Improved measurement of dynamic modulation transfer functions on display using pursuit camera method based on wavelet-denoising method |
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| Authors: | Shau-Wei Hsu Chia-Ying Chang Zong-Ying Chung and Kuei-Neng Wu |
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| Institution: | (1) Department of Radiology, Vienna General Hospital, University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria;(2) Ludwig Boltzmann Institute of Radiodiagnostics, University of Vienna, Vienna, Austria |
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| Abstract: | A new method was developed for studying dynamic modulation transfer functions (DMTFs) of liquid crystal display (LCD) based
on the slanted edge method, improved wavelet-denoise (IWD) method, and Fourier transformation. Measurements were made for
capturing the images of moving step-edge patterns on the display by a slightly tilted pursuit camera. The scanning-rate and
contrast-dependent DMTFs of a LCD were demonstrated, and the corresponding parameters such as blurred edge width (BEW), spatial
sharpness, and motion picture response time (MPRT) were calculated from the DMTF curves. A simple linear relationship between
these parameters was found. The properties of a cathode ray tube (CRT) display were also measured for comparison with those
of the LCD. |
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