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Recently, many concrete social infrastructures are beginning to reach the end of their useful lives. Therefore, it is important to evaluate their condition. In this paper, we propose a method of concrete crack direction detection using visual and audio sensors. Firstly, three-dimensional measurement of the concrete surface is performed by using the light-section method. The obtained point cloud data...
In this paper, we propose a method to correct the over- and underexposed regions in images. For the correction of over- and underexposed regions, multiple light sources are used to obtain several images whose over- and underexposed regions are in different positions. The image processing consists of four steps. Firstly, multiple images are captured by alternately turning on and off the illuminations...
In this paper, we propose a method to compensate the over and under exposure regions in the image. The image processing consists of four steps. Firstly, two images are acquired by alternately turning on and off illuminations which set in two different positions. Then the image obtained first is defined as base image and the image obtained second is defined as sub image. Secondly, over and under exposure...
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