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•
01 Oct 2015TL;DR: In this paper, a display device, including a content receiving unit configured to receive a high dynamic range image and an image processing unit, is configured to detect a first region whose luminance value is equal to or greater than a reference value within the high-level image and perform tone mapping on an image of the first region.
Abstract: A display device, including a content receiving unit configured to receive a high dynamic range image, an image processing unit configured to detect a first region whose luminance value is equal to or greater than a reference luminance value within the high dynamic range image and perform tone mapping on an image of the first region based on feature information of the image of the first region, and a display unit configured to display a low dynamic range image on which the tone mapping is performed.
44 citations
Patent•
24 Sep 1993TL;DR: In this article, a multi-resonant electronic power converter with a wide output voltage dynamic range is presented, where the output voltage may be adjusted by altering the frequency of the AC signal also known as the switching frequency.
Abstract: Methods and apparatus for variably converting a DC voltage to a different DC voltage level are effected by a multi-resonant electronic power converter with a wide output voltage dynamic range. The power conversion is accomplished by converting the DC voltage to an AC signal, adjusting or attenuating the AC signal to the desired amplitude, and then converting the AC signal back to a DC voltage. The output voltage may be adjusted by altering the frequency of the AC signal also known as the switching frequency. A wide dynamic range is achieved at a narrow switching frequency bandwidth by inserting either a fourth or higher order low pass filter or a notch filter at the output of the switching transistor. The high roll-off rate exhibited by either filter provides a relatively high dynamic range in a narrow frequency range.
44 citations
Patent•
18 Feb 1994
TL;DR: In this article, an analog-to-digital (A/D) converter is used for digitizing input signals having a high dynamic range, where the signal is scaled by each respective channel in the attenuator bank and the digitized sample is then corrected according to the attenuation or gain factor of the scaled channel.
Abstract: A digitizer suitable for digitizing input signals having a high dynamic range. The digitizer is microprocessor controlled and comprises an input stage, a multi-channel attenuator or amplifier bank, a multiplexer and a analog-to-digital (A/D) converter. The function of the multi-channel bank is to move the input signal within the range of the A/D converter. The input signal to be digitized is fed through the input stage to each of the channels in the attenuator bank. The signal is scaled by each respective channel in the attenuator bank. The multiplexer is used to switch the scaled signal which is within the range of the A/D converter for digitizing. The digitized sample is then corrected according to the attenuation or gain factor of the scaled channel. The digitizer includes a comparator bank which is used to determine the channel with the widest signal range within the range of the A/D converter. The digitizer also includes a channel calibrator for calibrating the actual gain or attenuation of each channel. In another aspect, the digitizer can be implemented using an optical front-end comprising an optical beam splitter, optical attenuators and amplifier banks. The optical front-end provides improved noise immunity and faster speed of operation.
44 citations
Patent•
19 Apr 1988
TL;DR: In this paper, a high dynamic range charge collection circuit is described, which includes additional electrodes between the photogate and the transfer gate electrode to create charge transfer wells of different depths.
Abstract: A high dynamic range charge collection circuit is described which includes additional electrodes between the photogate and the transfer gate electrode to create charge transfer wells of different depths. The charge-coupled device has a nonlinear relationship between the charge transferred out of the sensing region and the charge generated in the photosite.
44 citations
TL;DR: The trend in data acquisition systems for modern physics experiments is to digitize analog signals closer and closer to the detector, and two new boards, designed to improve these performances by an order of magnitude are described.
Abstract: The trend in data acquisition systems for modern physics experiments is to digitize analog signals closer and closer to the detector. The digitization systems have followed the progress of commercial analog to digital converters. The state of the art for these devices is currently 225 MSample/s for a 10 to 12 bit range. The new boards, described in this paper, have been designed to improve these performances by an order of magnitude. In its simplest version, this board mainly includes 4 channels sampling analog data up to 2 GSample/s with an analog bandwidth of 300 MHz, and digitizing it with a 12-bit dynamic range. It is based on the custom-designed MATACQ chip. The latter's innovative design permits reaching these performances with power consumption smaller than 1 W. The boards are triggerable either by internal or external signals and several boards are easily synchronizable. The board integrates both GPIB and VME interfaces that permit a maximum readout speed of 500 events/s with the whole memory depth of the 4 channels read
43 citations