A continuously scanned image (CSI) gives convenient image data for inspection of elongated facilities in railways, such as tracks, rolling stocks, and so on. We have developed a system named ConSIS to take the CSI at a high data rate of 40 M pixel/s. The system comprises a line-sensor camera and a data-recorder. As the result of field tests taking the CSI of tracks, rolling stock, and tunnel walls, the feasibility of an inspection system using the CSI was confirmed. Additionally, we have developed a prototype image database system to examine effective use of the CSI, in which useful functions, such as normalizing a scale of the CSI, scrolling a continuous image, and zooming a fine image for observation, are implemented. Further, we have developed a method to extract cracks on a concrete surface for automatic inspection using the CSI and a computer.
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Sasama et al. (1998) studied this question.