Real-Time Optical Hough Transform for Industrial Inspection

<title>Computer-generated holograms for optical data processing</title>

“…Many object identification applications of the HT exist [6]. Figures 3 and 4 show two product inspection applications [4,5] of the HT. In Figure 3a, we show three wire terminals (good, splayed and smashed) to be inspected.…”

“…These optically generated features include: Fourier coefficients, wedge-ring sampled (WRD) Fourier samples [3], moments, We discuss several recently fabricated Hough transform (HT) product inspection applications. The HT optical system [4] is shown in Figure 2. The input image of the product is edge-enhanced (EE) by a CGH at P2 with selective directions and its HT is then formed at the output P4 by the HT CGH at P3.…”