Displacement estimation system and method

• US 20060047462A1
• Filed: 08/31/2004
• Published: 03/02/2006
• Est. Priority Date: 08/31/2004
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Gao, Jun, Picciotto, Carl E.
• Application Number:
  US10/931,005
• Publication Number:
  US 20060047462A1
• Time in Patent Office: Days
• US Class Current: 702/120
• CPC Class Codes: G06T 7/254 involving subtraction of images

Abstract

A displacement estimation system comprising a data acquisition system and a processing system is provided. The data acquisition system is configured to capture a first frame from a first substrate including a first pattern at a first time and capture a second frame from a second substrate including a second pattern at a second time subsequent to the first time. The first pattern and the second pattern are substantially identical. The processing system is configured to calculate a displacement between the first pattern and the second pattern using the first frame and the second frame.

Claims

1. A displacement estimation system comprising:

a data acquisition system; and

a processing system;

wherein the data acquisition system is configured to capture a first frame from a first substrate including a first pattern at a first time and capture a second frame from a second substrate including a second pattern at a second time subsequent to the first time, wherein the first pattern and the second pattern are substantially identical, and wherein the processing system is configured to calculate a displacement between the first pattern and the second pattern using the first frame and the second frame.

2. The displacement estimation system of claim 1 wherein the data acquisition system is configured to provide the first frame and the second frame to the processing system, wherein the processing system is configured to identify the first pattern in the first frame, and wherein the processing system is configured to identify the second pattern in the second frame.

3. The displacement estimation system of claim 1 further comprising:

an adjustment system configured to receive the displacement from the processing system;

wherein the adjustment system is configured to adjust a position of the second substrate using the displacement.

4. The displacement estimation system of claim 1 further comprising:

a position adjustment system configured to receive the displacement from the processing system;

wherein the position adjustment system is configured to adjust a position of a functional unit relative to a third substrate using the displacement.

5. The displacement estimation system of claim 4 wherein the third substrate includes the second substrate.

6. The displacement estimation system of claim 1 wherein the first substrate includes the second substrate, and wherein the first pattern includes the second pattern.

7. The displacement estimation system of claim 6 wherein the first substrate is moved relative to the data acquisition system subsequent to the first time and prior to the second time.

8. The displacement estimation system of claim 6 wherein the first substrate is removed from the displacement estimation system entirely subsequent to the first time and replaced in the displacement estimation system prior to the second time.

9. The displacement estimation system of claim 1 wherein the first substrate is removed from the displacement estimation system entirely subsequent to the first time, and wherein the second substrate is placed in the displacement estimation system prior to the second time.

10. The displacement estimation system of claim 1 wherein the first substrate and the second substrate are each selected from the group consisting of a semiconductor wafer, paper, and a web of material.

11. The displacement estimation system of claim 1 wherein the first pattern and the second pattern each comprise a man-made pattern.

12. The displacement estimation system of claim 1 wherein the first pattern naturally occurs on the first substrate, and wherein the second pattern naturally occurs on the second substrate.

13. The displacement estimation system of claim 1 wherein the data acquisition system comprises an optical system.

14. The displacement estimation system of claim 13 wherein the data acquisition system comprises at least one camera.

15. The displacement estimation system of claim 1 wherein the data acquisition system comprises a non-optical system.

16. The displacement estimation system of claim 1 wherein the processing system is configured to calculate the displacement according to a resolution selected from the group consisting of pixel resolution and sub-pixel resolution.

17. A method comprising:

capturing a first frame from a first substrate including a first pattern at a first time;

capturing a second frame from a second substrate including a second pattern that is substantially identical to the first pattern at a second time subsequent to the first time;

identifying the first pattern in the first frame;

identifying the second pattern in the second frame; and

calculating a displacement between the first pattern and the second pattern using the first frame and the second frame.

18. The method of claim 17 further comprising:

adjusting a position of the second substrate using the displacement.

19. The method of claim 18 wherein the second substrate includes the first substrate, and wherein the second pattern includes the first pattern.

20. The method of claim 17 further comprising:

adjusting a position of a functional unit with respect to the second substrate using the displacement.

21. The method of claim 20 wherein the second substrate includes the first substrate, and wherein the second pattern includes the first pattern.

22. The method of claim 17 further comprising:

moving the first substrate subsequent to the first time and prior to the second time.

23. A system comprising:

means for capturing a first frame from a first substrate including a first pattern at a first time;

means for capturing a second frame from a second substrate including a second pattern substantially identical to the first pattern at a second time subsequent to the first time; and

means for calculating a displacement between the first pattern and the second pattern using the first frame and the second frame.

24. The system of claim 23 further comprising:

means for adjusting a position of the second substrate using the displacement.

25. The system of claim 23 further comprising:

means for adjusting a position of a functional unit relative to the second substrate using the displacement.

26. The system of claim 23 wherein the second substrate including the first substrate, and wherein the second pattern including the first pattern.

27. The system of claim 26 wherein the first substrate is moved relative to the means for capturing the first frame subsequent to the first time and prior to the second time.

28. The system of claim 26 wherein the first substrate is removed from the system entirely subsequent to the first time and replaced in the system prior to the second time.

29. The system of claim 23 wherein the first substrate is removed from the system entirely subsequent to the first time, and wherein the second substrate is placed in the system prior to the second time.

30. The system of claim 23 wherein the first frame comprises a reference frame, and wherein the second frame comprises a comparison frame.

31. The system of claim 23 wherein the first substrate and the second substrate are each selected from the group consisting of a semiconductor wafer, paper, and a web of material.

32. The system of claim 23 wherein the first pattern and the second pattern each comprise a man-made pattern.

33. The system of claim 23 wherein the first pattern naturally occurs on the first substrate, and wherein the second pattern naturally occurs on the second substrate.

34. A computer-readable medium having computer-executable instructions for performing a method of calculating a displacement, comprising:

receiving a first frame including a first pattern embodied in a first substrate;

receiving a second frame including a second pattern substantially identical to the first pattern and embodied in a second substrate;

identifying the first pattern in the first frame;

identifying the second pattern in the second frame; and

calculating the displacement between the first pattern and the second pattern using the first frame and the second frame.

35. The computer-readable medium of claim 34 wherein the computer-readable medium has computer-executable instructions for:

providing the displacement to an adjustment system that is configured to adjust a position of the second substrate using the displacement.

36. The computer-readable medium of claim 34 wherein the computer-readable medium has computer-executable instructions for:

providing the displacement to a position adjustment system configured to adjust a position of a functional unit with respect to the second substrate using the displacement.

37. The computer-readable medium of claim 34 wherein first substrate includes the second substrate, and wherein the first pattern includes the second pattern.