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

[Bradley Lowekamp]

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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