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Through-Wall Imaging With UWB Radar System - KEMT FEI TUKE

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4.3 Highlighting of a Building Contours 72<br />

r<br />

1<br />

0<br />

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2<br />

W H<br />

0<br />

Part of the<br />

Hanning window<br />

[ rad]<br />

Fig. 4.3.4: Window function WH made up from Hanning window functions.<br />

SAR scanning<br />

Calibration and preprocessing<br />

2D SAR migration<br />

<strong>Wall</strong> and antennas compensation<br />

Merging data from more scans<br />

Image edges detection<br />

Hough Transform<br />

Filtering in Hough space<br />

Inverse Hough Transform<br />

<strong>Imaging</strong> detected building contours<br />

Fig. 4.3.5: Processing steps for imaging of building contours.<br />

Section 4.1, antenna beam compensation (4.1.16), and attenuation losses compensation<br />

(Section 4.3.1) were computed for all the scans.<br />

The migrated images from three scans were merged together (Fig. 4.3.7 b))<br />

and edges were detected (Fig. 4.3.7 c)). The HT was applied (Fig. 4.3.8 a)) and<br />

the peaks in positions close to θw were filtered with a sharp window function WH<br />

(Fig. 4.3.8 b)). The lines that represent the building walls were drawn over the<br />

migrated image after the IHT was performed (Fig. 4.3.8 c)).<br />

�<br />

2

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