Abstract
Concrete crack inspection has become very important in recent years, because the deterioration of cocrete structure is progressing. This kind of inspection has been the visual inspection for the most part so far. The authors have develped a new method for such inspection using an image processing system assembled from a personal computer and image processing softwares.
The procedure is firstly to take the surface condition of cocrete structure by video camera into video tape, and then to analyze the image for concrete crack inspection. The authors had two applications. One is an analysis of the progress of cocrete breaking of test piece in the laboratory. Another is an analysis of condition of the cracks upon the wall surface of an used building. Two results are obtained;
(1) Histogram pattern of crack existing area is flatter than that of non-crack existing area. In addition, a new mound is born at crack generation and grows with the increment of crack area.
(2) The above result was same in the test piece of the laboratory and in the wall surface of the build-ing.
