SAN FRANCISCO Men's
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University in northern California have developed a system using 3 dimensional
(3-D) sensing technologies and a computer vision algorithm to acquire detailed
building information.
Newer buildings often have computerized blueprints and records, including details such as the number of rooms, doors and windows, and the square footage
of floors, ceilings and walls. But such information may not exist for older
buildings, necessitating the time-consuming and difficult task of collecting
these details manually for remodeling or refurbishing purposes.
The new system, presented by Stanford researchers at the Conference on Computer Vision and Pattern Recognition of the Institute of Electrical and
Electronics Engineers
(IEEE) Nike
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Friday, is designed to automate the process of getting detailed building
information, first by using light to measure every feature of a building' s
interior, room by room and floor by floor, to create a massive data file that
captures the spatial geometry of any building, and then by feeding the raw data
file into a new computer vision algorithm.
The algorithm identifies structural elements such as walls and columns, as well as
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"Renovation projects live and die by the quality of information," according to Martin Fischer, a Stanford professor of civil and environmental engineering.
The new process is the brainchild of Stanford doctoral student Iro Armeni, with interdisciplinary oversight from Silvio Savarese, a Stanford assistant
professor in computer science who leads the Computational Vision and Geometry
Lab, and Fischer, who heads the Center for Integrated Facility Engineering.
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said Savarese. "This is the first time it's possible to do it at the scale of
whole buildings, with hundreds of rooms."
Armeni, once an architect on the Greek island of Corfu, used to work on custom renovations on historical buildings hundreds of years old. She and
colleagues used tape measures to redraw building plans, a practice that is both
time-consuming and often inaccurate.
She began by replacing her tape measure with laser scanners and 3-D cameras, which use light to take measurements with up to millimeter accuracy. When placed
inside a
building Nike
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all directions, bathing every interior surface. By recording precisely how long
it takes for a beam of light to hit a given point in the room and bounce back,
they create a data file consisting of literally millions of measurements, about
specific points where beams of light encountered some surface. This massive data
file is called a raw point cloud.
However, humans had to look at the point cloud on a computer screen to identify building elements such as windows, walls, hallways and furniture and
then type that information into software tools. To the
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The Stanford team's innovation was developing a computer vision system that could analyze the point cloud for a building, distinguish the rooms, and then
categorize each element in each room. This automated the second half of the
process, the need for humans to annotate the data. While buildings vary in many
ways, including room size, purpose and interior decoration, this is where
machine learning and computer vision came in.
To train their computer vision system Nike Air Max DLX
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that humans had annotated. These annotations specified all sorts of building
features. Armeni managed the task of feeding this annotated point cloud data to
the algorithm.
Through repetition, the system "learned" to recognize different building elements. Ultimately, the researchers created an algorithm that can analyze raw
point cloud data from an entire building and, without human assistance, identify
the rooms, enter each room, and detail the structural elements and furniture.
"This kind of geometric Nike Air
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parts of the project," Savarese was quoted as saying by a news release from
Stanford.
Armeni hopes to move and project forward and create an algorithm that can track the whole life cycle of a building - through design, construction,
occupation and demolition. "As engineers, we shouldn't lose time trying to find
the current status of our building," she said. "We should invest this time in
doing something creative and making our buildings better."
Finance > Insurance > Health InsuranceHow To Select Affordable Health Insurance In Phoenix
Posted by nick_niesen in Finance on October 29th, 2010
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