Projection device for three-dimensional measurement, and three-dimensional measurement system

• US 20070091174A1
• Filed: 09/26/2006
• Published: 04/26/2007
• Est. Priority Date: 09/30/2005
• Status: Abandoned Application

• Current Assignee: Topcon Corporation
• Original Assignee: Topcon Corporation
• Inventors: Kochi, Nobuo, Watanabe, Hiroto, Yamada, Mitsuharu, Moriyama, Takuya
• Application Number:
  US11/526,885
• Publication Number:
  US 20070091174A1
• Time in Patent Office: Days
• US Class Current: 348/135
• CPC Class Codes: G01B 11/2509 Color coding
• CPC Class Codes: G01B 11/2545 with one projection direction and several detection directions, e.g. stereo
• CPC Class Codes: G01C 11/06 by comparison of two or more pictures of the same area
• CPC Class Codes: H04N 13/204 using stereoscopic image cameras stereoscopic photography G03B35/00
• CPC Class Codes: H04N 13/239 using two 2D image sensors having a relative position equal to or related to the interocular distance H04N13/243 takes precedence
• CPC Class Codes: H04N 13/243 using three or more 2D image sensors

Abstract

The object of the invention is to improve the efficiency of and promote the automation of non-contact three-dimensional measurement over a wide area utilizing a projection device for projecting a target pattern. A projection device for three-dimensional measurement 80 according to the invention includes: a projection section 12 for projecting onto the shape of a measuring object a measurement pattern P indicating measurement points Q; a pattern projection control section 493 for controlling the projection section 12 to project the measurement pattern P; a pattern detection section 491 for detecting the measurement points Q from a photographed image of the measurement pattern P projected by the projection section 12; and a pattern forming section 492 for forming, based on displacement of the measurement points Q in a first measurement pattern detected by the pattern detection section 491, a second measurement pattern where the measurement points are increased, deleted or changed.

Claims

1. A projection device for three-dimensional measurement, comprising:

a projection section for projecting onto a measuring object a measurement pattern indicating measurement points;

a pattern projection control section for controlling the projection section to project the measurement pattern;

a pattern detection section for detecting the measurement points from a photographed image of the measurement pattern projected by the projection section; and

a pattern forming section for forming, based on displacement of the measurement points in a first measurement pattern detected by the pattern detection section, a second measurement pattern where the measurement points are increased, deleted or changed.

3. The projection device for three-dimensional measurement as recited in claim 1, further comprising:

a photographing section for photographing the measurement pattern projected by the projection section,

wherein the pattern detection section detects the measurement points from an image of the measurement pattern photographed by the photographing section.

5. A three-dimensional measurement system comprising:

the projection device for three-dimensional measurement as recited in claim 1, wherein the photographed image is a stereo image pair; and

an orientation section for determining orientation of the stereo image pair,

wherein the orientation section determines the orientation using the second measurement pattern or the third measurement pattern.

7. A three-dimensional measurement system comprising:

the projection device for three-dimensional measurement as recited in claim 1;

and

a three-dimensional coordinate data calculation section for calculating three-dimensional coordinates of the measuring object,

wherein the three-dimensional coordinate data calculation section calculates the three-dimensional coordinates using the second measurement pattern or the third measurement pattern.

2. A projection device for three-dimensional measurement, comprising:

a projection section for projecting onto a measuring object a measurement pattern indicating measurement points;

a pattern storage section for storing a plurality of the measurement patterns;

a pattern selection section for selecting a measurement pattern to be projected, from the plurality of the measurement patterns stored in the pattern storage section;

a pattern projection control section for controlling the projection section to project the measurement pattern selected by the pattern selection section; and

a pattern detection section for detecting the measurement points from a photographed image of the measurement pattern projected by the projection section,

wherein the pattern selection section selects, based on displacement of the measurement points in a first measurement pattern detected by the pattern detection section, a third measurement pattern where the measurement points are increased, deleted or changed, out of the plurality of the measurement patterns stored in the pattern storage section.

4. The projection device for three-dimensional measurement as recited in claim 2, further comprising:

a photographing section for photographing the measurement pattern projected by the projection section,

wherein the pattern detection section detects the measurement points from an image of the measurement pattern photographed by the photographing section.

6. A three-dimensional measurement system comprising:

the projection device for three-dimensional measurement as recited in claim 2, wherein the photographed image is a stereo image pair; and

an orientation section for determining orientation of the stereo image pair,

wherein the orientation section determines the orientation using the second measurement pattern or the third measurement pattern.

8. A three-dimensional measurement system comprising:

the projection device for three-dimensional measurement as recited in claim 2;

and

a three-dimensional coordinate data calculation section for calculating three-dimensional coordinates of the measuring object,

wherein the three-dimensional coordinate data calculation section calculates the three-dimensional coordinates using the second measurement pattern or the third measurement pattern.

9. A calculation processing section of a projection device for three-dimensional measurement having a projection section for projecting a measurement pattern onto a measuring object and detecting a predetermined data from a photographed image of the measurement pattern projected onto the measuring object, the calculation processing section comprising:

a pattern projection control section for controlling the projection section to project onto the measuring object a measurement pattern indicating measurement points;

a pattern detection section for detecting the measurement points from a photographed image of the measurement pattern projected by the projection section; and

a pattern forming section for forming, based on displacement of the measurement points in a first measurement pattern detected by the pattern detection section, a second measurement pattern where the measurement points are increased, deleted or changed.

10. A method for projecting a three-dimensional measurement pattern comprising the steps of:

storing plural measurement patterns indicating measurement points;

projecting onto a measuring object a first measurement pattern out of the plural measurement patterns;

photographing the first measurement pattern projected in the step of projecting;

detecting measurement points from an image of the first measurement pattern photographed in the step of photographing;

forming, based on displacement of measurement points in the first measurement pattern detected in the step of detecting, a second measurement pattern where the measurement points are increased, deleted or changed; and

projecting the second measurement pattern onto the measuring object.

12. The method for projecting a three-dimensional measurement pattern as recited in claim 10,

wherein an image photographed in the step of photographing is a stereo image pair;

and

the method further comprising the steps of;

determining orientation of the stereo image; and

measuring three-dimensional shape of the measuring object,

wherein the measurement points added to the second measurement pattern or the third measurement pattern are projected as reference points in the steps of determining orientation or of measuring three-dimensional shape.

11. A method for projecting a three-dimensional measurement pattern comprising the steps of;

storing plural measurement patterns indicating measurement points;

projecting onto a measuring object a first measurement pattern out of the plural measurement patterns;

photographing the first measurement pattern projected in the step of projecting;

detecting measurement points from an image of the first measurement pattern photographed in the step of photographing;

selecting, based on displacement of measurement points in the first measurement pattern detected in the step of detecting, a third measurement pattern where the measurement points are increased, deleted or changed out of the measurement patterns stored in the step of storing; and

projecting the third measurement pattern onto the measuring object.

13. The method for projecting a three-dimensional measurement pattern as recited in claim 11,

wherein an image photographed in the step of photographing is a stereo image pair;

and

the method further comprising the steps of;

determining orientation of the stereo image; and

measuring three-dimensional shape of the measuring object,

wherein the measurement points added to the second measurement pattern or the third measurement pattern are projected as reference points in the steps of determining orientation or of measuring three-dimensional shape.

14. A projection device for three-dimensional measurement, comprising:

a pattern forming section for forming a measurement pattern including a color-coded mark having a position detection pattern for indicating a measurement position, and a color code pattern colored with plural colors to allow identification of the mark and located in a predetermined position relative to the position detection pattern;

a projection section for projecting onto a measuring object the measurement pattern formed by the pattern forming section; and

a pattern detection section for detecting the position detection pattern and the color code pattern from a photographed image of the measurement pattern projected by the projection section to identify a color code.

16. The projection device for three-dimensional measurement as recited in claim 14, further comprising:

a photographing section for photographing the measurement pattern projected by the projection section,

wherein the pattern detection section detects the position detection pattern and the color code pattern from an image of the measurement pattern photographed by the photographing section to identify a color code.

15. A projection device for three-dimensional measurement, comprising:

a pattern storage section for storing a plurality of measurement patterns including a color-coded mark having a position detection pattern for indicating a measurement position, and a color code pattern colored with plural colors to allow identification of the mark and located in a predetermined position relative to the position detection pattern;

a pattern selection section for selecting a measurement pattern to be projected, out of the plurality of measurement patterns stored in the pattern storage section;

a projection section for projecting onto a measuring object the measurement pattern selected by the pattern selection section; and

a pattern detection section for detecting the position detection pattern and the color code pattern from a photographed image of the measurement pattern projected by the projection section to identify a color code.

17. The projection device for three-dimensional measurement as recited in claim 15, further comprising:

a photographing section for photographing the measurement pattern projected by the projection section,

wherein the pattern detection section detects the position detection pattern and the color code pattern from an image of the measurement pattern photographed by the photographing section to identify a color code.

18. A calculation processing section of a projection device for three-dimensional measurement having a projection section for projecting a measurement pattern onto a measuring object and detecting a predetermined data from a photographed image of the measurement pattern projected onto the measuring object, the calculation processing section comprising:

a pattern forming section for forming a measurement pattern including a color-coded mark having a position detection pattern for indicating a measurement position and a color code pattern colored with plural colors to allow identification of the mark and located in a predetermined position relative to the position detection pattern;

a pattern projection control section for controlling the projection section to project the measurement pattern; and

a pattern detection section for detecting the position detection pattern and the color code pattern from a photographed image of the measurement pattern projected by the projection section to identify a color code.

19. A method for projecting a three-dimensional measurement pattern comprising the steps of:

forming a measurement pattern including a color-coded mark having a position detection pattern for indicating a measurement position, and a color code pattern colored with plural colors to allow identification of the mark and located in a predetermined position relative to the position detection pattern;

projecting onto a measuring object the measurement pattern formed in the step of forming;

photographing the measurement pattern projected in the step of projecting; and

detecting the position detection pattern and the color code pattern based on an image of the measurement pattern photographed in the step of photographing to identify a color code.

20. A method for projecting a three-dimensional measurement pattern comprising the steps of:

storing a plurality of measurement patterns including a color-coded mark having a position detection pattern for indicating a measurement position, and a color code pattern colored with plural colors to allow identification of the mark and located in a predetermined position relative to the position detection pattern;

selecting a measurement pattern to be projected out of the plurality of the measurement patterns stored in the step of storing;

projecting onto a measuring object the measurement pattern selected in the step of selecting;

photographing the measurement pattern projected in the step of projecting; and

detecting the position detection pattern and the color code pattern based on an image of the measurement pattern photographed in the step of photographing to identify a color code.