scholarly journals A Fast and Reliable Luma Control Scheme for High-Quality HDR/WCG Video

2018 ◽  
Vol 8 (10) ◽  
pp. 1975 ◽  
Author(s):  
Tae-Young Kim ◽  
Yong-Goo Kim
Keyword(s):  
Dynamic Range ◽  
Sampling Rate ◽  
Optimal Solution ◽  
High Dynamic Range ◽  
Consumer Electronics ◽  
Processing Unit ◽  
Fixed Amount ◽  
Control Scheme ◽  
Wide Color Gamut ◽  
Rate Conversion

The evolution of display technologies makes high dynamic range/wide color gamut (HDR/WCG) media of great interest in various applications including cinema, TV, blue-ray titles, and others. However, the HDR/WCG media format for consumer electronics requires the sampling rate conversion of chroma signals, resulting in a quality problem on the luminance perception of media, even without compression. In order to reduce such luminance perception problems, this paper proposes a fast and reliable luma control scheme which takes advantage of the bounds on the best luma value derived from the solution based on truncated Taylor series. Simulations performed for an extensive comparison study demonstrate that the proposed algorithm significantly outperforms the previous representative fast luma control schemes, resulting in almost the same quality of the iterative optimal solution with a fixed amount of computations per processing unit.

scholarly journals 2D Legendre Moments-Based Visual Control

2012 ◽  
Vol 162 ◽  
pp. 487-496 ◽  
Author(s):  
Aurelien Yeremou Tamtsia ◽  
Youcef Mezouar ◽  
Philippe Martinet ◽  
Haman Djalo ◽  
Emmanuel Tonye
Keyword(s):  
Visual Servoing ◽  
Dynamic Range ◽  
High Sensitivity ◽  
High Dynamic Range ◽  
Interaction Matrix ◽  
Geometric Moments ◽  
Control Scheme ◽  
Control Schemes ◽  
Legendre Moments ◽  
Set Of Points

Among region-based descriptors, geometric moments have been widely exploited to design visual servoing schemes. However, they present several disadvantages such as high sensitivity to noise measurement, high dynamic range and information redundancy (since they are not computed onto orthogonal basis). In this paper, we propose to use a class of orthogonal moments (namely Legendre moments) instead of geometric moments to improve the behavior of moment-based control schemes. The descriptive form of the interaction matrix related to the Legendre moments computed from a set of points is rst derived. Six visual features are then selected to design a partially-decoupled control scheme. Finally simulated and experimental results are presented to illustrate the validity of our proposal.

scholarly journals The technology behind the exceptional visual experience via high dynamic range

2018 ◽  
Vol 7 ◽  
Author(s):  
Neeraj J. Gadgil ◽  
Qing Song ◽  
Guan-Ming Su ◽  
Samir N. Hulyalkar
Keyword(s):  
Dynamic Range ◽  
Transfer Functions ◽  
High Dynamic Range ◽  
Exciting Field ◽  
Optical Signals ◽  
Industry Applications ◽  
Wide Color Gamut ◽  
Technical Advances ◽  
Display Technology ◽  
High Dynamic

High dynamic range (HDR) technology is rapidly changing today's video landscape by offering spectacular visual experiences. The development in display technology to support higher luminance levels for commercial and consumer electronic devices such as TVs, smartphones, projectors etc., has created an exponential demand for delivering HDR content to viewers. The essential component of the HDR technology is “expanded contrast,” which allows richer black levels and enhanced brightness, providing dramatic contrast that reveals finer details. The use of “wide color gamut” allows wider color spectrum and richer colors providing aesthetically pleasing true-to-life feel. Such visual enhancements clearly establish HDR as one of the most significant upcoming video technologies.In this paper, we review major technical advances in this exciting field of study. Quantization of HDR signals is reviewed in the context of transfer functions that convert optical signals to electrical signals and vice versa. They mainly consist of Perceptual Quantization and Hybrid-Log-Gamma approaches. Compression of HDR content is another broad area of study involving several coding approaches, often categorized in terms of backward-compatibility and single/dual layer methods. Some key industry applications of HDR processing systems are also discussed, followed by some future directions of HDR technology.

A Biologically Inspired Smart Camera for Use in Surveillance Applications

2012 ◽  
pp. 188-201
Author(s):  
Kosta Haltis ◽  
Matthew J. Sorell ◽  
Russell Brinkworth
Keyword(s):  
Moving Objects ◽  
Dynamic Range ◽  
Graphics Processing Unit ◽  
High Dynamic Range ◽  
Video Camera ◽  
General Purpose ◽  
Processing Unit ◽  
Biologically Inspired ◽  
Biological Vision ◽  
Surveillance Applications

Biological vision systems are capable of discerning detail as well as detecting objects and motion in a wide range of highly variable lighting conditions that proves challenging to traditional cameras. In this paper, the authors describe the real-time implementation of a biological vision model using a high dynamic range video camera and a General Purpose Graphics Processing Unit. The effectiveness of this implementation is demonstrated in two surveillance applications: dynamic equalization of contrast for improved recognition of scene detail and the use of biologically-inspired motion processing for the detection of small or distant moving objects in a complex scene. A system based on this prototype could improve surveillance capability in any number of difficult situations.

The Anza array: A high-dynamic-range, broadband, digitally radiotelemetered seismic array

1984 ◽  
Vol 74 (4) ◽  
pp. 1469-1481
Author(s):  
Jon Berger ◽  
L. M. Baker ◽  
J. N. Brune ◽  
J. B. Fletcher ◽  
T. C. Hanks ◽  
...  
Keyword(s):  
Large Scale ◽  
Scaling Laws ◽  
Dynamic Range ◽  
Body Wave ◽  
Sampling Rate ◽  
Digital Transmission ◽  
High Dynamic Range ◽  
Seismic Array ◽  
High Rate ◽  
Small Aperture

Abstract A small aperture seismic array has been deployed along a 30-km stretch of the San Jacinto fault in the vicinity of the town of Anza, California. The array was installed to study specifically the scaling laws of body-wave spectra, the character of high-frequency ground motion, the physical interpretation of seismic stress drops, and the interaction of earthquakes. This region was chosen for these studies due to its high rate of seismic activity in the 2 ≦ M ≦ 4.5 range, the likelihood of a M > 6 event in the next decade, and the existence of the Southern California Batholith on either side of the fault, reducing problems associated with attenuation and large scale anisotropy. These studies employ an instrument package with a frequency response of 100 Hz, a dynamic range of 138 dB, a sampling rate of 250 times per second per component, and a 16-bit A/D converter. The array consists of 10 three-component stations, telemetered via digital VHF radio to a nearby mountain peak and thence via a microwave link to La Jolla, California. A minicomputer system monitors the array's performance, detects events, and records data upon demand. Initial results demonstrate the feasibility of digital transmission with an inherent increase in data quality over analog systems.

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