Browsing by Author "Tamm, Oskar"

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    Realizing large-area diffractive lens using multiple subaperture diffractive lenses and computational reconstruction
    (Society of Photo-Optical Instrumentation Engineers (SPIE), 2023) Gopinath, Shivasubramanian; Xavier, Agnes Pristy Ignatius; Angamuthu, Praveen Periyasamy; Kahro, Tauno; Tamm, Oskar
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    Realizing large-area diffractive lens using multiple subaperture diffractive lenses and computational reconstruction
    (2023) Gopinath, Shivasubramanian; Xavier, Agnes Pristy Ignatius; Angamuthu, Praveen Periyasamy; Kahro, Tauno; Tamm, Oskar; Bleahu, Andrei; Arockiaraj, Francis Gracy; Smith, Daniel; Ng, Soon Hock; Juodkazis, Saulius; Kukli, Kaupo; Tamm, Aile; Anand, Vijayakumar
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    Super-resolution correlating optical endoscopy
    (Tartu Ülikool, 2024) Tamm, Oskar; Anand, Vijayakumar, juhendaja; Tiwari, Vipin, juhendaja; Gopinath, Shivasubramanian, juhendaja; Tartu Ülikool. Loodus- ja täppisteaduste valdkond; Tartu Ülikool. Füüsika instituut
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    Super-Resolution Correlating Optical Endoscopy
    (2024) Tamm, Oskar; Tiwari, Vipin; Gopinath, Shivasubramanian; Rajeswary, Aravind Simon John Francis; Singh, Scott Arockia; Rosen, Joseph; Anand, Vijayakumar
    Optical endoscopy is a widely used minimally invasive diagnostic tool for imaging internal organs. The imaging resolution is defined by the numerical aperture of the objective lens. In this study, we proposed and demonstrated a Super-resolution Correlating OPtical Endoscopy (SCOPE) system. In SCOPE, modified recording and reconstruction methods are introduced with the existing built-in endoscopy lens. Instead of recording a single image, multiple images of the object are recorded by scanning the tip of the endoscope around the object. The recorded low-resolution images of the object are arranged as sub-matrices in a 2D matrix. Another similar 2D matrix with either recorded or synthesized point spread functions (PSFs) is created. The 2D matrices of the object and the PSF were processed using a deconvolution algorithm to reconstruct a super-resolution image of the object. Both simulation and proof-of-concept experimental studies have been presented. SCOPE neither requires any additional optical element nor any changes in the endoscopy system itself; therefore, it can be easily implemented in commercial endoscopy systems.