What is a good reference? 

Answer:

A good reference must possess the following properties:

* It cannot be too small. It should be roughly the same size as or bigger than the objects that
  you want to measure (e.g., using your ipod as the reference for measuring the size of your
  back yard is a bad idea),

* You must be able to obtain the true 3D length of the reference accurately,

* You must be able to locate the references in the two images accurately, or the references
  should have sharp, easily discernable end points, and

* When multiple choices are possible, use a reference that is physically close to the object
  that you want to measure.

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