9. The method as recited in claim 7 , wherein if the user does not immediately release the second input, allowing the user to drag the second point to visually show a shape and a size of the annotation rectangle.
7. The method of claim 3 , wherein annotating of the captured portion of the reference document further comprises: displaying the captured portion of the reference document to be annotated; receiving a first input from a user designating a first point in the captured portion of the reference document defining a corner of an annotation rectangle; receiving a second input from the user designating a second point in the captured portion of the reference document defining an opposite corner of the annotation rectangle; and annotating the captured portion of the reference document from the first point to the second point of the annotation rectangle when the second input is released.