Browsing NTNU Open by Author "Akram, Muhammad Nadeem"
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The effects of source resolution on resolution enhancement through shifted superimposition projection
Hansen, Svein Arne Jervell; Hardeberg, Jon Yngve; Akram, Muhammad Nadeem (Peer reviewed; Journal article, 2020)Resolution in a projected display is traditionally defined by the number of pixels in the projector's spatial light modulator (SLM). In recent years, different techniques that increase the resolution on the screen above ... -
Fourier ptychography algorithm based on scaled Fourier transform
Hasanzade, Mojde; Hussain, Nazabat; Breiby, Dag Werner; Akram, Muhammad Nadeem (Peer reviewed; Journal article, 2021)This letter discusses an alternative Fourier ptychography algorithm based on the scaled fast Fourier transform propagation. The advantage of this scheme is that it enables a zoom-in capability of the object spectrum and ... -
High-resolution polarization-sensitive Fourier ptychography microscopy using a high numerical aperture dome illuminator
Gholamimayani, Mahdieh; Tekseth, Kim Robert Bjørk; Breiby, Dag Werner; Klein, Joern; Akram, Muhammad Nadeem (Peer reviewed; Journal article, 2022)Polarization-sensitive Fourier-ptychography microscopy (pFPM) allows for high resolution imaging while maintaining a large field of view, and without mechanical movements of optical-setup components. In contrast to ordinary ... -
Improved resolution Fourier ptychography scheme using oil-filled dome-shaped LED array
Gholamimayani, Mahdieh; Hussain, Nazabat; Breiby, Dag Werner; Akram, Muhammad Nadeem (Peer reviewed; Journal article, 2022)Utilising angular-varied illumination in Fourier Ptychography, the resolution of optical microscopes can be increased and the phase of the sample can also be recovered while maintaining a wide field-of-view. In this work, ... -
Preferred image quality metric for shifted superimposition-based resolution-enhanced images
Hansen, Svein Arne Jervell; Akram, Muhammad Nadeem; Hardeberg, Jon Yngve; Pedersen, Marius (Journal article; Peer reviewed, 2018)Shifted superimposition is a resolution-enhancement method that has gained popularity in the projector industry the last couple of years. This method consists of shifting every other projected frame spatially with subpixel ... -
Wide field-of-view Fourier Ptychography microscopy based on Fresnel propagation scheme
Hasanzade, Mojde; Breiby, Dag Werner; Akram, Muhammad Nadeem (Peer reviewed; Journal article, 2022)Fourier ptychographic microscopy (FPM) is a computational imaging method that gives a significantly increased space-bandwidth product, in practice high resolution combined with a wide field of view. In this article, we ...