Measurements of the azimuthal distributions of very low‐frequency noise with high resolution in a shallow water site in the Mediterranean

1993 ◽  
Vol 94 (3) ◽  
pp. 1820-1820
Author(s):  
Bruce K. Newhall
Keyword(s):  
High Resolution ◽  
Shallow Water ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Very Low Frequency ◽  
The Mediterranean

scholarly journals A Novel Approach of Low-Light Image Denoising for Face Recognition

2014 ◽  
Vol 6 ◽  
pp. 256790
Author(s):  
Yimei Kang ◽  
Wang Pan
Keyword(s):  
Face Recognition ◽  
Image Denoising ◽  
Recognition Rate ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Face Database ◽  
Low Light ◽  
Very Low Frequency ◽  
Light Image

Illumination variation makes automatic face recognition a challenging task, especially in low light environments. A very simple and efficient novel low-light image denoising of low frequency noise (DeLFN) is proposed. The noise frequency distribution of low-light images is presented based on massive experimental results. The low and very low frequency noise are dominant in low light conditions. DeLFN is a three-level image denoising method. The first level denoises mixed noises by histogram equalization (HE) to improve overall contrast. The second level denoises low frequency noise by logarithmic transformation (LOG) to enhance the image detail. The third level denoises residual very low frequency noise by high-pass filtering to recover more features of the true images. The PCA (Principal Component Analysis) recognition method is applied to test recognition rate of the preprocessed face images with DeLFN. DeLFN are compared with several representative illumination preprocessing methods on the Yale Face Database B, the Extended Yale face database B, and the CMU PIE face database, respectively. DeLFN not only outperformed other algorithms in improving visual quality and face recognition rate, but also is simpler and computationally efficient for real time applications.

Investigation of Very Low-Frequency Noise in Ferromagnetic Nickel Nanowires

2009 ◽  
Vol 9 (9) ◽  
pp. 5243-5247 ◽  
Author(s):  
Sudeshna Samanta ◽  
M. Venkata Kamalakar ◽  
A. K. Raychaudhuri
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Very Low Frequency ◽  
Nickel Nanowires

The quasi-periodic oscillations and very low frequency noise of Scorpius X-1 as transient chaos - A dripping handrail?

1993 ◽  
Vol 411 ◽  
pp. L91 ◽  
Author(s):  
Jeffrey D. Scargle ◽  
Thomas Steiman-Cameron ◽  
Karl Young ◽  
David L. Donoho ◽  
James P. Crutchfield ◽  
...  
Keyword(s):  
Low Frequency ◽  
Transient Chaos ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Periodic Oscillations ◽  
Very Low Frequency

Control of very low frequency noise in launch vehicle payload fairings

2000 ◽  
Author(s):  
A. Hersh ◽  
B. Walker ◽  
J. Celano ◽  
H. Osman ◽  
C. Mitchell
Keyword(s):  
Low Frequency ◽  
Launch Vehicle ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Very Low Frequency

Low-frequency noise stabilization in optomechanical inertial accelerometers for high-resolution sensing

2020 ◽  
Author(s):  
Jaime Gonzalo Flor Flores ◽  
Wengting Wang ◽  
Yongjun Huang ◽  
Jiagui Wu ◽  
Talha Yerebakan ◽  
...  
Keyword(s):  
High Resolution ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise
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