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Academic literature on the topic 'Colour aberration'

Author: Grafiati

Published: 5 June 2025

Last updated: 16 July 2025

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Journal articles on the topic "Colour aberration"

Bora, Neeraj, Chiranjib Bora, Smiti Rekha Sharma, and Jyotismita Das. "First photographic record of a colour aberrant Spotted Dove Spilopelia chinensis from the Brahmaputra valley of Assam, India." Ornis Hungarica 32, no. 1 (2024): 238–42. http://dx.doi.org/10.2478/orhu-2024-0018.

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Abstract Colour aberrations are rare conditions in birds that are caused by genetic as well as environmental factors. Among the colour aberrations in birds, albino, leucism, progressive greying, brown, dilution, ino, and melanism are the best known. This report describes an observation of colour aberration in a Spotted Dove (Spilopelia chinensis suratensis) from India. It was recorded in the Deobali Jalah (an IBA site) of Nagaon district, Assam. The recorded individual exhibited a pale plumage with normal eyes and some light brown colour in some of the feathers, indicating this to be a form of dilution. The report also represents the first photographic documentation of colour aberration in Spotted Doves from Brahmaputra Valley of Assam, India. Further research is necessary to comprehend the causes of colour aberration in Spotted Doves.

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Lichti, D. D., D. Jarron, M. Shahbazi, P. Helmholz, and R. Radovanovic. "INVESTIGATION INTO THE BEHAVIOUR AND MODELLING OF CHROMATIC ABERRATIONS IN NON-METRIC DIGITAL CAMERAS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W18 (November 29, 2019): 99–106. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w18-99-2019.

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Abstract. Chromatic aberration in colour digital camera imagery can affect the accuracy of photogrammetric reconstruction. Both longitudinal and transverse chromatic aberrations can be effectively modelled by making separate measurements in each of the blue, green and red colour bands and performing a specialized self-calibrating bundle adjustment. This paper presents the results of an investigation with two aims. The first aim is to quantify the presence of chromatic aberration in two sets of cameras: the six individual cameras comprising a Ladybug5 system, calibrated simultaneously in air; and four GoPro Hero 5 cameras calibrated independently under water. The second aim is to investigate the impacts of imposing different constraints in the self-calibration adjustment. To this end, four different adjustment cases were performed for all ten cameras: independent adjustment of the observations from each colour band; combined adjustment of all colour bands’ observations with common object points; combined adjustment of all colour bands with common object points and common exterior orientation parameters for each colour band triplet; and combined adjustment with common object points and certain common interior orientation parameters. The results show that the Ladybug5 cameras exhibit a small (1-2 pixel) amount of transverse chromatic aberration but no longitudinal chromatic aberration. The GoPro Hero 5 cameras exhibit significant (25 pixel) transverse chromatic aberration as well as longitudinal chromatic aberration. The principal distance was essentially independent of the adjustment case for the Ladybug5, but it was not for the GoPro Hero 5. The principal point position and precision were both affected considerably by adjustment case. Radial lens distortion was invariant to the adjustment case. The impact of adjustment case on decentring distortion was minimal in both cases.

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van Grouw, Hein. "What Colour Is That Sparrow? A Case Study: Colour Aberrations In The House Sparrow Passer Domesticus." International Studies on Sparrows 36, no. 1 (2012): 30–55. http://dx.doi.org/10.1515/isspar-2015-0012.

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Abstract In this paper 16 distinct, heritable colour aberrations (mutations) in the House Sparrow are described, based on specimens found in museum collections, records of individuals seen in the wild and from bird breeders keeping aberrant coloured sparrows in captivity. Based on the frequency found in the museum specimens Brown is the most common mutation in the House Sparrow, followed by Ino and Albino. Besides the mutations there is also a, presumably, non-heritable aberration called Progressive Greying described. Progressive Greying is in fact by far the most common colour aberration found in the species but was, in the past, always assigned as ‘Partial Albino’ without its real nature being understood. This paper will give some insight in the nature of Progressive Greying.

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Mahabal, Anil, Radheshyam Murlidhar Sharma, Rajgopal Narsinha Patil, and Shrikant Jadhav. "Colour aberration in Indian mammals: a review from 1886 to 2017." Journal of Threatened Taxa 11, no. 6 (2019): 13690–719. http://dx.doi.org/10.11609/jott.3843.11.6.13690-13719.

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The phenomena of colour aberration (albinism, leucism, piebaldism, melanism, hypomelanism, and blue-eyed colour morph) is reported in various mammalian species throughout the world including India. A total of 239 such instances in Indian mammals was tabulated in this study along with maps showing locations of the records. The records from 1886 to 2017 (till July) were gathered from published scientific literature, magazines, and images uploaded on various websites. The records were reviewed along with their order-wise and family-wise representation and were analyzed. Appropriate identification of colour aberration was attempted on the basis of any presented evidence. Altogether, 56 (out of 421) mammalian species belonging to eight orders and 19 families were reported to exhibit various types of colour aberrations, amounting to 13.3% of the total mammalian species found in India. Of these, albinos constituted 21.8%, leucistic 14.2%, piebald 5.4%, melanistic 25.5%, hypomelanistic 18.4%, and blue-eyed white morph 1.3%; the remaining 13.4% was undetermined. The study highlights 1) the absence of records of colour aberrations in the largest mammal family Vespertilionidae, which contrasts with studies elsewhere, 2) the persistent occurrence of albinos in Spotted Deer and Blackbucks in Gujarat, 3) the high number of melanistic leopards in India over the years and recent instances of melanistic Asian Golden Cats in Sikkim, 4) regular records of hypomelanism in Gaurs of the southern Western Ghats except in the last few years. Overall, a need for further studies in colour aberration in mammals is urged.

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Alby, Mattathil Jacob, Cheruthottunkara Purushothaman Ashwin, and Moolumkudy Suresh Arjun. "A photographic record of partial leucism in Greater Coucal Centropus sinensis (Stephens, 1815) (Cuculiformes: Cuculidae) from Chhattisgarh, India." Ornis Hungarica 31, no. 1 (2023): 197–201. http://dx.doi.org/10.2478/orhu-2023-0013.

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Abstract Leucism is a colour anomaly defined by a lack of pigmentation, which may be partial or full in any individual. Although genetic and environmental factors contribute to a high incidence of plumage colour aberrations in wild birds, the true incidence of these aberrations in wild populations has been studied very less. The present report describes an instance of partial leucism in a Greater Coucal (Centropus sinensis) from Chhattisgarh, India. This colour aberration in this species was first documented in 1990. More research is needed to determine the exact reasons for the high incidence of partial leucism in wild birds, which might include nutrition, lifespan, behaviour, parasitism, or other environmental factors.

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Monish, Kumar Thapa, Kalita Ritu, and Jyoti Das Hirak. "First record of brown colour aberration in Red-Vented Bulbul from Assam." Zoo's Print 38, no. 9 (2023): 35–36. https://doi.org/10.5281/zenodo.8367013.

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Ashwin, C.P, M.S Arjun, and Joy Angel. "Plumage aberration observation in House Crow (Corvussplendens) in Coimbatore district of Tamil Nadu, India." Biolife 10, no. 1 (2022): 1–2. https://doi.org/10.5281/zenodo.7407989.

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ABSTRACT Plumage anomalies in birds are more prevalent in India, where numerous studies have lately been published. We show an instance of brown plumage aberration in a Common House Crow (Corvussplendens) in this report. The plumage of the Common House Crow has been documented in a variety of morphs, the majority of which are examples of lucistic and other aberrations. However, the brown aberration observed by us was unusual and has been discussed. Key words:Plumage, brown, aberration, morphs, lucistic REFERENCES Arockianathan, Samson & Princy, J., 2020. A record on colour aberration in Fulvous-breasted Woodpecker in, Himachal Pradesh, India. Zoos' Print Journal 35: 42-44. Dharmakumarsinhji, R. S., 1975. A Whiteheaded duck. Newsletter for Birdwatchers 15(1): 9. Flood, R. L., & Van Grouw, H., 2015. Unfamiliar plumage types of Fulmars in the North Atlantic. Brit. Birds 108: 331-348. Forrest, S. C., & Naveen, R., 2000. Prevalence of leucism in pygocelid penguins of the Antarctic peninsula. Waterbirds, 283-285. Frainer, G., Daudt, N. W., & Carlos, C. J., 2015. Aberrantly plumaged White-chinned Petrels Procellaria aequinoctialis in the Brazilian waters, south-west Atlantic Ocean. Marine Biodiversity Records, 8. Hume, J. P., & van Grouw, H., 2014. Colour aberrations in extinct and endangered birds. Kale, T., 2006. White Crow on the bank of Ujani Dam. ‘Loksatta’ News Paper, Pune edition, 9 September 2006. Mahabal, A. N. I. L., Sharma, R. M., & Sayyed, A. M. I. T., 2015. Colour aberrations in Indian birds. Birding Asia 24: 19-121. Swapna Gurrapu and Estari Mamidala. In vitro HIV-Reverse Transcriptase Inhibition of Andrographolide Isolatedfrom Andrographis Paniculata. European Journal of Biomedical and Pharmaceutical Sciences. 2017. Volume 4, Issue 12. 516-522. Mancini, P. L., Jiménez, S., Neves, T., & Bugoni, L., 2010. Records of leucism in albatrosses and petrels (Procellariiformes) in the South Atlantic Ocean. Revista Brasileira de Ornitologia 18(3): 245-248. Owen, M., & Skimmings, P., 1992. The occurrence and performance of leucistic Barnacle Geese Branta leucopsis. Ibis 134(1): 22-26. Parasharya, B.M., Chauhan, R.B. and Sukhadia, A.G., 1996. A white coot at Kanewal, Gujarat. Journal-Bombay Natural History Society 93: 586-586. Petry, M. V., Corrêa, L. L. C., Benemann, V. R. F., & Werle, G. B., 2017. Brown plumage aberration records in Kelp Gull (Larus dominicanus) and Magellanic Penguin (Spheniscus magellanicus) in southern Brazil. Revista Brasileira de ornitologia 25(2): 125-127. Roy, A., 2010. AVES-7 Sighting of a rare dark morph of Grey Francolin Francolinus pondicerianus Gmelin 1789 near Surendranagar, Gujarat, India. Journal of the Bombay Natural History Society 107(3): 249. Ryall, C., 2016. Further records and updates of range expansion in House Crow Corvus splendens. Bull BOC 136: 39-45. Sage, B. L., 1963. The incidence of albinism and melanism in British birds. British birds 56(11): 409-416. Urcola, M. R., 2011. Aberraciones cromáticas en aves de la colección ornitológica del Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”. Revista del Museo Argentino de Ciencias Naturales 13(2): 221-228. Van Grouw, H., 2006. Not every white bird is an albino: sense and nonsense about colour aberrations in birds. Dutch Birding 28(2): 79-89. Van Grouw, H., 2012. What colour is that sparrow? A case study: colour aberrations in the house sparrow Passer domesticus. Van Grouw, H., 2013. What colour is that bird. British birds 106: 17-29. Van Grouw, H., 2018. White feathers in black birds. Van Grouw, H., Russell, S., & Merne, O. J., 2011. Notes on colour aberrations in Common Guillemot Uria aalge and Northern Gannet Morus bassanus. Seabird 24: 33-41.

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Rabbe, M. F., M. M. Alam, M. F. Jaman, M. S. Hossain, K. N. M. Sarafat, and A. R. Shome. "Chromatic leucism in the flap shell turtle, Lissemys punctata from Bangladesh." Taprobanica 10, no. 2 (2021): 131. http://dx.doi.org/10.47605/tapro.v10i2.264.

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The spotted flap shell turtle, Lissemys punctata (Bonnaterre, 1789) has a distribution in Bangladesh, India, Myanmar, Nepal and Pakistan. In Bangladesh, this species is widely distributed throughout the freshwater wetlands and the low-lying floodplains, coastal islands, and hill districts. This species is listed in CITES (Appendix II) and protected by Bangladesh Wildlife Conservation & Security Act 2012 (Schedule II), where commercial trade is strictly prohibited. Lissemys punctata has an oval and domed carapace with olive-green colour spotted by dark yellow blotches. The head is also olive green often with yellow blotches, whereas the plastron is whitish or pale yellow. The colour of this species may vary depending on its habitat and defence strategy. Colour aberration in animals may occur due to a lack of melanin. Golden yellow colour aberration (chromatic leucism) is rare in animals, especially in turtles. This might be because of the absence of melanin in the outer dermis. The presence of high xanthophores and yellow pteridine pigments in the skin are also responsible for the golden yellow colour aberration.

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Faubert, Jocelyn, Lynda Bilodeau, and Pierre Simonet. "Transverse chromatic aberration and colour-defined motion." Ophthalmic and Physiological Optics 20, no. 4 (2000): 274–80. http://dx.doi.org/10.1046/j.1475-1313.2000.00532.x.

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Faubert, J. "Transverse chromatic aberration and colour-defined motion." Ophthalmic and Physiological Optics 20, no. 4 (2000): 274–80. http://dx.doi.org/10.1016/s0275-5408(99)00096-4.

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Dissertations / Theses on the topic "Colour aberration"

Gupta, Preeti. "Change in colour appearance of small defocused lights." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/30424/1/Preeti_Gupta_Thesis.pdf.

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Small long wavelength lights (≤ 1’ arc) change colour appearance with positive defocus, appearing yellow or white. I investigated influences of longitudinal chromatic aberration and monochromatic aberrations on colour appearance of small narrow band lights. Seven cyclopleged participants viewed a small light (1’ arc diameter, λmax range 510 - 628 nm) centred within a 4.6’ black annulus and surrounded by a uniform white field under photopic light levels. An optical trombone varied focus. Participants were required to vary the focus by moving the optical trombone in either positive or negative direction and report when they noticed a change in appearance of the defocused narrow band light. Longitudinal chromatic aberration was controlled using a Powell achromatizing lens and its doublet and triplet components that neutralized, doubled and reversed the eye’s chromatic aberration, respectively. Changes in colour appearance for a 628 nm light occurred without any lens at +0.5 ± 0.2D defocus and with the doublet at +0.6 ± 0.2 D. The achromatizing lens did not affect appearance and the phenomenon was evident with the triplet for negative defocus (-0.5 ± 0.3 D). Adaptive optics correction of astigmatism and higher order monochromatic aberration did not affect magnitude significantly. Colour changes occurred despite a range of participant L/M cone ratios. Direction of change in colour appearance was reversed for short compared to long wavelengths. We conclude that longitudinal chromatic aberrations, but not monochromatic aberrations, are involved in changing appearance of small lights with defocus. Additional neuronal mechanisms that may contribute to the colour changes are considered.

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Kondo, Masahiko. "Diverse p53 gene aberration in hepatocellular carcinoma detected by dual-color fluorescence in situ hybridization." Kyoto University, 2004. http://hdl.handle.net/2433/147542.

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Berner, Andrea [Verfasser], Herbert [Gutachter] Gross, Alois [Gutachter] Herkommer, and Burkhard [Gutachter] Fleck. "Theory and application of induced higher order color aberrations / Andrea Berner ; Gutachter: Herbert Gross, Alois Herkommer, Burkhard Fleck." Jena : Friedrich-Schiller-Universität Jena, 2020. http://d-nb.info/1213348803/34.

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Huisman, Maximiliaan. "Vision Beyond Optics: Standardization, Evaluation and Innovation for Fluorescence Microscopy in Life Sciences." eScholarship@UMMS, 2019. https://escholarship.umassmed.edu/gsbs_diss/1017.

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Fluorescence microscopy is an essential tool in biomedical sciences that allows specific molecules to be visualized in the complex and crowded environment of cells. The continuous introduction of new imaging techniques makes microscopes more powerful and versatile, but there is more than meets the eye. In addition to develop- ing new methods, we can work towards getting the most out of existing data and technologies. By harnessing unused potential, this work aims to increase the richness, reliability, and power of fluorescence microscopy data in three key ways: through standardization, evaluation and innovation. A universal standard makes it easier to assess, compare and analyze imaging data – from the level of a single laboratory to the broader life sciences community. We propose a data-standard for fluorescence microscopy that can increase the confidence in experimental results, facilitate the exchange of data, and maximize compatibility with current and future data analysis techniques. Cutting-edge imaging technologies often rely on sophisticated hardware and multi-layered algorithms for reconstruction and analysis. Consequently, the trustworthiness of new methods can be difficult to assess. To evaluate the reliability and limitations of complex methods, quantitative analyses – such as the one present here for the 3D SPEED method – are paramount. The limited resolution of optical microscopes prevents direct observation of macro- molecules like DNA and RNA. We present a multi-color, achromatic, cryogenic fluorescence microscope that has the potential to produce multi-color images with sub-nanometer precision. This innovation would move fluorescence imaging beyond the limitations of optics and into the world of molecular resolution.

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Zahn, Susanne [Verfasser]. "Etablierung und Vergleich von Multi-Colour-Fish-Techniken und Multiplex- amplifiable-Probe-Hybridisation (MAPH) zur Detektion kryptischer Aberrationen der subtelomerischen Chromosomenregionen / vorgelegt von Susanne Zahn." 2004. http://d-nb.info/971789363/34.

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Tung, Chun-ping, and 東峻平. "The Development and Research on Using Image Processing Technology and Optimization Multi-Class Support Vector Machines in the Light-Emitting Diodes Chip Surface Color Aberration and Micro-Defects Inspection System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/87932414796951017206.

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碩士 國立臺灣科技大學 自動化及控制研究所 100 This study entitled “The Development and Research on Using Image Processing Technology and Optimization of Multi-Class Support Vector Machines in Light-emitting Diode (LED) Chip Surface Color Aberration and Micro-defect Detection System” aimed to propose the optimization design of the automatic system at the detection stage of the chip manufacturing process, covering LED chip color aberration image processing, chip location, defective feature extraction. Based on the defect, the defects of the tested chip can be divided into shape defects (chip surface collapse and loss), the light emitting area defects (light emitting area surface color differences, the light emitting area damage) and the electrode area defects (electrode scratching, electrode contamination, lack of pin marks in the electrode, finger fracture) by area. This study used the shape-base template matching for color aberration image chip location, and used the calculation result of the shape correlation coefficient as the feature to distinguish the chips of damaged surface structure. After the chip location, this study employed the Gaussian smoothing minimal threshold segmentation approach, Otsu threshold segmentation method, and morphology and image subtraction to mark the defects, and calculate the defective features, including the binarized features and the grayscale features. Finally, the Taguchi method and the principal component analysis method were applied to analyze the defective features, reduce the classification data amount and dimensions. With the analyzed defect characteristics as the training basis for decision tree support vector machine, this study established the optimization multi-class support vector machines classification module to further distinguish the micro defects in the electrode area and the light emitting area. Comparison was made with the traditional binary structure support vector machines, neural network classifiers. The results suggested that the overall recognition rate of the inspection system can be more than 96% and the classification of defects in 500 chips takes only 3 sec, verifying that the system can effective locate the chip and obtain reliable defect information. The design can successfully overcome the shortcoming of the automatic defect inspection system in terms of color aberration image to establish a robust inspection procedure even under interference. Meanwhile, the defect classification is characterized by fast speed, high accuracy and high reliability. Therefore, it can be effectively applied in the precision inspection of mass-produced LED chips to replace the existing human eye inspection to save labor costs.

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Books on the topic "Colour aberration"

Aberrations in black: Toward a queer of color critique. University of Minnesota Press, 2004.

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Aberrations in Black: Toward a Queer of Color Critique. University of Minnesota Press, 2013.

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Ferguson, Roderick A. Aberrations in Black: Toward a Queer of Color Critique. University of Minnesota Press, 2003.

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Ferguson, Roderick A. Aberrations in Black: Toward a Queer of Color Critique (Critical American Studies Series). University of Minnesota Press, 2003.

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Book chapters on the topic "Colour aberration"

McKeefry, D. J., and J. J. Kulikowski. "Psychophysical and occipital responses to aberration-free blue/yellow and red/green gratings." In Colour Vision Deficiencies XII. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0507-1_47.

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Lambert, G., J. Gautier, C. P. Hauri, et al. "An intense kHz and aberration-free two-colour high harmonic source for seeding FEL and XRL." In Springer Proceedings in Physics. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1186-0_21.

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Shin, Seong-yoon, Yang-Won Rhee, Dai-Hyun Jang, Sangwon Lee, Hyun-Chang Lee, and Chan Yong Jin. "Relationship Between Car Color and Car Accident on the Basis of Chromatic Aberration." In Lecture Notes in Electrical Engineering. Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6516-0_6.

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Snellenburg, Joris, Maarten Huijbregtse, Benhur Ortiz-Jaramillo, Masmei Ginting, and Ernst Serfontein. "Cassini Corneal Topographer." In Intraocular Lens Calculations. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-50666-6_31.

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AbstractCassini is a reflection-based corneal topographer, that combines its signature color-coded LED pattern with a multitude of infrared LEDs to produce a detailed and highly accurate analysis of both the anterior and posterior corneal surface – even under challenging circumstances such as non-rotationally symmetric corneas or a non-standard corneal ratio. It provides cataract surgeons with the insights needed to tailor their surgical plans and IOL selection, which in turn provides their patients with more comfort and better surgical outcomes. Featuring among others; anterior, posterior and total corneal astigmatism; higher order aberrations and topographic maps; pupil and iris morphology; ocular surface (tear film) dynamics; Cassini allows for careful Toric or Multifocal lens selection and surgery planning. Its connectivity to a wide range of surgical devices, like FLACS systems and surgical microscopes, facilitates precise IOL alignment and brings astigmatism management to the operating room.

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Trapezov, O. V., S. V. Fomin, and N. S. Fomina. "Similarity of coat color aberrations in northern fur seal (Callorhinus ursinus), mink (Neovison vison), and sable (Martes zibellina)." In Proceedings of the Xth International Scientific Congress in fur animal production. Wageningen Academic Publishers, 2012. http://dx.doi.org/10.3920/978-90-8686-760-8_44.

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"Colour Plates." In Aberration-Corrected Analytical Transmission Electron Microscopy. John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781119978848.ins.

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"Lens aberrations and image irradiance." In Introduction to Color Imaging Science. Cambridge University Press, 2005. http://dx.doi.org/10.1017/cbo9780511614392.011.

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Zimmerman, Brandon. "Anatomical Deuteranopia." In Dissection Photography. Policy Press, 2024. http://dx.doi.org/10.1332/policypress/9781529222180.003.0012.

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Collectively, dissection photographs demonstrate a pervasive attribute of aberration that breeds frequent visual and cultural misunderstandings over the color and tonal value of a cadaver’s skin. For example, during the era of the dissection photograph, red was recorded by the camera as near black. Thus, using the cadaver’s photographic appearance as the sole means of determining a cadaver’s race is a method replete with error and misconception. Complications are compounded once we include additional variables, such as improper embalming techniques, or the body’s natural processes of decomposition. This chapter explores how photography is not an entirely truthful medium, and why caution should be taken when using extant dissection photographs as a reliable witness of racist acts toward communities of color in the dissecting room.

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Herring, George C. "The War of 1898, the New Empire, and the Dawn of the American Century, 1893–1901." In From Colony To Superpower. Oxford University PressNew York, NY, 2008. http://dx.doi.org/10.1093/oso/9780195078220.003.0009.

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Abstract The great transformation in U.S. foreign relations that began in the Gilded Age culminated in the 1890s. During that tumultuous decade, the pace of diplomatic activity quickened. Americans took greater notice of events abroad and more vigorously asserted themselves in defense of perceived interests. The war with Spain in 1898 and the acquisition of overseas colonies have often been viewed as accidents of history, departures from tradition, “the great aberration,” in historian Samuel Flagg Bemis’s words, “empire by default,” according to a more recent writer.1 In fact, the United States in going to war with Spain acted much more purposefully than such interpretations allow. To be sure, the nation broke precedent by acquiring overseas colonies with no intention of admitting them as states. At the same time, in its aims, its methods, and the rhetoric used to justify it, the expansionism of the 1890s followed logically from earlier patterns, built on established precedents, and gave structure to the blueprint drawn up by James G. Blaine in the previous decade.

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Miszczyk Justyna and Cebulska-Wasilewska Antonina. "Retrospective Biological Dosimetry of the Absorbed Dose – Training on Estimation of the Radiation Dose of a Person Presumably Exposed to X – Ray Radiation by FISH." In NATO Science for Peace and Security Series - E: Human and Societal Dynamics. IOS Press, 2010. https://doi.org/10.3233/978-1-60750-645-4-329.

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It is well known that fluorescence in situ hybridization (FISH) is a powerful method largely used for detecting many chromosomal rearrangements and translocations, which are important biomarkers for the dose assessment, particularly in cases of the not well defined time of the subject&rsquo;s exposure to ionizing radiation. In 2008 one person suspected himself of an accidental exposure to ionizing radiation, but the employer was informed about this accident in 2009. Here we present an example of the work, the aim of that was to estimate the absorbed dose of this presumably exposed to radiation person, in cells obtained from the subject about a one year after the accident. The aim for RADIPER participant&rsquo;s training was enabling them to learn the results of this practical application of the translocation analysis for the purpose of the retrospective biological dosimetry. Then, during the training participants were to estimate the potential dose of the exposed anonymous subject, on the base of the analysis of cellular responses given in two sets of images of the aberrations in chromosome pairs: 1, 2 and 4 (the first one set was simulating results of the overexposure, and the second one set simulating results equal to the average level of the frequencies evaluated in our research for the control group of unexposed persons), and to compare its own results of the observed and detected translocations frequency in chromosome 1 with the investigated earlier response relationship. The chromosome pairs 1, 2 and 4 were treated using the three-color FISH technique. Stable chromosomal aberration, especially translocations, were scored, in the 60 images for each investigated case, by 10 course participants and the absorbed dose was reconstructed on the basis of a calibration curve established earlier in our laboratory for lymphocytes irradiated in vitro. The simulated absorbed dose was estimated by participants below 2 Gy, with an average frequencies of the translocations observed for the overexposed example as much as 0.068 &plusmn; 0.012 and in the control as 0.033 &plusmn; 0.008 in the chromosome 1. A rather small dispersion between results of measurements obtained by participants of the course clearly demonstrate a reproducibility and great value of the FISH method in retrospective biological dosimetry of the absorbed dose. Results of the real investigations, performed in cells of the person presumable exposed to the radiation, based on frequency of translocations in chromosome 1, appeared to be in the range of frequencies observed in unexposed subjects, in a consequence, the risk of the deterministic overexposure to radiation have been excluded, however further study on a larger number of metaphases for investigated patient and analysis of the influence of endogenous and exogenous factors altering the cellular responses to radiation is needed to confirm our findings.

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Conference papers on the topic "Colour aberration"

Choo, Jung Hun, Tae-Hyun Lee, Ki-Dong Lim, et al. "Optical characteristic analysis system based on directional illumination polarized imaging for next-generation optical elements." In 3D Image Acquisition and Display: Technology, Perception and Applications. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/3d.2024.jth2a.9.

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In this paper, we propose optical characteristic analysis system based on directional illumination polarized imaging for meta lenses with large aperture. The proposed analysis system for meta lenses with large aperture are implemented by combining polarization optics and the directional illumination imaging technique of ptychography, and it can be obtained the geometric phase map of meta lens with wide FOV and high-resolution. In addition, optical properties such as Zernike polynomial aberration, color aberration, and optical distortion are calculated based on the geometric phase map.

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Shafer, David R. "Six-element lens corrected for all third-and fifth-order aberrations." In OSA Annual Meeting. Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.tht.4.

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In a well-corrected complex lens system, with a fairly fast aperture and wide field of view, the image aberrations which limit performance are usually sagittal oblique spherical aberration and higher-order Petzval curvature. Because of aberration balancing in any well-optimized design, it may not be apparent that these two 5th-order aberrations are in fact the limiting aberrations. It is not generally recognized that it is possible to correct all the 3rd and 5th-order monochromatic aberrations to zero in relatively simple designs, without aspherics. Several years ago I found an 8-element solution and more recently several 7-element designs. Now I have found two different 6-element solutions. One has no thick lenses or strong meniscus shapes and can also be corrected for axial and lateral color with no additional elements. I suspect there may be a five-lens solution, without color correction, that would involve some thick lenses.

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Herloski, Robert. "Comprehensive Theory of Primary and Secondary Color Correction of Arbitrary Optical Systems." In International Optical Design Conference. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/iodc.1994.atpm.125.

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A method of calculating and correcting primary and higher order chromatic aberrations of arbitrary optical systems is discussed. This method uses Buchdahl’s chromatic aberration theory [1] to calculate the exact chromatic aberration coefficients (axial and lateral color of any order) of a given optical system, with no restriction on element thickness or spacing. This theory is rewritten so that the color correction problem is approximated by a series of homogeneous linear equations, which can be solved by graphical or linear algebraic techniques. This formulation gives a lens designer the ability to easily and systematically choose glasses that can potentially correct the chromatic aberrations of a complex lens system. Several design examples are given that illustrate the application of this method to lens systems with finite element thicknesses and separations. It is shown that this method can directly accommodate diffractive optical elements (DOE’s) and that DOE’s can be used to correct higher order chromatic aberrations of lens systems that could not otherwise be corrected.

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Bradley, Arthur, Xiao-Xiao Zhang, and Larry Thibos. "Retinal image isoluminance is compromised by lateral and longitudinal chromatic aberration." In OSA Annual Meeting. Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.ml5.

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Although the human eye exhibits ~2 diopters of longitudinal chromatic aberration, attempts at correcting this aberration with achromatizing lenses have failed to improve visual resolution, and such corrections are rarely used in spatial vision experiments. Recently, however, it has become common practice to use achromatizing lenses when viewing color-modulated isoluminant patterns because uncorrected chromatic aberrations introduce unwanted luminance artifacts into the retinal image.

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Stone, Thomas, and Nicholas George. "Chromatic and spherical aberrations in holographic and hybrid lenses." In OSA Annual Meeting. Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.tub7.

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Longitudinal-chromatic and -spherical aberration and lateral color are considered in various all holographic and hybrid diffractive/refractive lenses. These lenses include hybrid objectives,1 dialytes, and separated configurations. Ray tracing and first-order analytic approaches are used in this analysis. Two-element hybrid dialytes are described which eliminate lateral or longitudinal chromatic aberrations. Applications of curved-holographic elements in simultaneously reducing both aberrations are discussed. A unique volume hologram aberration is discussed which is present even paraxially and is dependent only on wavelength change and element thickness. Low-scatter holograms have also been fabricated to illustrate some of these principles and to demonstrate the high-quality performance attainable.

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Vansickle, Lauren F., and Wilson S. Geisler. "Stereopsis in the absence of chromatic aberrations." In OSA Annual Meeting. Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.thk1.

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Previous studies of whether stereopsis is possible at isoluminance for red-green stimuli have been inconclusive because they did not control for chromatic aberration. A two-alternative forced choice staircase procedure was used to measure stereo (front-back) discrimination thresholds for random-dot stereograms, which had all detectable longitudinal and transverse aberrations removed by low pass filtering. Ten red to red-plus-green luminance ratios were tested. Although individual differences were apparent, the two subjects could fuse all stimuli, including those at isoluminance. Nonblurred red-green stereograms were also investigated, using the same procedure. Curiously, removing the blur enhanced the sensitivity to the isoluminant stereograms for one of the subjects but lowered sensitivity for the other subject, even though both subjects showed increased sensitivity for the unblurred mono chrome stereogram. A quantitative, ideal observer analysis was used to measure the efficiency with which color and luminance information were used in stereopsis. While one subject's visual system used color and luminance information with equal efficiency, the second subject used color in formation with less efficiency.

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Juretić, Iva, Gala Golubović, Ivana Jurič, and Stefan Đurđević. "The influence of depth of field on the appearance of chromatic aberration." In 11th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design, 2022. http://dx.doi.org/10.24867/grid-2022-p27.

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Chromatic aberration is an optical defect that causes light rays of different wavelengths to focus at different points along the optical axis of the lens. It is manifested as band of one color at frame transitions around contrasting edges in the photo. There are two types of chromatic aberration: longitudinal and lateral. Lateral chromatic aberration is the color fringing that occurs because the magnification of the image differs with wavelength. It tends to be far more visible than longitudinal. The aim of this research is to examine the influence of depth of field on the appearance of lateral chromatic aberration. For the purposes of the experiment, we used one mirrorless camera (Sony a1), while the lenses were variable. We used Sigma 85mm f/1.4 DG DN and Sigma 40mm f/1.4 to check which type of lens shows the most chromatic aberration and how much the change in f-number affects its appearance.

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Xu, Yang, Sirui Tang, and Robert W. Boyd. "Two-Color Aberration Cancellation with Stimulated Parametric Down-Conversion." In Nonlinear Optics. Optica Publishing Group, 2023. http://dx.doi.org/10.1364/nlo.2023.th2a.4.

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Free-space optical communication is susceptible to aberration. We use the pattern-transfer property of the non-degenerate stimulated parametric down-conversion in the low-gain regime to demonstrate an efficient scheme to cancel aberration.

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Choi, Kihong, Keehoon Hong, Han-Ju Yeom, and Joongki Park. "Color aberration corrected single-shot full-color incoherent holography." In Digital Holography and Three-Dimensional Imaging. OSA, 2020. http://dx.doi.org/10.1364/dh.2020.hf3d.6.

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Kruger, Philip B., Debra Stevens, and Steven Mathews. "Accommodation and chromatic aberration: effect of spatial frequency." In OSA Annual Meeting. Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.fk3.

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The longitudinal chromatic aberration of the eye produces color fringes at edges that can have a profound influence on accommodation. We used grating targets to study the influence of spatial frequency on sensitivity to these chromatic cues. A high speed infrared optometer was used to monitor accommodation while the subject viewed gratings in a Badal optometer. Dioptic vergence was modulated sinusoidally (1-3D) by moving a sine wave grating (1-10.5 c/d) toward and away from the subject's eye at 0.2 Hz. Three special lenses were used to modify the chromatic aberration of the eye; giving four stimulus conditions: (1) normal (usual chromatic aberration was present); (2) neutralized (no aberration was present); (3) doubled (aberration was twice as large as usual); and (4) reversed (aberration was opposite to normal). Gain and phase plots show that subjects are most sensitive to intermediate spatial frequencies (3-5 c/d), whether the effects of chromatic aberration are present or not. Furthermore, while subjects display broad individual differences in sensitivity to these cues, such sensitivity seems to be independent of spatial frequency.

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Reports on the topic "Colour aberration"

Two types of lenses for deep underwater photography. Woods Hole Oceanographic Institution, 2022. http://dx.doi.org/10.1575/1912/29564.

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In underwater photography, the object is immersed in water while the image is usually formed in air. The most obvious, straightforward way to form an image under these circumstances with a conventional type of lens is to use a plane parallel slab of glass as a window in front of the lens to separate the water from the air space. For most types of camera lenses, this is a perfectly adequate solution; But if one looks at the problem carefully, it is evident that such a system introduces a chromatic aberration referred to as lateral color. The source of this aberration is illustrated in Fig. 1. The dispersion at the glass to air interface overcompensates for the dispersion at the water to glass interface. As a result, the direction of a ray entering the camera lens for any given ray incident on the window varies with the wavelength of light.

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Academic literature on the topic 'Colour aberration'

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Reports on the topic "Colour aberration"