Hi, I want to find out how thick/big/fat is the object in the image. For example, there is a tree in the image(photograph), I want to use matlab to calculate how big the tree trunk is. Problem: Find out the perimeter of trunk as shown in the first picture (named "perimeter.PNG". attached here. 1) Can I use 3D calculation with front view and side view images only(Only use 1 camera)? 2) Or find out the length of trunk from front view ( second image, named "length.PNG") and combine with other algorithm? 3) If the methods I suggested above are not possible, any possible solutions? p/s: will use matlab, if matlab can't do these,any suggestion on software? Will very appreciate on your suggestions. Thanks in advance!