[ITK] Finding non-zero pixels

[Bradley Lowekamp]

Hello,

You can find the answer to you question with in the code:
https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Core/Common/include/itkImageBase.h#L403-L417

The return of false or 0 indicate that the index is out of bounds. The index should still be set, just be sure not to use on to get access to a pixel as it's invalid.

Brad

On Jun 3, 2014, at 8:32 AM, Girish, Gavaskar Ruturaj <gavaskar.ruturaj.girish at philips.com> wrote:

> Hello,
>  
> Thanks Brad, that was just what I needed, because pixels equal to the threshold value are not set to OutsideValue.
> I have one more question (actually three). What does it mean when the method itk::Image::TransformPhysicalPointToIndex(point,pixelIndex) returns a 0? Do the index coordinates still get stored in pixelIndex? Why are they not useful?
>  
> Thanks & Regards,
> Ruturaj
>  
> From: Bradley Lowekamp [mailto:blowekamp at mail.nih.gov] 
> Sent: Tuesday, June 03, 2014 5:43 PM
> To: Girish, Gavaskar Ruturaj
> Cc: community at itk.org
> Subject: Re: [ITK] Finding non-zero pixels
>  
> Hello,
>  
> There quite a large number of ways to do this in ITK. Have you looked at the ThresholdImageFilter[1]?
>  
> Brad
>  
> [1] http://www.itk.org/Doxygen/html/classitk_1_1ThresholdImageFilter.html
>  
> On Jun 3, 2014, at 2:34 AM, Girish, Gavaskar Ruturaj <gavaskar.ruturaj.girish at philips.com> wrote:
> 
> 
> Dear all,
>  
> I have a grayscale image. I want a binary mask which is white where the pixels in the original image are non-zero, and black elsewhere. Which filter(s) can I use for this task?
>  
> Thanks & Regards,
> Ruturaj
>  
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