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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TL;DR: In this article, a massively multiplexed single-photon detector is presented, which exhibits a dynamic range of 123 dB, from optical energies as low as 10 − 7 − 2.5
Abstract: Detecting light is fundamental to all optical experiments and applications. At the single photon level, the quantised nature of light requires specialised detectors, which typically saturate for more than one photon, rendering the measurement of bright light impossible. Saturation can be partially overcome by multiplexing single-photon-sensitive detectors, enabling measurement up to tens of photons. However, current approaches are still far from bridging the gap to bright light levels. Here, we report on a massively-multiplexed single-photon detector, which exhibits a dynamic range of 123 dB, from optical energies as low as $\mathbf{10^{-7}}$ photons per pulse to $\mathbf{\sim2.5\times10^{5}}$ photons per pulse. This allows us to calibrate a single photon detector directly to a power meter. The use of a single-photon sensitive detector further allows us to characterise the nonclassical features of a variety of quantum states. This device will find application where high dynamic range and single-photon sensitivity are required.
19 citations
TL;DR: A novel LED-based optomechanical configuration is proposed to implement the desirable luminous pattern in the high dynamic range (HDR) liquid crystal displays (LCDs) and the design flexibility made the methodology applicable to any panel dimension and backlight division of the HDR LCDs, and to the conventional full-on backlighting LCDs as well.
Abstract: A methodology, based on two-dimensional super-Gaussian light spread functions (LSFs), was studied for the light-emitting-diode (LED) backlighting system in the high dynamic range (HDR) liquid crystal displays (LCDs). We proposed a novel LED-based optomechanical configuration to implement the desirable luminous pattern. A dual-liquid-crystal-panel system was constructed as a pseudo-HDR LCD to evaluate the super-Gaussian illumination. The proposed HDR scheme was verified via the current platform: overall luminance uniformity, contrast ratio and processing speed could be improved by factors of 1.55, 1.95-4.15, and 4.82, respectively. The design flexibility made the methodology applicable to any panel dimension and backlight division of the HDR LCDs, and to the conventional full-on backlighting LCDs as well.
19 citations
Patent•
21 Jan 2009
TL;DR: In this article, an image sensor having a photo-sensitive pixel array and supporting the non-interlaced line reading is described, where every line has the same nominal gain and exposure time; in the down-sampling mode, the exposure time of line is varied according to the alternation sequence of at least two different exposure time.
Abstract: The invention discloses an image sensor having a photosensitive pixel array and supporting the non-interlaced line reading. In conventional resolution mode, every line has the same nominal gain and exposure time; in the down-sampling mode, the exposure time of line is varied according to the alternation sequence of at least two different exposure time; in the up-sampling mode, the original pixel data from the lines with different exposure time is combined to achieve a high dynamic range at the same time with the down-sampling.
19 citations
TL;DR: A single exposure dynamic rage (SEHDR) signal is obtained by introducing a triple-gain pixel and a low noise dual-gain readout circuit, which inherently mitigates the artifacts from moving objects or time-varying light sources that can appear in the multiple exposure high dynamic range (MEHDR).
Abstract: To respond to the high demand for high dynamic range imaging suitable for moving objects with few artifacts, we have developed a single-exposure dynamic range image sensor by introducing a triple-gain pixel and a low noise dual-gain readout circuit. The developed 3 μm pixel is capable of having three conversion gains. Introducing a new split-pinned photodiode structure, linear full well reaches 40 ke-. Readout noise under the highest pixel gain condition is 1 e- with a low noise readout circuit. Merging two signals, one with high pixel gain and high analog gain, and the other with low pixel gain and low analog gain, a single exposure dynamic rage (SEHDR) signal is obtained. Using this technology, a 1/2.7", 2M-pixel CMOS image sensor has been developed and characterized. The image sensor also employs an on-chip linearization function, yielding a 16-bit linear signal at 60 fps, and an intra-scene dynamic range of higher than 90 dB was successfully demonstrated. This SEHDR approach inherently mitigates the artifacts from moving objects or time-varying light sources that can appear in the multiple exposure high dynamic range (MEHDR) approach.
19 citations
TL;DR: Two types of integrating X-ray detectors, imaging plates and charge-coupled devices, represent the forefront of design in position-sensitive Xray detectors as discussed by the authors, and their high dynamic range, spatial resolution, large active area, low noise, and ability to count at high rates make them excellent detectors for Xray crystallography, fiber diffraction and low-angle scattering data collection.
19 citations