Dr. Yu Li Profile

Dr. Yu Li

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Publications (7)

Proceedings Article | 10 August 2023 Presentation

VIS-NIR hyperspectral imaging as a valuable tool to monitor radiation damage on paintings

Amelia Suzuki, Yu Li, C.S. Cheung, Cristiano Riminesi, Haida Liang

Proceedings Volume PC12620, PC1262003 (2023) https://doi.org/10.1117/12.2674988

KEYWORDS: Raman spectroscopy, Laser radiation, Hyperspectral imaging, Pigments, Reflectivity, Laser induced damage, Visual inspection, Visible radiation, Spectroscopy, Semiconductors

Proceedings Article | 20 June 2021 Presentation

Multimodal remote sensing for the monitoring and identification of moisture and salts on heritage buildings

Sotiria Kogou, Yu Li, Sammy Cheung, Haida Liang, David Thickett, Florence Liggins, Luke Butler

Proceedings Volume 11784, 117840V (2021) https://doi.org/10.1117/12.2593919

KEYWORDS: Short wave infrared radiation, Buildings, Remote sensing, Spatial resolution, Raman spectroscopy, Laser sources, Imaging spectroscopy, Remote Raman spectroscopy, Continuous wave operation, Spectral resolution

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Proceedings Article | 20 June 2021 Presentation

Ground-based remote sensing depth-resolved multimodal material identification of wall paintings at 3-15 m

Yu Li, Amelia Suzuki, Chi Shing Cheung, Sotiria Kogou, Haida Liang

Proceedings Volume 11784, 117840U (2021) https://doi.org/10.1117/12.2593844

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Proceedings Article | 20 June 2021 Presentation

Machine learning analysis of complementary multimodal spectral imaging data from a large manuscript collection

Luke Butler, Sotiria Kogou, Alexander Hogg, Yu Li, Alessandra Vichi, Annabel Gallop, Haida Liang

Proceedings Volume 11784, 1178405 (2021) https://doi.org/10.1117/12.2593918

KEYWORDS: Imaging spectroscopy, Machine learning, Associative arrays, Visualization, Reflectivity, FT-IR spectroscopy, Spectroscopy, Luminescence, Hyperspectral imaging, Data analysis

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This study sets out to analyse the artistic materials used in the maritime Southeast Asian manuscript collection at the British Library. To gain a full understanding of how artistic practises may have developed over time and changed between regions, it is necessary to perform large scale scientific analysis. Visible/NIR spectral imaging is an efficient method of collecting spectral reflectance data which can be used to distinguish different materials. Recent advancements in automatic data collection have meant that the volume of data collected has greatly increased, making traditional approaches to data analysis impossible to perform in a timely manner. Machine learning provides a viable solution to this as it can be used to automatically cluster millions of spectra into smaller, more manageable numbers of distinct spectral groups. Self-organising Maps are used as the building blocks of an algorithm which can perform clustering of large collections of spectral imaging data. Spectral reflectance alone is often not enough to perform pigment identification, consequently other complementary techniques are required. Advances in spectral imaging mean that each of these complementary techniques has a corresponding imaging modality. The machine learning approach developed in this project can be adapted to allow for the clustering of multimodal spectral imaging data including VIS/NIR hyperspectral imaging, macro-X-Ray fluorescence mapping, macro-Raman mapping, and Fourier transform infrared mapping. For multimodal clustering, each modality can be clustered individually and then brought together to produce a single cluster map which is a more refined representation of the material distribution than that produced from any individual spectral imaging modality.   A visualisation tool has also been developed for the easy interpretation and interrogation of spectral imaging data cubes and cluster maps for entire collections. Both the visualisation tool and clustering method will be made accessible to the cultural heritage community through an online DIGILAB platform.

Proceedings Article | 20 June 2021 Presentation

Investigation of laser-induced damage to historical paint during Raman analysis

Maria Amelia Suzuki, Yu Li, Yuda Gu, Chi Shing Cheung, Cristiano Riminesi, Haida Liang

Proceedings Volume 11784, 117840N (2021) https://doi.org/10.1117/12.2593925

KEYWORDS: Raman spectroscopy, Laser induced damage, Continuous wave operation, Visible radiation, Near infrared, Lithium, Reflectance spectroscopy, Radiation thermography, Optical inspection, Molecular spectroscopy

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Proceedings Article | 22 July 2019 Presentation

Machine learning analysis of illuminated Southeast Asian manuscripts using complementary noninvasive imaging techniques (Conference Presentation)

Luke Butler, Sotiria Kogou, Yu Li, Chi Shing Cheung, Haida Liang, Annabel Gallop, Paul Garside, Christina Duffy

Proceedings Volume 11058, 110581M (2019) https://doi.org/10.1117/12.2527576

KEYWORDS: Machine learning, Imaging spectroscopy, Associative arrays, X-ray fluorescence spectroscopy, Raman spectroscopy

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Proceedings Article | 22 July 2019 Presentation

Long-range remote spectroscopy for wall paintings and architectural interiors (Conference Presentation)

Yu Li, Chi Shing Cheung, Sotiria Kogou, Alex Hogg, Florence Liggins, Luke Butler, Haida Liang

Proceedings Volume 11058, 110580U (2019) https://doi.org/10.1117/12.2527614

KEYWORDS: Spectroscopy, Raman spectroscopy, Laser induced fluorescence, Imaging spectroscopy, Laser induced breakdown spectroscopy, Reflectivity, Visible radiation, Near infrared, Molecular lasers, Molecular spectroscopy

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