Information Technology Reference
In-Depth Information
at age 30, these papier mache sculptures were brightly-painted with intricate patterns
and frequently featured wings, horns, tails, fierce teeth, and bulgy eyes.
Manuel Jiménez, recognized as the founder of folk art woodcarving in Oaxaca,
started in the 1960s to woodcarve alebrijes. Nowadays (2009) there are over 200
woodcarving families concentrated in the villages San Antonio Arrazola, San
Martin Tilcajete, La Union Tejalapa, and San Pedro Cajonos.
21.1.2.5.3 Process Flow
•
Laser points acquisition
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Task name: Data capture (laser cloud points)
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Scanning Place: Visual Computing Lab, Information Science and Tech-
nologies, National Research Council, Pisa, Italy
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Scanned by: Marco Callieri
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Purpose: research (World Heritage preservation)
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Description: One side or face of the cultural heritage object is scanned.
◦
3D Scanner model (hardware): MINOLTA VI - 900/910 [
210
]
input: original cultural heritage object
input digital items: none;
output digital items: a range map in PLY format [
211
], [
212
] representing
the scanned face of the cultural heritage object.
◦
Task information:
Scanner resolution: 0.1 mm
Scanning distance: between 0.6 and 1.2 m
Total amount range-map: 11 range maps (laser capture acquisitions, each
one corresponding to one side/face of the cultural heritage object) where
necessary;
Plate rotation angle: none
Time for acquisition: 30 min.
•
Geometric registration or alignment of each individual range map so that all
can fit together to build the final single range map:
◦
Task name: Alignment Session
◦
Description: All the different range-maps (each with its own geometry and/or
coordinate system) have to be transformed in order to obtain range-maps with
a uniform and common coordinate system. In this task each individual range
map is transformed into a new coordinate system (in other words, a matrix
transformation).
◦
Software: MeshLab [
213
]
◦
Input digital items: original PLY files coming from the laser scanner
◦
Output digital items: geometrically corrected/transformed PLY files.
Representation Information of the process stored in an ALN file and MA2 file
◦
Task information: The user identifies control points on each pair of the range
maps and asks software to transform range_map1 to match with the geometry
of range_map2. The same process is applied to each individual range map.
MA2 file describes each individual step.
