System and method for three dimensional image acquisition and processing of a borehole wall

• US 5,717,455 A
• Filed: 07/02/1996
• Issued: 02/10/1998
• Est. Priority Date: 07/02/1996
• Status: Expired due to Fees

• Current Assignee: RAAX Company Limited
• Original Assignee: RAAX Company Limited
• Inventors: Kamewada, Shunichi
• Primary Examiner(s): Chin, Tommy P.
• Assistant Examiner(s): LEE, Y YOUNG
• Application Number:
  US08/674,397
• Time in Patent Office: 588 Days
• Field of Search: 348/46, 348/85, 348/84, 348/45, 348/42, 348/49, 348/337, 356/241, 362/349, 359/599, 359/641, 359/831, 359/833, 359/834, 359/838, 359/850, 359/857, 359/864, 359/894, 359/211
• US Class Current: 348/85
• CPC Class Codes: G02B 23/2415 Stereoscopic endoscopes

Abstract

This invention provides a three dimensional image acquisition and processing method and system that enable three dimensional viewing of an underground borehole wall. Also provided are a cylindrical straight prism and a counter cylindrical straight prism that are used in this method and system of three dimensional viewing of a borehole wall.

Claims

1. A method for producing a three dimensional image of a borehole wall, the method comprising the steps of:

receiving a first visual image from a portion of a borehole wall through a cylindrical prism device, wherein the cylindrical prism device is located in the interior of the borehole, said cylindrical prism device comprising a transparent cylinder which includes a plurality of triangular columns and a plurality of grooves along a circumference of the cylinder, wherein each of the plurality of grooves is between a corresponding pair of the plurality of triangular columns;

receiving a second visual image from the portion of the borehole wall through said cylindrical prism device, wherein the second visual image is from a different orientation of the borehole wall than the first visual image;

reflecting the first visual image on a conical mirror that is located inside the cylindrical prism device to create a first ring-shaped image of the borehole wall;

reflecting the second visual image on the conical mirror to create a second ring-shaped image of the borehole wall that is located adjacent to the fast ring shaped image; and

processing the first and second ring shaped images by dividing the images into sections in order to create a left eye viewing image and a right eye viewing image.

8. The method according to claim 1, wherein the shape of the cross-section of each of the plurality of triangular columns is an isosceles triangle.

9. The method according to claim 1, said cylindrical prism device further comprising a first cylindrical prism having a central axis and a second cylindrical prism having a central axis coincident with the central axis of the first cylindrical prism,

the first cylindrical prism being a cylindrical straight prism and the second cylindrical prism being a counter cylindrical straight prism, and

the cylindrical straight prism and the counter cylindrical straight prism each being made of a transparent material.

10. The method according to claim 9, wherein said cylindrical straight prism is adjacent said counter cylindrical straight prism.

11. The method according to claim 10, wherein the shape of the cross-section of each of said plurality of triangular columns is a right triangle, the orientation of each of the plurality of triangular columns in the counter cylindrical straight prism being the reverse of the orientation of each of the plurality of triangular columns in the cylindrical straight prism.

2. A system for producing a three dimensional image of a borehole wall, the system comprising:

a surveying body device;

a cylindrical prism device having a central axis, wherein the cylindrical prism device is connected to the surveying body device, said cylindrical prism device comprising a transparent cylinder which includes a plurality of triangular columns and a plurality of grooves along a circumference of the cylinder, wherein each of the plurality of grooves is between a corresponding pair of the plurality of triangular columns;

wherein a first and a second image of a portion of the borehole wall pass through the cylindrical prism device, said first and second images being images of the borehole wall from different orientations;

a camera device connected to the surveying body device;

a conical mirror device connected to the surveying body device, wherein the conical mirror device is located in the interior of and aligned along the center axis of the cylindrical prism device, wherein the first image of the borehole wall is received from the cylindrical prism device and reflected by the conical mirror device to the camera device, wherein the second image of the borehole wall is received from the cylindrical prism device and reflected by the conical mirror device to the camera device; and

an image processing device connected to the camera device, wherein the first and second images of the borehole wall from the camera device are received by the image processing device, wherein the image processing device converts the first and second images of the borehole wall into a a left eye image and a right eye image.

3. The system according to claim 2 wherein the conical mirror device is longer than the height of the cylindrical prism device.

4. The system according to claim 2 wherein the conical mirror device further comprises a first conical mirror and a second conical mirror, wherein the slope of the first conical mirror is not equal to the slope of the second conical mirror.

5. The system according to claim 2 further comprising a correctional lens device positioned relative to the conical mirror device and the camera device so that all images that pass through the cylindrical prism device intersect the center axis of the conical mirror device at a right angle.

6. The system according to claim 2 wherein the conical mirror device, s a rotating parabolic mirror, positioned relative to the cylindrical prism device so that all images that pass through the cylindrical prism device intersect the center axis of the conical mirror device at a right angle.

7. The system according to claim 2 wherein the conical mirror device is a flat top conical mirror that includes a hole or a cylinder shaped transparent material positioned along the center axis of the conical mirror device, wherein an image of an azimuth sensor is received at the camera along with the images of the borehole wall.

12. The system according to claim 2, wherein the shape of the cross-section of each of the plurality of triangular columns of said cylindrical straight prism and said counter cylindrical straight prism is an isosceles triangle.

13. The system according to claim 2, said cylindrical prism device further comprising a first cylindrical straight prism and a second counter cylindrical straight prism,

said first cylindrical straight prism and said second counter cylindrical straight prism each having a central axis coincident with the axis of the cylindrical prism device, wherein each comprises a transparent material.

14. The system according to claim 13, wherein said cylindrical straight prism is adjacent said counter cylindrical straight prism.

15. The system according to claim 14, wherein the shape of the cross-section of each of said plurality of triangular columns of said cylindrical straight prism and said counter cylindrical straight prism is a right triangle, the orientation of each of the plurality of triangular columns in the counter cylindrical prism being the reverse of the orientation of each of the plurality of triangular columns in the cylindrical straight prism.