Portable measurement system using image and point measurement de

Details Portable measurement system using image and point measurement de Portable measurement system using image and point measurement de

1997-07-07

1998-09-08

Pham, Hoa Q.

Optics: measuring and testing

By polarized light examination

With light attenuation

356375, 364560, 382285, 395119, G01B 1124

Patent

active

058052895

ABSTRACT:
Calibrated spatial reference devices (SRDs) of known dimensions having targets at known relative locations are attached to a large structure to be measured. A design device employs a digital camera to acquire digital images of `islands` of the structure including the SRDs and employs photogrammetry techniques to determine relative locations of `islands` within a large structure. A highly accurate coordinate measurement device provides absolute 3D measured locations of the targets used to convert the relative photogrammetry locations into absolute 3D locations. A monitor displays the digital images, measured 3D locations, photogrammetry locations in a superimposed manner to a user and a user interface allows the user to select objects to be measured. Image detection techniques are used to identify objects selected by a user and dimensions, and distances between selected objects are automatically calculated. A remote link allows remote users to interact with the device to view, select structures and measure dimensions. The device is also capable of storing any type of imagery, notes, voice annotations, and also capable of retrieving archived information. This allows a time-lapse playback of objects indicating wear or corrosion.

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