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Recycling plastic presents two problems which, if not solved, yield recycled material of poor mechanical properties and the same drab colour. Plastics must be sorted by type to avoid PVC mixing with PET (usually used for drinks bottles), therefore allowing re‐use as PET.

Explains the implications of available options in solid state imaging sensors. Focuses on features of different types of imaging sensor, citing the most general division between types as being between area scan and line scan. Looks in some depth at these two types of sensor and goes on to consider factors such as asynchronous triggering, the separation of exposure and readout time and the maintenance of spatial digitization. Provides a list of supplier addresses.

Summarises the presentations made at the UK Industrial Vision Association’s annual general meeting in September 1999, Nottiungham, UK, entitled “Innovations in illumination for machine vision”.

Fingerprints have been used to identify people for 100 years, and as a form of authentication for almost two centuries. Today’s computer and communications oriented world places great importance on authentication, and this article looks at how a new Swedish company, Precise Biometrics, has abandoned traditional fingerprint classification methods for authentication applications, after first describing those traditional methods used for both forensic and civil tasks.

Europe's first exhibition and conference combining machine vision and automatic identification technology was held in Sindelfingen, just south of Stuttgart, at the end of June. The event attracted some 2,500 visitors, many from the surrounding Baden‐Wurttemberg area which has a concentration of high technology industries. Don Braggins of Machine Vision Systems Consultancy reports on the synergy between the two events.

Comments on recent developments in the machine vision industry and describes some of the more significant exhibits at the IPOT 2001 exhibition, including camera networks, addressable pixel cameras and low resolution thermal imagers.

Some ideas on saving time in image analysis are presented by Don Braggins, of Machine Vision Systems.