A new corresponding color dataset covering a wide luminance range under high dynamic range viewing condition

2021 ◽  
Vol 2021 (29) ◽  
pp. 184-187
Author(s):  
Shi Xinye ◽  
Zhu Yuechen ◽  
Ming Ronnier Luo
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Color Appearance ◽  
Appearance Model ◽  
Viewing Condition ◽  
Color Changes ◽  
Wide Range ◽  
Illuminance Level ◽  
High Dynamic ◽  
The Relationship

An experiment was carried out to investigate the change of color appearance for 13 surface stimuli viewed under a wide range of illuminance levels (15-32000 lux) using asymmetrical matching method. Addition to the above, in the visual field, observers viewed colours in a dark (10 lux) and a bright (200000 lux) illuminance level at the same time to simulate HDR viewing condition. The results were used to understand the relationship between the color changes under HDR conditions, to generate a corresponding color dataset and to verify color appearance model, such as CIECAM16.

Product Review: High Dynamic Range Displays

2007 ◽  
Vol 16 (1) ◽  
pp. 119-122 ◽  
Author(s):  
Patrick Ledda
Keyword(s):  
Dynamic Range ◽  
Liquid Crystal Display ◽  
Contrast Ratio ◽  
Luminance Level ◽  
High Dynamic Range ◽  
Natural World ◽  
Adaptation Level ◽  
Wide Range ◽  
High Dynamic ◽  
3D Software

In the natural world, the human eye is confronted with a wide range of colors and luminances. A surface lit by moonlight might have a luminance level of around 10−3 cd/m2, while surfaces lit during a sunny day could reach values larger than 105 cd/m2. A good quality CRT (cathode ray tube) or LCD (liquid crystal display) monitor is only able to achieve a maximum luminance of around 200 to 300 cd/m2 and a contrast ratio of not more than two orders of magnitude. In this context the contrast ratio or dynamic range is defined as the ratio of the highest to the lowest luminance. We call high dynamic range (HDR) images, those images (or scenes) in which the contrast ratio is larger than what a display can reproduce. In practice, any scene that contains some sort of light source and shadows is HDR. The main problem with HDR images is that they cannot be displayed, therefore although methods to create them do exist (by taking multiple photographs at different exposure times or using computer graphics 3D software for example) it is not possible to see both bright and dark areas simultaneously. (See Figure 1.) There is data that suggests that our eyes can see detail at any given adaptation level within a contrast of 10,000:1 between the brightest and darkest regions of a scene. Therefore an ideal display should be able to reproduce this range. In this review, we present two high dynamic range displays developed by Brightside Technologies (formerly Sunnybrook Technologies) which are capable, for the first time, of linearly displaying high contrast images. These displays are of great use for both researchers in the vision/graphics/VR/medical fields as well as professionals in the VFX/gaming/architectural industry.

scholarly journals Galactic neutral hydrogen and the magnetic ISM foreground

2017 ◽  
Vol 12 (S333) ◽  
pp. 146-150
Author(s):  
S.E. Clark
Keyword(s):  
Interstellar Medium ◽  
Dynamic Range ◽  
Low Frequency ◽  
Neutral Hydrogen ◽  
Depth Resolution ◽  
High Dynamic Range ◽  
Neutral Gas ◽  
High Dynamic ◽  
New Generation ◽  
The Relationship

AbstractThe interstellar medium is suffused with magnetic fields, which inform the shape of structures in the diffuse gas. Recent high-dynamic range observations of Galactic neutral hydrogen, combined with novel data analysis techniques, have revealed a deep link between the morphology of neutral gas and the ambient magnetic field. At the same time, an observational revolution is underway in low-frequency radio polarimetry, driven in part by the need to characterize foregrounds to the cosmological 21-cm signal. A new generation of experiments, capable of high angular and Faraday depth resolution, are revealing complex filamentary structures in diffuse polarization. The relationship between filamentary structures observed in radio-polarimetric data and those observed in atomic hydrogen is not yet well understood. Multiwavelength observations will enable new insights into the magnetic interstellar medium across phases.

Creating high fidelity 360° virtual reality with high dynamic range spherical panorama images

2019 ◽  
Vol 9 (1) ◽  
pp. 73-109
Author(s):  
Zi Siang See ◽  
Lizbeth Goodman ◽  
Craig Hight ◽  
Mohd Shahrizal Sunar ◽  
Arindam Dey ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Best Practice ◽  
User Study ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
High Fidelity ◽  
Image Reproduction ◽  
Wide Range ◽  
High Dynamic ◽  
Spherical Panorama

Abstract This research explores the development of a novel method and apparatus for creating spherical panoramas enhanced with high dynamic range (HDR) for high fidelity Virtual Reality 360 degree (VR360) user experiences. A VR360 interactive panorama presentation using spherical panoramas can provide virtual interactivity and wider viewing coverage; with three degrees of freedom, users can look around in multiple directions within the VR360 experiences, gaining the sense of being in control of their own engagement. This degree of freedom is facilitated by the use of mobile displays or head-mount-devices. However, in terms of image reproduction, the exposure range can be a major difficulty in reproducing a high contrast real-world scene. Imaging variables caused by difficulties and obstacles can occur during the production process of spherical panorama facilitated with HDR. This may result in inaccurate image reproduction for location-based subjects, which will in turn result in a poor VR360 user experience. In this article we describe a HDR spherical panorama reproduction approach (workflow and best practice) which can shorten the production processes, and reduce imaging variables, and technical obstacles and issues to a minimum. This leads to improved photographic image reproduction with fewer visual abnormalities for VR360 experiences, which can be adaptable into a wide range of interactive design applications. We describe the process in detail and also report on a user study that shows the proposed approach creates images which viewers prefer, on the whole, to those created using more complicated HDR methods, or to those created without the use of HDR at all.

scholarly journals ZCAM, a colour appearance model based on a high dynamic range uniform colour space

2021 ◽  
Vol 29 (4) ◽  
pp. 6036
Author(s):  
Muhammad Safdar ◽  
Jon Yngve Hardeberg ◽  
Ming Ronnier Luo
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Appearance Model ◽  
Colour Space ◽  
Model Based ◽  
High Dynamic ◽  
Colour Appearance

Physical Parameters Consistency Based 3D Temperature Field Reconstruction for Combustion Flame

2014 ◽  
Vol 986-987 ◽  
pp. 852-857 ◽  
Author(s):  
Xu Guang Wang ◽  
Hai Peng Zhang
Keyword(s):  
Temperature Field ◽  
Dynamic Range ◽  
Flame Temperature ◽  
High Dynamic Range ◽  
Refraction Index ◽  
Lookup Table ◽  
Physical Parameters ◽  
High Dynamic ◽  
The Relationship ◽  
Temperature Field Reconstruction

We present a novel solution to accurately recover 3D dynamic flame temperature field based on physical parameters consistency. First, a new optical model is proposed to establish the relationship between the flame radiation and the radiance field, this model fully considers refractive effect caused by refraction index changing; Second, high dynamic range (HDR) cameras are used to take flame images, a lookup table is employed calculate temperature from radiance; Third, an algorithm is put forward to reconstruct the flame temperature field. Experimental results on real flame accord with physical facts, which demonstrate that our solution is validate.

scholarly journals Perceptually motivated model for predicting banding artefacts in high-dynamic range images

2020 ◽  
Vol 2020 (28) ◽  
pp. 42-48
Author(s):  
Minjung Kim ◽  
Maryam Azimi ◽  
Rafał K. Mantiuk
Keyword(s):  
Visual System ◽  
Contrast Sensitivity ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Sensitivity Function ◽  
Psychophysical Experiment ◽  
Texture Region ◽  
Wide Range ◽  
Artefact Detection ◽  
High Dynamic

Banding is a type of quantisation artefact that appears when a low-texture region of an image is coded with insufficient bitdepth. Banding artefacts are well-studied for standard dynamic range (SDR), but are not well-understood for high dynamic range (HDR). To address this issue, we conducted a psychophysical experiment to characterise how well human observers see banding artefacts across a wide range of luminances (0.1 cd/m2–10,000 cd/m2). The stimuli were gradients modulated along three colour directions: black-white, red-green, and yellow-violet. The visibility threshold for banding artefacts was the highest at 0.1 cd/m2, decreased with increasing luminance up to 100 cd/m2, then remained at the same level up to 10,000 cd/m2. We used the results to develop and validate a model of banding artefact detection. The model relies on the contrast sensitivity function (CSF) of the visual system, and hence, predicts the visibility of banding artefacts in a perceptually accurate way.

scholarly journals SPAD-Based LiDAR Sensor in 0.35 µm Automotive CMOS with Variable Background Light Rejection

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 749 ◽  
Author(s):  
Maik Beer ◽  
Charles Thattil ◽  
Jan F. Haase ◽  
Jennifer Ruskowski ◽  
Werner Brockherde ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Light Condition ◽  
High Dynamic Range ◽  
Cmos Process ◽  
Ambient Light ◽  
Wide Range ◽  
Constant Measurement ◽  
Ambient Light Condition ◽  
High Dynamic ◽  
Individual Adjustment

We present a SPAD-based LiDAR sensor fabricated in an automotive certified 0.35 µm CMOS process. Since reliable sensor operation in high ambient light environment is a crucial factor in automotive applications, four SPADs are implemented in each pixel to suppress ambient light by the detection of photon coincidences. By pixel individual adjustment of the coincidence parameters to the present ambient light condition, an almost constant measurement performance is achieved for a wide range of different target reflectance and ambient illumination levels. This technique allows the acquisition of high dynamic range scenes in a single laser shot. For measurement and demonstration purpose a LiDAR camera with the developed sensor has been built.

Sign in / Sign up

Export Citation Format

Share Document