scholarly journals Multi-spectral and Thermography Imaging Techniques for the Investigation of a 15th Century Wall Painting

2020 ◽  
Author(s):  
Marco Ricci ◽  
Stefano Laureti ◽  
Hamed Malekmohammadi ◽  
Stefano Sfarra ◽  
Marcello Melis ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Pulse Compression ◽  
Near Infrared ◽  
Multispectral Imaging ◽  
Imaging Techniques ◽  
Good Practice ◽  
Medical Diagnostics ◽  
Wall Painting ◽  
Imaging Method ◽  
15Th Century

Abstract When planning the restoration of an artwork, the good practice involves the evaluation of the item healthiness before starting the common operation of cleaning, consolidation, etc., possibly through non-invasive techniques that supply meaningful information about the whole item. Motivated by this need, a plethora of imaging techniques are used in cultural heritage diagnostic typically borrowed from other applications – e.g. medical diagnostics, nondestructive testing, etc., and then tailored for inspecting cultural heritage objects. In the inspection of a painting, hyper- and multi- spectral techniques are commonly used to analyze the outer layers (varnish, pictorial and drawing) while X-ray, tomography, and many other can be employed to investigate its inner structure. Although highly desirable, a single technique providing all the info about a painting is still not available, thus it is of great interest defining protocols that could optimally exploit the complementarities of a limited number of techniques. To this aim, the present paper shows the combined use of the Hypecolorimetric Multispectral Imaging (HMI) and that of the Pulse-Compression Thermography (PuCT) on a 15th century wall painting attributed to the Italian artist Antonio del Massaro, also known as Pastura, and representing the Madonna with the Child and the Saints Jerome and Francis. In particular, HMI is a multispectral imaging method working from the ultraviolet to the near infrared region, exploiting advanced processing based on artificial intelligence to define hypercolorimetric coordinates. Such approach guarantees a thorough analysis of the outer layers, underlining previous restorations, varnish alterations and allowing the pigments to be classified from a comparison with a large database. The PuCT method adopted here has been tailored for the specific needs of artworks’ inspection and it allows for a safe imaging of the multilayer structure of paintings, and hence the stratigraphy analysis, through a suitable processing of the time-domain thermal response. The capabilities and the complementarities of the two techniques, whose info can also be fused through postprocessing techniques, are illustrated in detail in this paper. A false-color imaging approach is also proposed to improve the readability and analysis of the thermography results.

scholarly journals Rapid Measurement of Soybean Seed Viability Using Kernel-Based Multispectral Image Analysis

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 271 ◽  
Author(s):  
Insuck Baek ◽  
Dewi Kusumaningrum ◽  
Lalit Kandpal ◽  
Santosh Lohumi ◽  
Changyeun Mo ◽  
...  
Keyword(s):  
Near Infrared ◽  
Multispectral Imaging ◽  
Seed Viability ◽  
Soybean Seed ◽  
Imaging Method ◽  
Soybean Seeds ◽  
Threshold Method ◽  
Nondestructive Technique ◽  
Imaging Model ◽  
Important Quality

Viability is an important quality factor influencing seed germination and crop yield. Current seed-viability testing methods rely on conventional manual inspections, which use destructive, labor-intensive and time-consuming measurements. The aim of this study is to distinguish between viable and nonviable soybean seeds, using a near-infrared (NIR) hyperspectral imaging (HSI) technique in a rapid and nondestructive manner. The data extracted from the NIR–HSI of viable and nonviable soybean seeds were analyzed using a partial least-squares discrimination analysis (PLS-DA) technique for classifying the viable and nonviable soybean seeds. Variable importance in projection (VIP) was used as a waveband selection method to develop a multispectral imaging model. Initially, the spectral profile of each pixel in the soybean seed images was subjected to PLS-DA analysis, which yielded a reasonable classification accuracy; however, the pixel-based classification method was not successful for high accuracy detection for nonviable seeds. Another viability detection method was then investigated: a kernel image threshold method with an optimum-detection-rate strategy. The kernel-based classification of seeds showed over 95% accuracy even when using only seven optimal wavebands selected through VIP. The results show that the proposed multispectral NIR imaging method is an effective and accurate nondestructive technique for the discrimination of soybean seed viability.

scholarly journals Use of Infrared Imaging in Contemporary Source Studies

2020 ◽  
Vol 19 (8) ◽  
pp. 117-127
Author(s):  
Angelina A. Kalashnikova
Keyword(s):  
Cultural Heritage ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Imaging Techniques ◽  
Infrared Analysis ◽  
Routine Practice ◽  
Source Studies ◽  
Ancient Manuscripts ◽  
Multispectral Analysis ◽  
Ir Reflectography

The paper gives a brief overview of infrared (IR) imaging techniques and the cases of their applying to the study of ancient manuscripts and objects of cultural heritage. The method of IR reflectography is used in fine art research, which allows the visualization of details hidden by the paint layers with the help of a scanner. There are also the cases, when IR reflectography is implemented into papyrology with the purpose to make ancient papyri, that turned dark-brown, more legible. Thermography is also used both in studies of cultural heritage and written documents, such as research of bookbinding and supports. Multispectral analysis is a well-proven method of text visualization and digital restoration of ancient manuscripts, which usually is applied in palimpsest decipher. Then the paper considers the method that includes part of IR spectrum is hyperspectral analysis. It is also used in papyrology. Finally, the author observed method of near-infrared imaging (NIRI) and its use for different purposes of the source studies. The paper concludes by arguing the relevance of near-infrared analysis of paper-based historical documents as a key-element of source study. NIRI allows researchers to obtain digital copies of watermarks and investigate corrections of the text made with different inks. The paper provides reader with the technical recommendations on basic NIRI equipment. To sum up, the author declares that there is a possibility for NIRI to become an everyday routine practice for researchers in near future due to its ability to provide a basic analysis of paper, watermarks and ink.

Non-Destructive Defect Detection of Apples by Spectroscopic and Imaging Technologies: A Review

2017 ◽  
Vol 60 (5) ◽  
pp. 1765-1790 ◽  
Author(s):  
Yuzhen Lu ◽  
Renfu Lu
Keyword(s):  
Near Infrared ◽  
Multispectral Imaging ◽  
Imaging Techniques ◽  
Mechanical Damage ◽  
Research Progress ◽  
Structured Illumination ◽  
Time Resolved ◽  
Wide Range ◽  
Detection Quality ◽  
Non Destructive

Abstract. Apples are susceptible to a wide range of defects that can occur in the orchard and during the post-harvest period. Detection of these defects by non-destructive sensing techniques is of great importance for the apple industry and has been an intensive research topic over the past two decades. This review presents an overview of common defects in apples, encompassing physiological disorders, mechanical damage, pathological disorders, and contamination. Presented and discussed in this review is research progress on the detection of defects in apples using various non-destructive spectroscopic and imaging techniques, including visible/near-infrared spectroscopy, fluorescence spectroscopy and imaging, monochromatic and color imaging, hyperspectral and multispectral imaging, x-ray imaging, magnetic resonance imaging, thermal imaging, time-resolved and spatially resolved spectroscopy, Raman spectroscopy, biospeckle imaging, and structured-illumination reflectance imaging. This review concludes with remarks on the prospects of these techniques and research needs in the future. Keywords: Apples, Defects, Imaging, Non-destructive detection, Quality, Safety, Spectroscopy.

scholarly journals The Voyatzis Mansion in Aegina, Greece: A Historical and Architectural Approach and Physicochemical Documentation of the Wall Painting Decoration

Heritage ◽  
2021 ◽  
Vol 4 (4) ◽  
pp. 3630-3651
Author(s):  
Athena Georgia Alexopoulou ◽  
Zoe Georgiadou ◽  
Panagiotis Ilias ◽  
Agathi Anthoula Kaminari
Keyword(s):  
Near Infrared ◽  
Imaging Techniques ◽  
Historical Context ◽  
Infrared Region ◽  
Physicochemical Analysis ◽  
Wall Painting ◽  
Architectural Form ◽  
Application Techniques ◽  
Discrete Structures ◽  
The Aesthetic

This paper refers to the study of the Voyatzis mansion, in the port of Aegina, Greece. The building complex consists of two discrete structures, which were built at different times (before 1830, 1880 and 1890) and have housed either the Voyatzis family home or its business and work premises. The present research is focused on the documentation of the building, which was never published, and combines the architectural form and elements within its historical context as well as the physicochemical analysis of the painted decoration. The key hypothesis investigated is whether Konstantinos Voyatzis transferred the aesthetic approach and application techniques from Symi to Aegina, when he emigrated from his birthplace. The documentation of the ceiling decoration as well as the physicochemical study of the second floor’s internal wall painting decoration in the main rooms was carried out using in situ modern hyperspectral imaging in specific wavelengths of the visible and near-infrared region, as well as in false color infrared mode. Complementary SWIR imaging, using an InGaAs sensor at the range 900–1700 nm was also applied. The assumption was supported by the findings of the imaging techniques, which showed, apart from the secco method, the use of traditional pigments for the wall paintings, such as cobalt blue, brown, red and yellow earth pigments, chrome oxide green and black, sometimes in admixture with white. The use of guidelines and stencil in the case of the hallway was also recorded.

Near-infrared spectroscopy (NIRS) – a promising brain imaging method in Psychiatry?

2008 ◽  
Vol 39 (01) ◽  
Author(s):  
AJ Fallgatter ◽  
AC Ehlis ◽  
MM Richter ◽  
M Schecklmann ◽  
MM Plichta
Keyword(s):  
Infrared Spectroscopy ◽  
Brain Imaging ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Imaging Method

Cardiovascular Imaging for Guiding Interventional Therapy in Structural Heart Diseases

2020 ◽  
Vol 16 (2) ◽  
pp. 111-122
Author(s):  
Nora Rat ◽  
Iolanda Muntean ◽  
Diana Opincariu ◽  
Liliana Gozar ◽  
Rodica Togănel ◽  
...  
Keyword(s):  
Heart Diseases ◽  
Interventional Procedure ◽  
Imaging Techniques ◽  
Ductus Arteriosus ◽  
Three Dimensional ◽  
High Specificity ◽  
Interventional Therapy ◽  
Structural Defects ◽  
Imaging Method ◽  
Three Dimensional Echocardiography

Development of interventional methods has revolutionized the treatment of structural cardiac diseases. Given the complexity of structural interventions and the anatomical variability of various structural defects, novel imaging techniques have been implemented in the current clinical practice for guiding the interventional procedure and for selection of the device to be used. Three– dimensional echocardiography is the most used imaging method that has improved the threedimensional assessment of cardiac structures, and it has considerably reduced the cost of complications derived from malalignment of interventional devices. Assessment of cardiac structures with the use of angiography holds the advantage of providing images in real time, but it does not allow an anatomical description. Transesophageal Echocardiography (TEE) and intracardiac ultrasonography play major roles in guiding Atrial Septal Defect (ASD) or Patent Foramen Ovale (PFO) closure and device follow-up, while TEE is the procedure of choice to assess the flow in the Left Atrial Appendage (LAA) and the embolic risk associated with a decreased flow. On the other hand, contrast CT and MRI have high specificity for providing a detailed description of structure, but cannot assess the flow through the shunt or the valvular mobility. This review aims to present the role of modern imaging techniques in pre-procedural assessment and intraprocedural guiding of structural percutaneous interventions performed to close an ASD, a PFO, an LAA or a patent ductus arteriosus.

scholarly journals Optimized Method for Mapping Inorganic Pigments by Means of Multispectral Imaging Combined with Hyperspectral Spectroscopy for the Study of Vincenzo Pasqualoni’s Wall Painting at the Basilica of S. Nicola in Carcere in Rome

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 839
Author(s):  
Lucilla Pronti ◽  
Giuseppe Capobianco ◽  
Margherita Vendittelli ◽  
Anna Candida Felici ◽  
Silvia Serranti ◽  
...  
Keyword(s):  
Multispectral Imaging ◽  
Imaging System ◽  
Principal Component ◽  
Reflectance Spectroscopy ◽  
Wall Painting ◽  
High Spectral Resolution ◽  
Spectral Difference ◽  
Color Palette ◽  
A Minor ◽  
Nir Reflectance Spectroscopy

Multispectral imaging is a preliminary screening technique for the study of paintings. Although it permits the identification of several mineral pigments by their spectral behavior, it is considered less performing concerning hyperspectral imaging, since a limited number of wavelengths are selected. In this work, we propose an optimized method to map the distribution of the mineral pigments used by Vincenzo Pasqualoni for his wall painting placed at the Basilica of S. Nicola in Carcere in Rome, combining UV/VIS/NIR reflectance spectroscopy and multispectral imaging. The first method (UV/VIS/NIR reflectance spectroscopy) allowed us to characterize pigment layers with a high spectral resolution; the second method (UV/VIS/NIR multispectral imaging) permitted the evaluation of the pigment distribution by utilizing a restricted number of wavelengths. Combining the results obtained from both devices was possible to obtain a distribution map of a pictorial layer with a high accuracy level of pigment recognition. The method involved the joint use of point-by-point hyperspectral spectroscopy and Principal Component Analysis (PCA) to identify the pigments in the color palette and evaluate the possibility to discriminate all the pigments recognized, using a minor number of wavelengths acquired through the multispectral imaging system. Finally, the distribution and the spectral difference of the different pigments recognized in the multispectral images, (in this case: red ochre, yellow ochre, orpiment, cobalt blue-based pigments, ultramarine and chrome green) were shown through PCA false-color images.

scholarly journals Coherence tomography with broad bandwidth extreme ultraviolet and soft X-ray radiation

2021 ◽  
Vol 127 (4) ◽  
Author(s):  
S. Skruszewicz ◽  
S. Fuchs ◽  
J. J. Abel ◽  
J. Nathanael ◽  
J. Reinhard ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Near Infrared ◽  
Extreme Ultraviolet ◽  
Infrared Light ◽  
Imaging Method ◽  
Optical Coherence ◽  
Axial Resolution ◽  
Cross Sectional ◽  
X Ray ◽  
Broad Bandwidth

AbstractWe present an overview of recent results on optical coherence tomography with the use of extreme ultraviolet and soft X-ray radiation (XCT). XCT is a cross-sectional imaging method that has emerged as a derivative of optical coherence tomography (OCT). In contrast to OCT, which typically uses near-infrared light, XCT utilizes broad bandwidth extreme ultraviolet (XUV) and soft X-ray (SXR) radiation (Fuchs et al in Sci Rep 6:20658, 2016). As in OCT, XCT’s axial resolution only scales with the coherence length of the light source. Thus, an axial resolution down to the nanometer range can be achieved. This is an improvement of up to three orders of magnitude in comparison to OCT. XCT measures the reflected spectrum in a common-path interferometric setup to retrieve the axial structure of nanometer-sized samples. The technique has been demonstrated with broad bandwidth XUV/SXR radiation from synchrotron facilities and recently with compact laboratory-based laser-driven sources. Axial resolutions down to 2.2 nm have been achieved experimentally. XCT has potential applications in three-dimensional imaging of silicon-based semiconductors, lithography masks, and layered structures like XUV mirrors and solar cells.

scholarly journals “‘But the Fountain Sprang Up and the Bird Sang Down’: Heidegger’s Gathering of the Fourfold and the Seven-Sacraments Font at Salle, Norfolk.”

Religions ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 464
Author(s):  
Marie Clausén
Keyword(s):  
Cultural Heritage ◽  
Art History ◽  
Architectural Elements ◽  
15Th Century ◽  
The Earth ◽  
Medieval Church ◽  
The Church ◽  
As If

My paper analyses the 15th-century seven-sacraments font at the medieval church of St Peter and St Paul at Salle in Norfolk (England). The church guides and gazetteers that describe the font, and the church in which it is situated, owe both their style and content to Art History, focusing as they do on their material and aesthetic dimensions. The guides also tend towards isolating the various elements of the font, and these in turn from the rest of the architectural elements, fittings and furniture of the church, as if they could be meaningfully experienced or interpreted as discrete entities, in isolation from one another. While none of the font descriptions can be faulted for being inaccurate, they can, as a result of these tendencies, be held insufficient, and not quite to the purpose. My analysis of the font, by means of Heidegger’s concept of Dwelling, does not separate the font either from the rest of the church, nor from other fonts, but acknowledges that it comes to be, and be seen as, what it is only when considered as standing in ‘myriad referential relations’ to other things, as well as to ourselves. This perspective has enabled me to draw out what it is about the font at Salle that can be experienced as not merely beautiful or interesting, but also as meaningful to those—believers and non-believers alike—who encounter it. By reconsidering the proper mode of perceiving and engaging with the font, we may spare it from being commodified, from becoming a unit in the standing reserve of cultural heritage, and in so doing, we, too, may be momentarily freed from our false identities as units of production and agents of consumption. The medieval fonts and churches of Norfolk are, I argue, not valuable as a result of their putative antiquarian qualities, but invaluable in their extending to us a possibility of dwelling—as mortals—on the earth—under the sky—before the divinities.

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