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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09 Jun 2010
TL;DR: In this paper, a high dynamic image acquisition process based on micro-imaging detection and its device, comprising a microscope and a computer system, is described, where a digital CCD image sensor is equippedon the microscope.
Abstract: The invention relates to a high dynamic image acquisition process based on micro-imaging detection and its device, comprising a microscope and a computer system. A digital CCD image sensor is equippedon the microscope. A circular disc type optical gradient attenuator and a controller are arranged at the lower part of the object lens. Under the condition of invariant exposure time for CCD, the computer controls the rotary location for the circular disc type optical gradient attenuator sheet to take the multi-frame microscopic image with different light exposure in the same visual field and further obtain the high dynamic range image information in the scene. The invention utilizes the computer image processing technique to perform a preprocessing and blocking treatment to the sequence frame of the microscopic image with different light exposure, selects the corresponding block of different frames of the sequence microscopic image in the same position to take part in the synthesis of the high dynamic microscopic image, and finally performs the smooth and amalgamation process to the synthesis image to realize the output of the high dynamic microscopic image. The invention effectivelyrepresents the scene information in light region and dark region and improves the detecting precision of the micro-imaging detecting system.
16 citations
20 Jun 2005
TL;DR: This work discusses distribution of intensities across the range of the display contrast and a mapping of the transfer function to a perceptually linear space over the rangeOf intensities that the display can produce and proposes generating automatic transfer functions for order independent operators through histogram-equalization of data in perceptuallylinear space.
Abstract: Dynamic range restrictions of conventional displays limit the amount of detail that can be represented in volume rendering applications. However, high dynamic range displays with contrast ratios larger than 50,000 : 1 have recently been developed. We explore how these increased capabilities can be exploited for common volume rendering algorithms such as direct volume rendering and maximum projection rendering. In particular, we discuss distribution of intensities across the range of the display contrast and a mapping of the transfer function to a perceptually linear space over the range of intensities that the display can produce. This allows us to reserve several just noticeable difference steps of intensities for spatial context apart from clearly depicting the main regions of interest. We also propose generating automatic transfer functions for order independent operators through histogram-equalization of data in perceptually linear space.
16 citations
TL;DR: A 48-200 MHz CMOS hybrid tracking low-pass filter with low power and high dynamic range is presented to solve a local oscillator harmonic-mixing problem for Advanced Television Systems Committee terrestrial digital TV tuner integrated circuits.
Abstract: In this paper, a 48-200 MHz CMOS hybrid tracking low-pass filter with low power and high dynamic range is presented to solve a local oscillator harmonic-mixing problem for Advanced Television Systems Committee terrestrial digital TV tuner integrated circuits. For low power consumption, the first-order passive RC filter and the second-order transconductor-C filter are combined to implement the third-order Chebyshev tracking low-pass filter. A transconductor linearization technique based on a method of multiple gated transistors is adopted to achieve high dynamic range. Fabricated in a 0.18 μm CMOS process, it achieves a maximum in-band input-referred noise density of 5.1 nV/√Hz and maximum in-band output-referred third-order intercept point of 17.3 dBm, while dissipating 23.4 mW with 1.8 V. The total chip area is 0.6 mm × 0.4 mm.
16 citations
20 May 2012
TL;DR: The HDR-ARtiSt hardware platform is a FPGA-based architecture that can produce a real-time high dynamic range video from successive image acquisition and consists of a hardware architecture with different algorithms: double exposure control during image capture, building of an HDR image by combining the multiple frames, and final tone mapping for viewing on a LCD display.
Abstract: This paper describes the HDR-ARtiSt hardware platform, a FPGA-based architecture that can produce a real-time high dynamic range video from successive image acquisition The hardware platform is built around a standard low dynamic range (LDR) CMOS sensor and a Virtex 5 FPGA board The CMOS sensor is a EV76C560 provided by e2v This 13 Megapixel device offers novel pixel integration/readout modes and embedded image pre-processing capabilities including multiframe acquisition with various exposure times Our approach consists of a hardware architecture with different algorithms: double exposure control during image capture, building of an HDR image by combining the multiple frames, and final tone mapping for viewing on a LCD display Our video camera system is able to achieve a real-time video rate of 30 frames per second for a full sensor resolution of 1,280 × 1,024 pixels
16 citations