Topic
Dynamic range
About: Dynamic range is a research topic. Over the lifetime, 7576 publications have been published within this topic receiving 101739 citations. The topic is also known as: DNR & DR.
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TL;DR: In this paper, a new reduction procedure is described to correct data obtained by the Westerbork Synthesis Radio Telescope, which allows very high dynamic range mapping of strong radio sources by also using redundant interferometers.
Abstract: A new reduction procedure is described to correct data obtained by the Westerbork Synthesis Radio Telescope. The technique allows very high dynamic range mapping of strong radio sources by also using redundant interferometers. The performance is illustrated with 6-cm and 21-cm continuum maps of 3C84, which have a dynamic range of about 10,000:1.
82 citations
04 Jun 1990
TL;DR: In this article, the acceleration input-digital-output sigma-delta modulator accelerometer and the finite-element analysis of the mechanical structure are described, and performance obtained from prototype units is also presented.
Abstract: The acceleration input-digital-output sigma-delta modulator accelerometer and the finite-element analysis of the mechanical structure are described. The performance obtained from prototype units is also presented. Silicon micromachining techniques were used to fabricate a high-precision, micro-gee accelerometer. Operating in a closed-loop configuration, the accelerometer utilizes electrostatic field sensing and electrostatic force feedback. The sensor assembly consists of three silicon chips, bonded together at the wafer level. The micromachined sensor is operated in a vacuum to eliminate nonlinear viscous damping and to provide a high-Q second-order mechanical resonant circuit. Near-critical damping is provided by the closed-loop control system. The control system is a highly oversampled sigma-delta modulator that produces a wide dynamic range and a direct digital output. These accelerometers can be built to serve widely diverse markets at a reasonable cost. Frequency ranges from DC to thousands of hertz, accelerations from nano-gees to hundreds of gees, and dynamic ranges in excess of 120 dB can all be accommodated in small rugged silicon accelerometers. >
82 citations
01 Jul 2006
TL;DR: This paper introduces a novel robust algorithm for fixed-rate compression of high dynamic range textures at low bit rates that can be efficiently implemented in hardware, and supports textures with a dynamic range of over 109:1.
Abstract: In this paper, we break new ground by presenting algorithms for fixed-rate compression of high dynamic range textures at low bit rates. First, the S3TC low dynamic range texture compression scheme is extended in order to enable compression of HDR data. Second, we introduce a novel robust algorithm that offers superior image quality. Our algorithm can be efficiently implemented in hardware, and supports textures with a dynamic range of over 109:1. At a fixed rate of 8 bits per pixel, we obtain results virtually indistinguishable from uncompressed HDR textures at 48 bits per pixel. Our research can have a big impact on graphics hardware and real-time rendering, since HDR texturing suddenly becomes affordable.
81 citations
TL;DR: This work improves an existing, automatic, global reverse tone mapping operator based on a gamma expansion by providing a new way for automatic parameter calculation from the image statistics, and shows that this method yields better results across the whole range of exposures.
Abstract: As the dynamic range of displays keeps increasing, there is a need for reverse tone mapping methods, which aim at expanding the dynamic range of legacy low dynamic range images for viewing on higher dynamic range displays. While a number of strategies have been proposed, most of them are designed for well-exposed input images and are not optimal when dealing with ill-exposed (under- or over-exposed) content. Further, this type of content is more prone to artifacts which may arise when using local methods. In this work, we build on an existing, automatic, global reverse tone mapping operator based on a gamma expansion. We improve this method by providing a new way for automatic parameter calculation from the image statistics. We show that this method yields better results across the whole range of exposures.
81 citations
TL;DR: An integrated wide-dynamic-range interface circuit for resistive gas-sensors arrays that achieves a measurement accuracy almost always better than 0.1 % over a sensor resistance range of more than 5 decades is presented.
Abstract: In this paper an integrated wide-dynamic-range interface circuit for resistive gas-sensors arrays is presented. The proposed device consists of a multiscale transresistance continuous time amplifier followed by a 13-bit incremental A/D converter. The circuit selects automatically the scale to use for each measurement and includes two digital-to-analog converters for the calibration of offset and gain of each scale. The proposed interface circuit achieves a measurement accuracy almost always better than 0.1 % over a sensor resistance range of more than 5 decades [100 Omega-20 MOmega], leading to an equivalent dynamic range of about 160 dB. The chip has been realized with a 0.35 mum CMOS technology and occupies an area of 3.1 mm2 consuming 6 mW from a 3.3 V power supply.
81 citations