Automatic visual surface inspection is a challenging task, which has become important for quality assurance in the last years. Wire rope inspection is a special problem within this field. Usually, the huge and heavy ropes cannot be detached. Thus, an inspection of the ropes must be conducted, while the ropes are in use. The rope surface exhibits various appearance characteristics so that the ex...

A reliable inspection system for thin film magnetic head (TFH) patterns on a ceramic wafer substrate has been developed. Since the TFH patterns have a great variety of shapes, the inspection criteria becomes much more complex; that is, the fatal defect size and orientation are defined according to pattern shape. To overcome this problem, we have developed a method that can detect fatal defects ...

The inspection of welds plays a crucial role in world wide industrialized markets. It is needed for assuring safety and consistency in several industrial sectors. The special types of vision inspection systems are used to defeat the crisis such as inaccuracy in images, non-uniformed illumination, noise and deficient contrast, confusion of defects in same spot at surface. Non-destructive testing...

An efficient measure of the concrete block structure inspection is needed with the increasing demand for concrete blocks. Cracks in the surface of RC member's can be used as a useful measure of quake-proofness of a construction or material fatigue. Specialists used to observe the cracks and experimentally inspect the structures, while applying destructive forces to the blocks. This paper propos...

The magnetic flux leakage (MFL) method is currently the most commonly used pipeline inspection technique. In this paper, numerical simulation and experimental investigation on defect inspection in pipeline steel using MFL were carried out. In theoretical analysis, typical three-dimensional (3D) defects were accurately modeled and detailed MFL signals in the test surface were calculated by 3D fi...

The process industry is increasingly making use of Risk Based Inspection (RBI) techniques to develop cost and/or safety optimal inspection plans. This paper makes use of the gamma stochastic deterioration process to model the corrosion damage mechanism. This model is successfully extended to update prior knowledge over the corrosion rate with imperfect wall thickness measurements. This is very ...

Purpose – This paper describes the development of a novel automated vision system used to detect the visual defects on painted slates. Design/methodology/approach – The vision system that has been developed consists of two major components covering the opto-mechanical and algorithmical aspects of the system. The first component addresses issues including the mechanical implementation and interf...

In this paper we present a Computer Vision system for printed circuit board (PCB) automated inspection. In the last years PCB industry has been invested in manufacturing automation improvement. This is known, especially in measurement and inspection field. We can note that the tolerances on PCB assembly become more accurate. With computer hardware and cameras advances, new Computer Vision algor...

After 1994, highway bridges are maintained under the Special Law on Structure Safety in Korea. To keep a structure good condition, inspection of the structure has to be performed periodically. The inspection is hard work and needs a lot of time and many inspectors to inspect the structure that is important or damaged. Generally, This contains subjectivity of inspector, and so the result of insp...

In visual surface inspection applications, a problem often faced is the collection and labelling of training material. The manual labelling of training samples requires much effort and is error prone since the defect classes may appear difficult to discriminate even for a human. Frequent changes in the inspected material or imaging conditions may lead to impractical often repeating training mat...