Visual enhancement of old documents with hyperspectral imaging

Kim, Seon Joo; Deng, Fanbo; Brown, Michael S.

doi:10.1016/j.patcog.2010.12.019

Cited by 94 publications

(26 citation statements)

References 32 publications

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“…It can be seen that the significant scratch and noise band removal by MNF transform had a significant effect on image enhancement. In addition, blind separation technologies, such as principal component analysis (PCA) and independent component analysis (ICA), also proved to improve the readability of degraded images and reveal hidden information [23]. In order to compare the image enhancement effects of the method in this paper with that of PCA and ICA, these methods were applied to the original hyperspectral image of area 1.…”

Section: Comparison With Other Methodsmentioning

confidence: 99%

“…These two studies proved that hyperspectral imaging technology is a feasible and viable approach in the study of cultural relics. In 2011, Kim et al [23] used hyperspectral imaging to assist in visual enhancement of old documents. Goltz et al [24] used principal component analysis to somewhat reduce the effects of iron and ink stains on old documents and enhance document readability.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of Hidden Information under Sootiness on Murals Based on Hyperspectral Image Enhancement

et al. 2019

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Changes in the environment and human activities can cause serious deterioration of murals. Hyperspectral imaging technology can observe murals in the range of visible to near infrared light, providing a scientific and non-destructive way for mural digital preservation. An effective method to extract hidden information from the sootiness of murals in order to enhance the visual value of patterns in ancient murals using hyperspectral imaging is proposed in this paper. Firstly, Minimum Noise Fraction transform was applied to reduce sootiness features in the background of the mural. Secondly, analysis of spectral characteristics and image subtraction were used to achieve feature enhancement of the murals. Finally, density slicing was performed to extract the patterns under the sootiness. The results showed that the extraction of hidden information was achieved with an overall accuracy of 88.97%.

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Section: Comparison With Other Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extraction of Hidden Information under Sootiness on Murals Based on Hyperspectral Image Enhancement

et al. 2019

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“…They are efficient methods for collecting millions of spectra since a spectrum is measured for each spatial pixel. It relies on the recording of sequential images at various spectral bands ranging from ultraviolet (UV)-visible to near-infrared (NIR) [22,23]. Multi-spectral imaging enables efficient capturing of spectral reflectance at millions of pixels simultaneously [24].…”

Section: Multi-spectral Imagingmentioning

confidence: 99%

Non-Linear Microscopy: A Well-Established Technique for Biological Applications towards Serving as a Diagnostic Tool for in situ Cultural Heritage Studies

Mari

Filippidis

2020

Sustainability

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A range of sophisticated imaging techniques have been developed in recent years that can reveal the surface structure of cultural heritage objects with varying precision. In combination with various spectroscopic methods, they allow the study of the chemical composition of the object; thus, conclusions can be drawn about the origin of the object or its initial components, method, or time of creation, authenticity, mechanisms of degradation, and ways of further conservation. At present, different techniques can be applied to a wide range of cultural heritage objects, such as varnishes, paintings, archaeological objects, binding media, paper-based documents, parchments, marbles, frescoes, as well as various objects made of leather, fabric, stone, ceramics and glass, wood, or metal. One of the main needs in the study of cultural heritage (CH) is the transportability/portability of the research equipment, since many pieces under investigation cannot be moved to the laboratory, either because of their size, inseparability (for example, frescoes on walls, mural paintings in caves), or the threat of damage. In this work, we briefly overview the main optical- and laser-based methods used for the study of cultural heritage objects indicating the scope of their application, and we focus on the applications of non-linear microscopic methods for the investigation of a series of artifacts. We also discuss all the requirements for the construction of a prototype transportable non-linear optical system that will be used as a novel diagnostic tool for in situ studies of CH assets. The availability of such a transportable workstation will significantly improve the study and characterization of various types of CH objects and will constitute an extremely useful diagnostic tool for heritage scientists dealing with a variety of investigations.

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“…Reflectance imaging spectroscopy is used within art examinations to visually enhance old documents (Kim et al 2011;Lettner et al 2008;Padoan et al 2008); to map and identify pigments (Delaney et al 2014;Melessanaki et al 2001;Ricciardi et al 2009), as well as binders such as animal glue and egg tempera (Dooley et al 2013); and to detect damage and areas of retouching (Pelagotti et al 2008a). When pigments are mixed or glazed, reflectance spectroscopy does not always provide conclusive identification unless the pigments used have very clear and unique spectral features.…”

Section: Introductionmentioning

confidence: 99%

Panoramic, Macro and Micro Multispectral Imaging: An Affordable System for Mapping Pigments on Artworks

Cosentino¹

2015

Journal of Conservation and Museum Studies

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Multispectral imaging systems are used in art examinations to map and identify pigments, binders and areas of retouching. A monochromatic camera is combined with an appropriate wavelength selection system and acquires a variable number of spectral images of a scene. These images are then stacked into a reflectance imaging cube to reconstruct reflectance spectra from each of the images' pixels. This paper presents an affordable multispectral imaging system composed of a monochromatic CCD camera and a set of only 12 interference filters for mapping pigments on works of art and for the tentative identification of such pigments. This work demonstrates the versatility of this set-up, a versatility enabling it to be applied to different tasks, involving examination and documentation of objects of varying size. Use of this multispectral camera for both panoramic and macro photography is discussed, together with the possibilities facilitated from the coupling of the system to a stereomicroscope and a compound microscope. This system is of particular interest for the cultural heritage sector because of its hardware simplicity and acquisition speed, as well as its lightness and small dimensions.

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Visual enhancement of old documents with hyperspectral imaging

Cited by 94 publications

References 32 publications

Extraction of Hidden Information under Sootiness on Murals Based on Hyperspectral Image Enhancement

Extraction of Hidden Information under Sootiness on Murals Based on Hyperspectral Image Enhancement

Non-Linear Microscopy: A Well-Established Technique for Biological Applications towards Serving as a Diagnostic Tool for in situ Cultural Heritage Studies

Panoramic, Macro and Micro Multispectral Imaging: An Affordable System for Mapping Pigments on Artworks

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