New methodology for the assessment of cleaning treatments. Applications of photogrammetry for restoration

López-Martínez, Teresa; García-Bueno, Ana; Medina-Florez, V. J.

doi:10.1016/j.culher.2017.09.019

Cited by 16 publications

(13 citation statements)

References 7 publications

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“…The aim of this study is to determine the effectiveness of a series of cleaning processes that allow the removal of whitewash layers from polychromed plasterwork. The effectivity of the cleaning methods over polychromic layers has been evaluated in other studies through different techniques like stereo microscopy, optical microscopy, scanning electron microscopy, photogrammetry, or colorimetric point measurements using a spectrophotometer [ 10 , 11 , 12 ]. While the colorimetric point-based measurements only offer information about the mean changes produced in a specific area of the sample, imaging techniques like the ones presented in this work provide more detailed information about the local changes produced in the surface.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Cleaning Processes Using Colorimetric and Spectral Data for the Removal of Layers of Limewash from Medieval Plasterwork

Martínez-Domingo

Castillo

García

et al. 2020

Sensors

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In the cultural heritage preservation of medieval buildings, it is common to find plaster walls covered in lime, which previously were painted in polychromy. The conservation interventions usually try to remove the whitewash, whilst maintaining the original color of the painted wall as much as possible. However, there is no agreement on which cleaning technique best preserves the original appearance of the colored plaster. Different pigments found below the lime layer may behave differently depending on the cleaning technique used. Usually, colorimetric or photometric area-based measurements are carried out to study the color of the cleaned areas to compare with their original color, obtained from pre-made plaster probes. However, this methodology fails when the mean color difference is not enough to fully characterize the changes in texture and color appearance. This study presents a set of experiments carried out using two different pigments (cinnabar and malachite) covered with lime, and treated with nine different cleaning techniques on plaster probes prepared according to medieval techniques. We have studied the effect of the cleaning process on the color and the homogeneity of the samples using a hyperspectral imaging workflow. Four different analysis methods are presented and discussed. Our results show that the proposed analysis is able to provide a much more comprehensive and diversified characterization of the quality of the cleaning method compared to the commonly used colorimetric or photometric area-based measurements.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Cleaning Processes Using Colorimetric and Spectral Data for the Removal of Layers of Limewash from Medieval Plasterwork

Martínez-Domingo

Castillo

García

et al. 2020

Sensors

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“…Con el objetivo de evaluar dichos tratamientos, se establece una metodología que permite delimitar la superficie a tratar mediante el empleo de un sistema de plantillas de acetato, de modo que se puedan analizar con precisión los cambios producidos en la superficie tratada. Para ello se ha empleado fotografía digital, microscopía estereoscópica, modelos fotogramétricos, elaborados con AutoDesk Recap y comparados con el programa CloudCompare (López Martínez et al 2018).…”

Section: Introductionunclassified

Estudio de métodos de limpieza sobre yeserías medievales

García¹,

Castillo

Bueno

2021

GEC

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El yeso ha sido empleado frecuentemente a lo largo de la historia en la elaboración de revestimientos arquitectónicos. Entre estos últimos destacan, por su belleza, las yeserías medievales. Este tipo de decoraciones suelen presentar importantes alteraciones respecto a su estado original, debido a la presencia de repolicromías y/o encalados. que ocultan la policromía original. Esta alteración puede acompañarse de pérdidas de policromía. En la actualidad, a esta problemática de conservación de las yeserías se une la escasez de estudios sobre tratamientos de limpieza específicos para estas obras con esta problemática de conservación. El trabajo que se presenta constituye una revisión de los métodos de limpieza a emplear en este tipo de obras, tanto (físicos cómo químicos). Se hace referencia al empleo de herramientas como el bisturí, o a la aplicación de empacos y geles elaborados a partir de polisacáridos complejos, ácidos acrílicos o éteres de celulosa y se describen las correspondientes pruebas de tratamientos realizadas sobre probetas. Los resultados obtenidos permiten establecer que el uso de geles, preparados a partir polisacáridos complejos y de éteres de celulosa, aplicados con disolventes como agua desionizada, acetona y alcohol, son eficaces para la limpieza de repolicromías realizadas al temple de cola animal sobre revestimientos de yeso.

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“…3D digitization is nowadays frequently used in a museum environment for research [1–4], conservation [5–8] or dissemination [9–12]. In recent years more and more initiatives have been started in order to investigate the possibility of using the combination of spectral and 3D imaging for cultural heritage.…”

Section: Introductionmentioning

confidence: 99%

Improving 3D photogrammetry models through spectral imaging: Tooth enamel as a case study

et al. 2019

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Reflective or translucent materials are a challenge to digitize in 3D. Results are better with a matt coating although objects from museum collections are often too fragile or too valuable to be treated in this way. It is therefore essential that alternative solutions are found. This study analyzed spectral photogrammetry as a possible solution. Spectral photogrammetry is an emerging technique which uses images at different wavelengths to create 3D models. Tooth enamel is a challenging material to digitize. Six sets of teeth were photographed at different wavelengths. The results showed that the quality of the models enamels parts improved when taken with ultraviolet wavelengths whilst models were less accurate when photogrammetry was performed with the red and infrared spectrum. This can be explained by the optical properties of enamel. This study demonstrates that knowing the optical properties of a material beforehand could help future photogrammetric digitization of challenging materials.

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New methodology for the assessment of cleaning treatments. Applications of photogrammetry for restoration

Cited by 16 publications

References 7 publications

Evaluation of Cleaning Processes Using Colorimetric and Spectral Data for the Removal of Layers of Limewash from Medieval Plasterwork

Evaluation of Cleaning Processes Using Colorimetric and Spectral Data for the Removal of Layers of Limewash from Medieval Plasterwork

Estudio de métodos de limpieza sobre yeserías medievales

Improving 3D photogrammetry models through spectral imaging: Tooth enamel as a case study

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