A range-finding method includes driving a moving member to move relative to a target to a first position, capturing a picture of the target in the first position to obtain a first picture by a picture capturing module on the moving member, feature-analyzin...

A ranging apparatus transmits an optical input signal to an optical signal input/output unit mounted on a measurement target. The optical signal input/output unit receives the optical signal and transmits an optical output signal applied with an optical ch...