In the manufacture of chips, it is important to detect defects assess whether chip potentially damageable that could cause unnecessary cost. Most assessment rules are set in light characteristics determined by defect contours, such as area and range. However, conventional image process methods seldom show a satisfactory performance on chips with complex structures because they difficult disting...

Rail surface defects such as the abrasion, scratch and peeling often cause damages to the train wheels and rail bearings. An efficient and accurate detection of rail defects is of vital importance for the safety of railway transportation. In the past few decades, automatic rail defect detection has been studied; however, most developed methods use optic-imaging techniques to collect the rail su...

In the framework of the European technological research project SQUASH 2], a general methodology is presented for shape measurement and defect detection of industrially produced objects using their characteristic 2D projections. The method is applied to the visual inspection and dimensional measurement of ferrite cores. In industrial shape defect detection, two types of measurements can be dist...

In this paper we address the problem of detecting different type of defects on random textured tiles. We adopt Gabor wavelet for analysis of random textured surfaces. Unlike the existing methods which arrange the Gabor filter Bank in such a way that the half-magnitude contour of neighboring filters in frequency domain touch each other, we allows the bandwidth of filters to vary. This flexibilit...

An infrared (IR) temperature sensor module developed for the detection of defects in a metal plate is modified for defect detection in a pipe. A module giving close sensor arrangement and maintaining a constant distance between sensor and measured object is developed and utilized in the present modification of the IR thermographic device. The defect detection performance is experimentally inves...