A survey of thresholding techniques
Computer Vision, Graphics, and Image Processing
Performance study of several global thresholding techniques for segmentation
Computer Vision, Graphics, and Image Processing
A fast histogram-clustering approach for multi-level thresholding
Pattern Recognition Letters
A survey of automated visual inspection
Computer Vision and Image Understanding
Real-time defect inspection of textured surfaces
Real-Time Imaging
Color image processing and applications
Color image processing and applications
Automated Visual Inspection: A Survey
IEEE Transactions on Pattern Analysis and Machine Intelligence
Integration of sorting system for contaminant removal from wool using a second computer
Computers in Industry - Special issue: Machine vision
International Journal of Systems Science - Innovative Production Machines and Systems, Guest Editors: Duc-Truong Pham, Anthony Soroka and Eldaw Eldukhri
Integration of sorting system for contaminant removal from wool using a second computer
Computers in Industry
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In the textile industry, scoured wool contains different types of foreign materials (contaminants) that need to be separated out before it goes into further processing, so that the textile machines are protected from damage and the quality of the final woollen products is ensured. This paper presents an automated visual inspection (AVI) system for detecting and sorting contaminants from wool in real time. The techniques were first developed in the lab and subsequently applied to a large-scale factory system. The combinative use of image processing algorithms in RGB and HSV colour spaces can segment 96% of contaminant types (minimum size around 4cm long and 5mm in diameter) in real-time on the lab test rig. One of the most important aspects of the system is to use the non-linear colour space transformation and merge the threshold algorithm in HSV colour space into the image processing algorithms in RGB colour space to enhance the contaminant identification in real time. The real-time capability of the system is also analysed in detail. The experimental results demonstrate that the factory AVI system could identify and remove the contaminants at a camera speed of around 800 lines/s and the conveyor speed of 20m/min in real time.