Research on LIFT Technology for 3D Seismic Denoising in Coalfield

The LIFT technology has applied in process of denoising to ensure the imaging precision of minor faults and structure in 3D coalfield seismic processing. The paper focused on the denoising process in two study areas where the LIFT technology is used. The separation of signal and noise is done firstly. Then denoising would be done in the noise data. The Data of weak effective signal that is from the noise data could be blended with the original effective signal to reconstruct the denoising data, so the result which has high signal-to-noise ratio and preserved amplitude is acquired. Thus the fact shows that LIFT is an effective denoising method for 3D seismic in coalfield and could be used widely in other work area.

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Recent Results on Abundance Determinations

International Astronomical Union Colloquium ◽

10.1017/s0252921100020273 ◽

1993 ◽

Vol 138 ◽

pp. 27-41

Author(s):

Saul J. Adelman

Keyword(s):

Signal To Noise Ratio ◽

Model Atmosphere ◽

Bulletin Board ◽

High Signal ◽

Rotating Stars ◽

Signal To Noise ◽

Peculiar Stars ◽

Noise Data ◽

Noise Ratio ◽

Moving Groups

AbstractI review abundance determinations of normal B5-F4 and peculiar stars published since 1984. Several analyses performed with photographic spectrograms indicate interesting stars which should be analyzed with high signal-to-noise data. Studies of stars of known ages which belong to clusters, associations, and moving groups should led to the most direct confrontations with theory. The increase in signal-to-noise ratio provided by electronic detectors with respect to photographic plates should allow accurate analyses of moderating rotating stars. High resolution, high signal-to-noise ratio studies have revealed crucial information about the line profiles of Sirius, Vega, and other A stars. It would aid comparison of analyses if we could agree on a standard set of gf-values and line damping constants. A computer bulletin board would be a useful means to provide and maintain such data as well as model atmosphere codes.

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Comparison between Mean Filter and Median Filter Algorithm in Image Denoising Field

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.644-650.4112 ◽

2014 ◽

Vol 644-650 ◽

pp. 4112-4116 ◽

Cited By ~ 2

Author(s):

Xiao Xin Sun ◽

Wei Qu

Keyword(s):

Image Denoising ◽

Signal To Noise Ratio ◽

Median Filter ◽

Response Characteristic ◽

Fast Response ◽

High Signal ◽

Signal To Noise ◽

Denoising Method ◽

Mean Filter ◽

Noise Ratio

An image denoising method based on spatial filtering is proposed on order to overcoming the shortcomings of traditional denoising methods in this paper. The method combined mean mask algorithm with median filtering technique is able to replace the gray values of noisy image pixel by the mean or median value in its neighborhood mask matrix and highlight the characteristic value of the image. Peak signal to noise ratio and mean square error are used as the evaluation index in this method and comparison between mean filter and median filter is done. The experimental results show that this denoising system makes the images have a high signal to noise ratio and integrity of edge details and take into account real-time, and fast response characteristic of the system.

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Narrow-frequency sharp-angular filters using all-dielectric cascaded meta-gratings

Nanophotonics ◽

10.1515/nanoph-2020-0141 ◽

2020 ◽

Vol 9 (10) ◽

pp. 3443-3450 ◽

Cited By ~ 1

Author(s):

Wei-Nan Liu ◽

Rui Chen ◽

Wei-Yi Shi ◽

Ke-Bo Zeng ◽

Fu-Li Zhao ◽

...

Keyword(s):

Thin Film ◽

Signal To Noise Ratio ◽

Incident Angle ◽

Design Strategy ◽

Transmission Peak ◽

High Signal ◽

Waveguide Array ◽

Signal To Noise ◽

Center Wavelength ◽

Noise Ratio

AbstractSelective transmission or filtering always responds to either frequency or incident angle, so as hardly to maximize signal-to-noise ratio in communication, detection and sensing. Here, we propose compact meta-filters of narrow-frequency sharp-angular transmission peak along with broad omnidirectional reflection sidebands, in all-dielectric cascaded subwavelength meta-gratings. The inherent collective resonance of waveguide-array modes and thin film approximation of meta-grating are employed as the design strategy. A unity transmission peak, locating at the incident angle of 44.4° and the center wavelength of 1550 nm, is demonstrated in a silicon meta-filter consisting of two-layer silicon rectangular meta-grating. These findings provide possibilities in cascaded meta-gratings spectroscopic design and alternative utilities for high signal-to-noise ratio applications in focus-free spatial filtering and anti-noise systems in telecommunications.

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