Effect of charge transfer efficiency on image quality in CCD line scan-based web inspection

Jyrki Laitinen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Charge transfer efficiency limits the performance of a CCD line scan-based imaging system.
Even though the degradation of the image quality due to the inefficiency in the charge transfer is often neglected in practical work it may have considerable effect on the system performance in applications where high resolution and uniform image quality are needed. In this paper the relationship between the charge transfer efficiency and the image quality in paper web inspection and, especially, in streak detection is discussed.
A simple method for the estimation of the charge transfer efficiency is proposed. The method is based on the imaging of a square wave test pattern. The degradation of the image quality due to the charge transfer is analysed both theoretically and with practical imaging experiments.
The results show clearly the variation in the system performance along the CCD scan. This is emphasised in the case of small and low-contrast surface defects on the web.
Original languageEnglish
Pages (from-to)385-401
JournalOptics and Lasers in Engineering
Volume29
Issue number6
DOIs
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed

Fingerprint

Charge coupled devices
Image quality
Charge transfer
inspection
charge coupled devices
Inspection
charge transfer
degradation
Imaging techniques
Degradation
square waves
Surface defects
surface defects
Imaging systems
high resolution
Experiments

Cite this

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title = "Effect of charge transfer efficiency on image quality in CCD line scan-based web inspection",
abstract = "Charge transfer efficiency limits the performance of a CCD line scan-based imaging system. Even though the degradation of the image quality due to the inefficiency in the charge transfer is often neglected in practical work it may have considerable effect on the system performance in applications where high resolution and uniform image quality are needed. In this paper the relationship between the charge transfer efficiency and the image quality in paper web inspection and, especially, in streak detection is discussed. A simple method for the estimation of the charge transfer efficiency is proposed. The method is based on the imaging of a square wave test pattern. The degradation of the image quality due to the charge transfer is analysed both theoretically and with practical imaging experiments. The results show clearly the variation in the system performance along the CCD scan. This is emphasised in the case of small and low-contrast surface defects on the web.",
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Effect of charge transfer efficiency on image quality in CCD line scan-based web inspection. / Laitinen, Jyrki.

In: Optics and Lasers in Engineering, Vol. 29, No. 6, 1998, p. 385-401.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Laitinen, Jyrki

PY - 1998

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AB - Charge transfer efficiency limits the performance of a CCD line scan-based imaging system. Even though the degradation of the image quality due to the inefficiency in the charge transfer is often neglected in practical work it may have considerable effect on the system performance in applications where high resolution and uniform image quality are needed. In this paper the relationship between the charge transfer efficiency and the image quality in paper web inspection and, especially, in streak detection is discussed. A simple method for the estimation of the charge transfer efficiency is proposed. The method is based on the imaging of a square wave test pattern. The degradation of the image quality due to the charge transfer is analysed both theoretically and with practical imaging experiments. The results show clearly the variation in the system performance along the CCD scan. This is emphasised in the case of small and low-contrast surface defects on the web.

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