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•
27 Sep 1995TL;DR: In this article, the authors proposed an optical communication link with an overall linear transfer characteristic and high dynamic range suitable for transmitting analog signals, which includes an optical intensity modulator such as a Mach-Zehnder modulator, biased to a low bias point to reduce noise, and a detector that performs optical heterodyning to recover a transmitted modulating signal.
Abstract: An optical communication link having an overall linear transfer characteristic and high dynamic range suitable for transmitting analog signals. The link includes an optical intensity modulator, such as a Mach-Zehnder modulator, biased to a low-bias point to reduce noise, and a detector that performs optical heterodyning to recover a transmitted modulating signal. Heterodyning produces a beat frequency signal and sidebands that contain the same information as the modulating signal, but without second-harmonic distortion components. Use of the low-bias point is known to reduce noise and increase dynamic range, but only at the expense of second-harmonic distortion because the modulator output is a function of the square of the modulating signal. Although second harmonics can be filtered out, the bandwidth of the modulating signal is then limited to less than an octave. In the communication link of the invention, heterodyning produces sidebands that vary with the square root of the modulator transmission characteristic. Therefore, the overall transfer characteristic is substantially linear, second harmonic distortion is eliminated, and the modulating signal can extend over a multi-octave bandwidth.
19 citations
Proceedings Article•
01 Sep 2013
TL;DR: It is shown that higher compression ratios can be obtained by preserving the temporal coherency of a sequence by assessing the quality of a reconstructed HDR sequence when a TMO and a codec are applied.
Abstract: Tone Mapping Operators (TMOs) aim at converting real world high dynamic range (HDR) images captured with HDR cameras, into low dynamic range (LDR) images that can be displayed on LDR displays Even though most of the designed solutions provide good results for still HDR images, they are not efficient for tone mapping video sequences The main issue is their inability to preserve the temporal correlation inherent in a video sequence This has a consequence on the video compression efficiency In this work, we show that higher compression ratios can be obtained by preserving the temporal coherency of a sequence We evaluate temporal coherency and video compression in regard to two aspects The first one evaluates the quality of the decoded LDR sequences after applying different TMOs The second aspect assesses the quality of a reconstructed HDR sequence when a TMO and a codec are applied
19 citations
TL;DR: This work proposes to combine multiple exposures into a composite that uses only pixels from those exposures in which they are neither under- nor overexposed, and creates an enhanced dynamic range x-ray image created in analogy to visible-light high dynamic range photography.
19 citations
TL;DR: In this article, a very low power, high resolution, medium speed D/A converter is described, which achieved 15-bit monotonicity and less than 0.07 percent overall linearity at a clock frequency of 100 kHz, without requiring any trimming or calibration.
Abstract: A very low-power, high-resolution, medium-speed D/A converter is described. The converter was realized using a standard analog CMOS technology. It achieved 15-bit monotonicity and less than 0.07-percent overall linearity at a clock frequency of 100 kHz, without requiring any trimming or calibration. The measured SNR was 85 dB, the power dissipation was less than 10 mW, and the distortion for a sinusoidal output was less than 0.04 percent. The D/A converter is intended for battery-powered speech and music synthesis applications where high dynamic range, low power, and low cost are all important. >
19 citations
Patent•
07 Aug 2017
TL;DR: In this paper, an autonomous vehicle with a video camera merges images taken at different light levels by replacing saturated parts of an image with corresponding parts of a lower-light image to stream a video with a dynamic range that extends to include very low-light and very intensely lit parts.
Abstract: The invention provides an autonomous vehicle with a video camera that merges images taken a different light levels by replacing saturated parts of an image with corresponding parts of a lower-light image to stream a video with a dynamic range that extends to include very low-light and very intensely lit parts of a scene. The high dynamic range (HDR) camera streams the HDR video to a HDR system in real time—as the vehicle operates. As pixel values are provided by the camera's image sensors, those values are streamed directly through a pipeline processing operation and on to the HDR system without any requirement to wait and collect entire images, or frames, before using the video information.
19 citations