Compressive Sensing Imaging at Sub-THz Frequency in Transmission Mode

Compressive sensing imaging at Sub-THz frequency in transmission mode Özkan, Vedat Ali; Menteşe, Yıldız; Takan, Taylan; Şahin, Asaf Behzat; Altan, Hakan (Springer, Dordrecht, 2017-01-01) Due to lack of widespread array imaging techniques in the THz range, point detector applications coupled with spatial modulation schemes are being investigated using compressive sensing (CS) techniques. CS algorithms coupled with innovative spatial modulation schemes which allow the control of pixels on the image plane from which the light is focused onto single pixel THz detector has been shown to rapidly generate images of objects. Using a CS algorithm, the image of an object can be reconstructed rapidly....
Compressive sensing imaging through a drywall barrier at sub-THz and THz frequencies in transmission and reflection modes Takan, Taylan; ÖZKAN, VEDAT ALİ; Idikut, Firat; Yildirim, Ihsan Ozan; ŞAHİN, ASAF BEHZAT; Altan, Hakan (2014-09-24) In this work sub-terahertz imaging using Compressive Sensing (CS) techniques for targets placed behind a visibly opaque barrier is demonstrated both experimentally and theoretically. Using a multiplied Schottky diode based millimeter wave source working at 118 GHz, metal cutout targets were illuminated in both reflection and transmission configurations with and without barriers which were made out of drywall. In both modes the image is spatially discretized using laser machined, 10 x 10 pixel metal aperture...
Compressive spectral imaging using diffractive lenses and multi-spectral sensors with learned reconstruction and joint optimization Gündoğan, Utku; Öktem, Sevinç Figen; Department of Electrical and Electronics Engineering (2022-2) Compressive spectral imaging aims to reconstruct the entire three-dimensional spectral cube from a few measurements, ideally with a snapshot capability. Recently various spectral imaging modalities have been developed by exploiting diffractive lenses. Another line of development in this area is enabled by spectral filter arrays which resulted in multi-spectral sensors. In this thesis, we first review an existing compressive spectral imaging modality with diffractive lenses and analyze its performance using ...
Waves on noncommutative spacetimes BALACHANDRAN, A P; GUPTA, KUMAR S; Kürkcüoğlu, Seçkin (2006-01-01) Waves on "commutative" spacetimes like R-d are elements of the commutative algebra C-0(R-d) of functions on R-d. When C-0(R-d) is deformed to a noncommutative algebra A(theta)(R-d) with deformation parameter theta (A(0)(R-d)=C-0(R-d)), waves being its elements, are no longer complex-valued functions on R-d. Rules for their interpretation, such as measurement of their intensity, and energy, thus need to be stated. We address this task here. We then apply the rules to interference and diffraction for d <= 4 a...
Super-Resolution Image Reconstruction Applied to an Active Millimeter Wave Imaging System based on Compressive Sensing Alkus, Umit; Ermeydan, Esra Sengun; ŞAHİN, ASAF BEHZAT; ÇANKAYA, İLYAS; Altan, Hakan (2017-09-11) The development of passive and active millimeter wave imaging systems is progressing rapidly fueled by the need for many applications in the area of security and defense. Imaging schemes that may either utilize array detectors or single detectors in scan architectures offer suffer from poor resolution due to the longer wavelengths used and the limits of the optical system in terms of lens and mirror dimensions. In order to overcome this limit, super-resolution techniques can be employed to enhance the resol...

Citation Formats

V. A. ÖZKAN, Y. Mentese, T. Takan, A. B. ŞAHİN, and H. Altan, “Compressive Sensing Imaging at Sub-THz Frequency in Transmission Mode,” 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36659.