[ITK-users] post a message

[leena m]

i'm a beginner in python wen i apply thresholding i'm getting error

import SimpleITK as sitk
img = sitk.ReadImage("Sub1.png")
img=img>20

i'm getting error as

RuntimeError Traceback (most recent call
last)<ipython-input-48-a1d4494dca15> in <module>()
1 #img = sitk.Image(img.GetSize(), sitk.sitkUInt8)----> 2 img=img>20
~/sitkpy/lib/python3.5/site-packages/SimpleITK/SimpleITK.py in
__gt__(self, other)
4424 return Greater( self, other )
4425 try:-> 4426 return Greater( self, float(other) )
4427 except (ValueError, TypeError):
4428 return NotImplemented
~/sitkpy/lib/python3.5/site-packages/SimpleITK/SimpleITK.py in Greater(*args)
34345
34346 """

34347 return _SimpleITK.Greater(*args)

34348 class GridImageSource(ImageFilter_0):
34349 """
RuntimeError: Exception thrown in SimpleITK Greater:
/tmp/SimpleITK/Code/Common/include/sitkMemberFunctionFactory.hxx:209:
sitk::ERROR: Pixel type: vector of 8-bit unsigned integer is not
supported in 2D byN3itk6simple18GreaterImageFilterE

I applied img = sitk.Image(img.GetSize(), sitk.sitkUInt8)

but I'm getting a black image

Is there any option like double(img) or im2bw in python.Will normalize work?
<https://stackoverflow.com/questions/tagged/python>

[Yaniv, Ziv Rafael (NIH/NLM/LHC) [C]]

Hello Leena,

The ITK users mailing list is deprecated. In the future, please post questions to the ITK discourse forum https://discourse.itk.org/

With respect to the runtime error, your png image is likely a color image even if it looks grayscale, it is what we call a vector image (multi-channel) in SimpleITK, and the operation of img>20 does not make sense for such images, hence the exception.

As it is not clear what you want to do “threshold a color image” is not a well-defined operation, please post on the discourse forum and provide additional details so that we can help you.

You can see all of the relevant information with respect to “img”, by printing the image “print(img)” will show you the actual structure of the image you read.

hope this helps
Ziv

From: leena m <***@gmail.com>
Date: Wednesday, June 27, 2018 at 11:38 PM
To: "insight-***@itk.org" <insight-***@itk.org>
Subject: [ITK-users] post a message



i'm a beginner in python wen i apply thresholding i'm getting error

import SimpleITK as sitk

img = sitk.ReadImage("Sub1.png")

img=img>20

i'm getting error as

RuntimeError Traceback (most recent call last)

<ipython-input-48-a1d4494dca15> in <module>()

1 #img = sitk.Image(img.GetSize(), sitk.sitkUInt8)

----> 2 img=img>20



~/sitkpy/lib/python3.5/site-packages/SimpleITK/SimpleITK.py in __gt__(self, other)

4424 return Greater( self, other )

4425 try:

-> 4426 return Greater( self, float(other) )

4427 except (ValueError, TypeError):

4428 return NotImplemented



~/sitkpy/lib/python3.5/site-packages/SimpleITK/SimpleITK.py in Greater(*args)

34345

34346 """

34347 return _SimpleITK.Greater(*args)

34348 class GridImageSource(ImageFilter_0):

34349 """



RuntimeError: Exception thrown in SimpleITK Greater: /tmp/SimpleITK/Code/Common/include/sitkMemberFunctionFactory.hxx:209:

sitk::ERROR: Pixel type: vector of 8-bit unsigned integer is not supported in 2D byN3itk6simple18GreaterImageFilterE

I applied img = sitk.Image(img.GetSize(), sitk.sitkUInt8)

but I'm getting a black image

Is there any option like double(img) or im2bw in python.Will normalize work?