Position detector and attitude detector

• US 6,993,206 B2
• Filed: 03/18/2002
• Issued: 01/31/2006
• Est. Priority Date: 03/22/2001
• Status: Expired due to Fees

• Current Assignee: Nikon Corporation, Nikon Technologies Inc. (Nikon Corporation)
• Original Assignee: Nikon Corporation
• Inventors: Ohta, Tadashi, Ishino, Yukinobu
• Primary Examiner(s): MARIAM, DANIEL G
• Application Number:
  US10/098,354
• Publication Number:
  US 20020163576A1
• Time in Patent Office: 1,415 Days
• Field of Search: 382/103, 382/151, 382/216, 382/291, 382/293, 382/312, 345/581, 345/653, 345/654, 348/136, 348/169, 356/614, 358/1.5, 358/488
• US Class Current: 382/291
• CPC Class Codes: F41J 5/10 Cinematographic hit-indicating systems cinematographic targets F41J9/14

Abstract

A position detector displays a target on a given plane and adds a standard on the given plane in the vicinity of the target with the location of the standard known. An image of the given plane is formed on an image plane of an image sensor with an image of the standard included, a point in the image of the given plane which is formed at a predetermined position of the image plane corresponding to the point to be detected. An image processor identifies the image of the standard on the image plane to calculate the position of the point to be detected. The standard includes asymmetric pattern. The standard includes a first standard and a second standard sequentially added on the given plane, the difference being calculated accompanied with the plus sign or the minus sign. The image on the given plane is formed by means of a scanning, the image sensor reads out the sensed image upon the termination of at least one period of the scanning. The second standard is added upon the initiation of the scanning after the completion of reading out of the image of the first standard.

Claims

1. A position detector for detecting a position on a given plane, the position detector comprising:

a first controller that displays a target point on the given plane;

a second controller that displays a known standard on the given plane in a vicinity of the target point, the location of the standard being known;

an image sensor having an image plane on which an image that includes an image of the standard is formed, the image plane having a predetermined position;

an image processor that identifies the image of the standard on the image plane; and

a processor that calculates a position of a point on the given plane corresponding to the predetermined position on the image plane using parameters of an attitude of the image plane relative to the given plane based on the identified image of the standard.

2. The position detector according to claim 1, wherein the first controller displays the target point at different positions on the given plane, and wherein the second controller displays the known standard at different positions on the given plane in correspondence to the different positions of the target point.

3. The position detector according to claim 1, wherein the first controller displays one of different target points on the given plane, and wherein the second controller displays the known standard in the vicinity of the one of the different target points on the given plane.

4. The position detector according to claim 1, wherein the known standard includes asymmetric pattern.

5. The position detector according to claim 4, wherein the asymmetric pattern includes four marks forming a rectangle, one of the four marks being distinguishable from the others.

6. The position detector according to claim 1, wherein the known standard includes a first standard and a second standard sequentially displayed on the given plane, wherein the image sensor senses a first image that includes an image of the first standard and a second image that includes an image of the second standard, and wherein the processor includes a calculator that calculates a difference between the first image and the second image to identify the image of the standard.

7. The position detector according to claim 6, wherein the processor determines whether the difference is positive or negative at the identified standard.

8. The position detector according to claim 1, wherein the first controller forms an image by scanning the given plane, the target point is displayed as a part of the image formed by the scanning, and wherein the second controller displays the known standard as a part of the image formed by the scanning.

9. The position detector according to claim 8, wherein the image sensor reads out the sensed image upon the termination of at least one period of the scanning.

10. The position detector according to claim 8, wherein the known standard includes a first standard and a second standard sequentially displayed on the given plane, and wherein the second controller starts displaying the second standard upon the initiation of the scanning after the image sensor completes the reading out of the sensed image including the first standard.

11. A position detector for detecting a position on a given plane, the position detector comprising:

a controller that displays a known standard including an asymmetric pattern on the given plane;

an image sensor having an image plane on which an image that includes an image of the standard is formed, the image plane having a predetermined position;

an image processor that identifies the image of the standard on the image plane; and

a processor that calculates a position of a point on the given plane corresponding to the predetermined position on the image plane using parameters of an attitude of the given plane relative to the image plane based on the identified image of the standard.

12. The position detector according to claim 11, wherein the asymmetric pattern includes four marks forming a rectangle, one of the four marks being distinguishable from the others.

13. A position detector for detecting a position on a given plane, the position detector comprising:

a controller that displays on the given plane a known standard including a first standard and a second standard, the controller sequentially displaying the first standard and the second standard;

an image sensor having an image plane on which an image of the given plane is formed, a point in the image of the given plane which is formed at a predetermined position of the image plane corresponding to a point to be detected on the given plane, the image sensor sensing a first image that includes an image of the first standard and a second image that includes an image of the second standard;

an image processor that calculates a difference between the first image and the second image to identify the image of the standard on the image plane, the image processor determining whether the difference is positive or negative at the identified standard; and

a processor that calculates the position of the point to be detected on the basis of the identified image of the standard on the image plane.

14. The position detector according to claim 13, wherein the first standard and the second standard include a plurality of marks, respectively, the marks of the second standard being located at the same positions of the marks of the first standard with the pattern formed by the marks in the second standard being a reversal of that in the first standard.

15. An attitude detector for detecting an attitude of a given plane, the attitude detector comprising:

a controller that displays on the given plane a known standard including a first standard and a second standard, the controller sequentially displaying the first standard and the second standard;

an image sensor having an image plane on which an image of the given plane is formed, the image sensor sensing a first image that includes an image of the first standard and a second image that includes an image of the second standard;

an image processor that calculates a difference between the first image and the second image to identify the image of the standard on the image plane, the image processor determining whether the difference is positive or negative at the identified standard; and

a processor that calculates the attitude of the given plane on the basis of the identified image of the standard on the image plane.

16. The attitude detector according to claim 15, wherein the first standard and the second standard include a plurality of marks, respectively, the marks of the second standard being located at the same positions of the marks of the first standard with the pattern formed by the marks in the second standard being a reversal of that in the first standard.

17. A detector for detecting a standard on a given plane, the detector comprising:

a controller that forms an image on the given plane by scanning the given plane, the controller displaying the standard as a part of the image on the given plane formed by the scanning;

an image sensor having an image plane on which an image of the given plane is formed, the image including an image of the standard, a point in the image of the given plane which is formed at a predetermined position of the image plane corresponding to the point to be detected on the given plane, the image sensor reading out the sensed image upon termination of at least one period of the scanning;

an image processor that identifies the image of the standard on the image plane; and

a processor that calculates a position of the point to be detected on the given plane based on the identified image of the standard on the image plane.

18. A detector for detecting a standard on a given plane, the detector comprising:

a controller that forms an image on the given plane by scanning the given plane, the controller displaying the standard as a part of the image on the given plane formed by the scanning, the standard including a first standard and a second standard to be sequentially displayed;

an image sensor having an image plane on which an image of the given plane is formed, the image sensor sensing a first image that includes an image of the first standard and a second image that includes an image of the second standard; and

an image processor that identifies the image of the standard on the image plane in accordance with the first image and the second image,

wherein the controller starts displaying the second standard upon the initiation of the scanning after the image sensor completes the reading out of the sensed image that includes the first standard.

19. A position detector for detecting a position on a display plane, the position detector comprising:

an image generator that displays at least one standard mark in a vicinity of a target point on the display plane;

an image sensor having an image plane on which an image that includes an image of the standard is formed, a predetermined position of the image plane corresponding to a predetermined point;

an image processor that identifies the image of the standard on the image plane; and

a processor that calculates a position of the predetermined point on the display plane using parameters of an attitude of the image plane relative to the display plane on the basis of the identified image of the standard.