Results 241 to 250 of about 14,244,062 (276)

Progressive Sub-Aperture Image Recovery for Interactive Light Field Data Streaming

2018 25th IEEE International Conference on Image Processing (ICIP), 2018
Due to the large size of a light field image, compressing and transmitting the entire data to a client before rendering any image for observation would incur a significant startup delay. In response, in interactive light field streaming (ILFS) a server synthesizes and transmits a new viewpoint image as a combination of sub-aperture images (SAIs) per ...
Eduardo Peixoto, Bruno Macchiavello, Edson Mintsu Hung, Gene Cheung   +3 more
openaire   +1 more source

Visualization of specular reflections with phase coherence imaging using sub-apertures

Ultrasonics
In recent years, phased array ultrasonic testing (PAUT) has gradually been substituted by approaches such as the Total Focusing Method (TFM), which use the Full Matrix Capture (FMC) acquisition scheme. Phase Coherence Imaging (PCI) has been proposed to mitigate the problems associated with amplitude-based TFM.
Tony Rasolonirina, Guillaume Painchaud-April, Alain Le Duff, Pierre Bélanger   +3 more
openaire   +2 more sources

Target Detection In Sar Images Based On Sub-Aperture Coherence And Phase Congruency

Intelligent Automation & Soft Computing, 2012
Abstract For target detection in SAR images, the sub-aperture coherence analysis is employed widely by calculating coefficient of coherence to express the differences of the target signals in sub-aperture images. However the calculation of coherence coefficients is non-adaptive so that when the amplitude difference of coherence coefficient between a ...
Zhen Zhang 0019, Xin Wang, Lizhong Xu
openaire   +1 more source

Bistatic ISAR Image Fusion With Sub-aperture Based Parameter Estimation

IET International Radar Conference 2013, 2013
A bistatic inverse synthetic aperture radar (Bi-ISAR) system can receive echoes from different observation angles simultaneously, thus an image with higher signal-to-noise ratio (SNR) and more abundant information of a certain target can be obtained by fusing the two images attained by the two distributed receivers. However, the geometrically dependent
null Ran Xu, null Yachao Li, null Peng Shao, null Mengdao Xing   +3 more
openaire   +1 more source

Study on Optical Synthetic Aperture Imaging System with Seven Sub-Apertures

2010 Symposium on Photonics and Optoelectronics, 2010
Space optical technique is a key research issue of space technique. Along with the development of earth observation and space exploration, requirements of observation accuracy and resolution capability is becoming higher and stricter. Traditional optical systems could hardly satisfy demands of modern optical remote sensing.
Jing Guo, Chun-ping Yang, Mei-ling Kang, Yan Zhang, Jian Wu, Yu-tang Ye   +5 more
openaire   +1 more source

Improved image reconstruction from sub-apertures of circular spotlight SAR

SPIE Proceedings, 2015
Reconstructing images from SAR returns is usually a time consuming task. In addition it is often desired to use as many returns as possible to achieve better image quality. However, the high computational resources demand by the conventional methods hinders the reconstruction process. In this article, we propose a simple method to reconstruct SAR image
Xiaohui Yuan, Igor Ternovskiy
openaire   +1 more source

Imaging with an array of adaptive subapertures

Optics Letters, 2007
An imaging system composed of an array of adaptive optics subapertures referred to as a conformal imaging system is considered. A conformal image of an object viewed through atmospheric turbulence is obtained using the following sequential steps: adaptive compensation of phase distortions through optimization of image quality metrics at each ...
Aubailly, Mathieu, Vorontsov, Mikhail
openaire   +3 more sources

Passive GNSS-based SAR imaging with sub-apertures combination

Signal, Image and Video Processing, 2022
Yu Zheng, Zhuxian Zhang, Peidong Zhu, Bo Yang, Peng Wu   +4 more
openaire   +1 more source

Image revivals in multi-mode optical fibers with periodic multiple sub-apertures

Optics Communications, 2014
Abstract We report experiments on a multi-mode fiber-based device that reimages the input pattern after specific propagation distances. The reimaging has two propagation length scales related to the Talbot self-imaging in a periodic grating and image revival effects.
Wang, Long, Powers, Peter E., Sarangan, Andrew, Haus, Joseph W.   +3 more
openaire   +2 more sources

The sub-aperture range-doppler imaging algorithms for bistatic SAR of arbitrary mode

2007 1st Asian and Pacific Conference on Synthetic Aperture Radar, 2007
In the bistatic synthetic aperture radar systerm, the Doppler frequency is determined by both transmitter and receiver motion. The bistatic SAR has many advantages on the military affairs, but it also pays the price for system and imaging complexity. The bistatic SAR of arbitary mode lies more smart, thus more complex.
An Chen, Jingen Wang, Yanyu Wang
openaire   +1 more source