Light-reflection random-target method for measurement of the modulation transfer function of a digital video-camera

Pospíšil, Jiří; Jakubik, Peter; Machala, Lubomír

doi:10.1016/j.ijleo.2005.04.005

Cited by 1 publication

(2 citation statements)

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“…The PSD input is equal to unity, since we generated a random pattern with a uniform power spectral density. 3,[9][10][11] Consequently, the PSD input can be separated into frequencies and . The horizontal PSD input ͑ , ͒ is the = 0 profile of PSD input ͑ , ͒.…”

Section: Methodsmentioning

confidence: 99%

“…3 As examples, works in which laser speckle 4-7 and random-dot patterns are used as objects can be found in the literature. Random-dot patterns can be printed on transparencies 3,8 or paper targets, 9 and also can be generated with a liquid-crystal display ͑LCD͒ projector 10 or presented on the LCD of a laptop computer. 11 The former technique has major advantages over printout patterns on transparencies or white paper.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of spectacle-lens optical quality by modulation transfer function measurements based on random-dot patterns

2010

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We present a method for comparing the optical quality of spectacle lenses based on determining the modulation transfer function ͑MTF͒ using random-dot patterns. Furthermore, we determine the precision of the method under repeatability conditions of measurement. The experimental device is composed of a laptop computer in which the LCD monitor presents the random-dot pattern, a liquid-crystal tunable filter, the lens under test, and a charge-coupled device detector connected to its control card installed in another computer. The method proposed has major advantages: the lenses can be characterized at different wavelengths; no additional sources to illuminate the pattern are required, the monitor's lighting source itself is used; and the characteristics of the pattern can be quickly and easily modified, as we install the control software in the laptop computer. We analyze three spherical spectacle lenses ͑+5 D͒ from different manufacturers and, in terms of MTF, the greatest difference found between them is 13.7%. The uncertainty associated with this method falls within the range of 0.001 and 0.06. Given the low uncertainty values, differences found between the lenses are significant. Therefore, the method proposed is a versatile and quick technique to distinguish the optical quality of spectacle lenses from different manufacturers. © 2010Society of Photo-Optical Instrumentation Engineers.

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Section: Methodsmentioning

confidence: 99%