Results 261 to 270 of about 234,853 (303)

Modulation transfer function of water

OCEAN 75 Conference, 1975
Particulate matter of the sizes, concentrations, and refractive indices found in situ renders the Optical Transfer Function of water a real quantity. Modulation Transfer Function (MTF) is measured in vitro by spatial filtering of the projected image of a slit in the Fourier Transform plane.
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Modulation thresholds and temporal modulation transfer functions

The Journal of the Acoustical Society of America, 1976
Temporal Modulation Transfer Functions (TMTF's) were obtained by measuring the threshold amplitude of sinusoidal modulation as a function of modulating frequency. For modulation frequencies below approximately 800 Hz, TMTF's obtained with a continuous wide-band noise carrier generally show the low-pass characteristic reported previously [J. Acoust. Soc.
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Modulation Transfer Function and Contrast

2017
Imaging systems are used for transferring information from an object in the object plane to an image in the image plane. The quality of the optics in the optical system drives the quality of the final image. This quality is measured using the optical transfer function, which comprises the modulation transfer function and the phase transfer function ...
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Deriving the Coltman correction for transforming the bar transfer function to the optical transfer function (or the contrast transfer function to the modulation transfer function)

Applied Optics, 1998
The Coltman series for obtaining the optical transfer function from measurements of the bar transfer function is mathematically derived. The bar transfer function rather than the contrast transfer function is defined so that the relation remains valid when an image exhibits phase reversal.
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Temporal modulation transfer functions based upon modulation thresholds

The Journal of the Acoustical Society of America, 1979
The detectability of amplitude modulation in the absence of spectral cues provides a quantitative description of temporal resolution for steady-state signals with relatively small amplitude changes. Modulation thresholds for sinusoidally amplitude-modulated wideband noise were measured as a function of modulation frequency.
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modulation transfer function

2011
Stefano Pacifici, fernando garcía, Raymond Chieng   +2 more
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Aerosol Modulation Transfer Function

2017
As described in the previous two chapters, turbulence gives rise to image degradation as a result of wavefront tilt as well as random image detail displacement deriving from random changes in refractive index of the propagation channel. Because of the randomness, a statistical rather than deterministic approach characterizes turbulence.
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Turbulence Modulation Transfer Function

2017
There are basically two techniques used to correct for turbulence degradation. One is adaptive optics, whose purpose is to prevent turbulence-derived distortions from being recorded in the image. The other technique is image restoration using typically digital computers. In the latter case, turbulence-derived blur has already been recorded in the image
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Modulation Transfer Function

2015
Bernhard R. Brandl, Ramón Navarro, Christoph U. Keller   +2 more
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Point Spread Function and Modulation Transfer Function

2013
As stated in Sect. 3.5, the distribution of the ray density of the spot diagram formed in the image plane is called Point Spread Function (PSF). PSF plays an important role in the image formation theory, since it describes the impulse response of an optical system to a source point.
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