28 May 2001 Method for in-field evaluation of the modulation transfer function of electronic display devices
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Abstract
Electronic medical display devices require routine monitoring of their resolution characteristics. This paper introduces a methodology for the assessment of resolution (MTF) characteristics of display devices using a photographic-grade CCD camera, and reports initial MTF measurements on a 5 megapixel medical CRT display device at three display resolution settings. The intrinsic performance of the camera was first evaluated. The camera was placed at a 2 cm distance form the display's faceplate and focused on the image plane. For each MTF assessment, the images of two test patterns were captured without moving the camera, each containing a single-pixel-wide, low- modulation (20% positive contrast) horizontal or orthogonal MTFs were deduced by 1) linearizing the data, 2) identifying the angle of the line transition within the images, 3) reprojecting the 2D data along that direction to determine the line spread function (LSF), and 4) Fourier transforming of the LSF. The results demonstrate that the methodology produces reproducible results in the orthogonal directions and is sensitive to the resolution setting of the display device. The instrumentation needed for the method is portable and can easily be utilized in a clinical setting.
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Ehsan Samei, Michael J. Flynn, "Method for in-field evaluation of the modulation transfer function of electronic display devices", Proc. SPIE 4319, Medical Imaging 2001: Visualization, Display, and Image-Guided Procedures, (28 May 2001); doi: 10.1117/12.428105; https://doi.org/10.1117/12.428105
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KEYWORDS
Modulation transfer functions

Cameras

CRTs

CCD cameras

Optical resolution

Charge-coupled devices

Calibration

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