To track living organisms, methods have been used such as spraying substances that easily produce phosphorescence or preparation at the genetic level; however, the need for advance preparation. Alternatively, it has become clear that RTP can be produced by excitation of organic materials with ultraviolet light. Since living organisms are composed of organic materials, phosphorescence is presumed to be generated. In this study, we will test this hypothesis and investigate its application to novel bioimaging without any preparation. Specifically, using a stuffed sparrow, we irradiate 375 nm excitation light to the feather area and take images using a high-speed, high-sensitivity camera. By measuring the phosphorescence lifetime after the end of the excitation light, we will track the phosphorescence that can be used for position tracking. In the experiment, the excitation light was actually irradiated on a stuffed sparrow, and the phosphorescene light as a label-free dynamic marker was tracked.
In this study, we developed a lane detection and motion-blur compensation system for curved tunnel inspection by combining elements from art discipline (silk printing), and a camera, aiming to improve the accuracy of the self-positioning method in tunnel. We proposed an accurate and convenient printing method that is based on silkscreen printing using retroreflective paint and developed a method for creating barcode markers that can be printed on the surface of concrete. Here, we propose an extension of the aforementioned study where different curvature angles are considered, revealing that the reading of the marker is significantly affected by the lighting and shooting conditions. The results of this recognition experiment show that the method of using such a retroreflective marker to identify the position of the surface of curved structures may be used not only for vehicle tunnels, but also for human and animal tunnels, and for narrower and more curved tubular objects.
In this study, we developed a lane detection and motion-blur compensation system for tunnel inspection. It was undertaken considering the need for a highly safe and inexpensive inspection method for highway structures to replace the conventional visual and hummer sounding inspection. To further improve the positional accuracy of deterioration detection, we 1) proposed an accurate and convenient printing method that is based on silkscreen printing using retroreflective paint and 2) developed a method for creating barcode markers that can be printed on the surface of concrete.
The infrared thermography method has been used as a non-contact and quick diagnostic technique for the measurement of deformation inside concrete structures. Measurement from the in-vehicle camera is indispensable for quick diagnosis, yet motion blur while running is the essential problem. In this study, we developed a system using the galvanometer mirror and the thermography camera for compensating this motion blur. In the indoor and outdoor experiment assuming the measurement at 40 km/h, it was confirmed that our system compensated the motion blur effectively in the infrared region and detected the delamination of concrete structures.
In this paper, we propose a pixel-wise deblurring imaging (PDI) system based on active vision for compensation of the blur caused by high-speed one-dimensional motion between a camera and a target. The optical axis is controlled by back-and-forth motion of a galvanometer mirror to compensate the motion. High-spatial-resolution image captured by our system in high-speed motion is useful for efficient and precise visual inspection, such as visually judging abnormal parts of a tunnel surface to prevent accidents; hence, we applied the PDI system for structural health monitoring. By mounting the system onto a vehicle in a tunnel, we confirmed significant improvement in image quality for submillimeter black-and-white stripes and real tunnel-surface cracks at a speed of 100 km/h.
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