| 摘要 |
In a device for correcting, with respect to the reference plane of an object having a group of contour lines thereon, the positional deviation and variation in the reduced scale created corresponding to the height of each contour line when the object is photographed through a photographic objective, there is provided means for tracing each of the contour lines photographed on the film and generating a position signal for each of the contour lines. A correction mechanism is rotatably supported at a point (N), and has introduced thereinto the ratio between the distance (H) from the center of the photographic objective to the reference plane of the object and the distance ( DELTA H) from any of the contour lines being traced by the signal generating means to the reference plane. The correction mechanism receives at the input side thereof the position signal from the signal generating means to generate a position signal (P') which satisfies the relation that P' = (1 - ( DELTA H/H)P, where P is the input signal from the signal generating means. The signal generating means and the correction mechanism are associated together so that the correction mechanism satisfies the relation that P=P'=O when the signal generating means traces the principal point of the film. Means is provided for detecting and indicating the position signal (P') from the correction mechanism.
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