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PHOTOGRAMMETRY

Photogrammetry is the science of making measurements from photographs. GILLENgineering specializes in close-range photogrammetry of every kind of object. This technology is appropriate when measuring an object directly is too time consuming, when the object is too large or too small to measure directly and when harsh environmental conditions prevent direct measurement. Contact us via phone, fax or mail by visiting our HOME PAGE or by E-Mail at our FEEDBACK page.

Key Benefits

[Bullet] Quality and Customer Oriented
[Bullet] Strong Academic, R&D and Industrial Background
[Bullet] Personalized Cost Effective Services and Timely Responses

Capabilities

GILLENgineering offers photogrammetric services supported by photographic and computer hardware and software backed up with 23 years experience in close-range photogrammetry. Areas serviced include archaeological, architectural, forensic and industrial.

PhotoModeler™
This photogrammetric program, developed and marketed by EOS Systems, Inc., is an extremely flexible tool for measuring just about anything. It is a program that "transforms photographs into 3D models." With several pictures of the same object taken from different locations, the intersections of light rays from the various camera stations intersect at only one point. With selective placement of the camera stations, adequate lighting and some minimal knowledge of the size of the object being photographed, a 3D full-scale math model of the object is generated and can be output to almost any CAD format. This photogrammetric process utilizes the statistical strength of a least squares algorithm to minimize the sum of the squares of the errors. This provides for high accuracy measurements when field and photographic processes are done with care.
 
 
Calibrated Metric Camera
A quality 35mm SLR camera has been calibrated to strengthen the results and increase the accuracy of the models developed for measuring. By knowing precisely the focal length and the principle point (film location where the light rays coming through the lens strike perpendicularly) and including fiducials for film registration, the internal geometry of the cameral can be extended out through the lens to the scene being photographed. This geometric information is included in the least squares statistical calculations and provides additional stability for the resulting 3D math model.

CAD
Computer Aided Drafting (CAD) provides one medium for presentation of the 3D math model. CAD is also used to give the model a surface, called rendering, and to provide colors and textures and to add other dimensional information of interest to the original photogrammetric math model. CAD is also used to prepare an accurately scaled object for use in an animation. Through this photogrammetric process, a viewer of an animation, can be looking at a dimensionally accurate representation of the original object.
 
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Last modified: February 08, 2005