Surface defect detection for printed circuit board (PCB) is indispensable managing PCB production quality. However, automatic of surface defects still a challenging task because, even within the same category defect, present great differences in morphology and pattern. Although many computer vision-based detectors have been established to handle these problems, current struggle achieve high acc...

As a variant of Shokurov’s criterion of toric surface, we give a criterion of two new classes of normal projective surfaces, called pseudo-toric surfaces of defect one and half-toric surfaces. A typical example of pseudo-toric surface of defect one is the blown up of a projective toric surface at a nonsingular point of the boundary divisor. A half-toric surface is the quotient of a projective t...

In this research, a simulation system based on physical model and its lighting feature is developed to perform three-dimensional creation, graphics software used randomly generate simulated surface with defects, which also cooperates the virtual environment reproduce original environment. Furthermore, use of generative adversarial network optimize dataset created symmetrically by studied in ord...

In the majority of semiconductor manufacturing, the visual inspection process of the wafer surface depends on human experts. However, the inefficiencies of human visual inspection has led to the development of image process to perform inspection tasks. The occurrence of different type of defect arises from the manufacturing processed variations, like miss-out calibration or poor maintenance of ...

In this paper the performance of two histogram-based texture analysis techniques for surface defect detection is evaluated. These techniques are the co-occurrence matrix method and the local binary pattern method. Both methods yield a set of texture features that are computed from a small image window. The unsupervised segmentation procedure is used in the experiments. It is based on the statis...

Polyester gelcoat has been a useful and popular coating for RP fabrication for over twenty years. The gelcoat has not only been important as a protective coating for the fiberglass laminate in a large variety of construction applications, but in many cases has provided a cosmetically desirable finish that enhances the attractiveness and market value of the RP part. In recent years as the manufa...