Apparatus and method of pedestrian recognition
First Claim
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1. A pedestrian recognition apparatus comprising:
- a radar unit for emitting a radar beam therefrom and receiving a reflected beam that is reflectively redirected by a reflective object when scanning of a detection area by the radar beam is performed in plural scan lines at a predetermined detection interval;
a reflective object detection unit for detecting a position of the reflective object as two-dimensional coordinates in a predetermined coordinate system based on a result of emission of the radar beam and reception of the reflected beam by the radar unit;
an object determination unit for determining whether the reflective object is a stopping object or a moving object based on a positional change of the reflective object represented by the two-dimensional coordinates in the predetermined coordinate system derived from plural times of position detection of the reflective object at the predetermined detection interval; and
a pedestrian recognition unit for recognizing a pedestrian, wherein pedestrian recognition is performed as formation of an object group of close-by reflective objects for forming an object group of the reflective objects in the two-dimensional coordinates in the predetermined coordinate system out of the reflective objects determined as the moving object based on a determination result by the object determination unit, the formation of the object group succeeded by determination of a group size of the object group based on a predetermined criterion of the group size for associating the object group with the pedestrian.
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Abstract
An apparatus having a laser radar is used to recognize a pedestrian by detecting a position of reflective objects, mapping the objects in a two-dimensional coordinate system, determining whether the objects are moving, and grouping moving objects closely located with each other. Based on a size of an object group, the pedestrian associated with the object group is accurately recognized.
34 Citations
12 Claims
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1. A pedestrian recognition apparatus comprising:
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a radar unit for emitting a radar beam therefrom and receiving a reflected beam that is reflectively redirected by a reflective object when scanning of a detection area by the radar beam is performed in plural scan lines at a predetermined detection interval; a reflective object detection unit for detecting a position of the reflective object as two-dimensional coordinates in a predetermined coordinate system based on a result of emission of the radar beam and reception of the reflected beam by the radar unit; an object determination unit for determining whether the reflective object is a stopping object or a moving object based on a positional change of the reflective object represented by the two-dimensional coordinates in the predetermined coordinate system derived from plural times of position detection of the reflective object at the predetermined detection interval; and a pedestrian recognition unit for recognizing a pedestrian, wherein pedestrian recognition is performed as formation of an object group of close-by reflective objects for forming an object group of the reflective objects in the two-dimensional coordinates in the predetermined coordinate system out of the reflective objects determined as the moving object based on a determination result by the object determination unit, the formation of the object group succeeded by determination of a group size of the object group based on a predetermined criterion of the group size for associating the object group with the pedestrian. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pedestrian recognition method comprising:
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emitting a radar beam and receiving a reflected beam that is derived as a result of reflective redirection of the radar beam by a reflective object when scanning of a detection area by the radar beam is performed in plural scan lines at a predetermined detection interval; detecting a position of the reflective object as two-dimensional coordinates in a predetermined coordinate system based on a result of emission of the radar beam and reception of the reflected beam; determining whether the reflective object is a stopping object or a moving object based on a positional change of the reflective object represented by the two-dimensional coordinates in the predetermined coordinate system as a result of plural times of scanning of the reflective object at the predetermined detection interval; and performing pedestrian recognition, wherein the pedestrian recognition is performed as formation of an object group of close-by reflective objects for forming an object group of the reflective objects in the two-dimensional coordinates of the predetermined coordinate system out of the reflective objects determined as the moving object based on a determination result that each of the reflective objects is one of the stopping object and the moving object, the formation of the object group succeeded by determination of a group size of the object group based on a predetermined criterion of the group size for associating the object group with the pedestrian. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification