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Cambridge, United Kingdom

Buckley E.,Light Blue Optics
Optics Letters | Year: 2010

It is shown that the lens count in a Fourier holographic projector can be reduced by encoding the equivalent lens power in sets of Fresnel holograms. By using appropriately calculated Fresnel holograms in a reflective configuration to effectively share a lens between the beam-expansion and demagnification stages of a holographic projector, a reduction in lens count from four to one is demonstrated. © 2010 Optical Society of America. Source


Buckley E.,Light Blue Optics
IEEE/OSA Journal of Display Technology | Year: 2011

Phase-only holographic projection offers a number of advantages over conventional imaging projection technology. Despite the advances in image quality provided by multiple subframe approaches, however, the use of binary phase holograms fundamentally limits the achievable resultant image contrast ratio. In this paper, a FPGA implementation of a real-time parallelized error diffusion algorithm is presented as a practical solution to this problem. © 2011 IEEE. Source


Buckley E.,Light Blue Optics
IEEE/OSA Journal of Display Technology | Year: 2011

Phase-only holographic projection has prompted a great deal of research and has often been cited as a desirable method of 2-D image formation, since such a technique offers a number of advantages over conventional imaging projection technology [1], [2]. Although holographic image formation was demonstrated some forty years ago [3], efforts at realizing a real-time 2-D video projection system based on this technique have not been successful, principally due to the computational complexity of calculating diffraction patterns in real time and the poor quality of the resultant images. In this paper, a new approach to hologram generation and display is presented which overcomes both of these problems, enablingfor the first timea high-quality real-time holographic projector. © 2006 IEEE. Source


Patent
Light Blue Optics | Date: 2014-12-19

We describe a touch sensing system projecting light defining a touch sheet above a surface and a camera to capture a touch image of light scattered by a pen intersecting the touch sheet. A signal processor identifies a lateral location of the pen. The pen includes a light source to provide a light signal, and the system also includes two photodiodes to detect the signal from the pen. The touch detection is augmented by modelling the signals received at the photodiodes, dependent on the distance and angle of a pen, and using this to derive a probability of the observed received signals given the pen location determined from the touch sheet. This information can be used, for example, to allocate identities to the pens.


Patent
Light Blue Optics | Date: 2013-03-25

A touch sensing system, for sensing the position of at least one object with respect to surface, the system comprising: a first, 2D touch sensing subsystem to detect a first location of said object with respect to a surface and to provide first location data; a second, object position sensing subsystem to detect a second location of said object, wherein said second location of said object is not constrained by said surface, and to provide second location data; a system to associate said first location data and said second location and to determine additional object-related data from said association; and a system to report position data for said object, wherein said position data comprises data dependent on at least one of said first and second locations and on said additional object-related data.

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