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A summary of the terahertz imaging radar of the heterodyne and homodyne scheme is presented, with an emphasis on the differences between the two schemes. The transmitters employ Direct Digital Waveform Synthesis (DDWS) in the baseband so that the reliable fast scanning frequency synthesizers are obtained to meet the fast imaging requirement. The scanning speed is 40us with an instantaneous bandwidth...
Terahertz imaging scheme with simplified single homodyne channel was proposed. To realize the calibration and coherent imaging, a Hilbert transform receiver was employed to recover the quadrature signal and obtain the phase information of the return wave. Proof-of-State experiment at 0.22THz band was performed to verify the effectiveness of the proposed imaging scheme, which may find potential applications...
Face Super Resolution(FSR) is to infer High Resolution(HR) facial images from given Low Resolution(LR) ones with the assistance of LR and HR training pairs. Among existing methods, local patch based methods are superior in visual and objective quality than global based methods. These local patch based methods are based on the consistency assumption that the neighbors in HR/LR space form similar local...
Doppler ambiguity number (DAN) is an important parameter in synthetic aperture radar (SAR) imaging. Erroneous DAN will affect the image quality with lower image signal-to-noise ratio (SNR) and degradation in the system impulse response function. In this paper, a novel Doppler ambiguity resolver based on contrast maximization is proposed. The new algorithm employs candidate DANs to make linear range...
We present an imaging framework to acquire 3D surface scans at ultra high-resolutions (exceeding 600 samples per mm2). Our approach couples a standard structured-light setup and photometric stereo using a large-format ultra-high-resolution camera. While previous approaches have employed similar hybrid imaging systems to fuse positional data with surface normals, what is unique to our approach is the...
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