PROBLEM TO BE SOLVED: To extremely easily and quickly execute two-dimensional or three dimensional feature extraction, shape description or shape classification.SOLUTION: A reference shape circumscribing or inscribing an outer shape of a target area of a processing object is obtained by first processing means 31. A connection area of residual areas obtained by removing the reference shape from the outer shape is obtained by second processing means 32. Processing of obtaining by the first processing means 31 the similar reference shape different in size from the reference shape inscribing the outer shape of the connection area obtained by the second processing means 32 as a new target area and processing of obtaining by the second processing means 32 as a new target area the connection area of the residual areas obtained by removing the similar reference shape obtained by the first processing means 31 from the outer shape of the target area are repeatedly performed, and the outer shape of the initial target area of the processing object is expanded with the similar reference shape to perform feature extraction of the outer shape of the initial target area as information on the similar reference shape and each residual area.SELECTED DRAWING: Figure 1
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