JPH01161107A - Three-dimensional image analyzing device - Google Patents

Abstract

PURPOSE:To measure a three-dimensional image with high accuracy and to enable size measurement by irradiating a three-dimensional body with laser light stepwise. CONSTITUTION:Laser light from a rotating laser light source 17 is reflected by a concave surface mirror 15 to become a linear light beam, which illuminates the three-dimensional body mounted on a table 19. Then the relative positions between laser light irradiating devices 2-6 and the three-dimensional body are varied stepwise and the laser light is projected to photograph a size contour image curved by the three-dimensional body by a camera 21. Then the relative position between the laser light source 17 and three-dimensional body is moved along X, Y and Z axes and the image is photographed with size contours in the respective directions. Consequently, the three-dimensional image is measured with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for efficiently measuring an object having a curved surface in a non-contact manner.
The present invention relates to a three-dimensional image analysis device that measures and analyzes dimensions by exposing a trajectory obtained by irradiating a linear laser beam onto an object from a three-dimensional direction onto a film or the like.

[Conventional technology]

2. Description of the Related Art Techniques such as stereo photography are conventionally known for measuring the dimensions of a three-dimensional object for the purpose of drawing, etc. This method measures the dimensions of a three-dimensional object by analyzing images taken from different angles, and it is generally difficult to improve measurement accuracy, and precise analysis requires advanced and complicated image analysis processing and processing. Computer processing is required.

[Problem that the invention seeks to solve]

This conventional method has problems in that it is difficult to improve measurement accuracy, analysis takes time, and accurate analysis requires sophisticated and complicated image analysis processing and computer processing.

The present invention was created in view of these points, and an object of the present invention is to provide a three-dimensional image analysis device that has a simple configuration and is capable of measuring and measuring with extremely high accuracy.

[Means for solving problems]

The three-dimensional image analysis device of the present invention includes a table on which a three-dimensional object is placed, and a table that moves along the X, Y, and Z axes of the three-dimensional object and emits linear (including dotted) light. a camera (including a video camera) for recording reflected light formed by the laser beam irradiation;
By irradiating the three-dimensional object with the laser light in a stepwise manner, the isometric line of the three-dimensional object is recorded on the camera. The laser light irradiation device according to the present invention includes a rotating laser light source and a concave mirror that reflects the laser light.

[For production]

Laser light from a rotating laser light source is reflected by a concave mirror, becomes a linear light beam, and is irradiated onto a three-dimensional object.

By irradiating the laser beam while changing the relative position of the laser beam irradiation device and the three-dimensional object in steps, a camera captures an isometric line image curved by the three-dimensional object.

The movement of the relative position between the laser light source and the three-dimensional object is
This is carried out along the Y and Z axes, and images are taken along equal dimensions in each direction.

〔Example〕

FIG. 1 is a mechanical diagram of an embodiment of the present invention. In the figure, reference numeral 1 denotes a frame, on which are installed laser beam irradiation devices 2 to 6 that move along the X, Y, or Z axes. The laser beam irradiation device 2 is arranged on the upper surface of the frame 1 and moves in the X-axis direction. Reference numeral 7 denotes a frame extending between the upper sides 8.9 of the frame body 1, both ends of which are bent so as to be slidable along guide rails 10 provided on the upper sides 8.9. A Nando 11 is installed in the middle of the frame 7, and the upper side 12.13
A screw shaft 14 passed between them is screwed. The screw shaft 14 is rotationally driven by a pulse motor 14a, so that the frame 7 moves along the screw shaft 14 via the NAND 11, that is, in the X-axis direction. A clamping plate 16 in which a narrow concave mirror 15 (made by mirror-polishing a parabolic surface) facing inward is sandwiched is fixed to the frame 7 . A laser oscillator 17 is installed on the holding plate 16 and emits point-shaped laser light toward the concave mirror 15. A swing motor 18 is attached to the laser oscillator 17 so that the laser beam is swung along the concave mirror 15.

The concave mirror 15 has a parabolic shape and, as shown in FIG. 2, reflects all the irradiated laser light in parallel. Therefore, the object to be measured (three-dimensional object) is irradiated with a straight laser beam. Frame 7 is a pulse motor 14
Since the linear irradiation light moves in a stepwise manner due to the action of a, the object to be measured is also irradiated with the linear irradiation light at regular intervals.

The laser beam irradiation devices 3 to 6 are also configured similarly to the laser beam irradiation device 2. However, the laser beam irradiation device 5.6 is opposed to the table 19 on which the three-dimensional object is placed, and is moved in the depth direction (Z-axis direction) in synchronization. Further, the laser beam irradiation device 3.4 is arranged outside the laser beam irradiation device 5.6 by extending the bent portion 7a of the frame 7,
Synchronize and move in the vertical direction (Y-axis direction).

The table 19 is usually rotatable by a pulse motor 20, for example, by 90 degrees, so that both sides and the back of the object to be measured (three-dimensional object) can also be photographed. Reference numeral 21 denotes a camera (including a video camera), which is configured to be movable in steps in the depth direction of the object to be measured. By doing so, the camera 21 can be moved to a position corresponding to the depth of field of the object to be measured on the table 19, and accurate results can be obtained even when photographing with a shallow depth of focus.

In order to make the device smaller, lighter, and less expensive, it is necessary to limit the output light of the laser light source, so the shutter of the camera 21 must be opened to take pictures using a low-output light source. be. In such a case, the depth of focus becomes very shallow, so it is convenient if the position of the camera 21 can be changed in steps.

FIG. 3 is a laser beam image of a three-dimensional object photographed by the apparatus according to the present invention (Yin and Yang are expressed in reverse). As shown in the figure, since the intervals between the laser beams can be set arbitrarily, the distance per interval can be set arbitrarily.

The continuous lines drawn on the object represent the irradiation light from the light source on the same axis. The intersection of the light from the X, Y, and Z axes provides coordinates of position for computer analysis of the shape of a three-dimensional object. It is easy to create a drawing of a three-dimensional object by computer analysis using information on this intersection, and it also takes less time.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a three-dimensional image analysis device that is capable of extremely high precision measurement and measurement with a simple configuration, and has the effect of easily creating drawings from the analysis data. .

[Brief explanation of the drawing]

Fig. 1 is a mechanical diagram of an embodiment of the present invention, Fig. 2 is a diagram showing the configuration of a laser beam irradiation device, and Fig. 3 is an example of an image taken by a laser beam of a three-dimensional object photographed by the device according to the present invention. It is a diagram. Explanation of symbols 1-frame body, 2-6-laser beam irradiation device, 15--concave mirror, 17--laser oscillator, 19-table, 21-camera Fig. 2 Fig. 3

Claims (3)

[Claims] (1) A device for non-contact analysis of the dimensions of a three-dimensional object, which includes a table on which the three-dimensional object is placed, and a laser that moves and rotates along the X, Y, and Z axes of the three-dimensional object. A laser beam irradiation device that emits a laser beam from a light source in a straight line using a concave mirror, and a camera that records a linear locus formed by the irradiation of the laser beam, and the laser beam is directed toward the three-dimensional object. A three-dimensional image analysis device that irradiates light at predetermined intervals. (2) The three-dimensional image analysis device according to claim 1, wherein the table rotates. (3) The three-dimensional image analysis device according to claim 1, wherein the camera is configured to be movable stepwise in the depth direction of the object.