Acquisition Accuracy Evaluation in Visual Inspection Systems - a Practical Approach

TL;DR

This paper proposes a practical set of parameters and methods for evaluating the accuracy of visual inspection systems, demonstrated on monochrome boards and extendable to color systems, with a software environment for testing.

Contribution

It introduces a comprehensive parameter set and a software tool for accuracy evaluation of visual inspection systems, applicable to various acquisition hardware.

Findings

Evaluation of two types of video acquisition boards.

Parameters effectively characterize system accuracy.

Method can be extended to color systems.

Abstract

This paper draws a proposal of a set of parameters and methods for accuracy evaluation of visual inspection systems. The case of a monochrome board is treated, but practically all conclusions and methods may be extended for colour acquisition. Basically, the proposed parameters are grouped in five sets as follows:Internal noise;Video ADC cuantisation parameters;Analogue processing section parameters;Dominant frequencies;Synchronisation (lock-in) accuracy. On basis of this set of parameters was developed a software environment, in conjunction with a test signal generator that allows the "test" images. The paper also presents conclusions of evaluation for two types of video acquisition boards