The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform
Jens Stoye - One of the best experts on this subject based on the ideXlab platform.
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Chroma Signal based retention time alignment for Chromatography mass spectrometry data
Bioinformatics, 2009Co-Authors: Nils Hoffmann, Jens StoyeAbstract:Summary: We describe Chroma, a web-based alignment tool for Chromatography–mass spectrometry data from the metabolomics and proteomics domains. Users can supply their data in open and standardized file formats for retention time alignment using dynamic time warping with different configurable local distance and similarity functions. Additionally, user-defined anchors can be used to constrain and speedup the alignment. A neighborhood around each anchor can be added to increase the flexibility of the constrained alignment. Chroma offers different visualizations of the alignment for easier qualitative interpretation and comparison of the data. For the multiple alignment of more than two data files, the center-star approximation is applied to select a reference among input files to align to. Availability: Chroma is available at http://bibiserv.techfak.uni-bielefeld.de/Chroma. Executables and source code under the L-GPL v3 license are provided for download at the same location. Contact: ed.dlefeleib-inu.kafhcet@eyots Supplementary information: Supplementary data are available at Bioinformatics online.
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Chroma: Signal-based retention time alignment for Chromatography–mass spectrometry data
Bioinformatics (Oxford England), 2009Co-Authors: Nils Hoffmann, Jens StoyeAbstract:Summary: We describe Chroma, a web-based alignment tool for Chromatography–mass spectrometry data from the metabolomics and proteomics domains. Users can supply their data in open and standardized file formats for retention time alignment using dynamic time warping with different configurable local distance and similarity functions. Additionally, user-defined anchors can be used to constrain and speedup the alignment. A neighborhood around each anchor can be added to increase the flexibility of the constrained alignment. Chroma offers different visualizations of the alignment for easier qualitative interpretation and comparison of the data. For the multiple alignment of more than two data files, the center-star approximation is applied to select a reference among input files to align to. Availability: Chroma is available at http://bibiserv.techfak.uni-bielefeld.de/Chroma. Executables and source code under the L-GPL v3 license are provided for download at the same location. Contact: ed.dlefeleib-inu.kafhcet@eyots Supplementary information: Supplementary data are available at Bioinformatics online.
Nils Hoffmann - One of the best experts on this subject based on the ideXlab platform.
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Chroma Signal based retention time alignment for Chromatography mass spectrometry data
Bioinformatics, 2009Co-Authors: Nils Hoffmann, Jens StoyeAbstract:Summary: We describe Chroma, a web-based alignment tool for Chromatography–mass spectrometry data from the metabolomics and proteomics domains. Users can supply their data in open and standardized file formats for retention time alignment using dynamic time warping with different configurable local distance and similarity functions. Additionally, user-defined anchors can be used to constrain and speedup the alignment. A neighborhood around each anchor can be added to increase the flexibility of the constrained alignment. Chroma offers different visualizations of the alignment for easier qualitative interpretation and comparison of the data. For the multiple alignment of more than two data files, the center-star approximation is applied to select a reference among input files to align to. Availability: Chroma is available at http://bibiserv.techfak.uni-bielefeld.de/Chroma. Executables and source code under the L-GPL v3 license are provided for download at the same location. Contact: ed.dlefeleib-inu.kafhcet@eyots Supplementary information: Supplementary data are available at Bioinformatics online.
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Chroma: Signal-based retention time alignment for Chromatography–mass spectrometry data
Bioinformatics (Oxford England), 2009Co-Authors: Nils Hoffmann, Jens StoyeAbstract:Summary: We describe Chroma, a web-based alignment tool for Chromatography–mass spectrometry data from the metabolomics and proteomics domains. Users can supply their data in open and standardized file formats for retention time alignment using dynamic time warping with different configurable local distance and similarity functions. Additionally, user-defined anchors can be used to constrain and speedup the alignment. A neighborhood around each anchor can be added to increase the flexibility of the constrained alignment. Chroma offers different visualizations of the alignment for easier qualitative interpretation and comparison of the data. For the multiple alignment of more than two data files, the center-star approximation is applied to select a reference among input files to align to. Availability: Chroma is available at http://bibiserv.techfak.uni-bielefeld.de/Chroma. Executables and source code under the L-GPL v3 license are provided for download at the same location. Contact: ed.dlefeleib-inu.kafhcet@eyots Supplementary information: Supplementary data are available at Bioinformatics online.
Shelley A. Hinsley - One of the best experts on this subject based on the ideXlab platform.
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Carotenoid plumage hue and Chroma Signal different aspects of individual and habitat quality in tits
Ibis, 2007Co-Authors: Peter N. Ferns, Shelley A. HinsleyAbstract:We hypothesized that Blue Tits Cyanistes caeruleus and Great Tits Parus major from low quality habitat (small woods) would have less yellow ventral plumage than those from high quality habitat (large woods) because they moult faster and/or their diet contains fewer carotenoids. They moult faster because they moult later in the season and are subject to more rapidly shortening daylengths. We tested this using a database of the plumage coloration (Chroma, hue and lightness) of birds breeding in woods of different sizes, by manipulating the speed of moult in captive Blue Tits, and by counting the abundance and size of caterpillars (the major source of dietary carotenoids) in the diet of nestlings. In accordance with our hypothesis, juveniles of both species (which moult about three weeks later than adults) were about 8% less saturated in colour (lower Chroma) than adults, but there was no significant difference in Chroma between habitats. However, both species did differ significantly in hue between large and small woods. Blue Tits forced to moult faster in captivity, at a rate similar to that caused by a month's delay in the start of moult, had yellow flank feathers that were 32% less saturated in colour than those allowed to moult more slowly. Blue Tit nestlings in large woods consumed 47% more caterpillar flesh (per gram of faecal material voided) than those in small woods, and Great Tit pulli 81% more. When habitat effects were controlled for in ANOVAs, Blue Tits mated assortatively on the basis of flank hue and Great Tits on the basis of flank lightness. Flank colour therefore has the capacity to provide information about the potential quality of both habitats, and individual birds, to potential colonists and sexual partners.
Peter N. Ferns - One of the best experts on this subject based on the ideXlab platform.
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Carotenoid plumage hue and Chroma Signal different aspects of individual and habitat quality in tits
Ibis, 2007Co-Authors: Peter N. Ferns, Shelley A. HinsleyAbstract:We hypothesized that Blue Tits Cyanistes caeruleus and Great Tits Parus major from low quality habitat (small woods) would have less yellow ventral plumage than those from high quality habitat (large woods) because they moult faster and/or their diet contains fewer carotenoids. They moult faster because they moult later in the season and are subject to more rapidly shortening daylengths. We tested this using a database of the plumage coloration (Chroma, hue and lightness) of birds breeding in woods of different sizes, by manipulating the speed of moult in captive Blue Tits, and by counting the abundance and size of caterpillars (the major source of dietary carotenoids) in the diet of nestlings. In accordance with our hypothesis, juveniles of both species (which moult about three weeks later than adults) were about 8% less saturated in colour (lower Chroma) than adults, but there was no significant difference in Chroma between habitats. However, both species did differ significantly in hue between large and small woods. Blue Tits forced to moult faster in captivity, at a rate similar to that caused by a month's delay in the start of moult, had yellow flank feathers that were 32% less saturated in colour than those allowed to moult more slowly. Blue Tit nestlings in large woods consumed 47% more caterpillar flesh (per gram of faecal material voided) than those in small woods, and Great Tit pulli 81% more. When habitat effects were controlled for in ANOVAs, Blue Tits mated assortatively on the basis of flank hue and Great Tits on the basis of flank lightness. Flank colour therefore has the capacity to provide information about the potential quality of both habitats, and individual birds, to potential colonists and sexual partners.
Moon Gi Kang - One of the best experts on this subject based on the ideXlab platform.
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Correction of Axial and Lateral Chromatic Aberration With False Color Filtering
IEEE Transactions on Image Processing, 2013Co-Authors: Joonyoung Chang, Hee Kang, Moon Gi KangAbstract:In this paper, we propose a Chromatic aberration (CA) correction algorithm based on a false color filtering technique. In general, CA produces color distortions called color fringes near the contrasting edges of captured images, and these distortions cause false color artifacts. In the proposed method, a false color filtering technique is used to filter out the false color components from the Chroma-Signals of the input image. The filtering process is performed with the adaptive weights obtained from both the gradient and color differences, and the weights are designed to reduce the various types of color fringes regardless of the colors of the artifacts. Moreover, as preprocessors of the filtering process, a transient improvement (TI) technique is applied to enhance the slow transitions of the red and blue channels that are blurred by the CA. The TI process improves the filtering performance by narrowing the false color regions before the filtering process when severe color fringes (typically purple fringes) occur widely. Last, the CA-corrected Chroma-Signal is combined with the TI Chroma-Signal to avoid incorrect color adjustment. The experimental results show that the proposed method substantially reduces the CA artifacts and provides natural-looking replacement colors, while it avoids incorrect color adjustment.