Patent ID: 8421868
Filing Date: 2013-04-16
Classification: G06K

Abstract:
1. A difference degree evaluation device comprising: a signal acquisition unit which acquires at least two signals which are objects of matching; a memory unit which stores one of the two signals, which are acquired by the signal acquisition unit, as a reference signal, and stores the other of the two signals as an object signal; a sample extraction unit which extracts sample points of the object signal respectively corresponding to sample points in a predetermined block of the reference signal stored in the memory unit; a first arithmetic process unit which calculates a maximum value of absolute difference values between the sample points of the reference signal and the sample points of the object signal, which are extracted by the sample extraction unit, as an evaluation value; a second arithmetic process unit which calculates a sum of the absolute difference values between the sample points of the reference signal and the sample points of the object signal as the evaluation value; an evaluation control unit which evaluates a difference degree by selectively using the first arithmetic process unit and the second arithmetic process unit; and a mode setting unit which sets a specific mode, wherein the evaluation control unit evaluates the difference degree by selecting the first arithmetic process unit in a case in which the specific mode is set by the mode setting unit, and selecting the second arithmetic process unit in a case in which the specific mode is not set by the mode setting unit.