Digital Imaging for Cultural Heritage Preservation

Processing Sampled 3D Data: Reconstruction and Visualization Technologies (Digital Imaging) Part 3

Mapping Complex Photographic Detail on 3D Models Another issue concerning the high-quality mapping of color information over a 3D model is how to manage the very high resolution and redundant color sampling. Just using plain standard or consumer digital cameras one can easily obtain a very high resolution color sampling. Currently, the resolution of consumer […]

Processing Sampled 3D Data: Reconstruction and Visualization Technologies (Digital Imaging) Part 4

Efficient Visualization and Management of Sampled 3D Data Some issues arise from the very dense sampling resolution granted by modern scanning devices. Being able to sample in the order of ten points per squared millimeter or more (in the case of triangulation-based systems) is of paramount value in many applications which need a very accurate […]

ARC3D: A Public Web Service That Turns Photos into 3D Models (Digital Imaging) Part 1

Introduction Increasingly, cultural heritage professionals make use of 3D capture technologies, both for study and for documentation. There is a wide range of such technologies to choose from. One problem is that there does not seem to be a single one that is optimal for all objects or scenes. Thus, also taking into account cost […]

ARC3D: A Public Web Service That Turns Photos into 3D Models (Digital Imaging) Part 2

Automatic Reconstruction Pipeline After uploading the images to the ARC3D server, no further user interaction is needed, but also not possible. Hence, important prerequisites are high fidelity and robustness on the server part. In order to avoid frustration and multiple uploads at the client side, the server should maximize the chance of obtaining a good […]

ARC3D: A Public Web Service That Turns Photos into 3D Models (Digital Imaging) Part 3

Result After submitting the sequences to ARC3D and obtaining the results, the resulting depth maps were imported into MeshLab for post processing. The Poisson Reconstruction [9] tool was used to remove noise and to close holes. ARC3D reconstructs all meshes in their own reference frame, since no information about global position and orientation (aka geo-reference) […]

Accurate and Detailed Image-Based 3D Documentation of Large Sites and Complex Objects (Digital Imaging) Part 1

Introduction The environment and its heritage sites or objects suffer from wars, natural disasters, weather changes, and human negligence. According to UNESCO [1], “a heritage can be seen as an arch between what we inherit and what we leave behind … Heritage is our legacy from the past, what we live with today and what […]

Accurate and Detailed Image-Based 3D Documentation of Large Sites and Complex Objects (Digital Imaging) Part 2

Image Data Acquisition Nowadays a large amount of image products is available in terms of geometrical resolution (footprint or Ground Sample Distance), spectral resolution (number of spectral channels), and costs. Used for mapping, documentation and visualization purposes, the available images can be acquired from a wide variety of acquisition tools: middle- and high-resolution satellite sensors […]

Accurate and Detailed Image-Based 3D Documentation of Large Sites and Complex Objects (Digital Imaging) Part 3

3D Measurements Once the calibration parameters are known and the images are oriented, the scene measurements can be performed with manual, semi-automated, or automated “matching” procedures. The measured 2D image primitives and correspondences (points or edges) are converted into unique 3D object coordinates (3D point cloud) using the collinearity principle and the known exterior and […]

Digitizing the Parthenon: Estimating Surface Reflectance under Measured Natural Illumination (Digital Imaging) Part 1

Introduction Digitizing objects and environments from the real world has become an important part of creating realistic computer graphics. Capturing geometric models has become a common process through the use of structured lighting, laser triangulation, and laser time-of-flight measurements. Recent projects such as [1-3] have shown that accurate and detailed geometric models can be acquired […]

Digitizing the Parthenon: Estimating Surface Reflectance under Measured Natural Illumination (Digital Imaging) Part 2

Natural Illumination Capture Each time a photograph of the site was taken, we used a device to record the corresponding incident illumination within the environment. The lighting capture device was a digital camera aimed at three spheres: one mirrored, one shiny black, and one diffuse gray. We placed the device in a nearby accessible location […]

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