Patent ID: 6989742

Claim:
An abnormality detection device that detects an occurrence of an abnormality in an event under observation, said abnormality detection device comprising: an input unit operable to acquire a sequence of an input pattern that is data depending upon the event; a transition analyzing unit operable to analyze a characteristic of a transition in the sequence of the input pattern acquired by said input unit; a comparing unit operable to compare the characteristic of the transition analyzed by said transition analyzing unit with a predetermined reference value, and to judge that an abnormality has occurred in the event when the characteristic and the reference value are not approximate to each other within a predetermined range; and an output unit operable to output an occurrence of the abnormality when said comparing unit judges that the abnormality has occurred; wherein said input unit includes a plurality of small motion detection sensors located in a plurality of places in a house, and said input unit is operable to acquire, as the input pattern, a sensor pattern that is a combination of data indicating whether or not there is a small motion outputted from a plurality of said plurality of small motion detection sensors; and wherein said transition analyzing unit is operable to calculate a Markov chain in the sequence of the input pattern and to analyze a characteristic of the calculated Markov chain as the analysis.