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.

Dynamic range adjustment for high dynamic range and wide color gamut video coding

Abstract: This disclosure relates to processing video data, including processing video data to conform to a high dynamic range/wide color gamut (HDR/WCG) color container. As will be explained in more detail below, the techniques of the disclosure including dynamic range adjustment (DRA) parameters and apply the DRA parameters to video data in order to make better use of an HDR/WCG color container. The techniques of this disclosure may also include signaling syntax elements that allow a video decoder or video post processing device to reverse the DRA techniques of this disclosure to reconstruct the original or native color container of the video data.

Integrated Synthetic Fourth-Order $Q$ -Enhanced Bandpass Filter With High Dynamic Range, Tunable Frequency, and Fractional Bandwidth Control

Abstract: This paper demonstrates a tunable synthetic fourth-order bandpass filter (BPF) at microwave frequencies. Two parallel second-order Q-enhanced LC BPFs responses are added with the out of phase to synthesize a fourth-order BPF response. The filter is implemented in a 130-nm SiGe BiCMOS technology with a core die area of $0.53 \times 0.7$ mm2. The filter center frequency can be tuned from 4 to 8 GHz (C-band). The filter also achieves a wide 3-dB fractional bandwidth (BW) tuning range of 2%–25%, with a passband ripple of less than 0.5 dB. The corresponding normalized dynamic range (DR) is 151–166 $\text {dB}\cdot \text {Hz}$ owing to a switched varactor control scheme to realize a large effective tuning range with high linearity. Using the parallel synthesis approach, the filter can maintain the DR of a second-order BPF while achieving a fourth-order frequency selectivity, which is favorable compared to cascading resonators. On the lower side of the band, the filter achieves more than 65 dB of ultimate rejection. On the upper side, the rejection is more than 52 dB. The filter also employs a variable transconductor for noise-linearity tradeoff flexibility. The power consumption of the filter is 112–125 mW over the above fractional BW tuning range at the target C-band.

Method and apparatus for a high performance and high dynamic range baseband power control system

Abstract: A method and system controls transmit power by combining the advantages of digital attenuation and analog baseband step attenuators by calibration to overcome the limitations of analog step attenuators. The calibration technique uses highly accurate digital attenuators to determine the actual sizes of the analog steps as analog step attenuator is stepped through a range of attenuation levels. A method of calibration accurately measures attenuation steps comparison to a digital attenuator so that the attenuation actually realized by the analog step attenuator is accurately known. Therefore, the difference between the attenuation realized by the analog step attenuator and the desired attenuation is accurately known. The difference is realized in the digital attenuator and the attenuation resulting from the composite of the digital and analog step attenuator can very accurately realize the requested attenuation.

Single photon range, intensity and photon flux imaging with kilohertz frame rate and high dynamic range

Abstract: Optical sensing with single photon counting avalanche diode detectors has become a versatile approach for ranging and low light level imaging. In this paper, we compare time correlated and uncorrelated imaging of single photon events using an InGaAs single-photon-counting-avalanche-photo-diode (SPAD) sensor with a 32 × 32 focal plane array detector. We compare ranging, imaging and photon flux measurement capabilities at shortwave infrared wavelengths and determine the minimum number of photon event measurements to perform reliable scene reconstruction. With time-correlated-single-photon-counting (TCSPC), we obtained range images with centimeter resolution and determined the relative intensity. Using uncorrelated single photon counting (USPC), we demonstrated photon flux estimation with a high dynamic range from ϕ^=2×104 to 1.3 × 107 counts per second. Finally, we demonstrate imaging, ranging and photon flux measurements of a moving target from a few samples with a frame rate of 50 kHz.

66.1: Distinguished Student Paper: Deriving LED Driving Signal for Area-Adaptive LED Backlight in High Dynamic Range LCD Displays

Abstract: LED backlight technique dramatically enhances the dynamic range of an LCD display and hence extends its ability to present images with high reality. This is achieved by modulating LEDs individually, thus providing an area-adaptive backlight for the display. However, crosstalk of LEDs is not only a blessing for supplying high brightness but is also a curse for causing potential artifacts, making the derivation of LED driving signal a challenging task. This paper formulates the problem in two mathematical models: an iterative de-convolution approach and a linear optimization approach. Algorithms for solving these two models are provided. An image database composed of 161 high dynamic range images is built to evaluate the performances of these two approaches.