Low-cost mobile system for multispectral cultural heritage data acquisition

Blažek, J.; Soukup, Jindřich; Zitová, Barbara; Flusser, Jan; Tichý, Tomáš; Hradilová, Janka

doi:10.1109/digitalheritage.2013.6743715

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…More detailed information can be found at [14]. The transmission of used filters and spectral characteristics of LED diodes can be found at [9], [15]. In spite of known characteristics data cannot be compared with the …”

Section: Camera Photometrymentioning

confidence: 99%

M3art: A Database of Models of Canvas Paintings

Blažek¹,

Soukup²,

Zitová³

et al. 2014

Lecture Notes in Computer Science

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Abstract. M3art database contains data about colours behaviour in VIS and NIR spectral bands. The database is open, publicly available and should serve as the knowledge base for further study of optical properties of pigments, drawing materials and canvases. The content of database consists of FORS and digital camera data collected in range 400-1050nm. Measurements were made on up to three layer samples composed of canvas, underdrawing and colour layers. The colorants were selected to represent historical painting techniques in Gothic and Renaissance According to underdrawing acquisition ability four material categories were established.

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Section: Camera Photometrymentioning

confidence: 99%

M3art: A Database of Models of Canvas Paintings

Blažek¹,

Soukup²,

Zitová³

et al. 2014

Lecture Notes in Computer Science

Self Cite

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“…The recent introduction of consumer-grade digital cameras modified for full-spectrum or single wavelength acquisition to heritage science has provided a less expensive, higher-resolution alternative [29,30]. This solution has spectral imaging capabilities while retaining user-friendly features and interfaces to a wide range of photographic accessories and image processing software.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Image-Based Multiscale Heritage Recording with Near-Infrared Data

Adamopoulos

Rinaudo

2020

IJGI

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Passive sensors, operating in the visible (VIS) spectrum, have widely been used towards the trans-disciplinary documentation, understanding, and protection of tangible cultural heritage (CH). Although, many heritage science fields benefit significantly from additional information that can be acquired in the near-infrared (NIR) spectrum. NIR imagery, captured for heritage applications, has been mostly investigated with two-dimensional (2D) approaches or by 2D-to-three-dimensional (3D) integrations following complicated techniques, including expensive imaging sensors and setups. The availability of high-resolution digital modified cameras and software implementations of Structure-from-Motion (SfM) and Multiple-View-Stereo (MVS) algorithms, has made the production of models with spectral textures more feasible than ever. In this research, a short review of image-based 3D modeling with NIR data is attempted. The authors aim to investigate the use of near-infrared imagery from relatively low-cost modified sensors for heritage digitization, alongside the usefulness of spectral textures produced, oriented towards heritage science. Therefore, thorough experimentation and assessment with different software are conducted and presented, utilizing NIR imagery and SfM/MVS methods. Dense 3D point clouds and textured meshes have been produced and evaluated for their metric validity and radiometric quality, comparing to results produced from VIS imagery. The datasets employed come from heritage assets of different dimensions, from an archaeological site to a medium-sized artwork, to evaluate implementation on different levels of accuracy and specifications of texture resolution.

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“…These systems are called multispectral or hyperspectral imagers, the difference relies on the number of spectral images produced; less than a dozen for the first [1][2][3][4][5], and much more for the hyperspectral systems which can use tunable filters (liquid-crystal tunable filters (LCTF) [6], acousto-optical tunable filter (AOTF) [7] or grating spectrometers [8] to provide hundreds of spectral images. The possibility of using an RGB digital camera rather than a monochromatic one [9,10] was also tested. It is necessary to point out that multispectral imaging has been also referred to in the art conservation sector as the method consisting in acquiring a collection of broad spectral band images (multimodal images) realized with different sensors and lighting sources, such as ultraviolet fluorescence photos, infrared reflectograms and x-ray radiographs [11].…”

Section: Introductionmentioning

confidence: 99%

“…All those instruments as well as many others [3,[21][22] reconstruct the reflectance spectra by measuring the spectral reflectance directly on every filter point. Another method consists in a complex computational reconstruction of the reflectance spectra from few large bandpass and long pass filters [2, 9,10,23]. This approach was developed in order to minimize the radiation on the target since the acquisition is faster but it requires advanced computational skills.…”

Section: Introductionmentioning

confidence: 99%

Multispectral imaging system using 12 interference filters for mapping pigments

Cosentino¹

2015

Cons. Património

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Multispectral imaging systems are used in art examination in order to map pigments and binders as well as retouches. This work presents a simple system composed of a monochromatic CCD camera and a set of only 12 interference filters characterized by different bandwidths and spacing throughout the covered electromagnetic spectrum (400-805 nm). The reasoning supporting the selection of these specific filters is discussed, as well as the results obtained on a collection of 54 historical pigments and on a series of 18 th century frescoes in Sicily. Generally, the filters set for similar systems are chosen equally spaced across the recorded spectrum. For this study the centre wavelength and the bandwidth of these filters have been chosen accordingly to the spectral features of historical pigments. This system allows only for a qualitative reconstruction of pigments reflectance spectra. It must be considered a valuable tool for segmenting the images of polychrome artworks and to identify areas of interest for further analytical examinations if more conclusive results are necessary. ResumoOs sistemas multiespectrais de imagem são utilizados na análise de obras de arte para mapear e identificar pigmentos e aglutinantes, bem como reintegrações cromáticas. Este trabalho apresenta um sistema simples composto por uma câmara CCD monocromática e um conjunto de apenas 12 filtros de interferência caracterizados por diferente espaçamento e largura das bandas ao longo do espectro electromagnético (400-805 nm). É justificada a selecção destes filtros e são discutidos os resultados obtidos quer com um conjunto de 54 pigmentos históricos quer com algumas pinturas a fresco, do século XVIII, da Sicília. De uma forma geral, os filtros usados em sistemas semelhantes são espaçados ao longo do espectro, mas, neste estudo, o comprimento de onda central e a largura da banda dos filtros foram seleccionados de modo a melhorar a representação das características espectrais dos pigmentos históricos. Este sistema permite apenas a reconstituição qualitativa dos espectros de reflectância. Deve ser considerado um instrumento útil para a segmentação de imagens de obras de arte polícromas e identificação de áreas de interesse para exame analítico mais detalhado se forem necessários resultados mais conclusivos. Article / Artigo

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Low-cost mobile system for multispectral cultural heritage data acquisition

Cited by 7 publications

References 14 publications

M3art: A Database of Models of Canvas Paintings

M3art: A Database of Models of Canvas Paintings

Enhancing Image-Based Multiscale Heritage Recording with Near-Infrared Data

Multispectral imaging system using 12 interference filters for mapping pigments

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