[ITK-users] How to use a binary mask in a registration process ?

[Bradley Lowekamp]

Hello,

First verify that you are using the correct methods for setting the masks. You wrote "SetMetricMovingImage" where I think you intended "SetMetricMovingMask". Mistakes are easy to make in code and things like this should be double/triple checked.

You likely need to perform a morphological erosion on the masks. With smoothing and derivative computation, values outside the mask can effect the metric near the boarder. You need to estimate how big the radius of the erosion need to be based on your smoothing sigmas, and your scale.

Without sample code I don't think I can help further.

HTH,
Brad


On Sep 14, 2015, at 11:11 AM, neon29 <florian.nicolas at ensta-bretagne.org> wrote:

> Hi everybody!
> 
> I am currently trying to register sonar images using SimpleITK with Python.
> As the two images I want to register are geo-projected, I would like to
> restrict each image to the pixels where I have data (and get rid of the
> "background" which consists in '0').
> 
> I have already computed my two binary masks and I have tried to use it with
> the SetMetricFixedMask() and SetMetricMovingImage() methods but when I look
> at the result, it is the same as when I do not use any mask. Indeed, it
> seems that the registration process tend to overlap my masks.
> 
> I hope someone could help!
> 
> Florian
> 
> 
> 
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