# US 2013/0154815 A1 · System and method of providing warning to pedestrian using laser beam

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2013/0154815 A1
- Document ID: US20130154815A1
- Status: Published application
- Kind: A1
- Application number: 13/556,759
- Filed: 2012-07-24
- Published: 2013-06-20
- Earliest claimed: 2011-12-14
- Assignees: Hyundai Motor Company
- Inventors: Kyoung Moo Min; Kyung Ho Yoo; Yoon Ho Jang; Seong Su Im; Hui Sung Lee; Jin Hak Kim; Eun Jin Choi
- Web page: https://patentgrep.com/patent/US20130154815A1

## CPC

- B60Q 1/085: {due to special conditions, e.g. adverse weather, type of road, badly illuminated road signs or potential dangers (B60Q1/10, B60Q1/12, B60Q1/1423 take precedence)}
- B60Q 1/18: being additional front lights {(bracket mounted headlights B60Q1/0483)}
- B60Q 2300/45: Special conditions, e.g. pedestrians, road signs or potential dangers
- B60Q 2400/50: Projected symbol or information, e.g. onto the road or car body
- B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL

## Abstract

Disclosed herein is a system and method of providing a warning to a pedestrian using a laser beam. In particular, objects present in a detection area of a front impact sensor provided on a vehicle are detected. A movement path vector of a first moving object that is moving in a direction identical to that of the vehicle, among the objects present in the detection area, is generated. When the movement path vector of the first moving object falls within an error range of a movement vector of the vehicle, the first moving object is designated as belonging to a group of laser warning target candidates, and thereafter an emission angle of a laser beam is generated. The laser beam is emitted through a laser light based on the emission angle of the laser beam.

## Claims

### Claim 1

A method of providing a warning to a pedestrian using a laser beam, comprising:
detecting, by a sensor, objects present in a detection area of a front impact sensor provided on a vehicle;
generating, by a control unit, a movement path vector of a first moving object that is moving in a direction identical to that of the vehicle among the objects present in the detection area;
in response to the movement path vector of the first moving object falling within an error range of a movement vector of the vehicle, designating, by the control unit, the first moving object as belonging to a group of laser warning target candidates, and thereafter generating an emission angle of a laser beam; and
emitting the laser beam through a laser light based on the generated emission angle of the laser beam.

### Claim 2 (depends on 1)

The method according to claim 1, wherein among the objects present in the detection area, a fixed object and a second moving object moving in a direction different from that of the vehicle are designated as belonging to a group of laser warning exception candidates.

### Claim 3 (depends on 1)

The method according to claim 1, wherein:
when the movement path vector of the first moving object falls within a range of ±10° of the movement vector of the vehicle, the first moving object is designated as belonging to the group of laser warning target candidates; and
when the movement path vector of the first moving object falls outside the range of ±10°, the first moving object is designated as belonging to a group of laser warning exception candidates.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the laser beam emitted through the laser light is projected onto a ground surface located ahead of the first moving object in a direction in which the first moving object is moving.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the emission angle of the laser beam is generated by the following equations (1) and (2):
θ1=tan(Y1+Y2)/(X1+X2)) (1)
θ2=tan(H1)/(X1+X2)) (2)
where θ1 denotes an angle of lateral rotation of the laser light, θ2 denotes an angle of vertical rotation of the laser light, X1 denotes an interval between the front impact sensor and the first moving object, X2 denotes an interval between the first moving object and a location onto which the laser beam is projected, H1 denotes a height from the ground surface to the laser light, Y1 denotes an interval between a center of a front of the vehicle and a center of the first moving object, and Y2 denotes an interval between the center of the front of the vehicle and the laser light.

### Claim 6 (depends on 1)

The method according to claim 1, further comprising:
generating a movement path vector of the new moving object when a new moving object other than the first moving object designated as belonging to the group of laser warning target candidates is present in the detection area;
designating the new moving object as belonging to the group of laser warning target candidates when the movement path vector of the new moving object falls within the error range of the movement vector of the vehicle; and
designating the new moving object as belonging to a group of laser warning exception candidates when the movement path vector of the new moving object does not fall within the error range of the movement vector of the vehicle.

### Claim 7 (depends on 6)

The method according to claim 6, wherein:
when the movement path vector of the new moving object falls within a range of ±10° of the movement vector of the vehicle, the new moving object is designated as belonging to the group of laser warning target candidates; and
when the movement path vector of the new moving object falls outside the range of ±10°, the new moving object is designated as belonging to the group of laser warning exception candidates.

### Claim 8

A non-transitory computer readable medium containing program instructions executed by a processor or controller, the computer readable medium comprising:
program instructions that detect objects present in a detection area of a front impact sensor provided on a vehicle;
program instructions that generate a movement path vector of a first moving object that is moving in a direction identical to that of the vehicle among the objects present in the detection area;
program instructions that designate the first moving object as belonging to a group of laser warning target candidates, and thereafter generating an emission angle of a laser beam in response to the movement path vector of the first moving object falling within an error range of a movement vector of the vehicle; and
program instructions that emit the laser beam through a laser light based on the generated emission angle of the laser beam.

### Claim 9 (depends on 8)

The non-transitory computer readable medium according to claim 8, wherein among the objects present in the detection area, a fixed object and a second moving object moving in a direction different from that of the vehicle are designated as belonging to a group of laser warning exception candidates.

### Claim 10 (depends on 8)

The non-transitory computer readable medium according to claim 8, wherein:
when the movement path vector of the first moving object falls within a range of ±10° of the movement vector of the vehicle, the first moving object is designated as belonging to the group of laser warning target candidates; and
when the movement path vector of the first moving object falls outside the range of ±10°, the first moving object is designated as belonging to a group of laser warning exception candidates.

### Claim 11 (depends on 8)

The non-transitory computer readable medium according to claim 8, wherein the laser beam emitted through the laser light is projected onto a ground surface located ahead of the first moving object in a direction in which the first moving object is moving.

### Claim 12 (depends on 11)

The non-transitory computer readable medium according to claim 11, wherein the emission angle of the laser beam is generated by the following equations (1) and (2):
θ1=tan(Y1+Y2)/(X1+X2)) (1)
θ2=tan(H1)/(X1+X2)) (2)
where θ1 denotes an angle of lateral rotation of the laser light, θ2 denotes an angle of vertical rotation of the laser light, X1 denotes an interval between the front impact sensor and the first moving object, X2 denotes an interval between the first moving object and a location onto which the laser beam is projected, H1 denotes a height from the ground surface to the laser light, Y1 denotes an interval between a center of a front of the vehicle and a center of the first moving object, and Y2 denotes an interval between the center of the front of the vehicle and the laser light.

### Claim 13 (depends on 8)

The non-transitory computer readable medium according to claim 8, further comprising:
program instructions that generate a movement path vector of the new moving object when a new moving object other than the first moving object designated as belonging to the group of laser warning target candidates is present in the detection area;
program instructions that designate the new moving object as belonging to the group of laser warning target candidates when the movement path vector of the new moving object falls within the error range of the movement vector of the vehicle; and
program instructions that designate the new moving object as belonging to a group of laser warning exception candidates when the movement path vector of the new moving object does not fall within the error range of the movement vector of the vehicle.

### Claim 14 (depends on 13)

The non-transitory computer readable medium according to claim 13, wherein:
when the movement path vector of the new moving object falls within a range of ±10° of the movement vector of the vehicle, the new moving object is designated as belonging to the group of laser warning target candidates; and
when the movement path vector of the new moving object falls outside the range of ±10°, the new moving object is designated as belonging to the group of laser warning exception candidates.

### Claim 15

A system of providing a warning to a pedestrian using a laser beam, comprising:
a sensor mounted in a front portion of a vehicle configured to detect objects present in a detection area of a front impact sensor provided on a vehicle;
a control unit configured to generate a movement path vector of a first moving object that is moving in a direction identical to that of the vehicle among the objects present in the detection area, designate the first moving object as belonging to a group of laser warning target candidates in response to the movement path vector of the first moving object falling within an error range of a movement vector of the vehicle and thereafter generate an emission angle of a laser beam; and
a laser light configured to emit the laser beam based on the generated emission angle of the laser beam.