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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.


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Patent
12 May 2010
TL;DR: In this article, an adjusting method with high dynamic range which comprises the following steps: obtaining the brightness range of images with low dynamic range according to the brightness of the images with high-dynamic-range, wherein the brightness ranges of the image with low-dimensional range is the brightness which can be displayed by a display device; and conducting linear mapping and histogram equalization on obtained results of the brightness ranging of the Images with Low-Dynamic Range (LDR) and Images with High-DDR (HDR).
Abstract: The invention discloses an adjusting method with high dynamic range which comprises the following steps: obtaining the brightness range of images with low dynamic range according to the brightness of the images with high dynamic range, wherein the brightness range of the images with low dynamic range is the brightness range which can be displayed by a display device; and conducting linear mapping and histogram equalization on obtained results of the brightness range of the images with low dynamic range, and obtaining the images with low dynamic range. In the invention, high dynamic range adjustment technology for global mapping of single-frame images is more reasonable so as to improve the image quality, the details of bright and dark environments can be reasonably displayed simultaneously, algorithm is simple and practical, and discontinuous brightness caused by the fusion of local mapping and multi-frame images is avoided; and by providing users with the factors for controlling the image contrast and detail richness, the images are convenient for being adjusted to the effect which is more acceptable for human eyes.

28 citations

Patent
06 Dec 2007
TL;DR: In this paper, an improved imaging device having high dynamic range and to monitoring and automatic control systems incorporating the improved imaging devices is presented. But the present invention relates to improved imaging and monitoring devices.
Abstract: The present invention relates to improved imaging devices having high dynamic range and to monitoring and automatic control systems incorporating the improved imaging devices.

28 citations

Journal ArticleDOI
TL;DR: The study reveals that the proposed approach for phase estimation from noisy reconstructed interference fields in digital holographic interferometry using an unscented Kalman filter outperforms at lower SNR values (i.e., especially in the range 0-20 dB).
Abstract: In this research work, we introduce a novel approach for phase estimation from noisy reconstructed interference fields in digital holographic interferometry using an unscented Kalman filter. Unlike conventionally used unwrapping algorithms and piecewise polynomial approximation approaches, this paper proposes, for the first time to the best of our knowledge, a signal tracking approach for phase estimation. The state space model derived in this approach is inspired from the Taylor series expansion of the phase function as the process model, and polar to Cartesian conversion as the measurement model. We have characterized our approach by simulations and validated the performance on experimental data (holograms) recorded under various practical conditions. Our study reveals that the proposed approach, when compared with various phase estimation methods available in the literature, outperforms at lower SNR values (i.e., especially in the range 0-20 dB). It is demonstrated with experimental data as well that the proposed approach is a better choice for estimating rapidly varying phase with high dynamic range and noise. (C) 2014 Optical Society of America

28 citations

Patent
23 Aug 2002
TL;DR: In this paper, a pixel architecture and associated three phase operating method for a CMOS active pixel sensor system is disclosed. And the architecture of the pixel of the present invention is capable of responding across a wide dynamic range of incident light while exhibiting minimal fixed pattern noise.
Abstract: A pixel architecture and associated three phase operating method for a CMOS active pixel sensor system is disclosed. The first phase is an accumulation phase, charges from the incident light as well as charges accumulated since after the prior cycle's accumulation phase are used to charge a node to control a source follower transistor. The second phase is a read-out phase, which shuts off the transfer transistor to isolate the photodiode from the source follower transistor while an the source follower transistor causes an electrical signal to be output from the pixel. The third phase is a reset phase which couples the node used to control the source follower transistor to a reset potential source. The architecture of the pixel of the present invention is capable of responding across a wide dynamic range of incident light while exhibiting minimal fixed pattern noise.

28 citations

Journal ArticleDOI
TL;DR: The measurement validation shows that this approach can effectively eliminate the periodic error for both constant and non-constant velocity motion, and the residual error reaches to the level of the background noise of the interferometer.
Abstract: Displacement measuring interferometry has high resolution and high dynamic range, which is widely used in displacement metrology and sensor calibration. Due to beam leakage in the interferometer, imperfect polarization components, and ghost reflections, the displacement measurement suffers from periodic error, whose pitch is multiple harmonics of the Doppler frequency. In dynamic measurements, periodic error is usually on the order of nanometers, which impacts the dynamic measurement accuracy. This paper presents an approach to estimate and correct periodic error in real time based on an extended Kalman filter, which has the capability to deal with both constant and non-constant velocity motions. This algorithm is implemented on an application-specific hardware architecture in an FPGA, which has advantages in throughput and resource usage compared with conventional implementations. The measurement validation shows that this approach can effectively eliminate the periodic error for both constant and non-constant velocity motion, and the residual error reaches to the level of the background noise of the interferometer.

28 citations


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