In-field evaluation of the modulation transfer function and the signal-to-noise ratio of electronic-display devices

Hans Roehrig, Jerry Gaskill, Jiahua Fan, Chadwick Martin, John E Greivenkamp, Ehsan Samei

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper describes a charged-coupled device (CCD) camera, which was developed for in-field evaluation of the image quality of electronic-display devices [such as cathode-ray tubes (CRTs) and liquid-crystal displays (LCDs)] used for medical applications. Contrary to traditional cameras for display-image-quality evaluation, this CCD camera does not require a sophisticated x-y-z translation stage for mounting and adjustment. Instead, it is handheld and pressed by gentle pressure against the display screen. It is controlled by a software package which was originally developed for display calibration according to the DICOM 14 gray-scale standard display function (CSDF).1 This software package controls the camera gain when measurements are made at different display luminance, display test patterns, performs image analysis and displays the results of the measurements and calculations. The work concentrated on the measurement of modulation transfer function (MTF) and of signal-to-noise ratio (SNR) per display pixel. The MTF is derived from the Fourier transform of the line spread function (LSF). The single-display-pixel SNR is derived from the integration of the noise power spectrum (NPS) of a camera image taken of a display with a uniform luminance. It is demonstrated that the device can produce repeatable results in terms of MTF and SNR. MTFs were measured on three monochrome CRTs and five monochrome LCDs in order to study repeatability and similar quantities. The MTF was measured on a 5-Mpixel LCD yielding values that lie within 3.5% of the average MTF at the Nyquist frequency and 4.0% of the maximum total sharpness (∫ MTF2 df). The MTF was also measured on a 9-Mpixel LCD, yielding values that lie within 9.0% of the average MTF at the Nyquist frequency and 8.0% of the maximum total sharpness. The SNR was measured eight times on a 3-Mpixel monochrome LCD at nine digital driving levels (DDLs). At a DDL of 185, the mean SNR was 15.694 and the standard deviation (Stdv) was 0.587. At a DDL of 65, the mean SNR was 5.675 and Stdv was 0.120.

Original languageEnglish (US)
Pages (from-to)847-860
Number of pages14
JournalJournal of the Society for Information Display
Volume14
Issue number10
DOIs
StatePublished - Oct 2006

Fingerprint

Optical transfer function
modulation transfer function
display devices
Signal to noise ratio
signal to noise ratios
Display devices
evaluation
Liquid crystal displays
electronics
liquid crystals
cameras
Cameras
Nyquist frequencies
cathode ray tubes
sharpness
luminance
Cathode ray tubes
standard deviation
Software packages
pixels

Keywords

  • CCD camera lens
  • CRT
  • In-field image-quality evaluation
  • LCD
  • MTF
  • SNR
  • Software camera control

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

In-field evaluation of the modulation transfer function and the signal-to-noise ratio of electronic-display devices. / Roehrig, Hans; Gaskill, Jerry; Fan, Jiahua; Martin, Chadwick; Greivenkamp, John E; Samei, Ehsan.

In: Journal of the Society for Information Display, Vol. 14, No. 10, 10.2006, p. 847-860.

Research output: Contribution to journalArticle

Roehrig, Hans ; Gaskill, Jerry ; Fan, Jiahua ; Martin, Chadwick ; Greivenkamp, John E ; Samei, Ehsan. / In-field evaluation of the modulation transfer function and the signal-to-noise ratio of electronic-display devices. In: Journal of the Society for Information Display. 2006 ; Vol. 14, No. 10. pp. 847-860.
@article{eb4e6c7b93e449778d45e29da6ab8cb9,
title = "In-field evaluation of the modulation transfer function and the signal-to-noise ratio of electronic-display devices",
abstract = "This paper describes a charged-coupled device (CCD) camera, which was developed for in-field evaluation of the image quality of electronic-display devices [such as cathode-ray tubes (CRTs) and liquid-crystal displays (LCDs)] used for medical applications. Contrary to traditional cameras for display-image-quality evaluation, this CCD camera does not require a sophisticated x-y-z translation stage for mounting and adjustment. Instead, it is handheld and pressed by gentle pressure against the display screen. It is controlled by a software package which was originally developed for display calibration according to the DICOM 14 gray-scale standard display function (CSDF).1 This software package controls the camera gain when measurements are made at different display luminance, display test patterns, performs image analysis and displays the results of the measurements and calculations. The work concentrated on the measurement of modulation transfer function (MTF) and of signal-to-noise ratio (SNR) per display pixel. The MTF is derived from the Fourier transform of the line spread function (LSF). The single-display-pixel SNR is derived from the integration of the noise power spectrum (NPS) of a camera image taken of a display with a uniform luminance. It is demonstrated that the device can produce repeatable results in terms of MTF and SNR. MTFs were measured on three monochrome CRTs and five monochrome LCDs in order to study repeatability and similar quantities. The MTF was measured on a 5-Mpixel LCD yielding values that lie within 3.5{\%} of the average MTF at the Nyquist frequency and 4.0{\%} of the maximum total sharpness (∫ MTF2 df). The MTF was also measured on a 9-Mpixel LCD, yielding values that lie within 9.0{\%} of the average MTF at the Nyquist frequency and 8.0{\%} of the maximum total sharpness. The SNR was measured eight times on a 3-Mpixel monochrome LCD at nine digital driving levels (DDLs). At a DDL of 185, the mean SNR was 15.694 and the standard deviation (Stdv) was 0.587. At a DDL of 65, the mean SNR was 5.675 and Stdv was 0.120.",
keywords = "CCD camera lens, CRT, In-field image-quality evaluation, LCD, MTF, SNR, Software camera control",
author = "Hans Roehrig and Jerry Gaskill and Jiahua Fan and Chadwick Martin and Greivenkamp, {John E} and Ehsan Samei",
year = "2006",
month = "10",
doi = "10.1889/1.2372418",
language = "English (US)",
volume = "14",
pages = "847--860",
journal = "Proceedings of the Society for Information Display",
issn = "1071-0922",
publisher = "Society for Information Display",
number = "10",

}

TY - JOUR

T1 - In-field evaluation of the modulation transfer function and the signal-to-noise ratio of electronic-display devices

AU - Roehrig, Hans

AU - Gaskill, Jerry

AU - Fan, Jiahua

AU - Martin, Chadwick

AU - Greivenkamp, John E

AU - Samei, Ehsan

PY - 2006/10

Y1 - 2006/10

N2 - This paper describes a charged-coupled device (CCD) camera, which was developed for in-field evaluation of the image quality of electronic-display devices [such as cathode-ray tubes (CRTs) and liquid-crystal displays (LCDs)] used for medical applications. Contrary to traditional cameras for display-image-quality evaluation, this CCD camera does not require a sophisticated x-y-z translation stage for mounting and adjustment. Instead, it is handheld and pressed by gentle pressure against the display screen. It is controlled by a software package which was originally developed for display calibration according to the DICOM 14 gray-scale standard display function (CSDF).1 This software package controls the camera gain when measurements are made at different display luminance, display test patterns, performs image analysis and displays the results of the measurements and calculations. The work concentrated on the measurement of modulation transfer function (MTF) and of signal-to-noise ratio (SNR) per display pixel. The MTF is derived from the Fourier transform of the line spread function (LSF). The single-display-pixel SNR is derived from the integration of the noise power spectrum (NPS) of a camera image taken of a display with a uniform luminance. It is demonstrated that the device can produce repeatable results in terms of MTF and SNR. MTFs were measured on three monochrome CRTs and five monochrome LCDs in order to study repeatability and similar quantities. The MTF was measured on a 5-Mpixel LCD yielding values that lie within 3.5% of the average MTF at the Nyquist frequency and 4.0% of the maximum total sharpness (∫ MTF2 df). The MTF was also measured on a 9-Mpixel LCD, yielding values that lie within 9.0% of the average MTF at the Nyquist frequency and 8.0% of the maximum total sharpness. The SNR was measured eight times on a 3-Mpixel monochrome LCD at nine digital driving levels (DDLs). At a DDL of 185, the mean SNR was 15.694 and the standard deviation (Stdv) was 0.587. At a DDL of 65, the mean SNR was 5.675 and Stdv was 0.120.

AB - This paper describes a charged-coupled device (CCD) camera, which was developed for in-field evaluation of the image quality of electronic-display devices [such as cathode-ray tubes (CRTs) and liquid-crystal displays (LCDs)] used for medical applications. Contrary to traditional cameras for display-image-quality evaluation, this CCD camera does not require a sophisticated x-y-z translation stage for mounting and adjustment. Instead, it is handheld and pressed by gentle pressure against the display screen. It is controlled by a software package which was originally developed for display calibration according to the DICOM 14 gray-scale standard display function (CSDF).1 This software package controls the camera gain when measurements are made at different display luminance, display test patterns, performs image analysis and displays the results of the measurements and calculations. The work concentrated on the measurement of modulation transfer function (MTF) and of signal-to-noise ratio (SNR) per display pixel. The MTF is derived from the Fourier transform of the line spread function (LSF). The single-display-pixel SNR is derived from the integration of the noise power spectrum (NPS) of a camera image taken of a display with a uniform luminance. It is demonstrated that the device can produce repeatable results in terms of MTF and SNR. MTFs were measured on three monochrome CRTs and five monochrome LCDs in order to study repeatability and similar quantities. The MTF was measured on a 5-Mpixel LCD yielding values that lie within 3.5% of the average MTF at the Nyquist frequency and 4.0% of the maximum total sharpness (∫ MTF2 df). The MTF was also measured on a 9-Mpixel LCD, yielding values that lie within 9.0% of the average MTF at the Nyquist frequency and 8.0% of the maximum total sharpness. The SNR was measured eight times on a 3-Mpixel monochrome LCD at nine digital driving levels (DDLs). At a DDL of 185, the mean SNR was 15.694 and the standard deviation (Stdv) was 0.587. At a DDL of 65, the mean SNR was 5.675 and Stdv was 0.120.

KW - CCD camera lens

KW - CRT

KW - In-field image-quality evaluation

KW - LCD

KW - MTF

KW - SNR

KW - Software camera control

UR - http://www.scopus.com/inward/record.url?scp=54049136126&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=54049136126&partnerID=8YFLogxK

U2 - 10.1889/1.2372418

DO - 10.1889/1.2372418

M3 - Article

AN - SCOPUS:54049136126

VL - 14

SP - 847

EP - 860

JO - Proceedings of the Society for Information Display

JF - Proceedings of the Society for Information Display

SN - 1071-0922

IS - 10

ER -