Image quality evaluation of color displays using a Foveon color camera

Hans Roehrig, William J. Dallas, Jiahua Fan, Elizabeth A Krupinski, Gary R. Redford, Takahiro Yoneda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This paper presents preliminary data on the use of a color camera for the evaluation of Quality Control (QC) and Quality Analysis (QA) of a color LCD in comparison with that of a monochrome LCD. The color camera is a C-MOS camera with a pixel size of 9 μm and a pixel matrix of 2268 × 1512 × 3. The camera uses a sensor that has co-located pixels for all three primary colors. The imaging geometry used mostly was 12 × 12 camera pixels per display pixel even though it appears that an imaging geometry of 17.6 might provide results which are more accurate. The color camera is used as an imaging colorimeter, where each camera pixel is calibrated to serve as a colorimeter. This capability permits the camera to determine chromaticity of the color LCD at different sections of the display. After the color calibration with a CS-200 colorimeter the color coordinates of the display's primaries determined from the camera's luminance response are very close to those found from the CS-200. Only the color coordinates of the display's white point were in error. Modulation Transfer Function (MTF) as well as Noise in terms of the Noise Power Spectrum (NPS) of both LCDs were evaluated. The horizontal MTFs of both displays have a larger negative slope than the vertical MTFs, indicating that the horizontal MTFs are poorer than the vertical MTFs. However the modulations at the Nyquist frequency seem lower for the color LCD than for the monochrome LCD. These results contradict simulations regarding MTFs in the vertical direction. The spatial noise of the color display in both directions are larger than that of the monochrome display. Attempts were also made to analyze the total noise in terms of spatial and temporal noise by applying subtractions of images taken at exactly the same exposure. Temporal noise seems to be significantly lower than spatial noise.

Original languageEnglish (US)
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume6516
DOIs
StatePublished - 2007
EventMedical Imaging 2007: PACS and Imaging Informatics - San Diego, CA, United States
Duration: Feb 20 2007Feb 22 2007

Other

OtherMedical Imaging 2007: PACS and Imaging Informatics
CountryUnited States
CitySan Diego, CA
Period2/20/072/22/07

Fingerprint

Image quality
Cameras
Display devices
Color
Liquid crystal displays
Pixels
Colorimeters
Imaging techniques
Geometry
Optical transfer function
Power spectrum
Quality control
Luminance
Modulation
Calibration
Sensors

Keywords

  • Color LCD
  • Colorimeter
  • Foveon camera
  • Image quality control
  • Imaging colorimeter
  • MTF
  • NPS

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Roehrig, H., Dallas, W. J., Fan, J., Krupinski, E. A., Redford, G. R., & Yoneda, T. (2007). Image quality evaluation of color displays using a Foveon color camera. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 6516). [651611] https://doi.org/10.1117/12.713865

Image quality evaluation of color displays using a Foveon color camera. / Roehrig, Hans; Dallas, William J.; Fan, Jiahua; Krupinski, Elizabeth A; Redford, Gary R.; Yoneda, Takahiro.

Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 6516 2007. 651611.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Roehrig, H, Dallas, WJ, Fan, J, Krupinski, EA, Redford, GR & Yoneda, T 2007, Image quality evaluation of color displays using a Foveon color camera. in Progress in Biomedical Optics and Imaging - Proceedings of SPIE. vol. 6516, 651611, Medical Imaging 2007: PACS and Imaging Informatics, San Diego, CA, United States, 2/20/07. https://doi.org/10.1117/12.713865
Roehrig H, Dallas WJ, Fan J, Krupinski EA, Redford GR, Yoneda T. Image quality evaluation of color displays using a Foveon color camera. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 6516. 2007. 651611 https://doi.org/10.1117/12.713865
Roehrig, Hans ; Dallas, William J. ; Fan, Jiahua ; Krupinski, Elizabeth A ; Redford, Gary R. ; Yoneda, Takahiro. / Image quality evaluation of color displays using a Foveon color camera. Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 6516 2007.
@inproceedings{73b7531b4f1c43e0ba619880ccabb05d,
title = "Image quality evaluation of color displays using a Foveon color camera",
abstract = "This paper presents preliminary data on the use of a color camera for the evaluation of Quality Control (QC) and Quality Analysis (QA) of a color LCD in comparison with that of a monochrome LCD. The color camera is a C-MOS camera with a pixel size of 9 μm and a pixel matrix of 2268 × 1512 × 3. The camera uses a sensor that has co-located pixels for all three primary colors. The imaging geometry used mostly was 12 × 12 camera pixels per display pixel even though it appears that an imaging geometry of 17.6 might provide results which are more accurate. The color camera is used as an imaging colorimeter, where each camera pixel is calibrated to serve as a colorimeter. This capability permits the camera to determine chromaticity of the color LCD at different sections of the display. After the color calibration with a CS-200 colorimeter the color coordinates of the display's primaries determined from the camera's luminance response are very close to those found from the CS-200. Only the color coordinates of the display's white point were in error. Modulation Transfer Function (MTF) as well as Noise in terms of the Noise Power Spectrum (NPS) of both LCDs were evaluated. The horizontal MTFs of both displays have a larger negative slope than the vertical MTFs, indicating that the horizontal MTFs are poorer than the vertical MTFs. However the modulations at the Nyquist frequency seem lower for the color LCD than for the monochrome LCD. These results contradict simulations regarding MTFs in the vertical direction. The spatial noise of the color display in both directions are larger than that of the monochrome display. Attempts were also made to analyze the total noise in terms of spatial and temporal noise by applying subtractions of images taken at exactly the same exposure. Temporal noise seems to be significantly lower than spatial noise.",
keywords = "Color LCD, Colorimeter, Foveon camera, Image quality control, Imaging colorimeter, MTF, NPS",
author = "Hans Roehrig and Dallas, {William J.} and Jiahua Fan and Krupinski, {Elizabeth A} and Redford, {Gary R.} and Takahiro Yoneda",
year = "2007",
doi = "10.1117/12.713865",
language = "English (US)",
isbn = "0819466344",
volume = "6516",
booktitle = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",

}

TY - GEN

T1 - Image quality evaluation of color displays using a Foveon color camera

AU - Roehrig, Hans

AU - Dallas, William J.

AU - Fan, Jiahua

AU - Krupinski, Elizabeth A

AU - Redford, Gary R.

AU - Yoneda, Takahiro

PY - 2007

Y1 - 2007

N2 - This paper presents preliminary data on the use of a color camera for the evaluation of Quality Control (QC) and Quality Analysis (QA) of a color LCD in comparison with that of a monochrome LCD. The color camera is a C-MOS camera with a pixel size of 9 μm and a pixel matrix of 2268 × 1512 × 3. The camera uses a sensor that has co-located pixels for all three primary colors. The imaging geometry used mostly was 12 × 12 camera pixels per display pixel even though it appears that an imaging geometry of 17.6 might provide results which are more accurate. The color camera is used as an imaging colorimeter, where each camera pixel is calibrated to serve as a colorimeter. This capability permits the camera to determine chromaticity of the color LCD at different sections of the display. After the color calibration with a CS-200 colorimeter the color coordinates of the display's primaries determined from the camera's luminance response are very close to those found from the CS-200. Only the color coordinates of the display's white point were in error. Modulation Transfer Function (MTF) as well as Noise in terms of the Noise Power Spectrum (NPS) of both LCDs were evaluated. The horizontal MTFs of both displays have a larger negative slope than the vertical MTFs, indicating that the horizontal MTFs are poorer than the vertical MTFs. However the modulations at the Nyquist frequency seem lower for the color LCD than for the monochrome LCD. These results contradict simulations regarding MTFs in the vertical direction. The spatial noise of the color display in both directions are larger than that of the monochrome display. Attempts were also made to analyze the total noise in terms of spatial and temporal noise by applying subtractions of images taken at exactly the same exposure. Temporal noise seems to be significantly lower than spatial noise.

AB - This paper presents preliminary data on the use of a color camera for the evaluation of Quality Control (QC) and Quality Analysis (QA) of a color LCD in comparison with that of a monochrome LCD. The color camera is a C-MOS camera with a pixel size of 9 μm and a pixel matrix of 2268 × 1512 × 3. The camera uses a sensor that has co-located pixels for all three primary colors. The imaging geometry used mostly was 12 × 12 camera pixels per display pixel even though it appears that an imaging geometry of 17.6 might provide results which are more accurate. The color camera is used as an imaging colorimeter, where each camera pixel is calibrated to serve as a colorimeter. This capability permits the camera to determine chromaticity of the color LCD at different sections of the display. After the color calibration with a CS-200 colorimeter the color coordinates of the display's primaries determined from the camera's luminance response are very close to those found from the CS-200. Only the color coordinates of the display's white point were in error. Modulation Transfer Function (MTF) as well as Noise in terms of the Noise Power Spectrum (NPS) of both LCDs were evaluated. The horizontal MTFs of both displays have a larger negative slope than the vertical MTFs, indicating that the horizontal MTFs are poorer than the vertical MTFs. However the modulations at the Nyquist frequency seem lower for the color LCD than for the monochrome LCD. These results contradict simulations regarding MTFs in the vertical direction. The spatial noise of the color display in both directions are larger than that of the monochrome display. Attempts were also made to analyze the total noise in terms of spatial and temporal noise by applying subtractions of images taken at exactly the same exposure. Temporal noise seems to be significantly lower than spatial noise.

KW - Color LCD

KW - Colorimeter

KW - Foveon camera

KW - Image quality control

KW - Imaging colorimeter

KW - MTF

KW - NPS

UR - http://www.scopus.com/inward/record.url?scp=35148877771&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=35148877771&partnerID=8YFLogxK

U2 - 10.1117/12.713865

DO - 10.1117/12.713865

M3 - Conference contribution

AN - SCOPUS:35148877771

SN - 0819466344

SN - 9780819466341

VL - 6516

BT - Progress in Biomedical Optics and Imaging - Proceedings of SPIE

ER -