Nondestructive testing and defect detection using optical techniques has been extensively investigated. This communication presents a simple method for defect detection in deformed circular plates using moiré deflectometry. The experimental arrangement is simple, inexpensive and does not require elaborate vibration isolation requirements.

We present a new approach to detecting defects in random textures which requires only very few defect free samples for unsupervised training. Each product image is divided into overlapping patches of various sizes. Then, density mixture models are applied to reduce groupings of patches to a number of textural exemplars, referred to here as texems, characterising the means and covariances of who...

Three-dimensional measurement and defect detection is an effective guarantee for improving the product quality. In this paper, we present a new 3-D overall measurement method using only one image, which can be effectively used in the defect detection. Compared with the former defect technology, such as the eddy current technology, the leakage of magnetic technology, the infrared technology, and...

Texture defect detection methods are used for quality control purposes. Inspection systems fullfilling this task should be able to determine the necessary parameter sets automatically in case of a task change. One of these parameters is the size of the image window from which texture features are calculated. We present an approach for the calculation of an appropriate window size for statistica...

Printed circuit boards (PCBs) are primarily used to connect electronic components each other. It is one of the most important stages in manufacturing products. A small defect PCB can make final product inoperable. Therefore, careful and meticulous detection steps necessary indispensable process. The methods generally be divided into manual inspection automatic optical (AOI). main disadvantage t...