Abstract
In recent years, social capital came around the old and rotten, such as concrete structures including the bridge built in the high growth era. It is becoming a subject to perform the maintenance management efficiently with degradation of these structures. However, it evaluation of the soundness in maintenance management is depends on experiential intuition of advanced specialists and engineering judgment until now. While the necessity for maintenance repair of a structure increases, the present condition is that specialists are insufficient. The objective of this research is perform diagnosis on a computer for degradation diagnosis of a concrete structure. First, it was inspected from this technology. This technique for a crack is extracted using evolutional image processing technology from the digital image which photograph the concrete structure.
