[Insight-users] Hough Circle only work with PNG file?

[Jiangtao Li]

Hi, Luis,

Thank you very much for your reply!

I think I found out the problem, it is because of intensity values. After
checking the source code, I found Hough Filter needs another condition of
the input image, that is, the intensity value of circle should above values
outside the circle.

*my BMP file was back circle with white outside*, that's the point.


Sorry for replying you so late, thank you very much~


Regards!

Jiangtao Li


2010/5/10 Luis Ibanez <luis.ibanez at kitware.com>

> Hi Jiangtao
>
> The outcome of the Hought Filter should be independent
> of the file format used for reading the image in.
>
> Can you please send me the .BMP image that you are
> trying to run through the filter ?
>
> Also, send me the source code of the minimal program
> in which you observe this problem.
>
>
> You may want to compare that code with the content
> of the file:
>
>
> Insight/Testing/Code/BasicFilters/
>        itkHoughTransform2DCirclesImageTest.cxx
>
>
>
> You shouldn't have to convert the file format from BMP
> to PNG in order to process the image with ITK.
>
>
>
>       Regards,
>
>
>             Luis
>
>
>
> ----------------------------------------------------------------------------------
> On Tue, May 4, 2010 at 4:33 AM, Jiangtao Li <nelfylee at gmail.com> wrote:
> > Dear all,
> > I am trying to extract a circle from a small bmp image, the circle is
> very
> > clear and without any noise.
> > When I use Hough Circle of ITK to extract it, the result (radius and
> center)
> > is always wrong. Later,
> > I converted this bmp file to PNG file, and the algorithm works.
> > And also, I've tried other format suck as VTK file and JPG file. I found
> > hough algorithm only works with PNG file. I also changed different Image
> > Reader with different pixel type.
> > In this case, if I want to integrate Hough into my program, what kind of
> > internal image type should I use?
> > Did I miss something such as Spacing info? Please give me some
> suggestions!
> > Thank you very much
> > Best Regards!
> > Jiangtao
> > --
> > From Jiangtao Li @ Seoul National University
> >
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