Displacement monitoring system having vibration cancellation capabilities

摘要

Techniques for vision-based sensing of structural displacement of an object, are disclosed. An example system includes digital video cameras adapted to generate digital image information corresponding to features of the object, an input to receive the digital image information corresponding to the one or more features, a converter configured to convert the digital image information into templates, and a comparator to compare the templates in sequence and to subtract displacement of stationary reference features.

主权项

1. A system for measuring a structural displacement of an object using one or more digital video cameras adapted to generate digital image information corresponding to two or more features of the object in a sequence of frames having a frame rate, one of the features being a substantially stationary feature and at least one of the features being a nonstationary feature, comprising:
an input to receive the digital image information corresponding to the two or more features; a converter, coupled to the input, configured to convert each frame of the digital image information corresponding to the two or more features into a template; and
a comparator, coupled to the converter, to compare the templates in sequence, the sequence being to compare a subsequent template against a previous template, and to subtract displacement of the substantially stationary feature to thereby measure spatial displacement of the at least one nonstationary feature over time based on at least a distance between the object and the one or more digital video cameras and a zoom ratio of the one or more digital video cameras, the comparator further configured to subtract from the displacement of the at least one nonstationary feature in the template the corresponding displacement of a substantially stationary reference feature in the template that occurs simultaneous to displacement of the at least one nonstationary features.