Related to image processing in matlab

I have two images,one is reference and other is moved by 2 mm. I have to find the euclidean distance by finding the pixel coordinate(black) of reference and moved image so that i can find euclidean distance. Please suggest me suitable and effective answer.

Answer 1

[Image Analyst]

See reponses by Alex Taylor of the Image Processing team at the Mathworks here: http://www.mathworks.com/matlabcentral/answers/73537#comment_168040

and here: http://www.mathworks.com/matlabcentral/answers/85227#comment_171053