How to extend this boundary line?

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Veronika
Veronika le 11 Mar 2017
Commenté : Veronika le 12 Mar 2017
Dear all,
I have this boundary line
and I would like to extend this blue line (boundary points). Is there any option for my problem?
I attach my code.And original image.
  2 commentaires
Image Analyst
Image Analyst le 11 Mar 2017
I don't know what "extend" means to you. Do you mean like you want to enlarge the region, like as if you used imdilate() or something?
Veronika
Veronika le 12 Mar 2017
Yes, this is actually I want. I want enlarge the region, because as you can see this region (thorax) isn´t accurate, there is small space to enlarge this blue boundary line.

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Image Analyst
Image Analyst le 12 Mar 2017
The threshold value of 180 probably needs to be adjusted for this image.
  1 commentaire
Veronika
Veronika le 12 Mar 2017
But I don´t know how....Do you think, that I can´t change only the boundary blue line or points somehow?

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