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Imaging of hydrogen gas concentrations were demonstrated using arrayed sensors system in the cylindrical diffusion tank-shaped simulator. The field effect transistor type hydrogen sensors with platinum gate electrode were used. The sensitivity of the sensors was around -34.1 mV/dec. and the response time was 1.2 sec. in average. By applying a sensor drive circuit to each sensor, the diffusion processes...
This paper presents a highly accurate and efficient method for crack detection using percolation-based image processing. The detection of cracks in concrete surfaces during the maintenance and diagnosis of concrete structures is important to ensure the safety of these structures. Recently, the image-based crack detection method has attracted considerable attention due to its low cost and objectivity...
Crack detection on concrete surfaces is the most popular subject in the inspection of the concrete structures. The conventional method of crack detection is performed by experienced human inspectors by sketching the crack patterns manually. Some automated crack detection techniques utilizing image processing have been proposed. Although most of the image-based approaches pay attention to the accuracy...
We introduced discrete wavelet transform (DWT) to vector quantization (VQ) for image compression. DWT is multi-resolution analysis, and a signal energy concentrates to specific DWT coefficients. This characteristics is useful for image compression. DWT coefficients are compressed using VQ with variable block size. To perform effective compression, blocks are merged by the algorithm proposed in this...
This paper presents a gestural interaction system between human and robot using pointing movement. The virtual room, which was based on actual room, can be shown an attended object with blinking. A user pointed out an object, which he/she wants to move. The robot moves to an indicated point, or moves an indicated object to point in actual room. Moreover, to interact at actual rooms, the system that...
Ministry of Land, Infrastructure and Transport, Japan(MLIT) has decided to make railway authorities establish the monitoring system for train operation in a few years by suffering the fatal railway accidents occurred last year. Furthermore, MLIT showed this recorder's basic specifications in the Japanese Law of Shorei (technical standard). At receiving this situation, many railway authorities are...
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