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Optical image processing with liquid‐crystal display for image intensifier/television systems
Author(s) -
Lam Kwok Leung,
Chan HeangPing,
Doi Kunio
Publication year - 1988
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596199
Subject(s) - image intensifier , liquid crystal display , dynamic range , optics , professional video camera , image processing , computer science , noise (video) , phosphor , signal (programming language) , materials science , computer vision , artificial intelligence , high definition television , image (mathematics) , physics , optoelectronics , telecommunications , programming language
We have studied the effect of real‐time optical image processing (OIP) in an image intensifier/television (II–TV) radiographic imaging system by using a liquid‐crystal display (LCD) placed between the II and the TV camera. The LCD compresses the dynamic range of the transmitted image by modulating the spatial distribution of the light intensity of the image from the output phosphor of the II. The degree of dynamic‐range compression can be designed so that the dependence of the signal‐to‐noise ratio (SNR) of the LCD–TV system on x‐ray intensity matches that of the quantum noise. We measured the physical properties of an LCD and evaluated its capability for OIP. Our experimental results demonstrate that it is feasible to use an LCD to compress the dynamic range and to improve the SNR of the image. The advantages of implementing OIP with an LCD in image acquisition systems in which a TV camera is used are discussed.