Topic
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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Patent•
20 Sep 2013
TL;DR: Readout integrated circuits placed underneath the suspended sensing elements detect changes of electrical resistance of sensing elements and digitize the signals with digital-to-analog convertor for each element.
Abstract: Readout integrated circuits placed underneath the suspended sensing elements detect changes of electrical resistance of sensing elements and digitize the signals with digital to analog convertor for each element. Readout electronics provides low parasitics, high signal to noise ratio, high data rate, high dynamic range and instantaneous global readout.
16 citations
TL;DR: Goodrich et al. as mentioned in this paper developed a focal plane (FPA) array for short wave infrared (SWIR) imaging technology for soldier-based and unmanned platforms, which is optimized for day/night imaging in the wavelength region from 0.4 μm to 1.7 μm.
Abstract: The increasing demand for short wave infrared (SWIR) imaging technology for soldier-based and unmanned
platforms requires camera systems where size, weight and power consumption are minimized without loss of
performance. Goodrich, Sensors Unlimited Inc. reports on the development of a novel focal plane (FPA) array for
DARPA's MISI (Micro-Sensors for Imaging) Program. This large format (1280 x 1024) array is optimized for
day/night imaging in the wavelength region from 0.4 μm to 1.7 μm and consists of an InGaAs detector bump bonded to a
capacitance transimpedance amplifier (CTIA)-based readout integrated circuit (ROIC) on a compact 15 μm pixel pitch.
Two selectable integration capacitors provide for high dynamic range with low (< 50 electrons) noise, and expanded onchip
ROIC functionality includes analog-to-digital conversion and temperature sensing. The combination of high
quality, low dark current InGaAs with temperature-parameterized non-uniformity correction allows operation at ambient
temperatures while eliminating the need for thermoelectric cooling. The resulting lightweight, low power
implementation is suitable for man-portable and UAV-mounted applications.
16 citations
Patent•
11 Sep 2007TL;DR: In this article, a high dynamic range image sensor and a method and medium for measuring charges in a pixel are provided, which includes a sensor that resets a predetermined pixel when the pixel has reached a saturation level.
Abstract: A high dynamic range image sensor and a method and medium for measuring charges in a pixel are provided The high dynamic range image sensor includes a sensor that resets a predetermined pixel when the pixel has reached a saturation level, a storage unit that stores the number of times the pixel has been reset, and a measurement unit that measures the quantity of light received in the pixel using the number of times the pixel has been reset, which is simply referred to as the number of resets, and the quantity of charges remaining after the pixel is finally reset
15 citations
Patent•
06 Nov 2006TL;DR: In this article, a phase-sensitive frequency-domain representation of the input analog waveform is read out and digitized to produce a spectral series of digital values, which are then determined based on the spectral series.
Abstract: A method and apparatus for converting an analog waveform to a series of digital values includes receiving an input analog waveform to be digitized over a particular frequency band. A phase-sensitive frequency-domain representation of the input analog waveform is recorded. The phase-sensitive frequency-domain representation is read out and digitized to produce a spectral series of digital values. An output series of digital values that represent the analog waveform digitized over the particular frequency band is determined based on the spectral series. In some embodiments, the spectral series of digital values is produced with a conventional high dynamic range, low bandwidth digitizer that has a bandwidth at least a factor of two less than a width of the particular frequency band for digitizing the target analog waveform.
15 citations
TL;DR: Experimental results show that for the first minimization, the optimal rate-distortion performances are achieved, and that the second optimization yields the best tradeoff between rate- Distortion performance and quality preservation of the SDR signal.
Abstract: This paper addresses the problem of designing a global tone mapping operator for rate distortion optimized backward compatible compression of high dynamic range (HDR) images. We address the problem of tone mapping design for two different use cases leading to two different minimization problems. The first problem considered is the minimization of the distortion on the reconstructed HDR signal under a rate constraint on the standard dynamic range (SDR) layer. The second problem remains the same minimization with an additional constraint to preserve a good quality for the SDR signal. Both the distortion and rate are expressed as a function of the spatial gradient in HDR images. Experiments show that the proposed rate and distortion models based on the HDR image gradient accurately predict the real image rate and distortion measures. Experimental results show that for the first minimization, the optimal rate-distortion performances are achieved, and that the second optimization yields the best tradeoff between rate-distortion performance and quality preservation of the SDR signal.
15 citations