Detect contour of solid region

In an article about contour extraction and compression of Andrzej Dziech, there are many methods to export contour of image.

How to get list of points in a line

I would suggest converting the line to a parametric format instead of point-slope. That is, a parametric function for the line returns points along that line for the value of some parameter t. You can represent the line as a reference point, and a vector representing the direction of the line going through that point. That way, you just travel d units forward and backward from point A to get your other points.

Some deformation demons methods

One of the most used recently method for the deformable registration is demons method. In this article, I show some results of using demons method implemented in the Itk 4.0.