Relevant bibliographies by topics / Light culling

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Light culling'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Light culling"

1

Yang, Qinqi, Zhuxin Chen, Yanli Liu, Guanyu Xing, and Yanci Zhang. "Foveated light culling." Computers & Graphics 97 (June 2021): 200–207. http://dx.doi.org/10.1016/j.cag.2021.04.021.

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PAGÉ, SYLVAIN, JEAN-PIERRE CHARUEST, and JACQUES J. DUFOUR. "EFFET DE L'IMPOSITION DE DEUX RÉGIMES LUMINEUX À DEUX STADES PHYSIOLOGIQUES SUR LE TAUX DE RÉFORME POUR ANOESTRUS ET NON GESTATION CHEZ LA COCHETTE ET LA TRUIE." Canadian Journal of Animal Science 68, no. 4 (December 1, 1988): 1001–14. http://dx.doi.org/10.4141/cjas88-115.

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During a 3-yr period, Landrace-Yorkshire gilts of an average age of 225 d were randomly assigned to 4 h light — 20 h dark (4) or 16 h light — 8 h dark (16), as they entered the herd. In the gestation room (G), the two light treatments were maintained until culling or 1 wk prior to farrowing. For the lactation period (L), the gilts were either maintained on the same light treatment as the gestation or switched to the opposite one before going back again at weaning to the light treatment received in gestation. Four light treatments were then formed, namely: G4-L4, G4-L16, G16-L4 and G16-L16 and the practical consequences of such light regimens evaluated in a commercial herd. In gilts, the culling rate for anestrus (at 304 d of age) was 6.6% for the 956 gilts available for the study and was unaffected by photoperiod imposed during gestation. The culling rate for failure to maintain pregnancy was 4.7% for the 1150 gilts available and was higher (P < 0.01) in gilts exposed to the 4 h light (G4). In primiparous sows, the culling rates for anestrus (40 d after weaning) and failure to maintain pregnancy were 10.7% and 6.2%, respectively, for the 475 and 678 sows available for the study. The culling rates for anestrus and failure to maintain pregnancy were higher for sows exposed to the 16 h light in lactation (L16, P < 0.06 and P < 0.02, respectively). After two and three farrowings, the culling rates were negligible for all treatments. Among females culled for anestrus, 62% of gilts and 58% of primiparous sows showed luteal structures (corpora lutea and/or corpora albicantia) at slaughter and were unaffected by treatments. Among females culled for anestrus and failure to maintain pregnancy, 24% of gilts and 19% of primiparous sows had genital abnormalities. These data indicate that the effect of photoperiod on the culling rate for reproductive failure in swine was dependent upon parity and physiological stage at which it is imposed. Key words: Gilt, sow, photoperiod, culling, anestrus, failure to maintain pregnancy
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Tokuyoshi, Yusuke, and Takahiro Harada. "Stochastic Light Culling for VPLs on GGX Microsurfaces." Computer Graphics Forum 36, no. 4 (July 2017): 55–63. http://dx.doi.org/10.1111/cgf.13224.

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Macnab, John. "Does game cropping serve conservation? A reexamination of the African data." Canadian Journal of Zoology 69, no. 9 (September 1, 1991): 2283–90. http://dx.doi.org/10.1139/z91-320.

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Commercial culling of wildlife species in natural habitats (game cropping) or in fenced areas (game farming) has been suggested as a means of conserving such species in North America. An alternative hypothesis proposes that such exploitation may have an adverse impact on these species and other species associated with them. Commercial exploitation uses the precedent of African cropping projects originally set up for conservation. This review examines the biological and economic evidence from Africa in the light of these two hypotheses. The biological evidence is now seen to suggest that domestic ungulates are more productive than wild species in medium-rainfall natural habitats of Africa. Game farming, which provides luxury products (meat), and services (tourism, hunting) to foreigners, is more productive than game cropping which tries to provide cheap meat to low-income native peoples. The economic evidence in favour of cropping is drawn from culling programs for management in national parks, and from private ranches in southern Africa. However, these park culling schemes subsidized costs and were not intended for profit, whereas private ranches sold to luxury markets and were subsidized by tourism and sport hunting. Although many private game farms are a commercial success, their value for conservation is limited. There may also be some negative effects on conservation.
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Lewis, P. D., G. C. Perry, and C. M. Sherwin. "Effect of intermittent light regimens on the performance of intact male turkeys." Animal Science 67, no. 3 (December 1998): 627–36. http://dx.doi.org/10.1017/s1357729800033075.

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AbstractAn 8-h photoperiod, compared with 12-, 16- or 23-h photoperiods, has been shown to reduce the incidence of injurious pecking and leg problems in intact male turkeys but to result in lower body weights, slower sexual development and less efficient food conversion. The effect of 8 h of illumination given as a solid photoperiod, as eight 1-h periods equally spread through the 24 h or concentrated into a 12-h part of the day on the performance of BUT 8 intact male turkeys was investigated.Fragmentation of the daily illumination increased body weight, improved food conversion efficiency but did not significantly affect food intake. Increased sexual displaying and significantly better food conversion between 16 and 20 weeks by the two intermittently illuminated groups strongly suggested that both regimens were interpreted as stimulatory daylengths. Generally, losses due to mortality and culling were higher in both fragmented groups, while injurious pecking was higher in 8(1L: ID) birds before 5 weeks and in birds given a 12-h ‘subjective day’ after 5 weeks than in 8-h controls. Culling due to leg problems was significantly higher in birds on the 8(1L:2D) regimen but the incidence of leg imperfections was minimal (< 0·037) in all groups. Both intermittent groups but the 8(1L: 2D) in particular, showed a reduced response to hand movement across the eyes compared with 8-h controls. The controls ate proportionately more food during their 16-h dark period than did the intermittent group during their 12-h ‘subjective night’, though both groups increased their ‘nocturnal’ feeding with age.
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Abdul Salam, Khairunnasriah. "Culling of Stray Dogs as a Mean to Eliminate Rabies Transmission: An Analysis from Malaysian and Islamic Law Perspective with Special Reference to Ḥifz Al-Nafs (Protection of Life)." Jurnal Islam dan Masyarakat Kontemporari 19 (September 11, 2018): 17–32. http://dx.doi.org/10.37231/jimk.2018.19.0.280.

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This paper aims to examine the position of culling of stray dogs during the 2015 rabies outbreak in Malaysia as a measure to eliminate rabies transmission from the perspective Malaysian legal framework and Islamic law with special reference to ḥifz al-nafs (protection of life). For that purpose, this paper discusses the Malaysian law and policy pertaining to rabies and rabies control as stated in two Malaysian statutes, namely Animals Act 1953 (Act 647), Animals (Amendment) Act 2013 (Act A1452) and Prevention and Control of Infectious Diseases Act 1988 (Act 342). It further analyses the position of culling of stray dogs in eliminating transmission of rabies from the Islamic law perspective by applying the concept of maṣlaḥah mursalah (consideration of public interest) and sadd al-dharā’iʿ (blocking the means) in order to analyze the measure within the framework of maqāṣid al-Sharīʿah (objectives of Sharīʿah) in general, and ḥifzʿala al-nafs (protection of life) in particular. In the light of these objectives, it also evaluates the position of culling of stray dogs by outweighing the situation when the life of human were in conflict with the life of animals (i.e. stray dogs) using the Islamic legal maxim. This paper concludes that the position of culling of stray dogs as a measure in eliminating rabies transmission is permissible (mubaḥ) in order to protect the public interest and to remove hardship in the society based on the evaluated determinant factors within the determined time scope, that are: i) the Malaysian experience and condition during the rabies outbreak; ii) the shortage of rabies vaccine in Malaysia during the outbreak; iii) the vital nature of the rabies virus; iv) the nature and habit of stray dogs as the main host of rabies virus; v) the nature of the conflicted harms between the harm to human and harm to stray dogs. It further concludes that the measure is important to protect the public health which consequently significant to achieve the social harmony.
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shihan, Tan, Zhang jianwei, Lin yi, Liu hong, Yang menglong, and Ge wenyi. "Adaptive volumetric light and atmospheric scattering." PLOS ONE 15, no. 11 (November 18, 2020): e0242265. http://dx.doi.org/10.1371/journal.pone.0242265.

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An adaptive sampling-based atmospheric scattering and volumetric light framework for flight simulator (FS) is proposed to enhance the immersion and realism in real-time. The framework comprises epipolar sampling (ES), visible factor culling (VFC), interactive participating media density estimating (IPMDE). The main process of proposed architecture is as follows: the scene is divided into two levels according to the distance from the camera. In the high-level pipeline, the layer close to the camera, more samples, and smaller sampling step size is used to improve image quality. Further, the IPMDE method is designed to enhance realism by achieving interactivity with the participating media and multiple light sources. Further optimization is performed by the lookup table and 3D volumetric textures, by which we can compute the density of participating media and the scattering coefficient in parallel. In the low-level pipeline, when the samples are far away from the camera, its influence on the final output is also reduced, which results in fewer samples and a bigger sampling step size. The improved ES method further reduces the number of samples involved in ray marching using the features of epipolar geometry. It then generates global light effects and shadows of distant terrain. The VFC method uses an acceleration structure to quickly find the lit segments which eliminate samples blocked by obstacles. The experimental results demonstrate our architecture achieves a better sense of reality in real-time and is very suitable for FS.
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PATI, ARUN K. "REPLICATION AND EVOLUTION OF QUANTUM SPECIES." Fluctuation and Noise Letters 04, no. 03 (September 2004): R27—R38. http://dx.doi.org/10.1142/s0219477504002014.

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We dwell upon the physicist's conception of 'life' since Schrödinger and Wigner through to the modern-day language of living systems in the light of quantum information. We discuss some basic features of a living system such as ordinary replication and evolution in terms of quantum bio-information. We also discuss the principle of no-culling of living replicas. We show that in a collection of identical species there can be no entanglement between one of the mutated copies and the rest of the species in a closed universe. Even though these discussions revolve around 'artificial life' they may still be applicable in real biological systems under suitable conditions.
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Lucas, Scott C. "ABU BAKR IBN AL-MUNDHIR, AMPUTATION, AND THE ART OF IJTIHĀD." International Journal of Middle East Studies 39, no. 3 (August 2007): 368a. http://dx.doi.org/10.1017/s0020743807070894.

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This article introduces the legal methodology of independent mujtahid (legal scholar) Abu Bakr ibn al-Mundhir al-Naysaburi (d. 930) in order to shed light on the nature of ijtihād (independent judgment in a legal or theological question) on the eve of crystallization of the four Sunni legal schools. Ibn al-Mundhir's presentation of laws concerning punishment for theft indicates that the Qurʿan and Prophetic hadith played a modest role in early elaboration of Islamic law. Instead, the bulk of this early mujtahid's efforts were devoted to culling and evaluating legal opinions of the companions, successors, and, in particular, a small group of postsuccessor jurists. I conclude by locating Ibn al-Mundhir within the literature of juristic disagreement (ikhtilāf) and highlighting the features that make his writings exceptional within this tradition.
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Fouque, Carol, and Vincent Schricke. "Status and trends of the Canada Goose Branta canadensis in France." Ornis Svecica 21, no. 2–4 (April 1, 2011): 69–78. http://dx.doi.org/10.34080/os.v21.22601.

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An enquiry to determine the distribution and abundance of the Canada Goose Branta candensis in France was undertaken in 2008. Responses were received from 92 out of the 96 departments. Canada Geese were reported in 56 of the 92 departments, in 8 of which the species had only appeared after 2000. For half of the 56 departments, the species was observed only in summer. Canada Geese summered in 38 departments, numbering at least 4,250 birds. At least 6,000 birds are also thought to winter in France as of 2008/2009, when the species is more widespread. Winter numbers are increasing exponentially. In 5 departments, crop damage and public health issues have resulted in local management measures in the last 3 years (e.g. egg pricking and culling of adults). We discuss the need for further regulation and legislation in the light of these conflicts and hybridisation with other species.
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Dissertations / Theses on the topic "Light culling"

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Tom, William James. "Focusing Light within Turbid Media with Virtual Aperture Culling of the Eigenmodes of a Resonator." Thesis, The University of Texas at Austin, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3577696.

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Virtual aperture culling of the eigenmodes of a resonator (VACER) is a technique to focus light within turbid media at arbitrary locations. A seed pulse of light is directed through a phase-conjugate mirror (PCM) into a turbid medium. Though much of the light may be lost, any light which reaches the second PCM is phase conjugated and thus returned to the first PCM where the light will be phase conjugated again. Amplification by the PCMs can prevent decay of the light cycling between the PCMs. Introducing a mechanism which filters light based on position enables attenuation of the modes not traveling through the center of the virtual aperture resulting in a focusing of light at the center of the virtual aperture. The seed pulse and the positioning of the PCMs on opposite sides of the virtual aperture ensure that modes cannot bypass the virtual aperture. Magnetic fields and ultrasound waves are potential means for implementation of a virtual aperture. Generally, only weak filtration mechanisms like magnetic fields and ultrasound waves are innocuous to turbid media. Fortunately, weak effects can strongly cull modes in VACER because the filtration mechanism affects the modes during each pass between PCMs and the modes compete. A combination of theory and computational modeling prove that sound physical principles underlie VACER. Moreover, computational modeling reveals how mode overlap, the seed pulse, and other variables impact VACER performance. Good experimental performance is predicted.

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Örtegren, Kevin. "Clustered Shading : Assigning arbitrarily shaped convex light volumes using conservative rasterization." Thesis, Blekinge Tekniska Högskola, Institutionen för kreativa teknologier, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-10418.

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Context. In this thesis, a GPU-based light culling technique performed with conservative rasterization is presented. Accurate lighting calculations are expensive in real-time applications and the number of lights used in a typical virtual scene increases as real-time applications become more advanced. Performing light culling prior to shading a scene has in recent years become a vital part of any high-end rendering pipeline. Existing light culling techniques suffer from a variety of problems which clustered shading tries to address. Objectives. The main goal of this thesis is to explore the use of the rasterizer to efficiently assign convex light shapes to clusters. Being able to accurately represent and assign light volumes to clusters is a key objective in this thesis. Methods. This method is designed for real-time applications that use large amounts of dynamic and arbitrarily shaped convex lights. By using using conservative rasterization to assign convex light volumes to a 3D cluster structure, a more suitable light volume approximation can be used. This thesis implements a novel light culling technique in DirectX 12 by taking advantage of the hardware conservative rasterization provided by the latest consumer grade Nvidia GPUs. Experiments are conducted to prove the efficiency of the implementation and comparisons with AMD´s Forward+ tiled light culling are provided to relate the implementation to existing techniques. Results. The results from analyzing the algorithm shows that most problems with existing light culling techniques are addressed and the light assignment is of high quality and allows for easy integration of new convex light types. Assigning the lights and shading the CryTek Sponza scene with 2000 point lights and 2000 spot lights takes 2.92ms on a GTX970. Conclusions. The conclusion shows that the main goal of the thesis has been reached to the extent that all existing problems with current light culling techniques have been solved, at the cost of using more memory. The technique is novel and a lot of future work is outlined and would benefit the validity of the implementation if further researched.
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J'lali, Yousra. "DirectX 12: Performance Comparison Between Single- and Multithreaded Rendering when Culling Multiple Lights." Thesis, Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-20201.

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Background. As newer computers are constructed, more advanced and powerful hardware come along with them. This leads to the enhancement of various program attributes and features by corporations to get ahold of the hardware, hence, improving performance. A relatively new API which serves to facilitate such logic, is Microsoft DirectX 12. There are numerous opinions about this specific API, and to get a slightly better understanding of its capabilities with hardware utilization, this research puts it under some tests. Objectives. This article’s aim is to steadily perform tests and comparisons in order to find out which method has better performance when using DirectX 12; single-threading, or multithreading. For performance measurements, the average CPU and GPU utilizations are gathered, as well as the average FPS and the speed of which it takes to perform the Render function. When all results have been collected, the comparison between the methods are assessed. Methods. In this research, the main method which is being used is experiments. To find out the performance differences between the two methods, they must undergo different trials while data is gathered. There are four experiments for the single-threaded and multithreaded application, respectively. Each test varies in the number of lights and objects that are rendered in the simulation environment, gradually escalading from 50; then 100; 1000; and lastly, 5000. Results. A similar pattern was discovered throughout the experiments, with all of the four tests, where the multithreaded application used considerably more of the CPU than the single-threaded version. And despite there being less simultaneous work done by the GPU in the one-threaded program, it appeared to be using more GPU utilization than multithreading. Furthermore, the system with many threads tended to perform the Render function faster than its counterpart, regardless of which test was executed. Nevertheless, both applications never differed in FPS. Conclusion. Half of the hypotheses stated in this article were contradicted after some unexpected tun of events. It was believed that the multithreaded system would utilize less of the CPU and more of the GPU. Instead, the outcome contradicted the hypotheses, thus, opposing them. Another theory believed that the system with multiple threads would execute the Render function faster than the other version, a hypothesis that was strongly supported by the results. In addition to that, more objects and lights inserted into the scene did increased the applications’ utilization in both the CPU and GPU, which also supported another hypothesis. In conclusion, the multithreaded program performs faster but still has no gain in FPS compared to single-threading. The multithreaded version also utilizes more CPU and less GPU
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Tom, William James. "Focusing light within turbid media with virtual aperture culling of the eigenmodes of a resonator." 2012. http://hdl.handle.net/2152/19998.

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Virtual aperture culling of the eigenmodes of a resonator (VACER) is a technique to focus light within turbid media at arbitrary locations. A seed pulse of light is directed through a phase-conjugate mirror (PCM) into a turbid medium. Though much of the light may be lost, any light which reaches the second PCM is phase conjugated and thus returned to the first PCM where the light will be phase conjugated again. Amplification by the PCMs can prevent decay of the light cycling between the PCMs. Introducing a mechanism which filters light based on position enables attenuation of the modes not traveling through the center of the virtual aperture resulting in a focusing of light at the center of the virtual aperture. The seed pulse and the positioning of the PCMs on opposite sides of the virtual aperture ensure that modes cannot bypass the virtual aperture. Magnetic fields and ultrasound waves are potential means for implementation of a virtual aperture. Generally, only weak filtration mechanisms like magnetic fields and ultrasound waves are innocuous to turbid media. Fortunately, weak effects can strongly cull modes in VACER because the filtration mechanism affects the modes during each pass between PCMs and the modes compete. A combination of theory and computational modeling prove that sound physical principles underlie VACER. Moreover, computational modeling reveals how mode overlap, the seed pulse, and other variables impact VACER performance. Good experimental performance is predicted.
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Book chapters on the topic "Light culling"

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Billson, Anne. "The Vampire’s Lifestyle." In Let the Right One In, 87–90. Liverpool University Press, 2011. http://dx.doi.org/10.3828/liverpool/9781906733506.003.0011.

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This chapter discusses traditional vampires that live in large cob-webbed castles or crumbling stately mansions or sometimes dabble in real estate or property development, such as in the film The Satanic Rites of Dracula in 1973. The chapter points out how vampires are generally depicted as wealthy individuals who rarely have to worry about income or housing. It also considers the Twilight movies, where the Cullen 'family' resides not in a castle or old dark house but an airy modern Frank Lloyd Wright-esque home. The chapter reviews the character Eli in Tomas Alfredson's Let the Right One In, who contents herself with a bog-standard flat on a Swedish housing estate where she customizes the bathroom to turn it into a light-tight nest. It explores Eli and Håkan's flat that bears all the hallmarks of an environment where the occupants have lost interest in the superficial trappings of life.
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Conference papers on the topic "Light culling"

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Tokuyoshi, Yusuke, and Takahiro Harada. "Bidirectional path tracing using backward stochastic light culling." In SIGGRAPH '18: Special Interest Group on Computer Graphics and Interactive Techniques Conference. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3214745.3214750.

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Wenhui Zhou, Andrew Lumsdaine, and Lili Lin. "Depth estimation with cascade occlusion culling filter for light-field cameras." In 2016 23rd International Conference on Pattern Recognition (ICPR). IEEE, 2016. http://dx.doi.org/10.1109/icpr.2016.7899912.

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