Stereo-measurement borescope with 3-D viewing

• US 7,564,626 B2
• Filed: 12/18/2006
• Issued: 07/21/2009
• Est. Priority Date: 01/25/2002
• Status: Expired due to Term

• Current Assignee: Waygate Technologies USA LP (Baker Hughes Company)
• Original Assignee: GE Inspection Technologies LP (General Electric Company)
• Inventors: Chilek, Theodore A., Lia, Raymond, Salvati, Jon R., Bendall, Clark A.
• Primary Examiner(s): FINEMAN, LEE A
• Application Number:
  US11/640,716
• Publication Number:
  US 20070165306A1
• Time in Patent Office: 946 Days
• Field of Search: 359/462, 359/464, 600/101, 600/166, 348/45, 348/49, 348/51, 348/54, 348/65
• US Class Current: 359/462
• CPC Class Codes: A61B 1/0005 combining images e.g. side-by-side, superimposed or tiled
• CPC Class Codes: A61B 1/00096 Optical elements
• CPC Class Codes: A61B 1/00181 for multiple fixed viewing angles A61B1/00193 takes precedence
• CPC Class Codes: A61B 1/00188 with focusing or zooming features
• CPC Class Codes: A61B 1/00193 adapted for stereoscopic vision
• CPC Class Codes: A61B 1/05 characterised by the image sensor, e.g. camera, being in the distal end portion
• CPC Class Codes: G02B 23/2415 Stereoscopic endoscopes

Abstract

Two stereo images are created by splitting a single image into two images using a field of view dividing splitter. The two images can be displayed side by side so that they can be viewed directly using stereopticon technology, heads-up display, or other 3-D display technology, or they can be separated for individual eye viewing. The two images focus on one imager such that the right image appears on the right side of the monitor and the left image appears on the left side of the monitor. The view of the images is aimed to converge at a given object distance such that the views overlap 100% at the object distance. Measurement is done with at least one onscreen cursor.

Claims

1. A method for accurately positioning an onscreen cursor for purposes of performing a measurement on an image, said method comprising the steps of:

placing a probe in relation to an object of interest;

displaying at least one image of said object of interest as captured by an optical system of said probe;

displaying a first measurement cursor overlay on said at least one image of said object of interest;

displaying a first magnified view of a first portion of said at least one image of said object of interest concurrently with said at least one image of said object of interest, said first magnified view including a predetermined area surrounding said first measurement cursor overlay and a first magnified view measurement cursor overlay displayed at a position on said object of interest corresponding to the position of said first measurement cursor overlay on said object of interest, wherein said first magnified view does not obstruct said first measurement cursor overlay;

placing said first magnified view measurement cursor overlay within said first magnified view to select a first measurement point on said object of interest;

displaying a second measurement cursor overlay on said at least one image of said object of interest; and

placing said second measurement cursor overlay to select a second measurement point on said object of interest, wherein said second measurement point is outside of said first magnified view;

wherein said first measurement point and said second measurement point are used for determining at least one geometric characteristic of said object of interest.

2. A method as recited in claim 1, wherein said at least one geometric characteristic includes at least a measurement of distance to said object of interest to enhance a focus of said at least one image of said object of interest using deconvolution techniques.

3. A method as recited in claim 1, wherein said optical system is capable of capturing adjacent first and second stereo images of said object of interest for focusing onto an electronic imaging device, said displaying at least one image step including the step of displaying both said first and second stereo images of said object of interest, said displaying a first magnified view step including the step of displaying said first magnified view of a first portion of each of said first and second stereo images, said first magnified view including said first magnified view measurement cursor overlay.

4. A method as recited in claim 1, wherein said placing said first magnified view measurement cursor overlay within said first magnified view results in corresponding placement of said first measurement cursor overlay on said image.

21. A method as recited in claim 1 further comprising the step of:

displaying a second magnified view of a second portion of said at least one image of said object of interest concurrently with said at least one image of said object of interest, said second magnified view including said predetermined area surrounding said second measurement cursor overlay and a second magnified view measurement cursor overlay displayed at a position on said object of interest corresponding to the position of said second measurement cursor overlay on said object of interest, wherein said second magnified view does not obstruct said second measurement cursor overlay; and

placing said second magnified view measurement cursor overlay within said second magnified view to select a second measurement point on said object of interest.

5. An endoscopic imaging and measurement system, comprising:

a probe placed in relation to an object of interest;

an optical system of said probe comprising at least one focusing lens and an electronic imaging device, said optical system capturing at least one image of said object of interest, and said at least one image being focused onto said electronic imaging device;

a display for displaying said at least one image of said object of interest;

said display further displaying a first measurement cursor overlay on said at least one image of said object of interest;

said display further displaying a first magnified view of a first portion of said at least one image of said object of interest concurrently with said at least one image of said object of interest, said first magnified view including a predetermined area surrounding said first measurement cursor overlay and a first magnified view measurement cursor overlay displayed at a position on said object of interest corresponding to the position of said first measurement cursor overlay on said object of interest, wherein said first magnified view does not obstruct said first measurement cursor overlay and allows placing said first magnified view measurement cursor overlay within said first magnified view to select a first measurement point on said object of interest; and

said display further displaying a second measurement cursor overlay on said at least one image of said object of interest to select a second measurement point on said object of interest, wherein said second measurement point is outside of said first magnified view;

wherein said first measurement point and said second measurement point are used for determining at least one geometric characteristic of said object of interest.

6. A system as recited in claim 5, wherein said at least one geometric characteristic includes at least a measurement of distance to said object of interest to enhance a focus of said at least one image using deconvolution techniques.

7. A system as recited in claim 5, further comprising an optical characteristics data set for determining said at least one geometric characteristic.

8. A system as recited in claim 7, wherein a user is signaled that a detachable distal tip emplaced on said probe may have been incorrectly identified if a difference between said optical characteristics data set and global alignment data determined from said at least one image exists.

9. A system as recited in claim 8, wherein said system is adapted for receiving one of a plurality of detachable probe tips, each of said detachable probe tips having a corresponding said optical characteristics data set so as to provide a plurality of total optical characteristics data sets, and wherein data determined from said at least one image is used to select which of said plurality of total optical characteristics data sets corresponds to said detachable probe tip emplaced on said probe.

10. A system as recited in claim 7, wherein said system is used in an inspection device, said system further comprising calibration means for generating said optical characteristics data set of said device.

11. A system as recited in claim 10, wherein said calibration means includes means for color balancing.

12. A system as recited in claim 7, wherein said optical characteristics data set includes optical mapping distortion, magnification at one or more object target distances, and parallax information.

13. A system as recited in claim 7, wherein said optical characteristics data set is stored in non-volatile memory in said probe.

14. A system as recited in claim 7, further comprising adjusting means for adjusting said optical characteristics data set of said system to increase the accuracy of data corresponding to said at least one geometric characteristic when a distal portion of said probe is operated in a medium with an index of refraction which differs from that of air.

15. A system as recited in claim 5, further comprising means for indicating a measurement accuracy of data corresponding to said at least one geometric characteristic, wherein said measurement accuracy is determined based at least on distance of said object of interest.

16. A system as recited in claim 15, wherein said indicating means includes means for an operator to designate a maximum estimated error limit for said measurement accuracy above which said system indicates a warning.

17. A system as recited in claim 5, further comprising means for displaying a symbol indicative both of a type of measurement being performed and of a role of said first measurement cursor overlay and said second measurement cursor overlay in said type of measurement.

18. A system as recited in claim 17, wherein at least one measurement point designated by a user when performing said one type of measurement is displayed even when a different type of measurement is selected.

19. A system as recited in claim 5, wherein data corresponding to said at least one geometric characteristic is stored in a single file as non-viewable data along with said at least one image.

20. A system as recited in claim 5, wherein said optical system is a stereo optical system for capturing a pair of images of said object of interest and enabling first and second adjacent stereo images of said object of interest to be focused onto said electronic imaging device.

22. A system as recited in claim 5, wherein said display further displays a second magnified view of a second portion of said at least one image of said object of interest concurrently with said at least one image of said object of interest, said second magnified view including said predetermined area surrounding said second measurement cursor overlay and a second magnified view measurement cursor overlay displayed at a position on said object of interest corresponding to the position of said second measurement cursor overlay on said object of interest, wherein said second magnified view does not obstruct said second measurement cursor overlay and allows placing said second magnified view measurement cursor overlay within said second magnified view to select a second measurement point on said object of interest.

23. A system as recited in claim 5, wherein said placing said first magnified view measurement cursor overlay within said first magnified view results in corresponding placement of said first measurement cursor overlay on said image.