Showing 1-25 of 17,001 resultsfor "Index Terms":Small Range
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Staggered SAR Range Ambiguity Suppression with Quasi-Orthogonal Signals
Sergey A. Kislyy;Vadim A. Kozlov;Ilya A. Kuzmin;Vadim K. Tsvetkov;Yury M. Meleshin;Konstantin S. Lyalin
2023 IEEE 24th International Conference of Young Professionals in Electron Devices and Materials (EDM)
Year: 2023 | Conference Paper |
Nowadays synthetic aperture radars (SAR) carried by airborne and small satellites are actively used during all-weather and noctidial observation missions of large-scale land and ocean areas. SAR swath size is directly dependent on the installed antenna size which set bounds to minimal carrier size and weight characteristics. Due to the cyclic varying of the emitted pulse repetition frequency, a st...Show More
Ground-based SAR, which uses a rotated antenna to form the synthesize aperture, is used to detect the small static objects on the ground. The high resolution image algorithm is proposed based on Range Doppler imaging method, and the range cell migration is analyzed. A range migration correction kernel function in azimuth frequency domain is formed based on the analysis of the formation of range mi...Show More
Display HDR Image using a Gain Map
2007 IEEE International Conference on Image Processing
Year: 2007 | Conference Paper |
In this paper, we present a novel method for the display of high dynamic range images. The new method first computes a gain map image using a computational approach inspired by a machine learning algorithm and sums the gain map and the original image together; it then linearly scales the sum image to fit the dynamic range of the display devices. Results are presented to demonstrate the effectivene...Show More
Single image-based ghost-free high dynamic range imaging using local histogram stretching and spatially-adaptive denoising
In this paper, we present a novel high dynamic range (HDR) imaging method using a single image. The existing multiple image-based HDR methods work only on condition that there is no camera and object movement when acquiring multiple, differently exposed low dynamic range (LDR) images. To overcome such an unrealistic restriction, we make three LDR images from a single input image using local histog...Show More
0.15 mm2, DC-70GHz, Graphene-Based Power Detector with Improved Sensitivity and Dynamic Range
Mohamed Saeed;Ahmed Hamed;Saad Qayyum;Zhenxing Wang;Mehrdad Shaygan;Daniel Neumaier;Renato Negra
2018 IEEE/MTT-S International Microwave Symposium - IMS
Year: 2018 | Conference Paper |
Cited by: Papers (8)
This paper presents a wideband, zero-biased power detector circuit based on metal-insulator-Graphene (MIG) diodes fabricated on quartz substrate. The wideband performance, outstanding tangential signal sensitivity (TSS) and dynamic range (DR) of the proposed detector are obtained by employing the diode's strong nonlinearity together with an artificial transmission line architecture. $\pmb{S_{11}}$...Show More
High dynamic range (HDR) image has larger luminance range than conventional low dynamic range (LDR) image, which is more consistent with human visual system (HVS). Recently, JPEG committee releases a new HDR image compression standard JPEG XT. It decomposes input HDR image into base layer and extension layer. However, this method doesn't make full use of HVS, causing waste of bits on imperceptible...Show More
Perceptual quality assessment of HDR deghosting algorithms
2017 IEEE International Conference on Image Processing (ICIP)
Year: 2017 | Conference Paper |
Cited by: Papers (4)
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. However, a small displacement between images caused by either camera or scene motion would void the benefits and...Show More
Degradation of Dynamic Range for Shielding Effectiveness Measurements Due to Long-Term Use of a Dual Vibrating Intrinsic Reverberation Chamber
This article presents the degradation effects of long-term use of a dual vibrating intrinsic reverberation chamber (dual VIRC) for shielding effectiveness (SE) measurements. At the beginning with a new fresh dual VIRC setup it is possible to achieve a very high dynamic range (DR) but the DR degrades due to long-term use of the dual VIRC. The effect of 10 years use of the dual VIRC on the DR is sho...Show More
In this paper a comparative study of LINC based amplifiers and LINC-like amplifiers designated herein as Mode- Multiplexing amplifiers is briefly reported. The latter technique uses a novel signal decomposition algorithm to enhance the power efficiency of the system. In addition it offers greater robustness to branch’s imbalance, which results into an extension of the dynamic range of the system. ...Show More
Impact of tone-mapping operators and viewing devices on visual quality of experience
Shaymaa Al-Juboori;Is-Haka Mkwawa;Lingfen Sun;Emmanuel Ifeachor
2016 IEEE International Conference on Communications (ICC)
Year: 2016 | Conference Paper |
Cited by: Papers (1)
The development of HDR imaging is seen as an important step towards improving the visual quality of experience (QoE) of the end user in many applications. In practice, Tone-mapping operators (TMOs) provide a useful means for converting a high dynamic range (HDR) image to a low dynamic range (LDR) image in order to achieve better visualization on standard displays. Although mobile devices are becom...Show More
Ambiguous Synthetic Aperture Radar Modes for Wide Swath Ship Monitoring and Digital Elevation Model Generation in a Single Pass
Michelangelo Villano;Nertjana Ustalli;Maxwell Nogueira Peixoto
IGARSS 2024 - 2024 IEEE International Geoscience and Remote Sensing Symposium
Year: 2024 | Conference Paper |
One relevant application of synthetic aperture radar (SAR) is ship monitoring. Conventional SAR modes, however, are limited in their ability to detect small ships over wide swaths (> 100 km) due to their low azimuth resolution. A novel SAR mode is presented in which the pulse repetition interval (PRI) is continuously varied and is much smaller than the minimum PRI imposed by the swath width, produ...Show More
New Technologies for Intelligent High-Resolution Sensing from Small Satellite Platforms: CREWSR and Video
W. Blackwell;C. Kataria;W. Moulder;S. C. Reising;V. Chandrasekar
IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium
Year: 2023 | Conference Paper |
There are current critical needs of NASA, NOAA, and other agencies carrying out Earth environmental monitoring for higher-performance observing systems (lower noise, finer resolution, broader coverage, etc.) but also smaller, lower-cost sensing platforms that offer flexibility in how they are deployed and used. To achieve these ambitions, it is necessary to consider the observing system, comprisin...Show More
Design of a Low-Cost Synthetic Aperture Radar for Continuous Ship Monitoring
2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS
Year: 2021 | Conference Paper |
Cited by: Papers (1)
Synthetic aperture radar (SAR) systems have unique imaging capabilities that are suitable for several Earth observation applications. This paper proposes a new concept for the design of a low-cost SAR for a single dedicated application, namely illegal vessel detection, that can be implemented using a small satellite and is characterized by reduced transmit power and high resolution. Minimum requir...Show More
Robust performance control of electrohydraulic actuators for electronic cam motion generation
This paper addresses digital control design and implementation for an electrohydraulic servo actuator used in electronic cam motion generation. The actuator dynamics, due to a broad range of motion trajectories, have different degrees of nonlinearity and are represented by a number of linear models with associated bounds of unmodeled dynamics. For each specified range of motion trajectories, a rob...Show More
High Efficiency, Ultra-High-Density Silicon Photomultipliers
Fabio Acerbi;Alberto Gola;Veronica Regazzoni;Giovanni Paternoster;Giacomo Borghi;Nicola Zorzi;Claudio Piemonte
Silicon photomultipliers (SiPMs) are arrays of many single-photon avalanche diodes (SPADs), all connected in parallel. Each SPAD is sensitive to a single photon. The SiPM output is proportional to the number of detected photons. These sensors are becoming more and more popular in different applications and they have been significantly improved over last years, decreasing the noise, increasing the ...Show More
IPIX radar small target detection in sea clutter based on local backscattering amplitude statistics
A new method for small target detection in sea clutter is proposed. This approach builds on the local backscattering amplitude statistics of IPIX radar datasets: calculating the maxima and standard deviation (STD) of backscattering amplitude of different range bins. It is found that the maximum amplitude of the range bin hosting a small target (RBHST) is much smaller than that of other range bins ...Show More
Radar dynamic range specification and measurement
2009 International Radar Conference "Surveillance for a Safer World" (RADAR 2009)
Year: 2009 | Conference Paper |
A large dynamic range and a matching spurious-free response are now common-place requirements for new high-performance radar systems. In addition resistance to high-level out-of-band electromagnetic interference (EMI) is an important consideration. The key radar subsystem determining these characteristics is the analog radar receiver and the analog-to-digital converters (ADC). A Babel of definitio...Show More
Multi-scale exposure fusion via gradient domain guided image filtering
2017 IEEE International Conference on Multimedia and Expo (ICME)
Year: 2017 | Conference Paper |
Cited by: Papers (84)
Multi-scale exposure fusion is an efficient way to fuse differently exposed low dynamic range (LDR) images of a high dynamic range (HDR) scene into a high quality LDR image directly. It can produce images with higher quality than single-scale exposure fusion, but has a risk of producing halo artifacts and cannot preserve details in brightest or darkest regions well in the fused image. In this pape...Show More
An integer tone mapping operation for HDR images in OpenEXR with denormalized numbers
Tatsuya Murofushi;Toshiyuki Dobashi;Masahiro Iwahashi;Hitoshi Kiya
2014 IEEE International Conference on Image Processing (ICIP)
Year: 2014 | Conference Paper |
Cited by: Papers (18)
We propose an integer tone mapping operator (TMO) for high dynamic range (HDR) images expressed in a floating-point data format. Two purposes are achieved by the proposed TMO. The first purpose is to implement a TMO with less memory space. The second purpose is to give an important step to realize a fixed-point TMO. The proposed TMO is available for HDR images in the OpenEXR format. The OpenEXR fo...Show More
A 34-dB Dynamic Range 0.7-mW Compact Switched-Capacitor Power Detector in 65-nm CMOS
This letter presents a wide dynamic range low power consumption power detector with a compact area in a 65-nm complementary metal-oxide-semiconductor (CMOS) process. The maximum detectable power of traditional power detector is limited due to the non-linearity of MOSFETs. This problem is solved by using P-type and N-type doped material (PN) junction diodes as switches that have a linear input-outp...Show More
Closed-form dynamic range expression of dual-electrode Mach-Zehnder modulator in radio-over-fiber WDM system
Journal of Lightwave Technology
Cited by: Papers (7)
A dual-electrode Mach-Zehnder modulator for modulating a single channel or multiple channels in wavelength-division multiplexing (WDM) radio-over-fiber systems has been studied and analyzed to determine the effect of bias shifting on the dynamic range (DR) of the modulator. A closed-form expression of a realistic DR as a function of systems' parameters and all main sources of noise at the receiver...Show More
Template based inter-layer prediction for high dynamic range scalable compression
2015 IEEE International Conference on Image Processing (ICIP)
Year: 2015 | Conference Paper |
This paper presents a scalable high dynamic range (HDR) image coding framework in which the base layer is a low dynamic range (LDR) version of the image that may have been generated by an arbitrary Tone Mapping Operator (TMO). Our method successfully handles the case of complex local TMOs thanks to a block-wise and non-linear approach. A novel template based Inter Layer Prediction (ILP) is designe...Show More
Automatic Gain Control for Enhanced HDR Performance on Audio
2020 IEEE 22nd International Workshop on Multimedia Signal Processing (MMSP)
Year: 2020 | Conference Paper |
Cited by: Papers (5)
We introduce a method to enhance the performance of the high dynamic range (HDR) technique on audio signals by automatically controlling the gains of the individual signal channels. Automatic gain control (AGC) compensates the receiver's dynamic range by ensuring that the incoming signal is contained within the desired range while the HDR utilizes these multi-channel gains to extend the dynamic ra...Show More
A local tone mapping operator for high dynamic range images
2011 Fourth International Conference on Modeling, Simulation and Applied Optimization
Year: 2011 | Conference Paper |
Cited by: Papers (2)
In this paper, we present a new tonemapping operator to display high dynamic range image onto conventional displayable devices and printers. In our work, a new tone map algorithm, derived from the Contrast Limited Adaptive histogram Equalization (CLAHE) technique is presented. Due to different luminance intervals could result in overlapped reaction on the limited response in limited response range...Show More
Parametrization of SiPM dynamic range contribution to energy resolution of scintillation light readout
2008 IEEE Nuclear Science Symposium Conference Record
Year: 2008 | Conference Paper |
Cited by: Papers (2)
SiPM performance dynamic range limitation and possible effect on energy resolution of scintillation light readout has been addressed. Device response has been parametrized in terms of signal dispersion. An expected value of 7% dispersion in SiPM signal response obtained with our parametrization compares with the 8.4% energy resolution observed at a 22Na spectra acquired using a small dynamic range...Show More
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