2. Applications

2.1 Real-time defect detection on metal disks

The non-destructive testing of manufactured products makes increasing use of real-time image processing techniques to automatically detect defects on moving objects. In the field of metallurgy, for example, the environmental constraints are the size of the defects to be detected and the speed of the objects to be inspected.

Defects can be of the order of a millimeter in size for an analysis field of several tens of centimeters, and the objects to be analyzed can travel at speeds of up to 1 m/s.

To meet these requirements, designers of real-time vision systems must comply with the following conditions:

• the illumination must be as uniform as possible...