PROJECT INDIGO – DOCUMENT, DISSEMINATE &amp; ANALYSE A GRAFFITI-SCAPE

Verhoeven, Geert; Wild, Benjamin; Schlegel, Jona; Wieser, Martin; Pfeifer, Norbert; Wogrin, S.; Eysn, L.; Massimiliano, Carloni,; Bernhard, Koschiček-Krombholz,; Molada-Tebar, Adolfo; Otepka-Schremmer, J.; Ressl, Camillo; Trognitz, Martina; Alexander, Watzinger,

doi:10.5194/isprs-archives-xlvi-2-w1-2022-513-2022

Cited by 6 publications

(12 citation statements)

References 10 publications

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“…Two different digital cameras were used for this study: a Nikon D5600 (Nikon Corporation, Spain, Valencia) and a Nikon Z 7II (Nikon Corporation, Austria, Vienna), the latter being one of the official INDIGO cameras [ 24 ]. The exposure time, ISO, and aperture were controlled for all the photos to ensure proper exposure.…”

Section: Methodsmentioning

confidence: 99%

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Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation

Molada-Tebar,

Verhoeven,

Hernández-López

et al. 2024

Sensors

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Color data are often required for cultural heritage documentation. These data are typically acquired via standard digital cameras since they facilitate a quick and cost-effective way to extract RGB values from photos. However, cameras’ absolute sensor responses are device-dependent and thus not colorimetric. One way to still achieve relatively accurate color data is via camera characterization, a procedure which computes a bespoke RGB-to-XYZ matrix to transform camera-dependent RGB values into the device-independent CIE XYZ color space. This article applies and assesses camera characterization techniques in heritage documentation, particularly graffiti photographed in the academic project INDIGO. To this end, this paper presents COOLPI (COlor Operations Library for Processing Images), a novel Python-based toolbox for colorimetric and spectral work, including white-point-preserving camera characterization from photos captured under diverse, real-world lighting conditions. The results highlight the colorimetric accuracy achievable through COOLPI’s color-processing pipelines, affirming their suitability for heritage documentation.

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Section: Methodsmentioning

confidence: 99%

“…Project INDIGO wanted to push the status quo boundaries in inventorying and understanding extensive graffiti-scapes. This was mainly achieved by acquiring photos of new graffiti via weekly photographic tours, leading to a massive volume of digital photos obtained in widely varying illumination conditions [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation

Molada-Tebar,

Verhoeven,

Hernández-López

et al. 2024

Sensors

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“…Although there are certainly instances where graffiti crosses the line into vandalism, it is important to recognize that graffiti also has a rich artistic and cultural value. Contemporary graffiti artists often incorporate a variety of techniques and materials, such as spray paint, stencils, stickers, and wheat-pasting, to create their artworks (Verhoeven et al, 2022). These artworks are often characterized by their vibrant colors, intricate designs, and powerful messages (Feitosa-Santana et al, 2020).…”

Section: Studies Of Graffiti From a Global And Local Perspectivementioning

confidence: 99%

Evoking Nostalgia: Graffiti as Medium in Urban Space

Li,

Liu

2023

Sage Open

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This study examines the role of graffiti as a medium in urban spaces, particularly in the context of Macau. Graffiti, seen as a form of artistic expression, has the potential to invigorate and enliven public spaces. Utilizing visual ethnography methods and analyzing cultural policies, the paper aims to examine the presence of graffiti in various neighborhoods within Macau. The concept of nostalgia also serves as a theoretical framework to understand how graffiti can evoke memories and create an emotional connection to the past. By investigating hotspots like Largo do Estaleiro, Rua de S. Tiago da Barra, and the vicinity surrounding Ruins of St. Paul’s through interviews with residents and an examination of distribution patterns, we aim to comprehend how these graffiti sites can establish a link to history and contribute to a shared memory and sense of locality. The findings of this research have important implications for urban planning and cultural policy in Macau, as they highlight the significance of incorporating graffiti as a legitimate form of public art that can contribute to the cultural identity and sense of nostalgia in urban spaces.

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“…Non-contact technologies, on the other hand, allow for accurate 3D reconstruction without the associated drawbacks. Most researchers have focused on passive image-based approaches due to their low cost, portability and flexibility over a wide range of application fields, including industrial inspection and quality control [2][3][4][5] as well as heritage 3D documentation [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Remote Sens. 2023, 15, x FOR PEER REVIEW 2 of 22 flexibility over a wide range of application fields, including industrial inspection and quality control [2][3][4][5] as well as heritage 3D documentation [6][7][8][9]. Among image-based 3D reconstruction approaches, photogrammetry is a widely recognized method that can create a dense and geometrically accurate 3D point cloud of a real-world scene from a set of images taken from different perspectives.…”

Section: Introductionmentioning

confidence: 99%

A Critical Analysis of NeRF-Based 3D Reconstruction

et al. 2023

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This paper presents a critical analysis of image-based 3D reconstruction using neural radiance fields (NeRFs), with a focus on quantitative comparisons with respect to traditional photogrammetry. The aim is, therefore, to objectively evaluate the strengths and weaknesses of NeRFs and provide insights into their applicability to different real-life scenarios, from small objects to heritage and industrial scenes. After a comprehensive overview of photogrammetry and NeRF methods, highlighting their respective advantages and disadvantages, various NeRF methods are compared using diverse objects with varying sizes and surface characteristics, including texture-less, metallic, translucent, and transparent surfaces. We evaluated the quality of the resulting 3D reconstructions using multiple criteria, such as noise level, geometric accuracy, and the number of required images (i.e., image baselines). The results show that NeRFs exhibit superior performance over photogrammetry in terms of non-collaborative objects with texture-less, reflective, and refractive surfaces. Conversely, photogrammetry outperforms NeRFs in cases where the object’s surface possesses cooperative texture. Such complementarity should be further exploited in future works.

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PROJECT INDIGO – DOCUMENT, DISSEMINATE & ANALYSE A GRAFFITI-SCAPE

Cited by 6 publications

References 10 publications

Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation

Practical RGB-to-XYZ Color Transformation Matrix Estimation under Different Lighting Conditions for Graffiti Documentation

Evoking Nostalgia: Graffiti as Medium in Urban Space

A Critical Analysis of NeRF-Based 3D Reconstruction

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