Device and method for sensing an object and use of the device and method for adjusting an element

• US 6,775,606 B1
• Filed: 05/27/2003
• Issued: 08/10/2004
• Est. Priority Date: 12/07/2000
• Status: Expired due to Fees

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Siemens AG
• Inventors: Ertl, Ludwig, Köhler, Thorsten, Voltz, Stephan
• Primary Examiner(s): Marc-Coleman, Marthe Y.
• Application Number:
  US10/445,060
• Time in Patent Office: 441 Days
• Field of Search: 701/49, 701/45, 340/426.26, 340/457, 348/148, 348/143, 348/169, 180/273, 280/735, 318/467
• US Class Current: 701/49
• CPC Class Codes: B60N 2/002 Seats provided with an occupancy detection means mounted therein or thereon detection means responsive to presence or absence of children B60N2/266
• CPC Class Codes: B60N 2/0028 of a body part, e.g. of an arm or a leg
• CPC Class Codes: B60N 2/0272 using sensors or detectors for detecting the position of seat parts
• CPC Class Codes: B60N 2210/24 Cameras
• CPC Class Codes: B60R 21/01516 using force or pressure sensing means
• CPC Class Codes: B60R 21/0153 using field detection presence sensors
• CPC Class Codes: B60R 21/01538 for image processing, e.g. cameras or sensor arrays

Abstract

In the interior of a vehicle markings (10, 13) are positioned on vehicle elements (2, 8, 7, 19) that are detected by a stereo camera (1). Said markings are configured as reflectors or as light emitters. The stereo camera (1) detects brightness differences between the respective marking and the immediate surroundings of the marking and detects the position of the marking. An evaluation unit (110) mounted downstream of the stereo camera (1) calculates the surface structure of the respective vehicle element on the basis of the predetermined dimensions of the vehicle elements.

Claims

1. A device for sensing an object in a vehicle for occupant detection, comprising:

at least one optical marking which is provided on at least one element disposed on or in the vehicle;

a camera being disposed in the vehicle and sensing the markings; and

an evaluation unit connected downstream of the camera and determining a position of the markings,

the evaluation unit determining the surface shape of the at least one element from the position of at least one marking and the predefined dimension of the element.

2. The device according to claim 1, wherein the camera acquires spatial information about the image area to be captured and is preferably implemented as a stereo camera with two image sensors whose optical axes are spaced a predefined distance apart.

3. The device according to claim 1, wherein the evaluation unit determines a position of an element in the vehicle interior from the position of the markings.

4. The device according to claim 1, wherein the element is moveable in relation to the vehicle.

5. The device according to claim 1, wherein the element is fixed in relation to the vehicle.

6. The device according to claim 1, wherein the element is implemented as at least one of a dashboard, a window and a lining of the vehicle roof, a vehicle floor, a vehicle seat, a backrest of the vehicle seat, a seat base of the vehicle seat, a child seat, a head restraint, an internal rear-view mirror, an external rear-view mirror, a seatbelt and a window glass.

7. The device according to claim 1, wherein the marking or markings are disposed on a side of the relevant element.

8. The device according to claim 7, wherein the evaluation unit determines a contour of the surface of the vehicle seat from the position of the marking or markings on the vehicle seat.

9. The device according to claim 1, wherein at least one of the markings has a predefined geometrical shape.

10. The device according to claim 1, wherein at least one of the markings is implemented punctually and/or lineally and/or areally.

11. The device according to claim 1, wherein at least one of the markings exhibits a characteristic shape which is at least one of a group of punctual, lineal and areal markings.

12. The device according to claim 1, wherein at least one of the markings is implemented as a reflector, where the reflector is one of a flat mirror, triple mirror or spherical mirror.

13. The device according to claim 1, wherein at least one of the markings is implemented as an opto-transmitter, where the opto-transmitter is one of an electroluminescence foil, LED, gas discharge lamp or laser diode.

14. The device according to claim 13, wherein the opto-transmitter is encoded by emission of a predefined signal sequence.

15. The device according to claim 14, wherein the signal sequence of the opto-transmitter includes digital signals which are synchronized with an image capture rate of the camera.

16. The device according to claim 1, wherein the camera is disposed on a lining of the vehicle roof.

17. The device according to claim 1, further comprising a light source which illuminates the image area to be captured the camera.

18. The device according to claim 17, wherein the light source is incorporated in the camera.

19. The device according to claim 1, wherein

markings are disposed on the seat base and on the surface of the seat back,

the markings are sensed by the camera, and

the evaluation unit determines the occupancy of the vehicle seat depending on the covering of the markings.

20. The device according to claim 19, wherein the evaluation unit recognizes occupancy of the vehicle seat with a child seat and its position on the vehicle seat depending on the detected markings on the child seat.

21. The device according to claim 1, wherein the evaluation unit determines the spatial position of the elements.

22. The device according to claim 1, wherein the camera acquires gray-scale values of the image area to be captured.

23. A method for sensing an object in a vehicle for occupant detection, comprising:

a camera detects at least one optical marking which is provided on at least one element which is disposed in or on the vehicle; and

an evaluation unit connected downstream of the camera, which determines the position of at least one marking, wherein

the evaluation unit determines a surface shape of the element from the position of at least one marking and the predefined dimension of the element.

24. The method according to claim 23, wherein

the camera acquires spatial information of an image to be captured, and

the evaluation unit connected downstream of the camera determines the position of at least one element from the spatial position of at least one marking.

25. The method according to claim 23, wherein

the camera acquires gray-scale values of the image to be captured, and

the gray-scale values of at least one marking sensed by the camera are different from the gray-scale values in the immediate vicinity of the marking, the gray-scale values of the detected marking being at least twice as bright as those in the immediate vicinity of the marking.

26. The method according to claim 23, wherein

light from a light source in at least one of the vehicle and of the ambient lighting illuminates the image area to be captured,

the marking reflects the light to the camera, and

the reflected light is brighter than the light reflected from the area around the marking.

27. A device for sensing an object in a vehicle for occupant detection for adjusting an element, comprising:

a camera to sense at least one marking on at least one of an interior rear-view mirror, exterior rear-view mirror and a head restraint; and

an evaluation unit to determines the current adjustment position of the relevant rear-view mirror, wherein

the evaluation unit detects a current position of an occupant'"'"'s head and adjusts the relevant rear-view mirror or the head restraint according to the position of the head.

28. A device for sensing an object in a vehicle for occupant detection for protecting an object from becoming trapped in an adjustable window glass, comprising:

at least one marking disposed on at least one of an adjustable window glass and a marking incorporated in the window glass; and

a position of the window glass is determined from the position of at least one marking.

29. The device according to claim 28, wherein an object in a vicinity of at least one of a hazard area and a hazard area between the window glass and a window frame enclosing the window glass is detected by the evaluation unit by at least one of the markings and/or part of the marking in question being covered by the object, the object being analyzed by the evaluation unit,

the object being recognized by the image processing algorithm in the evaluation unit, and

the closing operation of the window glass being controlled as a function of the position of the object and the position of a top edge of the window glass.

30. The device according to claim 29, wherein the object is one of an occupant'"'"'s head, neck, arm, hand and/or fingers.