Results 31 to 40 of about 233,212 (303)

Modulation transfer functions for audiovisual speech

open access: yesPLOS Computational Biology, 2022
Temporal synchrony between facial motion and acoustic modulations is a hallmark feature of audiovisual speech. The moving face and mouth during natural speech is known to be correlated with low-frequency acoustic envelope fluctuations (below 10 Hz), but the precise rates at which envelope information is synchronized with motion in different parts of ...
Nicolai Pedersen   +3 more
openaire   +5 more sources

Modulation transfer function of the thermal imaging monocular

open access: yesVìsnik Nacìonalʹnogo Tehnìčnogo Unìversitetu Ukraïni Kììvsʹkij Polìtehnìčnij Ìnstitut: Serìâ Radìotehnìka, Radìoaparatobuduvannâ, 2019
The modulation transfer function (MTF) of thermal imaging monocular (TIM) was investigated in this article. TIM consists of a lens, a microbolometric matrix (MBM), an electronic system of video signal amplification and processing, a micro display and an ...
V. H. Kolobrodov
doaj   +1 more source

Formation of a Fast Charge Transfer Channel in Quasi-2D Perovskite Solar Cells through External Electric Field Modulation

open access: yesEnergies, 2021
Quasi-2D perovskites solar cells exhibit excellent environmental stability, but relatively low photovoltaic properties, compared with 3D perovskites solar cells.
Xixiang Zhu   +4 more
doaj   +1 more source

Temporal modulation transfer functions in the European Starling (Sturnus vulgaris): II. Responses of auditory-nerve fibres [PDF]

open access: yes, 1995
The temporal resolution of cochlear-nerve fibres in the European starling was determined with sinusoidally amplitude-modulated noise stimuli similar to those previously used in a psychoacoustic study in this species (Klump and Okanoya, 1991).
Klump, Georg M.   +3 more
core   +1 more source

A phantom for the quantitative determination and improvement of the spatial resolution in slice-selective 2D-FT magnetic resonance micro-imaging and -microscopy based on Deep X-ray Lithography (DXRL)

open access: yesFrontiers in Physics, 2023
Introduction: The most important assessed quality-control (QC) criteria for improvements in high-resolution imaging are represented by the contrast-to-noise-ratio and spatial resolution.
Andreas Georg Berg   +3 more
doaj   +1 more source

Measurement of the point-spread function of a noisy imaging system [PDF]

open access: yes, 2007
The averaged point-spread function (PSF) estimation of an image acquisition system is important for many computer vision applications, including edge detection and depth from defocus. The paper compares several mathematical models of the PSF and presents
Richard C Staunton   +5 more
core   +1 more source

Theoretical evaluation of MTF and charge collection efficiency in CCD and CMOS image sensor [PDF]

open access: yes, 2009
Classical models used to calculate the Modulation Transfer function (MTF) of a solid-state image sensor generally use a sinusoidal type of illumination.
Olivier Saint-Pé   +11 more
core   +1 more source

Precoded Sphere Packing Aided Bit-Interleaved Differential Spa ce-Time Coded Modulation Using Iterative Decoding [PDF]

open access: yes, 2008
—In this treatise, we investigate a precoded and sphere packing (SP)-aided bit-interleaved differential space-time coded modulation scheme using iterative decoding. The amalgamated design and interworking of the SP, differential encoding, and iteratively
Alamri, Osamah   +3 more
core   +1 more source

Analysis of Edge Method Accuracy and Practical Multidirectional Modulation Transfer Function Measurement

open access: yesApplied Sciences, 2022
The modulation transfer function (MTF) is commonly used as an imaging quality criterion reflecting the spatial resolution capability of imaging systems. The modified edge methods based on ISO Standard 12233 are widely used in MTF measurement for various ...
Yongjie Wu   +3 more
doaj   +1 more source

General modulation transfer function fitting equation for human eye with contact lens

open access: yesKuwait Journal of Science, 2021
In this research, a general equation was derived to represent the modulation transfer function (MTF) of the human eye with the presence of the contact lenses (CL) and during the vision with monochrome or multi-wavelength (polychromatic) light.
Faten Shakor Zainulabdeen   +2 more
doaj   +1 more source

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