| 摘要 |
PROBLEM TO BE SOLVED: To provide a recording technology which solves the problem that there are many false reports in abnormality determination of a monitoring area and extends a recording time without reducing the amount of information. SOLUTION: A key frame selecting part 52 acquires key frames according to an acquisition interval for key frames from a selection control part 32, and calculates matching between the key frames to calculate correspondence point information. An intermediate frame generating part 58 generates an intermediate frame on the basis of the key frames and the correspondence point information. A difference operating part 60 calculates a difference between the generated intermediate frame and an image that originally exists between the key frames. In a data recording part 62, the calculated difference and the correspondence point information are associated with the key frames used as a base for the calculation to generate a correspondence information file, and the correspondence information file is recorded on a recording medium 64. COPYRIGHT: (C)2004,JPO
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