Method for stand off inspection of target in monitored space
First Claim
1. A method for unveiling hidden dielectric objects in an interrogated area, comprising:
- recording a 3D microwave and a 3D optical range images of an interrogated scene at the same time moment, digitizing all images and overlapping them in one common coordinate system;
determining a distance between the 3D microwave and 3D optical images, and concluding the absence of hidden dielectric object where the optical distance is less than a threshold value, the distance being determined via calculating a dielectric permittivity constant ∈
;
further comprising concluding the presence of hidden dielectric objects if cavities are observed in the three-dimensional microwave image, where the distance is more than a threshold value l, and the cavities depth h is greater than a depth threshold
h0=l0(∈
1/2−
1)/∈
1/2).
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Abstract
This invention addresses remote inspection of target in monitored space. A three dimensional (3D) microwave image of the space is obtained using at least two emitters. The data undergoes coherent processing to obtain maximum intensity of the objects in the area. This image is combined with a 3D video image obtained using two or more video cameras synchronized with the microwave emitters. The images are converted into digital format and transferred into one coordinate system. The distance l is determined between the microwave and the video image. If l<lo, where lo is a given threshold, the absence of a concealed dielectric object at the target is indicated. If l>lo then the presence of cavities is analyzed. If the cavity depth h is greater than the threshold value ho a concealed dielectric object at the target is ascertained:
where ∈ is dielectric permeability of the sought dielectric object.
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Citations
18 Claims
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1. A method for unveiling hidden dielectric objects in an interrogated area, comprising:
recording a 3D microwave and a 3D optical range images of an interrogated scene at the same time moment, digitizing all images and overlapping them in one common coordinate system;
determining a distance between the 3D microwave and 3D optical images, and concluding the absence of hidden dielectric object where the optical distance is less than a threshold value, the distance being determined via calculating a dielectric permittivity constant ∈
;
further comprising concluding the presence of hidden dielectric objects if cavities are observed in the three-dimensional microwave image, where the distance is more than a threshold value l, and the cavities depth h is greater than a depth threshold
h0=l0(∈
1/2−
1)/∈
1/2).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system to unveil a hidden dielectric object in an interrogated area, comprising:
- at least two microwave (mw) sources and at least one mw receiver forming mw images of the interrogated area;
at least two optical range cameras recording the interrogated area;
a digital signal processor (DSP) receiving the microwave and optical images recorded at the same time and forming a three-dimensional (3D) mw image and a 3D optical image of the interrogated area, both 3D images are transferred into a common coordinate system and overlapped, and wherein a decision on an absence of hidden dielectric object is made after determining an optical distance between the 3D microwave and the 3D optical image, the distance being determined via calculating a dielectric permittivity constant ∈
, and the distance is less than a threshold value, further comprising wherein the presence of hidden dielectric objects is concluded if the distance is more than a threshold value l0, and cavities are observed in the three-dimensional microwave image in areas, where the distance is more than a threshold value l0, and the cavities'"'"' depth h is greater than a depth threshold h0=l0(∈
1/2−
1)/(∈
1/2). - View Dependent Claims (17, 18)
- at least two microwave (mw) sources and at least one mw receiver forming mw images of the interrogated area;
Specification