Manufacturers of high quality glass plates are experiencing mounting pressure to boost production rates, improve quality and increase yields in many fields or production, automatic surface inspection systems can help to overcome the typical problems which arise of visual inspection by human operators, machine vision guarantees exact, objective and reproducable inspection results, which is why an automatic 100% surface inspection not only ensures customer satisfaction but also leads to cost efficient production processes by optimising material economy and load balance. The following text emphasises the principle of the laser-based surface inspection system siris-g by sis gmbh, which was designed with particular concern for detecting flaws on glass surfaces