DEVICE AND METHOD FOR THREE-DIMENSIONAL OPTICAL MEASUREMENT

Abstract

The device 1 is described for three-dimensional optical measurement of objects 2 using a topometric measurement method, in which images of projection patterns which have been projected onto an object 2 are recorded and evaluated. The device 1 has a projector 3 with a light source, an image recording unit 5 and an image evaluation unit 6. The light source for the projector 3 is an arc lamp 4, and the image recording unit 5 is designed for synchronization of image recording with the light intensity of the arc lamp 4.

Description

The invention will be explained in more detail in the following text using the attached drawings, by way of example, in which:

FIG. 1 shows a sketch of a device for three-dimensional optical measurement of objects;

FIG. 2 shows a schematic current waveform/light intensity profile of an arc lamp with a square-wave current waveform with an additional pulse shortly before commutation;

FIG. 3 shows a schematic illustration of the light intensity profile and of the image recording with an untriggered illumination time for different exposure times; and

FIG. 4 shows a schematic illustration of the light intensity profile and of the image recording with a triggered illumination time for different exposure times.

Claims

1. A device (1) for three-dimensional optical measurement of objects (2) using a topometric measurement method, in which images of projection patterns which have been projected onto an object (2) are recorded and evaluated, with the device having a projector (3) with a light source, an image recording unit (5) and an image evaluation unit (6), wherein, the light source for the projector (3) is an arc lamp (4), and the image recording unit (5) is designed for synchronization of image recording and/or of the image evaluation unit with the light intensity of the arc lamp (4).

2. The device (1) as claimed in claim 1, wherein the image recording unit (5) is designed for synchronization of image recording as a function of a trigger signal of the arc lamp (4).

3. The device (1) as claimed in claim 1, wherein the image recording unit (5) and the projector (3) are electrically connected to one another and are designed for synchronization by triggering of the current waveform of the arc lamp (4) over time by means of a trigger signal of the image recording unit (5).

4. The device (1) as claimed in claim 1, wherein the arc lamp (4) and the image recording unit (5) are designed for synchronization with an external trigger signal.

5. The device (1) as claimed in claim 1, characterized in that the image evaluation unit (6) is designed for mathematical compensation for changes in the light intensity as a function of the previously recorded image recording time in the known light intensity profile over time.

6. The device (1) as claimed in claim 1, characterized in that the image recording unit (5) comprises at least one camera.

7. A method for three-dimensional optical measurement of objects using a topometric measurement method, in which images of projection patterns which have been projected onto an object (2) by a projector (3) are recorded by an image recording unit (5) and are evaluated by an image evaluation unit (6), comprising synchronization of image recording and/or image evaluation with the light intensity of an arc lamp (4) of the projector (3).

8. The method as claimed in claim 7, comprising synchronization of image recording as a function of a trigger signal of the arc lamp (4).

9. The method as claimed in claim 7 comprising synchronization of image recording by triggering of the cur-rent waveform of the arc lamp (4) over time by means of a trigger signal of the image recording unit (5).

10. The method as claimed in claim 7, comprising synchronization of the image recording unit (5) with the light intensity of the arc lamp (4) as a function of an external trigger signal for the image recording unit (5) and the projector (3).

11. The method as claimed in claim 7, comprising mathematical compensation for changes in the light intensity as a function of the previously recorded image recording time in the known light intensity profile over time.