Displacement monitoring system having vibration cancellation capabilities
First Claim
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.
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Abstract
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.
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Citations
13 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A process for measuring a structural displacement of one or more nonstationary features of an object comprising:
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generating, using one or more digital cameras, digital image information corresponding to the one or more nonstationary features of the object in a sequence of frames having a frame rate; converting each frame of the digital image information into a template; comparing, in sequence, each template to identify a displacement of the template, the sequence being to compare a subsequent template against a previous template; subtracting displacement of the template that does not correspond to spatial displacement of the object, the subtracting further comprising subtracting from the displacement of one or more nonstationary features in the template the corresponding displacement of a substantially stationary reference feature in the template that occurs simultaneous to displacement of the one or more nonstationary features; and measuring, continuously over a period of 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 displacement of the one or more nonstationary features. - View Dependent Claims (8, 9)
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10. A method for measuring a structural displacement of one or more nonstationary target features of an object comprising:
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generating, in a sequence of frames having a frame rate, digital image information corresponding to the one or more nonstationary target features of the object and one or more substantially stationary reference features of the object using one or more digital cameras; analyzing the digital image information corresponding to the one or more nonstationary features and the digital image information corresponding to the one or more stationary features with the aid of the processor configured to convert the each frame of the digital image information into a template, to compare each template in sequence, the sequence being to compare a subsequent template against a previous template, to subtract displacement of the substantially stationary reference feature, and to further subtract the displacement of one or more nonstationary target features in the template the corresponding displacement of one of the substantially stationary reference features in the template that occurs simultaneous to displacement of the one or more nonstationary features to thereby measure displacement of the one or more nonstationary features 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 displacement of the one or more nonstationary features. - View Dependent Claims (11, 12, 13)
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Specification