Research on advanced inspection of highways

Summary

As an application example of "Pixel-wise Deblurring Imaging" which we are developing in this laboratory, we propose alternative method of advanced inspection in maintenance and management of infrastructure. In camera shooting, motion blur is one of the main factors leading to image quality degradation. Efforts to improve this motion blur have been tackled by various methods such as shake correction function, flash, exposure time limiting, and contribution to image quality improvement. However, there are situations in which it is difficult to stop the infrastructure function itself, especially when inspecting the infrastructure for maintenance purposes, so it is required to photograph structures etc. while moving on the infrastructure at high speed. Furthermore, because high precision image determination is required for inspection purposes, it is extremely difficult to photograph a high resolution image without motion blur. Therefore, in this research, we propose a method to improve the above problem by using motion-blur compensation system.

This work was conducted by a joint research project between Ishikawa Watanabe Laboratory and Central Nippon co., ltd.

In order to apply the motion-blur compensation system to infrastructure maintenance and management, after reviewing the required specifications, we are conducting verification for practical application of motion-blur compensation technology through field experiments several times. As a result, we realized removal of motion blur that meets the required specifications under conditions to imaging from a moving object with a speed of 100 km/h to the ceiling height of 7 m from the ground in actual tunnel.

References

1. Tomohiko Hayakawa, Masatoshi Ishikawa, and Hiroyuki Kameoka: High-resolution deformation detection method for Tunnel lining concrete at 100 km / h, Construction Mechanization, vol.73, no.8, pp.19-23 (2021)
2. Tomohiko Hayakawa, Yushi Moko, Himari Tochioka, Masatoshi Ishikawa, Yoshimasa Ohnishi, and Hiroyuki Kameoka: [Minister's Award] High-resolution deformation detection method for lining concrete at 100 km / h, Journal of Civil Engineering, vol.62, no.7, p.146 (2021)
3. Tomohiko Hayakawa, Yuki Kubota, Yushi Moko, Yushan Ke, and Masatoshi Ishikawa: High-speed Imaging Technology Using Motion-blur Compensation for Infrastructure Inspection, Japanese Journal of Optics, Vol. 50, No. 2, pp. 61-67 (2021)
4. Tomohiko Hayakawa, Yushi Moko, Kenta Morishita, and Masatoshi Ishikawa: Real-time Robust Lane Detection Method at a Speed of 100 km/h for a Vehicle-mounted Tunnel Surface Inspection System, 2019 IEEE Sensors Applications Symposium (SAS2019) (Sophia Antipolis, 2019.3.11)
5. Tomohiko Hayakawa, Yushi Moko, Kenta Morishita, and Masatoshi Ishikawa: Real-time Robust Lane Detection Method at a Speed of 100 km/h for a Vehicle-mounted Tunnel Surface Inspection System, 16th ITS Symposium (Kyoto, 2018.12.14), 4-B-01, 2018. Best Poster Award
6. Tomohiko Hayakawa, Yushi Moko, Kenta Morishita, and Masatoshi Ishikawa, "Pixel-Wise Deblurring Imaging System Based on Active Vision for Structural Health Monitoring at a Speed of 100 km/h," 2017 The 10th International Conference on Machine Vision (Vienna, Austria, 2017.11.14)/ (Oral Session)
7. Tomohiko Hayakawa and Masatoshi Ishikawa, "Motion-blur-compensated structural health monitoring system for tunnels at a speed of 100 km/h," SPIE Smart Structures/NDE 2017(Portland, Oregon, USA. 2017.03.29)/ (Oral Session)
8. Tomohiko Hayakawa and Masatoshi Ishikawa: Development of Motion-Blur-Compensated High-Speed Moving Visual Inspection Vehicle for Tunnels, Int. J. Struct. Civ. Eng. Res., Vol. 5, No. 2, pp. 151-155, 2016.
9. Tomohiko Hayakawa and Masatoshi Ishikawa, "Motion-blur-compensated structural health monitoring system for tunnels using pre-emphasis technique," Fifth International Symposium on Life -Cycle Civil Engineering, IALCCE2016(Delft, The Netherlands, 2016.10.16-19)
10. Tomohiko Hayakawa and Masatoshi Ishikawa: Development of Motion-Blur-Compensated High-Speed Moving Visual Inspection Vehicle for Tunnels (ICGCE'16) (Penang, 2016.1.13) / Proceedings of 2016 3rd International Conference on Geological and Civil Engineering, pp. 24-28 (2016) Best Presentation Award