scholarly journals Going far beyond the near-field diffraction limit via plasmonic cavity lens with high spatial frequency spectrum off-axis illumination

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Zeyu Zhao ◽  
Yunfei Luo ◽  
Wei Zhang ◽  
Changtao Wang ◽  
Ping Gao ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Frequency Spectrum ◽  
Near Field ◽  
High Spatial Frequency ◽  
Diffraction Limit ◽  
Spatial Frequency Spectrum

scholarly journals Sharpening coarse-to-fine stereo vision by perceptual learning: asymmetric transfer across the spatial frequency spectrum

2016 ◽  
Vol 3 (1) ◽  
pp. 150523 ◽  
Author(s):  
Roger W. Li ◽  
Truyet T. Tran ◽  
Ashley P. Craven ◽  
Tsz-Wing Leung ◽  
Sandy W. Chat ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Perceptual Learning ◽  
Frequency Spectrum ◽  
Three Dimensional ◽  
High Spatial Frequency ◽  
Visual Image ◽  
Spatial Frequencies ◽  
Early Visual Cortex ◽  
Coarse To Fine ◽  
Spatial Frequency Spectrum

Neurons in the early visual cortex are finely tuned to different low-level visual features, forming a multi-channel system analysing the visual image formed on the retina in a parallel manner. However, little is known about the potential ‘cross-talk’ among these channels. Here, we systematically investigated whether stereoacuity, over a large range of target spatial frequencies, can be enhanced by perceptual learning. Using narrow-band visual stimuli, we found that practice with coarse (low spatial frequency) targets substantially improves performance, and that the improvement spreads from coarse to fine (high spatial frequency) three-dimensional perception, generalizing broadly across untrained spatial frequencies and orientations. Notably, we observed an asymmetric transfer of learning across the spatial frequency spectrum. The bandwidth of transfer was broader when training was at a high spatial frequency than at a low spatial frequency. Stereoacuity training is most beneficial when trained with fine targets. This broad transfer of stereoacuity learning contrasts with the highly specific learning reported for other basic visual functions. We also revealed strategies to boost learning outcomes ‘beyond-the-plateau’. Our investigations contribute to understanding the functional properties of the network subserving stereovision. The ability to generalize may provide a key principle for restoring impaired binocular vision in clinical situations.

Contrast Sensitivity and Spatial-Frequency Spectrum After Refractive Surgery

2003 ◽  
Vol 29 (9) ◽  
pp. 1650-1651 ◽  
Author(s):  
Robert Montés-Micó ◽  
Jorge L. Alió ◽  
Gonzalo Muñoz
Keyword(s):  
Spatial Frequency ◽  
Contrast Sensitivity ◽  
Frequency Spectrum ◽  
Refractive Surgery ◽  
Spatial Frequency Spectrum

Evolution of the spatial frequency spectrum of the scattering in the region of the 3S–3Ptransition in sodium vapor

1987 ◽  
Vol 17 (8) ◽  
pp. 1078-1080 ◽  
Author(s):  
A A Afanas'ev ◽  
V I Vaĭchaĭtis ◽  
M V Ignatavichyus ◽  
V A Kudryashov ◽  
Yu N Pimenov ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Frequency Spectrum ◽  
Sodium Vapor ◽  
Spatial Frequency Spectrum

Probing the spatial frequency spectrum for orientation sensitivity in stochastic textures

1983 ◽  
Vol 23 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Terry Caelli ◽  
Paul Bevan
Keyword(s):  
Spatial Frequency ◽  
Frequency Spectrum ◽  
Orientation Sensitivity ◽  
Spatial Frequency Spectrum

scholarly journals Role of the illumination spatial-frequency spectrum for ptychography

2012 ◽  
Vol 86 (10) ◽  
Author(s):  
Manuel Guizar-Sicairos ◽  
Mirko Holler ◽  
Ana Diaz ◽  
Joan Vila-Comamala ◽  
Oliver Bunk ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Frequency Spectrum ◽  
Spatial Frequency Spectrum

Calculating and matching the spatial frequency spectrum for recording quasi-fourier holograms on photothermoplastic media

2006 ◽  
Vol 73 (1) ◽  
pp. 136-141
Author(s):  
S. N. Zhdanovich ◽  
V. F. Yarmolitskii ◽  
A. I. Konoiko
Keyword(s):  
Spatial Frequency ◽  
Frequency Spectrum ◽  
Spatial Frequency Spectrum

Optical Metrology Systems Spanning the Full Spatial Frequency Spectrum

2016 ◽  
Author(s):  
Dae Wook Kim ◽  
Maham Aftab ◽  
Heejoo Choi ◽  
Logan Graves ◽  
Isaac Trumper
Keyword(s):  
Spatial Frequency ◽  
Frequency Spectrum ◽  
Optical Metrology ◽  
Spatial Frequency Spectrum

Extension of spatial-frequency spectrum in rainbow holography with a synthesized slit

1992 ◽  
Vol 9 (9) ◽  
pp. 1592
Author(s):  
Gengxing Yang ◽  
Songsheng Chen ◽  
Zhengming Yang
Keyword(s):  
Spatial Frequency ◽  
Frequency Spectrum ◽  
Spatial Frequency Spectrum
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