[ITK] [ITK-users] Location of 4-connected voxels with a specific intensity

[Mirco Serra]

Hi Bradley,
sorry to bother you again. Would the method that you suggested work also for DICOM images with values ranging from -1024 to 0? I got this doubt because reading the description of the GrayScaleDilateImageFilter it reads "Only elements of the structuring element having values > 0 are candidates for affecting the center pixel." So, I suppose that in this case I should use a different dilate filter instead?
Thank you very much!Mirco
From: mirco9091 at hotmail.it
To: blowekamp at mail.nih.gov
Date: Thu, 15 May 2014 17:42:35 +0000
CC: insight-users at itk.org
Subject: Re: [ITK-users] Location of 4-connected voxels with a specific intensity




Great, thank you very much indeed!!
Subject: Re: [ITK-users] Location of 4-connected voxels with a specific intensity
From: blowekamp at mail.nih.gov
Date: Thu, 15 May 2014 13:25:19 -0400
CC: insight-users at itk.org
To: mirco9091 at hotmail.it

Hello,
I am suggesting using a cross structuring element, which has the same topology as the 4-connected neighborhood. The output of gray scale dilation is the maximum value of the pixels contained in the structuring element at a location. There are plenty of textbooks and website which provide a more in depth description of grayscale morphology if you need further information.
SimpleITK's python binding may be a good tool to interactively explore how to combine some of these filters to get your desired results.

Hope that helps,Brad
On May 15, 2014, at 1:15 PM, Mirco Serra <mirco9091 at hotmail.it> wrote:Hello Bradley,thanks again for your help. Just to make sure, you are suggesting I use use the itkGrayScaleDilateImageFilter with a binary ball structuring element of radius 1 followed by a itkThresholdImageFilter. Is that correct? How is the dilation helping find the 4-connected voxels that share the intensity property?

Many many thanks,Mirco
Subject: Re: [ITK-users] Location of 4-connected voxels with a specific intensity
From: blowekamp at mail.nih.gov
Date: Thu, 15 May 2014 11:49:32 -0400
CC: insight-users at itk.org
To: mirco9091 at hotmail.it

Hello,
I think a Grayscale dilate and then a threshold may do what you want, if you use a cross with a radius one. The dilate with take the maximum over this template.
Hope that helps.Brad
On May 15, 2014, at 11:45 AM, Mirco Serra <mirco9091 at hotmail.it> wrote:Hi guys,
I have a 2D gray-scale image and I need to locate all the sets of 4-connected voxels that have an intensity below a certain threshold. Do you know which method may be the best in order to do so?
Many thanks in advance for your help,Mirco_____________________________________
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