Method for evaluation of imaging in automated visual web inspection

Jyrki Laitinen, Ilkka Moring

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

The quality of the image is crucial for the performance of a visual surface inspection system. The final image quality is affected by the properties of the imaging unit. In order to evaluate the quality of the imaging unit a designer should be able to characterize the imaging performance using quantitative figures of merit. The suitability of the modulation transfer function (MTF) for the figure of merit of imaging in visual web inspection is discussed. A straightforward setup for the determination of the system MTF is suggested. Three exemplary cases are analyzed: (1) the performance of an imaging system as a function of the system f number, (2) the performance of an imaging system against the depth-of-field requirement, and (3) the performance of a TDI imager against speed mismatching. In order to relate the system MTFs to image quality, a set of defective samples from a paper manufacturing process was collected and imaged. Quantitative image quality criteria are proposed, and the sample images are analyzed according to these criteria. The final image quality is compared with the corresponding system MTF values.
Original languageEnglish
Pages (from-to)2184 - 2196
Number of pages13
JournalOptical Engineering
Volume36
Issue number8
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

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Image quality
inspection
Optical transfer function
Inspection
modulation transfer function
Imaging techniques
evaluation
Imaging systems
figure of merit
Image sensors
manufacturing
requirements

Keywords

  • automated visual surface inspection
  • web inspection
  • image quality
  • modulation transfer function

Cite this

Laitinen, Jyrki ; Moring, Ilkka. / Method for evaluation of imaging in automated visual web inspection. In: Optical Engineering. 1997 ; Vol. 36, No. 8. pp. 2184 - 2196.
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Method for evaluation of imaging in automated visual web inspection. / Laitinen, Jyrki; Moring, Ilkka.

In: Optical Engineering, Vol. 36, No. 8, 1997, p. 2184 - 2196.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Moring, Ilkka

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