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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, a measurement system for the detection of time-dependent effects in broadband spectra of high-power millimeter-wave sources is demonstrated, where the upper and lower mixer sidebands of two parallel heterodyne receiver channels simultaneously, resulting in a comparatively high instantaneous measurement bandwidth of 7 GHz per channel pair and a high dynamic range of 50-60 dB in the frequency range 110-170 GHz.
Abstract: In this paper, a measurement system for the detection of time-dependent effects in broadband spectra of high-power millimeter-wave sources is demonstrated. The heterodyne approach with sub-harmonic mixers enables high dynamic range and configuration flexibility, but typically also imposes severe problems on the analysis of transient or instationary phenomena through frequency ambiguity. A key feature of the presented system is an unambiguous reconstruction of the RF spectrum from the detected IF spectra. This is done by evaluating the upper and lower mixer sidebands of two parallel heterodyne receiver channels simultaneously, resulting in a comparatively high instantaneous measurement bandwidth of 7 GHz per channel pair and a high dynamic range of 50-60 dB in the frequency range 110-170 GHz. Sample measurements obtained during the occurrence of an arc at the dielectric output window of a 140-GHz megawatt-class gyrotron demonstrate the unique capabilities of the system for detecting highly transient and broadband effects in the tube's output spectrum.

17 citations

Proceedings ArticleDOI
15 Nov 2004
TL;DR: In this article, a fifth order, single-loop, multibit delta-sigma stereo audio ADC achieves 120 dB dynamic range and 110 dB THD+N while dissipating less than 300 mW of power.
Abstract: A fifth order, single-loop, multibit delta-sigma stereo audio ADC achieves 120 dB dynamic range and 110 dB THD+N while dissipating less than 300 mW of power. A feed forward path substantially reduces the signal component in the loop, enabling high dynamic range at low power levels. A second order mismatch shaper removes any nonlinearity or tones caused by element mismatch in the feedback DAC. A rough/fine input sampling scheme alleviates the loading on the input driver, improving distortion. An offset compensated switched-capacitor scheme is used in the rough buffer to avoid offset integration in AC coupled applications. Demodulation of quantization noise and delta-sigma tones is avoided by a segmented chopping technique.

17 citations

Journal ArticleDOI
TL;DR: A new instrument for measuring the full radiance distribution in the ocean interior is introduced, based on CMOS technology to achieve intra-scene dynamic range of 6 decades and system dynamicrange of more than 9 decades.
Abstract: A new instrument for measuring the full radiance distribution in the ocean interior is introduced. The system is based on CMOS technology to achieve intra-scene dynamic range of 6 decades and system dynamic range of more than 9 decades. The spatial resolution is nominally 0.5 degrees with a temporal frame rate between 1 and 15 frames per second. The general instrumentation, detailed calibration, and a characterization of the system are described. Validity of the camera systems is demonstrated by comparison of the radiance measurements with other classical oceanographic radiometers.

17 citations

Book ChapterDOI
TL;DR: A system that allows for changing the major camera parameters after the acquisition of an image and to set the main parameters of a virtual camera system and to compute the resulting image is presented.
Abstract: We present a system that allows for changing the major camera parameters after the acquisition of an image. Using the high dynamic range composition technique and additional range information captured with a small and low-cost time-of-flight camera, our setup enables us to set the main parameters of a virtual camera system and to compute the resulting image. Hence, the aperture size and shape, exposure time, as well as the focus can be changed in a postprocessing step. Since the depth-of-field computation is sensitive to proper range data, it is essential to process the color and depth data in an integrated manner. We use a non-local filtering approach to denoise and upsample the range data. The same technique is used to infer missing information regarding depth and color which occur due to the parallax between both cameras as well as due to the lens camera model that we use to simulate the depth of field in a physically correct way.

17 citations

Proceedings Article
01 Jan 2006
TL;DR: In this article, a general solution to the problem of decoding high dynamic range (HDR) information stored as a supplement to low dynamic range images or video is proposed, where each LDR frame is paired with a lower resolution HDR version, and these are compressed separately using any of the existing methods appropriate to the task.
Abstract: We propose a general solution to the problem of decoding high dynamic range (HDR) information stored as a supplement to low dynamic range (LDR) images or video. Each LDR frame is paired with a lower resolution HDR version, and these are compressed separately using any of the existing methods appropriate to the task. On decode, the low-resolution HDR image is upsampled to match the resolution of the LDR version, and the high frequencies are transferred from the LDR to the HDR frame. The recovery process places no constraints on the color space or tone-mapping of the backwards-compatible LDR content, and is thus ideally suited to applications such as DVD movies that target legacy equipment while building in forward-compatibility with emerging HDR systems. A fast and simple recovery algorithm is demonstrated, followed by a more sophisticated and accurate technique. Examples are shown on computer-generated video frames as well as HDR captured video.

17 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023122
2022263
2021164
2020243
2019238
2018262