Pairing human and machine-vision in industrial inspection tasks

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4 Scopus citations


The traditional job of a quality control inspector, whether a human or a machine- vision device, is to discriminate products into "acceptable" and "rejectable" items. Acceptable items are those which confirm to a set of predetermined standards or quality characteristics. The performance of inspectors can be measured in terms of rejecting conforming items (type I error) or classifying non-confirming items as acceptable (type II error). Such inspection systems tend to be error prone. Reinspection is often used as a final means to remedy this situation and ensure higher outgoing quality. Effectiveness is limited by the fault rate effect, which shows decreasing defect detection performance with successive stages of reinspection. This paper uses a model of the inspector as a conservative signal detector to examine the various ways in which the positive attributes of human and machine-vision inspection systems can be combined to achieve enhanced system performance.

Original languageEnglish (US)
Pages (from-to)171-182
Number of pages12
JournalControl Engineering Practice
Issue number1
StatePublished - Feb 1993

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


  • Signal detection theory
  • human factors
  • quality control, man-machine systems
  • team performance evaluation


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