bit pixel type. NRRD images with 64-bit pixel types can’t be read either, at least on Windows with VS2015 and probably on any compiler wher…

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## [itk.ApproximateSignedDistanceMapImageFilter error](https://discourse.itk.org/t/itk-approximatesigneddistancemapimagefilter-error/361)

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**Author:** [@mafuentes](https://discourse.itk.org/u/mafuentes)\
**Replies:** 3\
**Last updated:** [October 27, 2017, 4:29pm UTC](https://discourse.itk.org/t/itk-approximatesigneddistancemapimagefilter-error/361 "2017-10-27T16:29:15Z")

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I am using the ITK python wheels and was doing a survey of the DistanceMap filters. While trying the ApproximateSignedDistanceMapImageFilter I got an error. Sample code and error below, can anyone give me a hint as to wh…

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## [Switching to Discourse](https://discourse.itk.org/t/switching-to-discourse/26)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 11\
**Last updated:** [October 26, 2017, 7:04pm UTC](https://discourse.itk.org/t/switching-to-discourse/26 "2017-10-26T19:04:05Z")

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How soon do we switch from mailing list to Discourse? :smiley:

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## [Python supported Image To Image Metric v4](https://discourse.itk.org/t/python-supported-image-to-image-metric-v4/340)

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**Author:** [@zhuangming.shen](https://discourse.itk.org/u/zhuangming.shen)\
**Replies:** 7\
**Last updated:** [October 23, 2017, 4:05pm UTC](https://discourse.itk.org/t/python-supported-image-to-image-metric-v4/340 "2017-10-23T16:05:40Z")

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Hi all, I know itk::MattesMutualInformationImageToImageMetricv4 and itk::MeanSquaresImageToImageMetricv4 have been wrapped to python. How about others (e.g. itk::CorrelationImageToImageMetricv4, itk.DemonsImageToImageMe…

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## [Using ITK with Dask - resolving issues due to Lazy Loading](https://discourse.itk.org/t/using-itk-with-dask-resolving-issues-due-to-lazy-loading/346)

<div class="topic-metadata">

**Author:** [@cdeepakroy](https://discourse.itk.org/u/cdeepakroy)\
**Replies:** 1\
**Last updated:** [October 20, 2017, 9:16pm UTC](https://discourse.itk.org/t/using-itk-with-dask-resolving-issues-due-to-lazy-loading/346 "2017-10-20T21:16:54Z")

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I was trying to use Dask to parallelize the application of a python function that uses ITK on multiple images, and encountered issues if LazyLoading is enabled. Here is a code that replicates the error: import os impor…

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