Design and Implementation of Crack Width Detection System Based on Android

In general, the method of conventional crack width detection based on PC is short of flexibility and convenience. A portable system for detecting crack width based on Android was researched and designed. Firstly, it used mobile phone camera to collect the crack image. Then, the collected image was processed by utilizing digital image processing technique, including preprocessing, filtering by utilizing morphological filter and canny edge-detection, and then extracted the edges of the crack and calculated the width. Compared the values of the system detected with the data of crack width detector, the relative error does not exceed 7%. The experimental results show that the system can detect the edges of the crack accurately and the width of the crack has higher accuracy compared with the standard width of the crack, so this system can make the measure more convenient and improve the efficiency of detection greatly.