公开(公告)号：US10565459B2

公开(公告)日：2020-02-18

申请号：US16011254

申请日：2018-06-18

Applicant: Reflective Measurement Systems Ltd

Inventor： James Mahon

IPC: G06K9/00 ,  G01J1/42 ,  G01N21/55 ,  E01C23/16 ,  G01J1/44 ,  H04N5/225 ,  H04N5/247 ,  H04N9/04

Abstract: A retroreflectivity measurement system comprises a light source arranged to project light across a traffic lane during a measurement run, the light being limited to a particular portion of the visible light spectrum. A camera is selectively sensitive to this light to provide first filtered images and separately selectively sensitive to light at a portion of the spectrum not including the particular portion to provide second filtered images. A controller obtains sequences of first and second filtered images during the measurement run, and identifies within the sequences of images an illuminated road marking; determines a first intensity of the marking from a first filtered image, and a further intensity of the marking from the second filtered images; estimates an ambient intensity of the marking, by applying a scaling factor to the further intensity; and determines a retroreflectivity of the marking as a function of the first and estimated ambient intensities.

公开(公告)号：US20190163992A1

公开(公告)日：2019-05-30

申请号：US16011254

申请日：2018-06-18

Applicant: Reflective Measurement Systems Ltd.

Inventor： James Mahon

IPC: G06K9/00 ,  H04N5/225 ,  H04N9/04 ,  H04N5/247 ,  G01N21/55 ,  G01J1/42 ,  G01J1/44

CPC classification number: G06K9/00798 ,  B60W30/12 ,  B60Y2400/3015 ,  E01C23/163 ,  G01J1/4204 ,  G01J1/44 ,  G01N21/55 ,  G01N2021/551 ,  G01N2201/0216 ,  G06K9/2018 ,  H04N5/2253 ,  H04N5/2256 ,  H04N5/247 ,  H04N9/04

Abstract: A retroreflectivity measurement system comprises a light source arranged to project light across a traffic lane during a measurement run, the light being limited to a particular portion of the visible light spectrum. A camera is selectively sensitive to this light to provide first filtered images and separately selectively sensitive to light at a portion of the spectrum not including the particular portion to provide second filtered images. A controller obtains sequences of first and second filtered images during the measurement run, and identifies within the sequences of images an illuminated road marking; determines a first intensity of the marking from a first filtered image, and a further intensity of the marking from the second filtered images; estimates an ambient intensity of the marking, by applying a scaling factor to the further intensity; and determines a retroreflectivity of the marking as a function of the first and estimated ambient intensities.

公开(公告)号：GB201506900D0

公开(公告)日：2015-06-10

申请号：GB201506900

申请日：2015-04-23

Applicant: REFLECTIVE MEASUREMENT SYSTEMS LTD

公开(公告)号：GB201719823D0

公开(公告)日：2018-01-10

申请号：GB201719823

申请日：2017-11-29

Applicant: REFLECTIVE MEASUREMENT SYSTEMS LTD

Abstract: A retroreflectivity measurement system (10) comprises a light source (20) arranged to continuously project light across a traffic lane during a measurement run, the light being limited to a particular portion of the visible light spectrum. A master camera (14) is selectively sensitive to this light to provide first filtered images of the illuminated portion of the traffic lane. A reference camera (18) is separately selectively sensitive to light at least at one portion of the spectrum not including the particular portion to provide second filtered images of the illuminated portion of the traffic lane. A controller (30) is arranged to: obtain sequences of first and corresponding one or more second filtered images from the cameras (14,18) during the measurement run, and identify within at least one of the sequences of images a portion of a road marking illuminated by the light source (20); determine a first intensity of the road marking from a first filtered image, and a further intensity of the road marking from the corresponding one or more second filtered images; estimate an ambient intensity of the road marking within the particular portion of the light spectrum, by applying a scaling factor to the further intensity; and determine a retroreflectivity of the road marking as a function of the first intensity and the estimated ambient intensity.

公开(公告)号：EP3492906A1

公开(公告)日：2019-06-05

申请号：EP18177107.2

申请日：2018-06-11

Applicant: Reflective Measurement Systems Ltd

Inventor： MAHON, James

IPC: G01N21/55

Abstract: A retroreflectivity measurement system (10) comprises a light source (20) arranged to continuously project light across a traffic lane during a measurement run, the light being limited to a particular portion of the visible light spectrum. A master camera (14) is selectively sensitive to this light to provide first filtered images of the illuminated portion of the traffic lane. A reference camera (18) is separately selectively sensitive to light at least at one portion of the spectrum not including the particular portion to provide second filtered images of the illuminated portion of the traffic lane. A controller (30) is arranged to: obtain sequences of first and corresponding one or more second filtered images from the cameras (14,18) during the measurement run, and identify within at least one of the sequences of images a portion of a road marking illuminated by the light source (20); determine a first intensity of the road marking from a first filtered image, and a further intensity of the road marking from the corresponding one or more second filtered images; estimate an ambient intensity of the road marking within the particular portion of the light spectrum, by applying a scaling factor to the further intensity; and determine a retroreflectivity of the road marking as a function of the first intensity and the estimated ambient intensity.