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Proceedings Paper

Theoretical demonstration of image characteristics and image formation process depending on image displaying conditions on liquid crystal display
Author(s): Asumi Yamazaki; Katsuhiro Ichikawa; Masao Funahashi; Yoshie Kodera
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Paper Abstract

In soft-copy diagnosis, medical images with a large number of matrices often need displaying of reduced images by subsampling processing. We analyzed overall image characteristics on a liquid crystal display (LCD) depending on the display condition. Specifically, we measured overall Wiener spectra (WS) of displayed X-ray images at the sub-sampling rates from pixel-by-pixel mode to 35 %. A used image viewer took image reductions by sub-sampling processing using bilinear interpolation. We also simulated overall WS from sub-sampled images by bilinear, super-sampling, and nearestneighbor interpolations. The measured and simulated results agreed well and demonstrated that overall noise characteristics were attributed to luminance-value fluctuation, sub-sampling effects, and inherent image characteristics of the LCD. Besides, we measured digital MTFs (modulation transfer functions) on center and shifted alignments from subsampled edge images as well as simulating WS. The WS and digital MTFs represented that the displaying of reduced images induced noise increments by aliasing errors and made it impossible to exhibit high-frequency signals. Furthermore, because super-sampling interpolation processed the image reductions more smoothly compared with bilinear interpolations, it resulted in lower WS and digital MTFs. Nearest-neighbor interpolation had almost no smoothing effect, so the WS and digital MTFs indicated the highest values.

Paper Details

Date Published: 22 February 2012
PDF: 13 pages
Proc. SPIE 8318, Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment, 83181R (22 February 2012); doi: 10.1117/12.910702
Show Author Affiliations
Asumi Yamazaki, Osaka General Medical Ctr. (Japan)
Graduate School of Medical Sciences, Nagoya Univ. (Japan)
Katsuhiro Ichikawa, Kanazawa Univ. (Japan)
Masao Funahashi, Osaka General Medical Ctr. (Japan)
Yoshie Kodera, Graduate School of Medical Sciences, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 8318:
Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment
Craig K. Abbey; Claudia R. Mello-Thoms, Editor(s)

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