Headlight Control Apparatus for Automobile

• US 20080084165A1
• Filed: 10/03/2007
• Published: 04/10/2008
• Est. Priority Date: 10/06/2006
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: SHIMA, Takeshi, MURAMATSU, Shoji, OTSUKA, Yuji, MONJI, Tatsuhiko
• Application Number:
  US11/866,458
• Publication Number:
  US 20080084165A1
• Time in Patent Office: Days
• US Class Current: 315/82
• CPC Class Codes: B60Q 1/0023 the element being a sensor, e.g. distance sensor, camera
• CPC Class Codes: B60Q 1/1423 Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
• CPC Class Codes: B60Q 2300/056 Special anti-blinding beams, e.g. a standard beam is chopped or moved in order not to blind
• CPC Class Codes: B60Q 2300/41 preceding vehicle
• CPC Class Codes: B60Q 2300/42 oncoming vehicle
• CPC Class Codes: F21S 41/645 by electro-optic means, e.g. liquid crystal or electrochromic devices
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source

Abstract

The present invention provides a headlight control apparatus which suppresses a feeling of strangeness given to a driver of an own vehicle by hunting due to reflector light while preventing a preceding vehicle and an on-coming vehicle from being dazzled, based on a video image obtained by a camera. The headlight is controlled by detecting the position of a light spot in the image captured by the camera to perform irradiation with a pattern which reduces the light quantity of a certain area above the detected light spot. Thereby, even if hunting occurs due to the reflector light, the irradiation light quantity of an entire irradiation area of the headlight does not vary, but only the irradiation light quantity for a partial area above a reflector varies, and therefore, the feeling of strangeness given to the driver can be suppressed.

Claims

1. A headlight control apparatus, comprising:

a headlight which irradiates a front direction of a vehicle, the light quantity in each partial area in an irradiation range of the headlight being controllable independently of another partial area;

a camera which is mounted on the vehicle to capture an image in the front direction of the vehicle; and

a control unit which detects the position of a light spot in the image inputted from the camera, and controls an irradiation pattern of the headlight based on the position of the light spot, wherein

the control unit controls the headlight so as to reduce the light quantity in a certain area above the position of the detected light spot.

3. The headlight control apparatus according to claim 1, wherein the size of the area in which the light quantity is reduced varies depending on the size of the light spot.

4. The headlight control apparatus according to claim 1, wherein the size of the area in which the light quantity is reduced varies depending on the luminance of the light spot.

5. The headlight control apparatus according to claim 1, wherein the size of the area in which the light quantity is reduced varies depending on the color of the light spot area.

6. The headlight control apparatus according to claim 1, wherein the size of the area in which the light quantity is reduced varies depending on the distance to the light spot area.

7. The headlight control apparatus according to claim 1, wherein the camera is located inside the headlight unit.

8. The headlight control apparatus according to claim 7, wherein an optical axis of the headlight and an optical axis of the camera are parallel with each other.

15. The headlight control apparatus according to claim 1, wherein the headlight is constituted of a light source, a condenser lens part, a liquid crystal part, and a light projecting part.

16. The headlight control apparatus according to claim 15, wherein the headlight is constituted of LEDs in an array form.

2. A headlight control apparatus, comprising:

a headlight which irradiates a front direction of a vehicle, the light quantity in each partial area in an irradiation range of the headlight being controllable independently of another partial area;

a camera which is mounted on the vehicle to capture an image in the front direction of the vehicle;

an image processing part which detects the position of a light spot in the image inputted from the camera, and generates an irradiation pattern of the headlight based on the position of the light spot; and

a headlight control part which receives an input of the irradiation pattern from the image processing part, and controls irradiation of the headlight based on the irradiation pattern, wherein

the image processing part generates the irradiation pattern which reduces the light quantity in a certain area above the position of the detected light spot.

9. The headlight control apparatus according to claim 2, wherein the image processing part transfers light distribution pattern video image information to the headlight control part.

10. The headlight control apparatus according to claim 9, wherein the video image information is an NTSC signal.

11. The headlight control apparatus according to claim 9, wherein the video image information is a PAL signal.

12. The headlight control apparatus according to claim 9, wherein the video image information is an analogue RGB signal.

13. The headlight control apparatus according to claim 9, wherein the video image information is of the Camera Link standard.

14. The headlight control apparatus according to claim 9, wherein the video image information is of the IEEE1394 standard.