Maintaining civil aircraft air-worthiness requires the reliability of a complex, socio-technic system. This system's reliability is dependent on the reliability of its components (i.e, equipment, inspectors, the physical environment), and on how reliably these components interact. Error is the measurement counterpart of reliability, and most, if not all, errors can be classified at some stages ...

An image is never noise free. Visual inspection of a part from its image is therefore affected by image errors. Understanding how image errors affect measurement precision is therefore critical for accurate inspection. In this paper, we lay out a statistical framework that allows to explicitly handle image errors and characterize their impact on measurement precision. A hierarchical model is al...

In the present paper we extend in two ways some results presented in Kotz and Johnson (Comm. in Statistics (1982), All ) relating to the study of distributional aspects of effects of errors in inspection sampling: (1) Multistage sampling with k successive samples involving the possibility of two types of errors in inspection (classifying a defective individual as non-defective, or a non-defecti...

Spatial quantization error and displacement error are inherent in automated visual inspection systems. This paper discusses the effect of spatial quantization errors and displacement errors on the precision dimensional measurements for an edge segment. Probabilistic analysis in terms of the resolution of the image is developed for two-dimensional (2-D) quantization errors. Expressions for the m...

This article presents an optimized sensor planning system for active visual inspection Ž . of three-dimensional manufacturing computer-aided design CAD models. Quantization errors and displacement errors are inevitable in active visual inspection. To obtain high accuracy for dimensioning the entities of three-dimensional CAD models, minimization of these errors is essential. Spatial quantizatio...

In practice the items received in a lot may contain defective items, and the screening process to eliminate the defective items may involve both a Type I and a Type II error. Due to the defective items and the inspection errors, shortages may sometimes occur. In this paper, we develop an economic order quantity model with imperfect quality items, inspection errors, shortage backordering, and sa...

General inspector errors may consist of accepting defective units of product or rejecting good units of product. It can be said that the human element in the inspection process is the inspector himself, who contributes to inspection errors. Besides some other errors like use of wrong spesifications, wrong measuring instrument, improper filling of documents etc., in some cases the effects of ins...