Image quality evaluation of color displays using a Fovean color camera

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

doi:10.1117/12.713865

21 March 2007 Image quality evaluation of color displays using a Fovean color camera

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

Proceedings Volume 6516, Medical Imaging 2007: PACS and Imaging Informatics; 651611 (2007) https://doi.org/10.1117/12.713865
Event: Medical Imaging, 2007, San Diego, CA, United States

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.

Citation Download Citation

Hans Roehrig, William J. Dallas, Jiahua Fan, Elizabeth A. Krupinski, Gary R. Redford, and Takahiro Yoneda "Image quality evaluation of color displays using a Fovean color camera", Proc. SPIE 6516, Medical Imaging 2007: PACS and Imaging Informatics, 651611 (21 March 2007); https://doi.org/10.1117/12.713865

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KEYWORDS

LCDs

Cameras

Modulation transfer functions

Calibration

Image quality

Sensors

Optical filters

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