Finger's measurements through a image

Hey guys. I have this hand's pic (you can see it bellow) and I'd like to find the "outline" of it (should I use edge detection?). Then, I need to find the higher points, and the lowers too (in this case should I use horizontal derivate to find this?) so I can find the finger's measurements... Can you help me with this?? Do you think that has any other way to find this measurements easier??

Best Regards

Answer 1

[Walter Roberson]

rgb2gray, threshold to remove the white area. bwtraceboundaries or else regionprops. You might also want to skeletonize.

[ThuXin Hlaine]

pls explain more