PURPOSE: To calculate the size of a real object by detecting the positions of an imaginary object presented in the imaginary real space with a three- dimensional magnetic digitizer. ;CONSTITUTION: Vertexes of an imaginary object 111 are indicated with the magnetic sensor 203 of a three-dimensional digitizer 204 fitted to a finger of an observer, accurate shift quantities can be obtained when the vertexes can be accurately indicated even if the imaginary object 111 has a depth, and the position coordinates of the vertexes are detected by the three-dimensional magnetic digitizer 204. Position coordinate data are fed to a data processing device 210, and the size of the three-dimensional object is calculated when the photographic magnifying power is inputted. When the scale is displayed on a display device 211 together with the image of the imaginary object 111, the size of the three-dimensional object can be easily recognized.;COPYRIGHT: (C)1994,JPO&Japio
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