Color Space Transformation-Based Algorithm for Evaluation of Thermochromic Behavior of Cholesteric Liquid Crystals Using Polarized Light Microscopy

We investigated how well a multilayer neural network could implement the mapping between two trichromatic color spaces, specifically from camera R,G,B to tristimulus X,Y,Z. For training the network, a set of 800,000 synthetic reflectance spectra was generated. For testing the network, a set of 8,714 real reflectance spectra was collated from instrumental measurements on textiles, paints and natural materials. Various network architectures were tested, with both linear and sigmoidal activations. Results show that over 85% of all test samples had color errors of less than 1.0 ΔE2000 units, much more accurate than could be achieved by regression.

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A Correspondence-Free Color Chart Design for Color Calibration

London Imaging Meeting ◽

10.2352/issn.2694-118x.2020.lim-01 ◽

2020 ◽

Vol 2020 (1) ◽

pp. 100-104

Author(s):

Hakki Can Karaimer ◽

Rang Nguyen

Keyword(s):

Color Space ◽

Fixed Number ◽

New Approach ◽

Color Chart ◽

Color Calibration ◽

Space Transformation ◽

Color Space Transformation ◽

Chart Design ◽

Calibration Approach

Colorimetric calibration computes the necessary color space transformation to map a camera's device-specific color space to a device-independent perceptual color space. Color calibration is most commonly performed by imaging a color rendition chart with a fixed number of color patches with known colorimetric values (e. g., CIE XYZ values). The color space transformation is estimated based on the correspondences between the camera's image and the chart's colors. We present a new approach to colorimetric calibration that does not require explicit color correspondences. Our approach computes a color space transformation by aligning the color distributions of the captured image to the known distribution of a calibration chart containing thousands of colors. We show that a histogram-based colorimetric calibration approach provides results that are onpar with the traditional patch-based method without the need to establish correspondences.

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Recrystallization kinetics of zinc by polarized light microscopy

10.31274/rtd-180815-4519 ◽

1968 ◽

Author(s):

Idelle Marietta Peterson

Keyword(s):

Light Microscopy ◽

Polarized Light ◽

Polarized Light Microscopy ◽

Recrystallization Kinetics ◽

Kinetics Of

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Polarized Light Microscopy Coupled with Electron Backscatter Diffraction for 3D Serial Sectioning of Large Volumes of Twinned Titanium

Microscopy and Microanalysis ◽

10.1017/s1431927621000702 ◽

2021 ◽

Vol 27 (S1) ◽

pp. 30-32

Author(s):

Rodney McCabe ◽

Danel Savage ◽

Renuka Gogusetti ◽

Abhishek Bhattacharyya ◽

David Alexander

Keyword(s):

Light Microscopy ◽

Electron Backscatter Diffraction ◽

Polarized Light ◽

Polarized Light Microscopy ◽

Serial Sectioning ◽

Electron Backscatter ◽

Backscatter Diffraction

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Ferroelastic domains and phase transitions in organic–inorganic hybrid perovskite CH3NH3PbBr3

Journal of Materials Chemistry C ◽

10.1039/d0tc05618a ◽

2021 ◽

Author(s):

Maryam Bari ◽

Alexei A. Bokov ◽

Zuo-Guang Ye

Keyword(s):

Phase Transitions ◽

Electric Field ◽

Light Microscopy ◽

Domain Structure ◽

Polarized Light ◽

External Stress ◽

Polarized Light Microscopy ◽

Inorganic Hybrid ◽

Hybrid Perovskite ◽

Ferroelastic Domains

Polarized light microscopy reveals twin domains and symmetry of the phases in CH3NH3PbBr3 crystal; domain structure remains unresponsive to electric field but changes under external stress, confirming ferroelasticity while ruling out ferroelectricity.

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Exploiting the Binocular Head in Polarized Light Microscopy

Microscopy Today ◽

10.1017/s155192950006555x ◽

1994 ◽

Vol 2 (4) ◽

pp. 16-16

Author(s):

Walter C. McCrone

Keyword(s):

Light Microscopy ◽

Polarized Light ◽

Polarized Light Microscopy ◽

The Other ◽

Monocular Viewing ◽

Area Of Interest

Having been brought up on monocular microscopes I find the omnipresent binocular systems a luxury. To support this viewpoint I'd like to suggest some benefits you may not have considered.Because I'm used to monocular viewing I sometimes use two different oculars, say 10X and 25X, in order to scan quickly to find an area of interest and then to examine the detail with higher magnification. Occasionally I use both oculars simultaneously and “concentrate” on either image to the exclusion of the other. A better way is to set the interocular distance at the extreme setting most different from your own interocular distance. By moving your head about a centimeter either way you can use either ocular.

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Structural Morphology of Rabbit Patella and Suprapatella Cartilage by Microscopic MRI and Polarized Light Microscopy

Cartilage ◽

10.1177/1947603521990882 ◽

2021 ◽

pp. 194760352199088

Author(s):

Hannah Mantebea ◽

Syeda Batool ◽

Mouhamad Hammami ◽

Yang Xia

Keyword(s):

Articular Cartilage ◽

Light Microscopy ◽

Design Method ◽

Strong Dependence ◽

Polarized Light ◽

Polarized Light Microscopy ◽

Structural Morphology ◽

Pixel Resolution ◽

Patellar Cartilage ◽

Quantitative Results

Objective In order to appreciate the roles articular cartilage of sesamoid bones and sesamoid fibrocartilage play in anatomy and pathology, the articular cartilage of the patella ( n = 4) and suprapatella ( n = 4) (a sesamoid fibrocartilage) of 12 to 14 weeks old New Zealand rabbits were studied qualitatively and quantitatively. Design/Method The intact knee joints and block specimens from the joints were imaged using microscopic magnetic resonance imaging (µMRI) at a 97.6-µm pixel resolution for the former and 19.5-µm resolution for the latter. Histological sections were made out of the µMRI-imaged specimens, which were imaged using polarized light microscopy (PLM) at 0.25-, 1-, and 4-µm pixel resolutions. Results The patella cartilage varied in thickness across the medial to lateral ends of the sesamoid bone with the central medial aspect slightly thicker than the lateral aspect. The suprapatella fibrocartilage decreased proximally away from the knee joint. Quantitative results of patellar cartilage showed strong dependence of fiber orientation with the tissue depth. Three histological zones can be clearly observed, which are similar to articular cartilage from other large animals. The sesamoid fibrocartilage has one thin surface layer (10 µm thick) of parallel-arranged structured fibers followed immediately by the majority of random fibers in bulk tissue. T2 relaxation time anisotropy was observed in the patellar cartilage but not in the bulk fibrocartilage. Conclusion Given the different functions of these 2 different types of cartilages in joint motion, these quantitative results will be beneficial to future studies of joint diseases using rabbits as the animal model.

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