This paper experimentally investigates, for the first time, a new wavelength-division multiplexing-based visible light communications link based on defocused non-imaging multiple-input multiple-output (MIMO), which removes need tuned optical bandpass filters paired with each receiver. The proposed system is using natural diversity of individual emitting diodes (LEDs) within single source to gen...

Optothermal interaction of active colloidal matter can facilitate environmental cues, which influence the dynamics soft systems. The optically induced thermal effect be harnessed to study non-equilibrium thermodynamics as well applied self-propel colloids and form assemblies. In this work, we employ a defocused laser trap self-evolving matter. optothermal in both focused optical traps has been ...

The defocus blur concept adds an artistic effect and enables enhancement in the visualization of image scenery. Moreover, some specialized computer vision fields, such as object recognition or scene restoration enhancement, might need to perform segmentation separate blurred non-blurred regions partially images. This study proposes a sharpness measure comprised Local Binary Pattern (LBP) descri...

FIG. 1. The GDPTV method is based on a single-camera setup for determining the 3D particle positions via defocused particle images, where the particle images change as function of the depth coordinate. To get a target particle position, the particle image is compared to a set of calibration images by use of the normalized cross-correlation. The out-of-plane coordinate for the target particle is...

We introduce a bifocal imaging method that enables three-dimensional (3D) tracking of both fluorescent and nonfluorescent particles. We accomplish this by simultaneously imaging a focused plane, for in-plane position (x,y), and a defocused plane, for out-of-plane position (z), of a molecule using a single CCD camera. We applied our method to several systems including in vivo melanosome tracking...

When detecting an image in the optical microscope the phase of the wave function forming it gets lost. This phase carries valuable information about variations in the refractive index of the transmitted material, or the topography of the object characterized in reflection. We provide an overview of different reconstruction algorithms developed in our lab to recover this phase information from a...

We present a 3-D shape-measurement technique using a defocused projector. The ideal sinusoidal fringe patterns are generated by defocusing binary structured patterns, and the phase shift is realized by shifting the binary patterns spatially. Because this technique does not require calibration of the gamma of the projector, it is easy to implement and thus is promising for developing flexible 3-...

Novel caustic phenomena, which contain fold, butterfly and elliptic umbilic catastrophes, are observed in defocused images of two approximately collinear oppositely biased metallic tips in a transmission electron microscope. The observed patterns depend sensitively on defocus, on the applied voltage between the tips and on their separation and lateral offset. Their main features are interpreted...

In this paper, we propose a new heuristic algorithm for three-dimensional image reconstruction from coded aperture images based on simulated annealing (SA). Since coded aperture can view an object with a large solid angle, it can provide some tomographic resolution for three-dimensional object. We propose to use a heuristic algorithm to remove the defocused artifacts and to improve the tomograp...