use ITK on the web

[zrxiaojie (xiaojie)]

Hi, I’m new to ITK and interested in medical image processing on the web. I tried using itk-js (insightsoftwareconsortium.github.io) to read a dicom series, then showed them on the web through vtk.js. It worked. However, when I want to do some image segmentation, I can’t find the API like itkConnectedThresholdFilter. Is it because ITK mainly targets desktop software and is there a more suitable solution? Any suggestions will be helpful. Thanks in advance.

[dzenanz (Dženan Zukić)]

All ITK filters should be exposed. More insight here:

ITK.js

Hi @sedghi , Yes, ITK.js provides access to all ITK filters! If the data is in a file itk.js can be used to read the file. If the data is in a vtk.js vtkImageData, it can be converted to an itk.js Image with the vtk.js convertVtkToItkImage. For Otsu thresholding download the Threshold an Imaging Using Otsu example, and build it with ITK.js: curl -O https://itk.org/ITKExamples/src/Filtering/Thresholding/ThresholdAnImageUsingOtsu/ThresholdAnImageUsingOtsu.zip unzip ThresholdAnImageUsingOts…

[zrxiaojie (xiaojie)]

Thank you @dzenanz , the message you provided helps me a lot! But when I tried some example like Hello World step by step, I failed to realize it because I only get a 0kb file named itk-js-build-env in the ./web-build after run npx itk-js build . Is it because I miss something? As a beginner, this confuses me a lot.

[dzenanz (Dženan Zukić)]

@matt.mccormick should be able to help.

[matt.mccormick]

Hi @zrxiaojie

@zrxiaojie

Hello World step by step, I failed to realize it because I only get a 0kb file named itk-js-build-env in the ./web-build after run npx itk-js buil

Are there any errors or messages when running the example?

What operating system are you using?

[zrxiaojie (xiaojie)]

Hi @matt.mccormick , my operating system is Windows 10 home version, and the docker seems to be running normally. After I run npx itk-js build . of the itkjs Hello World example, a folder named web-build is created but there is only one file itk-js-build-env in the result

[zrxiaojie (xiaojie)]

Additionally, I try it on another computer with Ubuntu just now. I got the same result.

[matt.mccormick]

@zrxiaojie thanks for the follow-up!

There was an error in the default image in the most recent version. A patch is being released to correct the version and to also improve error reporting when this occurs. In the meantime,

npx itk-js build  --image insighttoolkit/itk-js:20210520-bafb1b5 .

Can be used to explicitly specify the image.

On Windows, make sure that shared folders are enabled on the drive.

[zrxiaojie (xiaojie)]

Thank you for your reply! Maybe there are some problems with my device or I haven’t mastered the use of the dock yet, I haven’t successfully built it with that version of image. But it’s okay, I think I should first learn the knowledge and principles of itk and itkjs. Then I will try a few more times!

[matt.mccormick]

@zrxiaojie keep up the effort! We are here to help.

itk.js 14.1.1 is now available with the corrected default image.