Theoretical demonstration of image characteristics and image formation process depending on image displaying conditions on liquid crystal display

Asumi Yamazaki; Katsuhiro Ichikawa; Masao Funahashi; Yoshie Kodera

doi:10.1117/12.910702

22 February 2012 Theoretical demonstration of image characteristics and image formation process depending on image displaying conditions on liquid crystal display

Asumi Yamazaki, Katsuhiro Ichikawa, Masao Funahashi, Yoshie Kodera

Author Affiliations +

Proceedings Volume 8318, Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment; 83181R (2012) https://doi.org/10.1117/12.910702
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

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.

Citation Download Citation

Asumi Yamazaki, Katsuhiro Ichikawa, Masao Funahashi, and Yoshie Kodera "Theoretical demonstration of image characteristics and image formation process depending on image displaying conditions on liquid crystal display", Proc. SPIE 8318, Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment, 83181R (22 February 2012); https://doi.org/10.1117/12.910702

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