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•
19 Mar 2015TL;DR: In this article, a method of encoding a high dynamic range image (M_HDR) comprising the steps of: - converting the high-dynamic range image into a low-luminance dynamic-range image (LDR_o) by applying: a) normalization of the image of high-D range at a luma axis scale that is [0, 1] giving a high normalized DRL image with normalized colors that have normalized luminance (Yn_HRL), b) calculate a gamma function on normalized luminances giving converted luminance with
Abstract: A method of encoding a high dynamic range image (M_HDR), comprising the steps of: - converting the high dynamic range image into a low luminance dynamic range image (LDR_o) by applying: a) normalization of the image of high dynamic range at a luma axis scale that is [0, 1] giving a high normalized dynamic range image with normalized colors that have normalized luminance (Yn_HDR), b) calculate a gamma function on normalized luminance giving converted luminance with gamma (xg), c) apply a first tone mapping that gives lumas (v) that is defined as ** Formula **, with RHO having a predetermined value, and d) apply a monotonously increasing arbitrary tone mapping function that maps the lumas with output lumas (Yn_LDR) of the lower dynamic range image (LDR_o); and - emit, in an image signal (S_im), an encoding of the pixel colors of the lower luminance dynamic range image (LDR_o), and - emit, in the image signal (S_im), values encoding the function forms of previous color conversions bad as metadata, or values for their inverse functions, metadata that allow a receiver to reconstruct a reconstructed high dynamic range image (Rec_HDR) from the low luminance dynamic range image (LDR_o ), where RHO or a value that is a function of RHO is issued in the metadata.
40 citations
TL;DR: In this article, the inherent detector non-uniformity is corrected on the basis of self-calibrated scaled irradiance, where the response function of each pixel of an InSb detector is determined by radiometric selfcalibration, where no knowledge of the spectral characteristics of the IR system is required to recover a quantity which is linear with the incident irradiance of the object.
40 citations
Patent•
28 Nov 1997TL;DR: In this paper, a method and apparatus for efficient power amplification of a high dynamic range signal includes an envelope detector (220), a multi-range modulator (270), and a power amplifier (260).
Abstract: A method and apparatus for efficient power amplification of a high dynamic range signal includes an envelope detector (220), a multi-range modulator (270), and a power amplifier (260). The multi-range modulator (270) efficiently amplifies the envelope of the input signal by selecting a power source as a function of the amplitude of the input signal. Multi-range modulator (200) produces a pulsewidth modulated signal with a duty cycle and an amplitude. When the amplitude of the input signal rises above a reference, the duty cycle and the amplitude are modified so as to keep the multi-range modulator in an operating region of high efficiency.
40 citations
Patent•
09 Nov 2011
TL;DR: In this article, a high-dynamic range image circuit with a variable capacitor is presented. The capacitance of the variable capacitance is adjusted according to sensed light intensity or by internal feedback control, to adaptively adjust the conversion gain of the high-DAR image circuit as it reads a signal which relates to a pixel image sensed by an image sensor device.
Abstract: The present invention discloses a high dynamic range imager circuit and a method for reading high dynamic range image with an adaptive conversion gain The high dynamic range image circuit includes a variable capacitor The capacitance of the variable capacitor is adjusted according to sensed light intensity or by internal feedback control, to adaptively adjust the conversion gain of the high dynamic range image circuit as it reads a signal which relates to a pixel image sensed by an image sensor device In each cycle, the signal can be read twice or more with different dynamic ranges, to enhance the accuracy of the signal
40 citations
11 Jan 2021
TL;DR: In this article, the authors introduce the system-level requirements and design challenges on mm-wave power amplifiers due to high dynamic range signals and then introduce recent advances in mm-Wave PA technologies and innovations with several design examples.
Abstract: The next-generation 5G and beyond-5G wireless systems have stimulated a substantial growth in research, development, and deployment of mm-Wave electronic systems and antenna arrays at various scales. It is also envisioned that large dynamic range modulation signals with high spectral efficiency will be ubiquitously employed in future communication and sensing systems. As the interface between the antennas and transceiver electronics, power amplifiers (PAs) typically govern the output power, energy efficiency, and reliability of the entire wireless systems. However, the wide use of high dynamic range signals at mm-Wave carrier frequencies substantially complicates the design of PAs and demands an ultimate balance of energy efficiency and linearity as well as other PA performances. In this review paper, we will first introduce the system-level requirements and design challenges on mm-Waves PAs due to high dynamic range signals. We will review advanced active load modulation architectures for mm-Wave PAs and power devices. We will then introduce recent advances in mm-Wave PA technologies and innovations with several design examples. Special design considerations on mm-Wave PAs for phased array MIMOs and high mm-Wave frequencies will be outlined. We will also share our vision on future technology trends and innovation opportunities.
40 citations