Researchers at the University of Guadalajara, in Mexico, in collaboration with the University of the Republic in Uruguay designed a program of digital processing of 3D image from the projection and digitization of binary data that allows three-dimensional reconstruction of various objects in order to reproduce parts of classic automobiles, prehispanic antiques, as well as serving as a tool for face recognition.
This software performs a 3D scan of the original mechanical parts or faces to obtain a virtual model of the real dimensions (topographies) so they can be reproduced because they are no longer manufactured, said Jorge Luis Nuñez Flores, professor at the Department of Electronics of the University Center for Science in Engineering (CUCEI) of UDG.
"The reconstruction technique involves the projection and acquisition of binary patterns (stripes of clear and dark lights, deployed vertically and horizontally) using a commercial projector and a digital camera," said Nuñez Flores.
To obtain the 3D model, first a series of clear and dark lights are generated using a cannon, which must be projected laterally on the object to be scanned, then the 3D camera captures binary patterns (sequences lines) that are processed by the software to detected dimensions to form the model with the real measurements.
During this process eight filters are projected in different gray tones that serve to give volume, texture and correct definition to the object or face. After that the camera will capture the image sequence and transmit it to the software interface, where the model is presented in 3D, added the CUCEI professor.
One of the uses of the program designed by the UDG, is to manufacture pieces that are no longer available, although it is necessary to have the original object, for the technical specifications to be appropriate, and that the replica is functional.
"The technique developed by both research groups could be used for 3D scanning mechanical original parts, archaeological findings or the generation of virtual models respecting real dimensions (topographies)" the specialist explained.
In the case of facial recognition (biometrics), the 3D camera will not take photos, but obtain depth and facial features, information that will be used to determine traits that allow to identify a person.
Flores Núñez said the next step is to make the models compatible with current 3D printing technology, this in order that the digitized objects can easily be manufactured by this type of equipment.
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