Method and apparatus for representing a work area in a three-dim

Details Method and apparatus for representing a work area in a three-dim Method and apparatus for representing a work area in a three-dim

1994-09-09

1996-05-07

Pham, Hoa Q.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

600117, G02B 2326

Patent

active

055151604

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a process for representing a work area in a three-dimensional structure in which the work area is imaged by a viewing device.
The invention further relates to a device for representing a work area in a three-dimensional structure with a viewing device of the work area.
When viewing three-dimensional structures with viewing devices, i.e. for example with endoscopes or microscopes, a plane extending vertically to the optical axis of the viewing device and arranged in the focal plane of the viewing device is sharply imaged by the viewing devices so that a viewer can view a plane of the three-dimensional structure either directly or indirectly by the interposition of a camera and a monitor. In this respect, the three-dimensional structure can be anything desired, for example, it can be the interior of a machine, a biological preparation or a human or animal body. These structures are often exceptionally complicated, so that it is favorable not to decide only at the actual viewing of the structure how the viewing device or an instrument is to be advanced in the structure in order to reach a certain point, but it has proven to be favorable to plan the advance path beforehand.
The object is to develop a process of the generic type such that when viewing a three-dimensional structure, the path of displacement planned in advance for the viewing device or for an instrument becomes immediately visible for the viewer so that he can directly control the advancing movement of the viewing device or an instrument when viewing the structure.


SUMMARY OF THE INVENTION

This object is accomplished in accordance with the invention, in a process of the type described at the beginning, in that the relative positioning of the viewing device is determined relative to the structure, that the coordinates of a path of displacement are predetermined for an instrument or for the viewing device in the structure, are compared with the respective positioning and the path of displacement is represented in its correct position in the image of the work area.
In a first preferred embodiment, the procedure is such that one plane of the structure after the other is imaged each time with the viewing device and that the piercing point or points of the path of displacement in the observed plane is/are represented in the correct position in the image of the respectively observed plane.
By means of an exact measurement of the relative positioning of the viewing device relative to the structure, it can be determined exactly which plane in the structure is imaged in the viewing device, namely a plane lying in the focal plane of the viewing device and extending vertically through the optical axis of the viewing device. Thus, for every desired relative position of the viewing device relative to the structure, another plane is sharply imaged.
After this plane has been determined, the point of intersection of this plane with a predetermined path of displacement in the structure can be calculated and it can thereby be determined exactly in which position of the imaged plane the predetermined path of displacement penetrates this plane. When the optical axis of the viewing device is arranged exactly in the piercing point of the predetermined path of displacement, this piercing point is located in the middle of the observed surface, in a lateral deviation of the path of displacement from the optical axis, at a distance from the central point of the image. It is customary when observing the planes to indicate the position of the optical axis, for example, by a Graticule so that in other words, due to the determination of the position of the observed plane and the comparison of the coordinates of this plane with the coordinates of the predetermined path of displacement, the distance and the direction, which have to be covered by the graticule in order to reach the piercing point of the path of displacement in the observed plane, can be determined.
This piercing point in the observed plane is additionally r

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Patent Abstracts of Japan--Abstract No. JP1223926, vol. 13 No. 546, Jun. 12, 1989.

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