Title:
FRINGE PROJECTION THREE-DIMENSIONAL MEASUREMENT METHOD APPLICABLE TO DETECTION OF HIGH-REFLECTIVE FOREIGN OBJECT IN TRANSMISSION OF COAL MINE BELT CONVEYOR
Document Type and Number:
WIPO Patent Application WO/2024/082661
Kind Code:
A1
Abstract:
A fringe projection three-dimensional measurement method applicable to detection of a high-reflective foreign object (2) in transmission of a coal mine belt conveyor (6), comprising the following steps: projecting two grayscale images onto the surface of a foreign object (2), a camera acquiring an image, calculating ambient light intensity and surface reflectivity, and further calculating adaptive projection intensity in a camera coordinate system; projecting a speckle image, optimizing an acquired speckle image according to the reflectivity, and establishing a pixel matching relationship between the projection and the acquired image; according to the pixel matching relationship, enabling the adaptive projection intensity in the camera coordinate system to correspond to that in a projector coordinate system, further generating an adaptive projection fringe pattern, projecting same onto the surface of the foreign object (2), and measuring three-dimensional information of the foreign object (2); and detecting the foreign object (2) on the surface of a belt conveyor (6) according to the three-dimensional information. The present invention avoids the problem of a measurement failure during measurement of high-reflective objects by using conventional fringe projection three-dimensional measurement methods, and is applicable to measurement of metal foreign objects (2) such as an anchor rod and an iron wire mesh on the surface of the belt conveyor (6).
Inventors:
XU SHAOYI (CN)
FENG TINGYU (CN)
ZHOU GONGBO (CN)
ZHU ZHENCAI (CN)
LI WEI (CN)
WANG CHENGTAO (CN)
XING FANGFANG (CN)
YU XIANLANG (CN)
SUN TIANSHAN (CN)
CHEN YINGXIN (CN)
FAN JUNZHAN (CN)
FENG TINGYU (CN)
ZHOU GONGBO (CN)
ZHU ZHENCAI (CN)
LI WEI (CN)
WANG CHENGTAO (CN)
XING FANGFANG (CN)
YU XIANLANG (CN)
SUN TIANSHAN (CN)
CHEN YINGXIN (CN)
FAN JUNZHAN (CN)
Application Number:
PCT/CN2023/100611
Publication Date:
April 25, 2024
Filing Date:
June 16, 2023
Export Citation:
Assignee:
CHINA UNIV OF MINING AND TECHNOLOGY (CN)
International Classes:
G01B11/25; G06T7/00
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
Download PDF: