Results 111 to 120 of about 477 (145)

Noise transfer in variable‐depth streamer deghosting

Geophysical Prospecting, 2016
ABSTRACTSingle‐component towed‐streamer marine data acquisition records the pressure variations of the upgoing compressional waves followed by the polarity‐reversed pressure variations of downgoing waves, creating sea‐surface ghost events in the data.
Ferber, Ralf, van Manen, Dirk-Jan
openaire   +2 more sources

Fast Image Blending and Deghosting for Panoramic Video

2013 Ninth International Conference on Intelligent Information Hiding and Multimedia Signal Processing, 2013
The technology of panoramic image construction is widely used in many conditions. As the increasingly demand of monitoring system application, the attribute of real-time is more important during the panoramic construction. This paper describes a method of fast building panoramic video and output frames in real-time.
Chen-Hong Yuan, Jeng-Shyang Pan 0001, Ming-Hwa Sheu, Tzu-Hsiung Chen   +3 more
openaire   +1 more source

Deghosting and its Effect on Noise

Proceedings, 2017
Summary In marine seismic the ghost wavefield results in deep notches in the broadband frequency spectrum corresponding to the depth of the sources and detectors with respect to the sea surface. An inverse filter is used to remove these ghost effects. Application this filter has the consequence that the notch areas are amplified.
J.-W. Vrolijk, G.J. Blacquière
openaire   +1 more source

On seismic deghosting by spatial deconvolution

Geophysics, 2013
ABSTRACT Receiver-side deghosting can be derived and implemented in the frequency domain as spatial deterministic deconvolution of marine pressure recordings. The deghosting/deconvolution operator is found analytically as the inverse Fourier transform of the wavenumber-domain wave equation deghosting function.
Lasse Amundsen, Hongbo Zhou, Arne Reitan, Arthur B. Weglein   +3 more
openaire   +1 more source

Optimal Deghosting Algorithm - A Robust Deghosting Approach for Over/Under Towed-streamer Data

70th EAGE Conference and Exhibition incorporating SPE EUROPEC 2008, 2008
Over/under acquisition provides broadband data at all frequencies by combining the advantages of shallow and deep cable depths. These benefits are achieved by using data processing algorithms that combine data from the over/under cables into a single dataset.
A. K. Özdemir, A. Ozbek, P. Caprioli, J. Robertsson, E. Kragh   +4 more
openaire   +1 more source

HDR Deghosting: How to Deal with Saturation?

2013 IEEE Conference on Computer Vision and Pattern Recognition, 2013
We present a novel method for aligning images in an HDR (high-dynamic-range) image stack to produce a new exposure stack where all the images are aligned and appear as if they were taken simultaneously, even in the case of highly dynamic scenes. Our method produces plausible results even where the image used as a reference is either too dark or bright ...
Jun Hu 0007, Orazio Gallo, Kari Pulli, Xiaobai Sun   +3 more
openaire   +1 more source

Television signal deghosting by noncausal recursive filtering

ICASSP-88., International Conference on Acoustics, Speech, and Signal Processing, 2003
A signal corrupted by a ghosting channel can be deghosted by the appropriate inverse system. If the channel is nonminimum-phase, the inverse system has a noncausal impulse response. It is pointed out that the inverse system can be implemented with recursive digital filters, provided there are system elements to time-flip the signal.
Dan Harasty, Alan V. Oppenheim
openaire   +1 more source

3C Deghosting for Refraction Time-lapse Monitoring

Proceedings, 2013
Summary Refraction time-lapse monitoring provides affordable areal measurements of reservoir changes using waves that travel from sources along a fast layer underlying the reservoir. When the waves exit the fast layer, they travel through the reservoir and propagate to the receivers, with corresponding arrival times depending on the state of the ...
P. B Wills, K. De Meersman
openaire   +1 more source

Perceptual quality assessment of HDR deghosting algorithms

2017 IEEE International Conference on Image Processing (ICIP), 2017
High dynamic range (HDR) imaging techniques aim to extend the dynamic range of images that cannot be well captured using conventional camera sensors. A common practice is to take a stack of pictures with different exposure levels and fuse them to produce a final image with more details.
Yuming Fang, Hanwei Zhu, Kede Ma
exaly   +2 more sources

Patch-Based correlation for deghosting in exposure fusion

Information Sciences, 2017
Abstract We present a robust exposure fusion algorithm to tackle the problems of motion removal and detail preserving in dynamic scenes. Using one exposure as a reference, the algorithm detects motion in an exposure stack by comparing the structural consistency of images as measured by the degree of linear correlation between patches of each image ...
Wei Zhang 0021, Shengnan Hu, Kan Liu 0001   +2 more
openaire   +1 more source