Three-dimensional measuring method and system

• US 20020118274A1
• Filed: 01/31/2002
• Published: 08/29/2002
• Est. Priority Date: 01/31/2001
• Status: Active Grant

• Current Assignee: Minolta Corporation Limited (Konica Minolta Inc.)
• Original Assignee: Minolta Corporation Limited (Konica Minolta Inc.)
• Inventors: Yahashi, Akira
• Granted Patent: US 6,847,360 B2
• Time in Patent Office: Days
• US Class Current: 348/46
• CPC Class Codes: G01S 3/14 Systems for determining direction or deviation from predetermined direction aerial arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00; combinations of different interacting aerial units for giving a desired directional characteristic H01Q21/29; aerials or aerial systems providing at least two radiation patterns H01Q25/00
• CPC Class Codes: G06T 7/254 involving subtraction of images

Abstract

A three-dimensional measuring method comprising the following steps of: carrying out plural-time measurements with respect to a point on an object along the same line of vision using a three-dimensional measuring device; acquiring distance information on a distance between the point on the object and the three-dimensional measuring device for each measurement; determining a difference of the distance information of each point; making a decision such that the measurement is successful when the difference is smaller than a predetermined value; and making a decision such that the measurement is unsuccessful when the difference is larger than the predetermined value.

Claims

1. A three-dimensional measuring system comprising:

a measuring device for measuring a three-dimensional shape of an object;

a movement detecting device for making a detection whether or not an object to be measured moves during measurement; and

an output device for outputting a signal when a detection is made such that the object to be measured moves, the signal indicating the detection of the movement.

2. The three-dimensional measuring system according to claim 1, wherein the movement detecting device makes a detection whether or not the object to be measured moves based on plural-time measurement results.

3. The three-dimensional measuring system according to claim 1, wherein the system further includes a pick-up device for imaging a two-dimensional image of measuring object, and

the movement detecting device makes a detection whether or not the object to be measured moves based on an output of the pick-up device before and after measurement.

4. The three-dimensional measuring system according to claim 1, wherein the system further includes a distance measuring device for measuring a distance to the object to be measured, independently from the measuring device, and

the movement detecting device makes a detection whether or not the object to be measured moves based on an output of the distance measuring device before and after measurement.

5. A three-dimensional measuring method comprising the steps of:

carrying out plural-time measurements with respect to a point on an object along the same line of vision using a three-dimensional measuring device;

acquiring distance information on a distance between the point on the object and the three-dimensional measuring device for each measurement;

determining a difference of the distance information of each point; and

making a decision such that the measurement is successful when the difference is smaller than a predetermined value while making a decision such that the measurement is unsuccessful when the difference is larger than the predetermined value.

6. The three-dimensional measuring method according to claim 5, wherein any one of plural-time measurement results is employed as a three-dimensional shape of the object in the case where a decision is made such that the measurement is successful.

7. The three-dimensional measuring method according to claim 5, wherein the difference is determined with respect to only depth direction of a measuring range of the three-dimensional measuring device, and a decision is made whether measurement is successful or unsuccessful according to a relation between the difference and the predetermined value.

8. A three-dimensional measuring method comprising the steps of:

measuring a three-dimensional shape of an object;

acquiring a plurality of two-dimensional images with respect to the object when starting or completing the measurement or during the measurement;

determining a difference between the acquired two-dimensional images; and

making a decision such that the measurement is successful when the difference is smaller than a predetermined value while making a decision such that the measurement is unsuccessful when the difference is larger than the predetermined value.

9. The three-dimensional measuring method according to claim 8, wherein a point or line expressing features of the object is extracted from the two-dimensional image, and the difference is determined based on the extracted point or line.

10. A three-dimensional measuring system comprising:

a three-dimensional measuring device for measuring a three-dimensional shape of an object;

a distance information acquiring device for acquiring distance information on a distance between a point on the object and the three-dimensional measuring device for each measurement by the three-dimensional measuring device;

a difference detecting device for detecting a difference of the distance information with respect to the point on the object along the same line of vision in the measurement by the three-dimensional measuring device; and

a determining device for comparing the difference with a predetermined value, and for making a decision whether measurement is successful or unsuccessful.

11. A three-dimensional measuring system comprising:

a three-dimensional measuring device for measuring a three-dimensional shape of an object;

an image acquiring device for acquiring a plurality of two-dimensional images with respect to the object when starting or completing measurement or during the measurement;

a difference detecting device for detecting a difference between the acquired two-dimensional images; and

a determining device for comparing the difference with a predetermined value, and for making a decision whether measurement is successful or unsuccessful.