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PTZ Camera-Based Displacement Sensor System with Perspective Distortion Correction Unit for Early Detection of Building Destruction

View Article: PubMed Central - PubMed

ABSTRACT

This paper presents a pan-tilt-zoom (PTZ) camera-based displacement measurement system, specially based on the perspective distortion correction technique for the early detection of building destruction. The proposed PTZ-based vision system rotates the camera to monitor the specific targets from various distances and controls the zoom level of the lens for a constant field of view (FOV). The proposed approach adopts perspective distortion correction to expand the measurable range in monitoring the displacement of the target structure. The implemented system successfully obtains the displacement information in structures, which is not easily accessible on the remote site. We manually measured the displacement acquired from markers which is attached on a sample of structures covering a wide geographic region. Our approach using a PTZ-based camera reduces the perspective distortion, so that the improved system could overcome limitations of previous works related to displacement measurement. Evaluation results show that a PTZ-based displacement sensor system with the proposed distortion correction unit is possibly a cost effective and easy-to-install solution for commercialization.

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Related in: MedlinePlus

Image results from the perspective transformation process.
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sensors-17-00430-f011: Image results from the perspective transformation process.

Mentions: As explained earlier in Section 2.1, related to constructing preset data, image acquisition and template matching begins by automatically setting the PTZ coordinates of the i-th marker from relevant marker images. In Figure 11a,b both images are acquired in processing parts. This is achieved by automatically setting the PTZ coordinates of the location in the preset data as , , , respectively. The displacement on the marker is represented by an arrow in Figure 11a,b. Figure 11c,d are the result of perspective transformation, which are done by the calculation of the H matrix from the images captured in the previous level for Figure 11a,b respectively.


PTZ Camera-Based Displacement Sensor System with Perspective Distortion Correction Unit for Early Detection of Building Destruction
Image results from the perspective transformation process.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5375716&req=5

sensors-17-00430-f011: Image results from the perspective transformation process.
Mentions: As explained earlier in Section 2.1, related to constructing preset data, image acquisition and template matching begins by automatically setting the PTZ coordinates of the i-th marker from relevant marker images. In Figure 11a,b both images are acquired in processing parts. This is achieved by automatically setting the PTZ coordinates of the location in the preset data as , , , respectively. The displacement on the marker is represented by an arrow in Figure 11a,b. Figure 11c,d are the result of perspective transformation, which are done by the calculation of the H matrix from the images captured in the previous level for Figure 11a,b respectively.

View Article: PubMed Central - PubMed

ABSTRACT

This paper presents a pan-tilt-zoom (PTZ) camera-based displacement measurement system, specially based on the perspective distortion correction technique for the early detection of building destruction. The proposed PTZ-based vision system rotates the camera to monitor the specific targets from various distances and controls the zoom level of the lens for a constant field of view (FOV). The proposed approach adopts perspective distortion correction to expand the measurable range in monitoring the displacement of the target structure. The implemented system successfully obtains the displacement information in structures, which is not easily accessible on the remote site. We manually measured the displacement acquired from markers which is attached on a sample of structures covering a wide geographic region. Our approach using a PTZ-based camera reduces the perspective distortion, so that the improved system could overcome limitations of previous works related to displacement measurement. Evaluation results show that a PTZ-based displacement sensor system with the proposed distortion correction unit is possibly a cost effective and easy-to-install solution for commercialization.

No MeSH data available.


Related in: MedlinePlus