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10 results for “colour measurement”
Ostwald_colour-atlas_reflectance-measurements
<p>This repository contains the results of visible reflectance spectroscopy that have been performed on three colour atlases in the 1920s made by Verlag Unesma under the supervision of Wilhelm Ostwald. These colour atlases are currently held at the Rijksmuseum Research Library in Amsterdam under the following inventory numbers (339D32 / 339D33 and GF386G3). </p><p>The atlases are physical representations of the colour space developed by Wilhelm Ostwald in the 1910s. They are composed of hundreds of small swatches of paint, where each one represents a specific colour and can be characterised by a hue number (ranging from F01 to F24) and a two-letter code that indicates the position of the swatch in the Ostwald colour space. </p><p>In addition to photographs stored in the zip file, each colour swatch were measured three times with a spectrophotometer from Konica Minolta (CM-2600d), where the UV radiation had been cut-off. Subsequently, the mean and standard deviation were calculated and stored inside the Ostwald_DB.csv file. The Lab values were calculated with the help of the Colour Science python package (https://www.colour-science.org/) according to a 10° observer and a D65 illuminant.</p><p>A Jupyter notebook along with a python script have been created to help users to manipulate the data contains in the Ostwald_DB.csv file.</p>
A Cosmetic Study to Measure the Change in Tooth Colour After Using Instant Whitening Prototypes Compared to a Negative Control
ClinicalTrials.gov study NCT06800443. IPD Sharing: NO. Countries: 1. Publications: 1.
Chewing Efficiency Measured by a Two Colour Chewing Gum Test in Amyotrophic Lateral Sclerosis (ALS) Patients?
ClinicalTrials.gov study NCT01772888. IPD Sharing: Not stated. Countries: 1. Publications: 2.
Data from: Image Calibration and Analysis Toolbox – a free software suite for measuring reflectance, colour, and pattern objectively and to animal vision
1. Quantitative measurements of colour, pattern, and morphology are vital to a growing range of disciplines. Digital cameras are readily available and already widely used for making these measurements, having numerous advantages over other techniques, such as spectrometry. However, off-the-shelf consumer cameras are designed to produce images for human viewing, meaning that their uncalibrated photographs cannot be used for making reliable, quantitative measurements. Many studies still fail to appreciate this, and of those scientists who are aware of such issues, many are hindered by a lack usable tools for making objective measurements from photographs. 2. We have developed an image processing toolbox that generates images that are linear with respect to radiance from the RAW files of numerous camera brands, and can combine image channels from multispectral cameras, including additional ultraviolet photographs. Images are then normalised using one or more grey standards to control for lighting conditions. This enables objective measures of reflectance and colour using a wide range of consumer cameras. Furthermore, if the camera's spectral sensitivities are known, the software can convert images to correspond to the visual system (cone-catch values) of a wide range of animals, enabling human and non-human visual systems to be modelled. The toolbox also provides image analysis tools that can extract luminance (lightness), colour, and pattern information. Furthermore, all processing is performed on 32-bit floating point images rather than commonly used 8-bit images. This increases precision and reduces the likelihood of data loss through rounding error or saturation of pixels, while also facilitating the measurement of objects with shiny or fluorescent properties. 3. All cameras tested using this software were found to demonstrate a linear response within each image and across a range of exposure times. Cone-catch mapping functions were highly robust, converting images to several animal visual systems and yielding data that agreed closely with spectrometer-based estimates. 4. Our imaging toolbox is freely available as an addition to the open source ImageJ software. We believe that it will considerably enhance the appropriate use of digital cameras across multiple areas of biology, in particular researchers aiming to quantify animal and plant visual signals.
Data from: Colour patch size and measurement error using reflectance spectrometry
1. Over the past twenty years, portable and relatively affordable spectrophotometers have greatly advanced the study of animal coloration. However, the small size of many colour patches poses methodological challenges that have not, to date, been assessed in the literature. Here, we tackle this issue for a reflectance spectrophotometry set-up widely used in ecology and evolution (the beam method). 2. We reviewed the literature on animal coloration reporting the use of reflectance spectrophotometry to explore how the minimum measurable size of a colour patch is determined. We then used coloured plastic sheets to create artificial colour patches, and quantify the relationship between colour patch size and distortions induced by resulting chimeric spectra (spectra contaminated by an adjacent colour patch). Finally, we assessed the generality of our findings using natural colour spots in the lizard Podarcis muralis, as a biologically realistic model. 3. We found a lack of consensus in the literature, frequently resulting in the rejection of valid data or the potential inclusion of unreliable data. As expected, we show that decreasing colour patch size reduces the reliability of reflectance measurements, but also that spectral distortions resulting from chimeric spectra depend on patch/background colour combinations. We found similar results using natural colour spots in P. muralis. 4. We propose a series of steps to avoid the pitfalls described above. First, we provide guidelines on how to identify chimeric spectra and estimate the minimum size of a measurable colour patch in order to avoid them. Second, we show that reducing the probe-to-surface distance allows for more accurate measurements and therefore improves the spectrophotometric assessment of small colour patches. Third, we suggest that, as a general rule of thumb, very small (< 2 mm) colour patches should be avoided when using traditional spectrophotometry methods.
Data from: Image Calibration and Analysis Toolbox – a free software suite for measuring reflectance, colour, and pattern objectively and to animal vision
Open the record for dataset details and reuse information.
Data from: Colour patch size and measurement error using reflectance spectrometry
Open the record for dataset details and reuse information.
Reliability of Transcutaneous Bilirubin Measurement According to the Skin Colour of Newborns
ClinicalTrials.gov study NCT07315126. IPD Sharing: NO. Countries: 1. Publications: 0.
Colour Coded Duplex Ultrasound of Native Arterio-venous Fistula for Haemodialysis With Venous Pressure Measurement Using Controlled Compression Ultrasound as a Predictor for Shunt Maturation in the Ea
ClinicalTrials.gov study NCT01001000. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Fiducial Reference Measurements for Satellite Ocean Colour Phase 2
FRM4SOC2 is a funded by the European Commission as part of the Copernicus Programme and implemented by EUMETSAT to promote the adoption of FRM principles across the OC community towards enhancing satellite product validation and algorithm development.
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.