IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0971070
(2004-10-25)
|
등록번호 |
US-7460250
(2008-12-02)
|
발명자
/ 주소 |
- Keightley,John
- Cunha,Adriano
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
14 인용 특허 :
16 |
초록
▼
A method for measuring the range to multiple points on a surface by projecting a line of light onto the surface, imaging said line of light onto a photodetector, computing the centroid of said line of light, computing quality factors for each computed centroid and encoding the quality factors as one
A method for measuring the range to multiple points on a surface by projecting a line of light onto the surface, imaging said line of light onto a photodetector, computing the centroid of said line of light, computing quality factors for each computed centroid and encoding the quality factors as one or more bits in the centroid value, transmitting said centroid value to a data receiver, and computing the range to the surface for each point corresponding to each centroid value.
대표청구항
▼
The invention claimed is: 1. A method for measuring dimensions of an object, the method comprising the following steps: a) providing a sensor head having a laser line generator and a photodetector; b) projecting a line of laser light from said generator onto the object; c) detecting with said photo
The invention claimed is: 1. A method for measuring dimensions of an object, the method comprising the following steps: a) providing a sensor head having a laser line generator and a photodetector; b) projecting a line of laser light from said generator onto the object; c) detecting with said photodetector an image of said line reflected from the object; d) for each of a plurality of points in said image: i. generating a centroid; ii. generating a quality factor for said centroid, wherein said quality factor is indicative of a quality of said centroid; and iii. encoding said centroid and said quality factor in a centroid value; e) transmitting said centroid values from said sensor head; f) receiving said centroid values; g) decoding said centroid values into said centroids and said quality factors; h) comparing said quality factors to quality criteria; i) selecting from said centroids one or more selected centroids based on the comparison; j) for each selected centroid computing a range to the object. 2. The method according to claim 1, further comprising the following step: displaying a graphic representation of one or more of said ranges, said selected centroids, and said quality factors. 3. The method according to claim 2, wherein said graphic representation is an image of said object. 4. The method according to claim 1, wherein said quality factors are indicative of one of centroid amplitude, centroid base width, centroid symmetry, centroid half power band width and centroid continuity. 5. The method according to claim 1, wherein said quality criteria include maximum and minimum values of one of centroid amplitude, centroid base width, centroid symmetry, centroid half power band width and centroid continuity. 6. The method according to claim 1, wherein said quality criteria are one of user-defined and preset. 7. The method according to claim 1, further comprising the following step: varying one of a power of said line of laser light and an exposure of said image in response to said comparison of said quality factors to said quality criteria. 8. The method according to claim 1, wherein said line of laser light is generated by one of a static laser triangulation system and a dynamic laser triangulation system. 9. The method according to claim 1, wherein said centroid value is one of a 16 bit and a 24 bit value. 10. The method according to claim 9, wherein said centroid value is a 16 bit value and wherein said centroid is encoded in 14 bits and said quality factor is encoded in 2 bits of said centroid value. 11. A method for measuring dimensions of an object, the method comprising the following steps: a) providing a sensor head having a laser line generator and a photodetector; b) projecting onto the object a first line of laser light; c) detecting a first image of said first line reflected from the object; d) projecting onto the object a second line of laser light; e) detecting a second image of said second line reflected from the object; wherein said first and second images are reflected from substantially the same portion of the object; f) for each of a plurality of points in said first image: i) generating a first centroid; ii) generating a first quality factor for said first centroid, wherein said first quality factor is indicative of a quality of said first centroid; iii) encoding said first centroid and said first quality factor in a first centroid value; g) for each of a plurality of points in said second image: i) generating a second centroid; ii) generating a second quality factor for said second centroid, wherein said second quality factor is indicative of a quality of said second centroid; iii) encoding said second centroid and said second quality factor in a second centroid value; wherein each one of said plurality of points in said first image corresponds to one of said plurality of points in said second image, such that each of said first centroid values corresponds to one of said second centroid values; h) transmitting said first and second centroid values from said sensor head; i) receiving said first and second centroid values; j) decoding said first and second centroid values into said first and second centroids and said first and second quality factors; k) comparing said first quality factors to said second quality factors; l) selecting from said centroids one or more selected centroids based on the comparison of said quality factors; m) for each selected centroid computing a range to the object. 12. The method according to claim 11, further comprising the following step: displaying a graphic representation of one or more of said ranges, said selected centroids, and said quality factors. 13. The method according to claim 12, wherein said graphic representation is an image of said object. 14. The method according to claim 11, wherein said quality factors are indicative of one of centroid amplitude, centroid base width, centroid symmetry, centroid half power band width and centroid continuity. 15. The method according to claim 11, wherein said lines of laser light are generated by one of a static laser triangulation system and a dynamic laser triangulation system. 16. The method according to claim 11, wherein said centroid values are one of 16 bit and 24 bit values. 17. The method according to claim 16, wherein said centroid values are 16 bit values and wherein said centroids are encoded in 14 bits and said quality factors are encoded in 2 bits of said centroid value. 18. The method according to claim 11, wherein an exposure of said second image is greater than an exposure of said first image. 19. The method according to claim 11, wherein a power of said second line of laser light is greater than a power of said first line of laser light. 20. The method according to claim 11, wherein said selected centroids are selected in of real time and post-acquisition processing. 21. The method according to claim 11, further comprising the step of comparing quality factors of said selected centroids to quality criteria. 22. The method according to claim 21, wherein said quality criteria are one of user-defined and preset. 23. A method for measuring dimensions of an object, the method comprising the following steps: a) providing a sensor head having a laser line generator and a photodetector; b) projecting a line of laser light from said generator onto the object; c) detecting with said photodetector an image of said line reflected from the object; d) for each of a plurality of points in said image: i. generating a centroid; ii. generating a quality factor for said centroid, wherein said quality factor is indicative of a quality of said centroid; and iii. encoding said centroid and said quality factor in a centroid value; e) transmitting said centroid values from said sensor head; f) receiving said centroid values; g) decoding said centroid values into said centroids and said quality factors; h) comparing said quality factors to quality criteria; i) for each centroid computing a range to the object; and j) displaying a graphic representation of one or more of said ranges, said centroids, and said quality factors. 24. The method according to claim 23, wherein said graphic representation is an image of said object. 25. The method according to claim 23, wherein said quality factors are indicative of one of centroid amplitude, centroid base width, centroid symmetry, centroid half power band width and centroid continuity. 26. The method according to claim 23, wherein said quality criteria include maximum and minimum values of one of centroid amplitude, centroid base width, centroid symmetry, centroid half power band width and centroid continuity. 27. The method according to claim 23, further comprising the following step: varying one of a power of said line of laser light and an exposure of said image in response to said comparison of said quality factors to said quality criteria. 28. The method according to claim 23, wherein said line of laser light is generated by one of a static laser triangulation system and a dynamic laser triangulation system. 29. The method according to claim 23, wherein said centroid value is one of a 16 bit and a 24 bit value. 30. The method according to claim 28, wherein said centroid value is a 16 bit value and wherein said centroid is encoded in 14 bits and said quality factor is encoded in 2 bits of said centroid value. 31. The method according to claim 23, wherein said image of said object is color coded, and wherein said colors are reflective of said quality factors. 32. The method according to claim 23, wherein said quality criteria are one of user-defined and preset. 33. A method for optimizing exposure in a laser triangulation system, the method comprising the following steps: a) providing a sensor head having a laser line generator and a photodetector; b) projecting a line of laser light from said generator onto the object; c) detecting with said photodetector an image of said line reflected from the object; d) for each of a plurality of points in said image: i. generating a centroid; ii. generating a quality factor for said centroid, wherein said quality factor is indicative of a quality of said centroid; and iii. encoding said centroid and said quality factor in a centroid value; e) transmitting said centroid values from said sensor head; f) receiving said centroid values; g) decoding said centroid values into said centroids and said quality factors; h) comparing said quality factors to quality criteria; i) varying one of a power of said line of laser light and an exposure of said image in response to said comparison of said quality factors to said quality criteria. 34. The method according to claim 33, further comprising the following step: for each centroid computing a range to the object. 35. The method according to claim 33, further comprising the following step: displaying a graphic representation of at least one of said centroids and said quality factors. 36. The method according to claim 35, wherein said graphic representation is an image of said object. 37. The method according to claim 33, wherein said quality factors are indicative of one of centroid amplitude, centroid base width, centroid symmetry, centroid half power band width and centroid continuity. 38. The method according to claim 33, wherein said quality criteria include maximum and minimum values of one of centroid amplitude, centroid base width, centroid symmetry, centroid half power band width and centroid continuity. 39. The method according to claim 33, wherein said line of laser light is generated by one of a static laser triangulation system and a dynamic laser triangulation system. 40. The method according to claim 33, wherein said centroid value is one of a 16 bit and a 24 bit value. 41. The method according to claim 40, wherein said centroid value is a 16 bit value and wherein said centroid is encoded in 14 bits and said quality factor is encoded in 2 bits of said centroid value. 42. The method according to claim 33, wherein said quality criteria are one of user-defined and preset.
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