[ITK] SimpleITK BinaryContour

[Dženan Zukić]

Hi Erik,

Lambert's explanation still holds. When a slice you are viewing cuts the
surface at an angle close to 90°, you will see a thin line (left and right
edges on your contour image). But when it cuts at an angle closer to 0°,
you will see some thicker lines (top and bottom). When the slice cuts the
surface at exactly 0°, you will see the whole surface.

Example: imaging viewing a slice of a surface representing a cube. If you
look at some of the middle slices, you will see a thin empty square. But
the first and last slice will be a filled square.

Another example, instead of a cube imagine surface of a staircase, and how
slicing it along 2 of the 3 axes will produce "thick" edges.

Regards,
Dženan Zukić, PhD, Senior R&D Engineer, Kitware (Carrboro, N.C.)

On Wed, Aug 2, 2017 at 7:53 AM, E.J. Postema <e.postema at erasmusmc.nl> wrote:

> Hi Lambert,
>
>
>
> Sorry, I forgot to mention that the binary image is the original image and
> the contour is the result of the BinaryContourImageFilter on that image. So
> it is a single slice from the stack.
>
>
>
> Regards,
>
>
>
> Erik
>
>
>
>
>
>
>
> *From:* Lambert Zijp [mailto:ljzijp at gmail.com]
> *Sent:* woensdag 2 augustus 2017 13:44
> *To:* E.J. Postema
> *Cc:* community at itk.org
> *Subject:* Re: [ITK] SimpleITK BinaryContour
>
>
>
> Hi Erik,
>
>
>
> It might well be that nothing is going wrong; especially * binary*
> objects could show such behaviour when creating contours.
>
> The right image could be an end slice of your binary object. The left
> image can be explained by assuming that the object in the previous or the
> next slice is larger towards the bottom and much larger towards the top.
>
>
>
> Greetings, Lambert
>
>
>
> On Wed, Aug 2, 2017 at 11:41 AM, E.J. Postema <e.postema at erasmusmc.nl>
> wrote:
>
> Hi everyone,
>
>
>
> So I am trying to create a contour from a binary 3d image. But the results
> seem a bit weird to me (see the images).
>
> I am expecting a line of 1 (or maybe a few) pixels thick.
>
>
>
> Anyone who knows what is going wrong?
>
> Regards,
>
>
>
> Erik
>
>
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