KR101966655B1 - 광학 흐름 분석을 이용한 차량 충돌 경보 금지 방법 - Google Patents
광학 흐름 분석을 이용한 차량 충돌 경보 금지 방법 Download PDFInfo
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- KR101966655B1 KR101966655B1 KR1020160126243A KR20160126243A KR101966655B1 KR 101966655 B1 KR101966655 B1 KR 101966655B1 KR 1020160126243 A KR1020160126243 A KR 1020160126243A KR 20160126243 A KR20160126243 A KR 20160126243A KR 101966655 B1 KR101966655 B1 KR 101966655B1
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Abstract
본 발명의 광학 흐름 분석을 이용한 차량 충돌 경보 금지 방법은, (a) 차량에 장착되는 영상 인식 모듈로부터 차량의 전방 영상 및 영상 인식 정보를 추출하여 상기 전방 영상의 프레임마다 상기 영상 인식 정보에 포함된 전방 물체의 크기 변화율을 검출하는 광학 흐름 변화율 검출 단계; (b) 현재 시점을 기준으로 소정 프레임 구간의 상기 광학 흐름 변화율 평균값을 연산하는 평균 광학 흐름 변화율 연산 단계; (c) 현재 광학 흐름 변화율에서 상기 평균 광학 흐름 변화율을 감산한 값이 미리 정해진 임계값 미만인지를 판단하는 단계; (d) 상기 단계(c)에서 임계값 미만으로 판단되면 브레이크 조작 신호로 결정하는 단계; (e) 상기 단계(d) 이후 소정 시간 내에 충돌 경보 신호가 발생하는지를 판단하는 단계; 및 (f) 상기 단계(e)에서 충돌 경보 신호가 발생하면 해당 충돌 경보 신호의 출력을 금지시키는 단계를 포함한다.
Description
도 2는 본 발명에 따른 차량 충돌 경보 금지 방법을 예시한 흐름도,
도 3 내지 5는 본 발명에서 광학 흐름 변화율 검출 과정을 예시한 도면,
도 6은 본 발명에서 광학 흐름 변화율 값을 예시한 도면,
도 7은 본 발명에서 차량 진행방향 가속도 신호를 얻는 과정을 예시한 도면,
도 8은 저주파 통과 필터 적용 전 가속도 신호의 파형을 보인 파형도, 및
도 9는 저주파 통과 필터 적용 후 가속도 신호의 파형을 보인 파형도이다.
120 : 가속도 센서 130 : 저주파 통과 필터
140 : 적분 가속도 연산부 150 : 경보 억제부
200 : 차량 210 : 카메라 모듈
220 : 영상 인식 모듈 230 : 차량 충돌 경보 장치
240 : 알람 처리부 250 : 디스플레이 수단
260 : 스피커 300 : 지면
Claims (6)
- (a) 차량에 장착되는 영상 인식 모듈로부터 차량의 전방 영상 및 영상 인식 정보를 추출하여 상기 전방 영상의 프레임마다 상기 영상 인식 정보에 포함된 전방 물체의 크기 변화율을 검출하는 광학 흐름 변화율 검출 단계;
(b) 현재 시점을 기준으로 소정 프레임 구간의 상기 광학 흐름 변화율 평균값을 연산하는 평균 광학 흐름 변화율 연산 단계;
(c) 현재 광학 흐름 변화율에서 상기 평균 광학 흐름 변화율을 감산한 값이 미리 정해진 임계값 미만인지를 판단하는 단계;
(d) 상기 단계(c)에서 임계값 미만으로 판단되면 브레이크 조작 신호로 결정하는 단계;
(e) 상기 단계(d) 이후 소정 시간 내에 충돌 경보 신호가 발생하는지를 판단하는 단계; 및
(f) 상기 단계(e)에서 충돌 경보 신호가 발생하면 해당 충돌 경보 신호의 출력을 금지시키는 단계
를 포함하며,
상기 현재 광학 흐름 변화율은 아래의 수식(1)에 의해 산출되며, 상기 평균 광학 흐름 변화율은 아래의 수식(2)에 의해 산출되는 광학 흐름 분석을 이용한 차량 충돌 경보 금지 방법.
수식(1)
수식(2)
여기서, 는 상기 전방 물체의 크기 정보를 포함하는 현재 프레임의 광학 흐름 값이고, 는 상기 전방 물체의 크기 정보를 포함하는 이전 프레임의 광학 흐름 값이다.
- 삭제
- 제1항에 있어서,
상기 단계(c) 이후에,
(c-1) 가속도 센서로부터 차량의 진행방향 가속도 신호를 수신하는 단계;
(c-2) 수신된 가속도 신호를 적분하여 적분 가속도를 연산하는 단계; 및
(c-3) 상기 단계(c-2)에서 연산된 상기 적분 가속도가 미리 정해진 임계값 미만인지를 판단하는 단계를 더 포함하며,
상기 단계(d)는 상기 단계(c-3)에서 상기 적분 가속도가 상기 임계값 미만으로 판단될 경우 브레이크 조작 신호로 결정하는 광학 흐름 분석을 이용한 차량 충돌 경보 금지 방법.
- 제3항에 있어서,
상기 단계(c-1) 이후에 저주파 통과 필터(Low Pass Filter)를 이용하여 수신된 가속도 신호의 노이즈를 제거하는 노이즈 제거 단계를 더 포함하는 광학 흐름 분석을 이용한 차량 충돌 경보 금지 방법.
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