Industrial use of a real-time optical inspection system

Abstract

Real-time optical inspection techniques are discussed and implemented on laboratory systems. Specifically, we show how Fourier transform and Hough transform data can be used in an industrial inspection application. We also discuss how a 1-D synthetic discriminant function is used for label inspection. Real-time optical Hough transform inspection data using a 2-D spatial light modulator is presented and discussed. A color liquid crystal television (LCTV) is used as the input transducer to provide real-time data. New methods to process color image data on color LCTVs are detailed. A new high speed acoustooptic architecture to generate Hough transform slices is also detailed. A specific product inspection case study is discussed.

Product label inspection using transputers

“…There are numerous approaches for tackling this problem ranging from template matching [5] to Hough transforms [6]. However, the methods used are generally not fast enough for a real-time environment, unless the bottlenecks involved are hardwired (e.g.…”

Spatial Light Modulator Used for the Fourier Transformation of Video Images

“…An overview was given by Efron [6]. With a combination of a video camera and liquid crystal television (LCTV) device Casasent and colleagues [7][8][9] constructed a commercially available real-time (15 objects s -1) Fourier transform inspection system.…”