Yuval Kapellner

Bio: Yuval Kapellner is an academic researcher from Bar-Ilan University. The author has contributed to research in topics: Adaptive optics & Wavefront. The author has an hindex of 6, co-authored 14 publications receiving 412 citations.

Image projecting device and method

Abstract: An image projecting device and method are presented. The device comprises a light source system operable to produce a light beam to impinge onto an active surface of a spatial light modulator (SLM) unit formed by an SLM pixel arrangement; and a magnification optics accommodated at the output side of the SLM unit. The light beam impinging onto the SLM pixel arrangement has a predetermined cross section corresponding to the size of said active surface. The SLM unit comprises first and second lens' arrays at opposite sides of the pixel arrangement, such that each lens in the first array and a respective opposite lens in the second array are associated with a corresponding one of the SLM pixels

Optical system and method for use in projection systems

Abstract: An optical system and method are presented to produce a desired illuminating light pattern. The system comprises a light source (202) system configured and operable to produce structured light in the form of a plurality of spatially separated light beams; and a beam shaping arrangement (210). The beam shaping arrangement is configured as a diffractive optical unit configured and operable to carry out at least one of the following: (i) combining an array of the spatially separated light beams into a single light beam thereby significantly increasing intensity of the illuminating light; (ii) affecting intensity profile of the light beam to provide the illuminating light of a substantially rectangular uniform intensity profile.

Projection system and method

Abstract: An image projection system and method are presented to project an image on at least one of first and second projection planes. The system comprises a light source system (102) including one or more light source assemblies operable to generate light of one or more predetermined wavelength range; a spatial light modulator (SLM) system (104) including one or more SLM units operable to spatially modulate input light in accordance with an image to be directly projected or viewed; and two optical assemblies (106) associated with two spatially separated light propagation channels, respectively, to direct light to, respectively, the first and second projection planes with desired image magnification (108A, 108B). The system is configured to selectively direct the input light propagating towards the SLM system or light modulated by the SLM system to propagate along at least one of the two channels associated with the first and second projection planes, respectively.

Non-Invasive Imaging Through Scattering Medium by Using a Reverse Response Wavefront Shaping Technique.

Abstract: Fundamental challenge of imaging through a scattering media has been resolved by various approaches in the past two decades. Optical wavefront shaping technique is one such method in which one shapes the wavefront of light entering a scattering media using a wavefront shaper such that it cancels the scattering effect. It has been the most effective technique in focusing light inside a scattering media. Unfortunately, most of these techniques require direct access to the scattering medium or need to know the scattering properties of the medium beforehand. Through the novel scheme presented on this paper, both the illumination module and the detection are on the same side of the inspected object and the imaging process is a real time fast converging operation. We model the scattering medium being a biological tissue as a matrix having mathematical properties matched to the physical and biological aspects of the sample. In our adaptive optics scheme, we aim to estimate the scattering function and thus to encode the intensity of the illuminating laser light source using DMD (Digital Micromirror Device) with an inverse scattering function of the scattering medium, such that after passing its scattering function a focused beam is obtained. We optimize the pattern to be displayed on the DMD using Particle Swarm Algorithm (PSO) which eventually help in retrieving a 1D object hidden behind the media.

Method for production of micro-optics structures

Abstract: A novel method for fabricating a micro-optics structure, having at least one lenslet array, is presented. A writing mask is provided being configured in accordance with an arrangement of the lenslet array to be manufactured. The writing mask is applied to a structure formed by a photosensitive layer of a predetermined thickness carried by a substrate, and the photosensitive layer is exposed through the writing mask using a predetermined spectral range of the exposure and a predetermined distance between the mask and said photosensitive layer, to thereby pattern the photosensitive layer through a diffractive optical element of said mask. The so-obtained pattern is in the form of optical nonhomogeneities in the photosensitive layer material, defining the lenslet array within the photosensitive layer.

Methods and Systems for Content Processing

Abstract: Cell phones and other portable devices are equipped with a variety of technologies by which existing functionality can be improved, and new functionality can be provided. Some relate to visual search capabilities, and determining appropriate actions responsive to different image inputs. Others relate to processing of image data. Still others concern metadata generation, processing, and representation. Yet others relate to coping with fixed focus limitations of cell phone cameras, e.g., in reading digital watermark data. Still others concern user interface improvements. A great number of other features and arrangements are also detailed.

Lithographic apparatus, and device manufacturing method

Abstract: A lithographic apparatus configured to project a patterned beam of radiation onto a target portion of a substrate is disclosed. The apparatus includes a first radiation dose detector and a second radiation dose detector, each detector comprising a secondary electron emission surface configured to receive a radiation flux and to emit secondary electrons due to the receipt of the radiation flux, the first radiation dose detector located upstream with respect to the second radiation dose detector viewed with respect to a direction of radiation transmission, and a meter, connected to each detector, to detect a current or voltage resulting from the secondary electron emission from the respective electron emission surface.

Eyepiece with uniformly illuminated reflective display

Abstract: An eyepiece includes a mechanical frame adapted to secure a lens and an image source facility above the lens. The image source facility includes an LED, a planar illumination facility and a reflective display. The planar illumination facility converts a light beam from the LED received on a side of the planar illumination facility into a top emitting planar light source, uniformly illuminates the reflective display, and is substantially transmissive to allow reflected light to pass through towards a beam splitter. The beam splitter is positioned to receive the image light and to reflect a portion onto a mirrored surface. The mirrored surface is positioned and shaped to reflect the image light into an eye of a user of the eyepiece thereby providing an image within a field of view, the mirrored surface further adapted to be partially transmissive within an area of image reflectance.

Volume dimensioning systems and methods

Abstract: Systems and methods for volume dimensioning packages are provided. A method of operating a volume dimensioning system may include the receipt of image data of an area at least a first three-dimensional object to be dimensioned from a first point of view as captured using at least one image sensor. The system can determine from the received image data a number of features in three dimensions of the first three-dimensional object. Based at least on part on the determined features of the first three-dimensional object, the system can fit a first three-dimensional packaging wireframe model about the first three-dimensional object. The system can display of an image of the first three-dimensional packaging wireframe model fitted about an image of the first three-dimensional object on a display device.