Sökning: "spectral imaging"

Visar resultat 21 - 25 av 127 avhandlingar innehållade orden spectral imaging.

  1. 21. Applications of laser spectroscopy to analytical chemistry, environmental monitoring and medicine

    Författare :Thomas Johansson; Förbränningsmotorer; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fluorescence; spectroscopic techniques; fluorescence imaging; capillary electrophoresis; acoustic levitation; remote sensing; interstitial photodynamic therapy; multivariate analysis; Laserteknik; Laser technology; tissue optics; medical imaging; Fysicumarkivet A:2002:Johansson;

    Sammanfattning : In this thesis spectroscopic techniques have been used in the fields of analytical chemistry, environmental and medical applications. In analytical chemistry, laser induced fluorescence was used to image the separation of substances during capillary electrophoresis. LÄS MER

  3. 22. High Resolution Analysis of Halftone Prints : A Colorimetric and Multispectral Study

    Författare :Daniel Nyström; Björn Kruse; Markku Hauta- Kasari; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Color imaging; Multispectral imaging; Halftone print; Dot gain; Image analysis; Bildanalys;

    Sammanfattning : To reproduce color images in print, the continuous tone image is first transformed into a binary halftone image, producing various colors by discrete dots with varying area coverage. In halftone prints on paper, physical and optical dot gains generally occur, making the print look darker than expected, and making the modeling of halftone color reproduction a challenge. LÄS MER

  4. 23. Physical properties of chromospheric features : Plage, peacock jets, and calibrating it all

    Författare :Alexander G. M. Pietrow; Dan Kiselman; Jaime de la Cruz Rodríguez; Malcolm Druett; Gianna Cauzzi; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sun; chromosphere; plage; jets; imaging; spectropolarimetry; Astronomy; astronomi;

    Sammanfattning : The chromosphere is a complex and dynamic layer of the solar atmosphere, largely dominated by the local magnetic field configuration. It acts as an important interface between the photosphere below it and the hot corona above. However, studying this layer is not straightforward, as it is largely transparent in optical wavelengths. LÄS MER

  5. 24. In Vivo Diffuse Reflectance Spectroscopy of Human Tissue : From Point Measurements to Imaging

    Författare :Erik Häggblad; Göran Salerud; Tomas Strömberg; Maurice C. G. Maurice C. G. Aalders; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Medical engineering; Medicinsk teknik;

    Sammanfattning : This thesis presents the non-invasive use of diffuse reflectance spectroscopy (DRS) to provide information about the biochemical composition of living tissue. During DRS measurements, the incident, visible light is partially absorbed by chromophores but also scattered in the tissue before being remitted. LÄS MER

  7. 25. Frequency Recognition Algorithm for Multiple Exposures : Snapshot imaging using coded light

    Författare :Karolina Dorozynska; Förbränningsfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Snapshot imaging; structured illumination; structured light; multispectral; fluorescence; frequency encoding; image multiplexing; lock-in detection; Fysicumarkivet A:2020:Dorozynska;

    Sammanfattning : The central challenge tackled in this thesis is the development of an optical imaging approach capable of multidimensional image capture of dynamic samples. Many conventional optical imaging approaches, which can obtain dimensional information such as spectral, polarisation, or volumetric, to name a few, about samples either employ sequential image capture or parallelised detector arrangements. LÄS MER