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High dynamic range

About: High dynamic range is a research topic. Over the lifetime, 4280 publications have been published within this topic receiving 76293 citations. The topic is also known as: HDR.


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Proceedings ArticleDOI
TL;DR: In this paper, a low noise CMOS focal point readout circuit with ultra-high charge handling capacity is presented for high-background, VLWIR detector readout, each readout unit cell use an accurate dynamic current memory for automatic subtraction of the dark pedestal in current domain enabling measurement of small signals 85 dB below the dark level.
Abstract: Design and operation of a low noise CMOS focal pa;ne readout circuit with ultra-high charge handling capacity is presented. Designed for high-background, VLWIR detector readout, each readout unit cell use an accurate dynamic current memory for automatic subtraction of the dark pedestal in current domain enabling measurement of small signals 85 dB below the dark level. The redout circuit operates with low-power dissipation, high linearity, and is capable of handling pedestal currents up to 300 nA. Measurements indicate an effective charge handling capacity of over 5 X 109 charges/pixel with less than 105 electrons of input referred noise.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

26 citations

Patent
23 Aug 1995
TL;DR: In this paper, a double-double-balanced mixer is proposed to provide high dynamic range, strong suppression of intermodulation products, low conversion loss, and low local oscillator input power.
Abstract: A double-double-balanced mixer includes first and second radio frequency baluns and first and second local oscillator baluns formed on a dielectric substrate and connected to two diode rings. An intermediate frequency port is also connected to two diode rings. The particular dimensions of the stripline mixer are carefully selected to provide high dynamic range, strong suppression of intermodulation products, low conversion loss, and low local oscillator input power. The specific design dimensions of the mixer are selected contrary to conventional mixer design principle. For example, the local oscillator and radio frequency balun microstrips are designed to have a length which is considerably less than one-quarter wavelength of the LO and RF frequencies.

26 citations

Journal ArticleDOI
TL;DR: In this article, a single-photon detector can be used in time domain for high-dynamic-range applications such as surveillance and security imaging, quantum computing, and biomedical imaging including bioluminescence and fluorescence lifetime imaging.
Abstract: Avalanche photodiodes used in Geiger mode as single-photon counters have become very attractive imaging tools. High-speed single-photon imaging can be used in very low-light-level applications such as surveillance and security imaging, quantum computing, and biomedical imaging including bioluminescence and fluorescence lifetime imaging. However, a typical avalanche-based single-photon detector cannot offer the high dynamic range that is needed for many biomedical and surveillance applications. In this paper, we show how a single-photon detector can be used in time domain for high-dynamic-range applications. We also discuss novel techniques to implement the time-domain single-photon imager in mainstream deep-submicrometer CMOS technology. The designed imager offers high dynamic range and high sensitivity, while maintaining high-speed operation and low cost.

26 citations

Journal ArticleDOI
TL;DR: The "Automated Imaging Routine for Compact Arrays for the Radio Sun (AIRCARS)", an end-to-end imaging pipeline optimized for solar imaging with arrays with a compact core, has the potential to transform the multi-petabyte MWA solar archive from raw visibilities into science-ready images.
Abstract: Solar radio emission, especially at metre-wavelengths, is well known to vary over small spectral ($\lesssim$100\,kHz) and temporal ($<1$\,s) spans. It is comparatively recently, with the advent of a new generation of instruments, that it has become possible to capture data with sufficient resolution (temporal, spectral and angular) that one can begin to characterize the solar morphology simultaneously along the axes of time and frequency. This ability is naturally accompanied by an enormous increase in data volumes and computational burden, a problem which will only become more acute with the next generation of instruments such as the Square Kilometre Array (SKA). The usual approach, which requires manual guidance of the calibration process, is impractical. Here we present the "Automated Imaging Routine for Compact Arrays for the Radio Sun (AIRCARS)", an end-to-end imaging pipeline optimized for solar imaging with arrays with a compact core. We have used AIRCARS so far on data from the Murchison Widefield Array (MWA) Phase-I. The dynamic range of the images is routinely from a few hundred to a few thousand. In the few cases, where we have pushed AIRCARS to its limits, the dynamic range can go as high as $\sim$75000. The images made represent a substantial improvement in the state-of-the-art in terms of imaging fidelity and dynamic range. This has the potential to transform the multi-petabyte MWA solar archive from raw visibilities into science-ready images. AIRCARS can also be tuned to upcoming telescopes like the SKA, making it a very useful tool for the heliophysics community.

26 citations

Journal ArticleDOI
01 May 2008
TL;DR: Multi-layer display as discussed by the authors is a new concept in display technology that utilizes two or more displays in series and applications are aimed at enhanced depth, that is 3D effects, expanded color, greatly increased contrast ratio, and high dynamic range.
Abstract: A new concept in display technology that utilizes two or more displays in series has been developed and commercialized; applications are aimed at enhanced depth, that is 3D effects, expanded color, greatly increased contrast ratio, and high dynamic range. The principles of operation will be described for the various approaches to multi layer display and examples of first uses will be shown.

26 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023122
2022263
2021164
2020243
2019238
2018262