Title:
DIRT DETECTION METHOD FOR COVER GLASS OF CAMERA, AND DETECTION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2023/005058
Kind Code:
A1
Abstract:
A dirt detection method for cover glass of a camera. The method comprises: acquiring a first normal frame grayscale value, a first detection frame grayscale value and a background grayscale image ratio of a target object by means of a camera which has reference cover glass; acquiring a second normal frame grayscale value, a second detection frame grayscale value and a detection grayscale image ratio of the target object by means of a camera which has cover glass to be subjected to detection; and acquiring a grayscale ratio, determining, according to a comparison result of the grayscale ratio and a dirt threshold, whether a pixel point is a dirty pixel point, and according to the number of dirty pixel points, determining whether the cover glass to be subjected to detection is in a dirty state. By means of the method, the accuracy and precision of a detection result of a dirty state of cover glass are improved. Further provided is a detection apparatus. The apparatus comprises a laser apparatus, an imaging sensor and a processing module. By means of the apparatus, the detection accuracy of dirt of cover glass of a camera is improved.
Inventors:
YIN RUI (CN)
XU MIN (CN)
ZHANG WEI (CN)
JIN JIAN (CN)
XU MIN (CN)
ZHANG WEI (CN)
JIN JIAN (CN)
Application Number:
PCT/CN2021/130124
Publication Date:
February 02, 2023
Filing Date:
November 11, 2021
Export Citation:
Assignee:
SHANGHAI INTEGRATED CIRCUIT MFG INNOVATION CENTER CO LTD (CN)
International Classes:
G06T7/00; G01S7/497; G01S17/894; H04N17/00
Foreign References:
| CN113554637A | 2021-10-26 | |||
| CN112702488A | 2021-04-23 | |||
| CN112672017A | 2021-04-16 | |||
| US20190377072A1 | 2019-12-12 |
Attorney, Agent or Firm:
SHANGHAI IFUTURE INTELLECTUAL PROPERTY LAW FIRM (CN)
Download PDF: