IMAGE INSPECTING DEVICE AND METHOD FOR A HEAD-MOUNTED DISPLAY

• US 20080002859A1
• Filed: 06/28/2007
• Published: 01/03/2008
• Est. Priority Date: 06/29/2006
• Status: Active Grant

• Current Assignee: Himax Display Incorporated (Himax Technologies Incorporated)
• Original Assignee: Himax Display Incorporated (Himax Technologies Incorporated)
• Inventors: TSAN, Shu-Mei
• Granted Patent: US 8,170,325 B2
• Time in Patent Office: Days
• US Class Current: 382/112
• CPC Class Codes: G02B 2027/0112 comprising device for genereting colour display
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 2027/0134 of stereoscopic type
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G06T 7/001 using an image reference approach
• CPC Class Codes: G06T 7/70 Determining position or orientation of objects or cameras camera calibration G06T7/80

Abstract

An image inspecting device is adapted to inspect the difference value bet ween the locations of first and second images. The image inspecting device includes an image catching unit and a light processing unit. The light processing unit is adapted to project the first and second images on the image catching unit.

Claims

1. An image inspecting device adapted to inspect the difference value between locations of first and second images, the image inspecting device comprising:

an image catching unit; and

a light processing unit adapted to project the first and second images on the image catching unit.

2. The image inspecting device as claimed in claim 1, wherein the light processing unit comprises two beam splitting elements and a beam combining element, and the first and second images are projected on the single image catching unit through the two beam splitting elements and the beam combining element.

3. The image inspecting device as claimed in claim 2, wherein the beam splitting element is a polarizing beam splitter.

4. The image inspecting device as claimed in claim 2, wherein the beam splitting element is a beam splitter.

5. The image inspecting device as claimed in claim 2, wherein the beam combining element is an X-cube prism.

6. The image inspecting device as claimed in claim 1, wherein the light processing unit comprises a reflecting mirror and a beam combining element, the first image is projected reflected on the image catching unit through the reflecting mirror and the beam combining element, and the second image is projected on the image catching unit through the beam combining element.

7. The image inspecting device as claimed in claim 6, wherein the reflecting mirror is a polarizing beam splitter, and the beam combining element is a beam splitter.

8. The image inspecting device as claimed in claim 6, wherein the beam combining element is a polarizing beam splitter.

9. The image inspecting device as claimed in claim 6, wherein the light processing unit further comprises a brightness adjusting element, and the second image enters the beam combining element through the brightness adjusting element.

10. The image inspecting device as claimed in claim 9, wherein the brightness adjusting element is selected from the group consisting of neutral density filter, linear polarizer and half-wave plate.

11. The image inspecting device as claimed in claim 1, wherein the light processing unit comprises a beam splitting element and a beam combining element, the first image is projected reflected on the image catching unit through the beam splitting element and the beam combining element, and the second image is projected on the image catching unit through the beam combining element.

12. The image inspecting device as claimed in claim 11, wherein the beam splitting element and the beam combining element are beam splitters.

13. The image inspecting device as claimed in claim 12, wherein the ratio of transmission to reflection of the beam splitters is approximately 40 to 60.

14. The image inspecting device as claimed in claim 1, wherein the first and second images are generated by two optical engines of a head mounted display.

15. The image inspecting device as claimed in claim 14, further comprising:

two beam splitting elements for respectively splitting the first and second images generated from the two optical engines to the light processing unit and the human eyes.

16. The image inspecting device as claimed in claim 11, wherein the light processing unit further comprises a brightness adjusting element, and the second image enters the beam combining element through the brightness adjusting element.

17. The image inspecting device as claimed in claim 16, wherein the brightness adjusting element is selected from the group consisting of neutral density filter, linear polarizer and half-wave plate.

18. The image inspecting device as claimed in claim 1, wherein the first and second images are the first and second color images respectively, and the first color image is different from the second color image.

19. The image inspecting device as claimed in claim 1, wherein the first and second images are in the shape of a cross.

20. An image inspecting method comprising the following steps of:

providing a head mounted display, which includes two optical engines;

providing an image catching unit and a light processing unit;

generating first and second images by the two optical engines of the head mounted display; and

projecting the first and second images on the image catching unit through the light processing unit.

21. The image inspecting method as claimed in claim 20, further comprising the following step of:

inspecting a difference value between locations of the first and second images on the image catching unit.

22. The image inspecting method as claimed in claim 21, further comprising the following steps of:

setting the first and second images to be the first and second color images respectively, wherein the first color image is different from the second color image; and

Inspecting the difference value between color-mixing locations of the first and second images on the image catching unit.

23. The image inspecting method as claimed in claim 21, further comprising the following steps of:

setting the first and second images to be in the shape of a cross; and

Inspecting the difference value between “

cross”

-shaped locations of first and second images.

24. The image inspecting method as claimed in claim 21, further comprising the following step of:

providing another head mounted display which has been successfully calibrated, whereby a predetermined difference value between locations of the two images is set.

25. The image inspecting method as claimed in claim 24, wherein the head mounted display which has been successfully calibrated is a golden sample.

26. The image inspecting method as claimed in claim 24, further comprising the following step of:

respectively splitting the first and second images generated from the two optical engines to the light processing unit and the human eyes, whereby another predetermined difference value between locations of the two images is set.

27. The image inspecting method as claimed in claim 24, further comprising the following steps of:

setting the image inspection to be successful when the difference value between the locations of the two images is less than the predetermined difference value; and

setting the image inspection to be failed when the difference value between the locations of the two images is more than the predetermined difference value.

28. An image inspecting device adapted to inspect the difference value between locations of a real image and a preset image, the image inspecting device comprising:

an image catching unit;

a light processing unit adapted to project the real image on the image catching unit; and

a memory stored with a location of the preset image on the image catching unit.

29. The image inspecting device as claimed in claim 28, further comprising:

a microprocessor adapted to inspect the difference value between the locations of the real image and the preset image.

30. The image inspecting device as claimed in claim 28, wherein the real image is generated by an optical engine of a monocular head mounted display.

31. The image inspecting device as claimed in claim 30, wherein the light processing unit comprises a beam splitting element for splitting the real image generated from the optical engine to the image catching unit and the human eyes.

32. An image inspecting method comprising the following steps of:

providing a monocular head mounted display, which includes an optical engine;

providing an image catching unit and a light processing unit;

providing a memory, which is stored with a location of a preset image on the image catching unit;

generating a real image by the optical engine of the head mounted display;

projecting the real image on the image catching unit through the light processing unit; and

providing a microprocessor, which is adapted to inspect the difference value between the locations of the real image and the preset image on the image catching unit.

33. The image inspecting method as claimed in claim 32, further comprising the following step of:

providing another monocular head mounted display which has been successfully calibrated, thereby providing the location of the preset image on the image catching unit.

34. The image inspecting method as claimed in claim 33, further comprising the following step of:

splitting the real image generated from the optical engine to the image catching unit and the human eyes, whereby a predetermined difference value between the locations of the real image and the preset image is set.