Evaluation of image quality characteristics of reduction image in high resolution liquid crystal display

Yukiyoshi Kimura; Daigo Yokoyama; Naotoshi Fujita; Yoshie Kodera

doi:10.1117/12.877961

15 March 2011 Evaluation of image quality characteristics of reduction image in high resolution liquid crystal display

Yukiyoshi Kimura, Daigo Yokoyama, Naotoshi Fujita, Yoshie Kodera

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Proceedings Volume 7965, Medical Imaging 2011: Biomedical Applications in Molecular, Structural, and Functional Imaging; 796526 (2011) https://doi.org/10.1117/12.877961
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

Abstract

With recent developments, digital mammograms can be obtained with a small pixel size, i.e., high resolution; however, the matrix size increases. Therefore, when the image is thinned out, image information is lost when the image is displayed on a liquid crystal display (LCD). To resolve this issue, we have developed a super high resolution liquid crystal display (SHR-LCD) by using a novel resolution enhancement technology for independent subpixel driving (ISD) with three subpixels in each pixel element. However, the lack of image information caused by thinning of the image cannot be ignored because the matrix size of a phase contrast mammogram (PCM) is very large as compared to that of a conventional mammogram. We obtained noise and edge images by using the geometrical layouts of the PCM (7080 x 9480). We measured the Wiener spectrum (WS), modulation transfer function (MTF), and noise-equivalent number of quanta (NEQ) of the images reduced by the nearest-neighbor, bilinear, and bicubic (sharpness and smooth) interpolations. The reduction rate was approximately 0.14. We measured the WS and MTF when the PCM image was displayed on a 5-megapixel (MP) and 15-MP LCD. The bilinear interpolation technique gave the best image quality. The image quality was further improved by using a 15-MP SHR-LCD.

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Yukiyoshi Kimura, Daigo Yokoyama, Naotoshi Fujita, and Yoshie Kodera "Evaluation of image quality characteristics of reduction image in high resolution liquid crystal display", Proc. SPIE 7965, Medical Imaging 2011: Biomedical Applications in Molecular, Structural, and Functional Imaging, 796526 (15 March 2011); https://doi.org/10.1117/12.877961

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KEYWORDS

LCDs

Modulation transfer functions

Image quality

Image resolution

Mammography

Optical resolution

Spatial frequencies

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