Automatic Surface Inspection Systems for Cold Strip

Automatic surface inspection using wavelet reconstruction

In automatic surface inspection, one has to solve the problem of detecting small surface defects which locally break the homogeneity of a texture pattern. Textures are generally classified into two major types, structural and statistical [1]. Structural textures are those that are composed of repetitions of some basic texture primitive, such as directional lines, with a deterministic rule of di...

An Automated System For Metal Strip Inspection

A prototype of an automated visual on-line metal strip inspection system is described. The system is capable of both detecting and classifying the surface defects of copper alloy smp. It has been installed on a production line in a rolling mill for evaluation. The inspection algorithms are based on morphological preprocessing and combined statistical and structural defect recognition. The image...

Automatic surface inspection for directional textures using nonnegative matrix factorization

A global image restoration scheme using nonnegative matrix factorization (NMF) is proposed in this paper. This NMF-based image restoration scheme can be used for inspecting the defects in directional texture surfaces automatically. Decomposing the gray level of image pixels into an ensemble of row vectors, we first reduce the data set from original data space into a lowerdimensional NMF space. ...

Simulation of Close-range Photogrammetric Systems for Industrial Surface Inspection

Close-range photogrammetric measurement systems are increasingly used for high-precision surface inspection of car body parts. These measurement systems are based on an active light source, the projector, and one or more cameras. Many systems use a sequence of fringe projection, mostly a combination of the gray code and phase shift technique. Basically the quality of the measurement result depe...

Free-Form Surface Matching for Surface Inspection