Sub-frame timestamping of a camera network using a coded light signal

被引：0

作者：

Han, Yunhyeok ^{[1
]}

Lo Feudo, Stefania ^{[1
]}

Cumunel, Gwendal ^{[2
]}

Renaud, Franck ^{[1
]}

机构：

[1] ISAE Supmeca, Quartz Lab EA7393, 3 Rue Fernand Hainaut, F-93400 St Ouen, France

[2] Gustave Eiffel Univ, CNRS, ENPC, Lab Navier, F-77455 Marne La Vallee, France

来源：

MEASUREMENT | 2024年 / 236卷

关键词：

Camera network; Computer vision; Image processing; Frame timestamp reconstruction; Uncertainty characterization; SYSTEM;

D O I：

10.1016/j.measurement.2024.115046

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To extract the 3D displacements of structures using a camera network, it is essential to know the frame timestamps. However, technical constraints in outdoor conditions can make synchronous frame acquisition impossible. This study aims to reconstruct the timestamps of frames during post-processing to employ cameras without special camera feature. To achieve this, a LED panel that emits a coded light signal is placed in the field of view common to all cameras. The pixel intensity of the LED region in the sequential images is processed to reconstruct each frame's timestamp. The uncertainty of the timestamp reconstruction is numerically estimated to encode the light signal. Validation was conducted through indoor experiments and outdoor applications to monitor a tower crane. The uncertainty of the obtained timestamp is 1.65% of the frame interval under uncontrolled conditions. The proposed method can be used with cameras, even when synchronization is unattainable.

引用

页数：13