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Browsing by Author "Chung, P. S."

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    Optical image coding with a circular Dammann grating
    Doh, K. B.; Dobson, K.; Poon, Ting-Chung; Chung, P. S. (Optical Society of America, 2009-01-01)
    A circular Dammann grating in the front focal plane of a lens is used to generate an annular beam in the back focal plane to code an object by two-dimensional scanning. The coded image of the object is decoded digitally by convolving it with the same annular beam used to code the object. Simple inverse filtering is subsequently used to improve the contrast of the decoded image. (C) 2008 Optical Society of America
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    Three-dimensional complex image coding using a circular Dammann grating
    Shinoda, Y.; Liu, J. Ping; Chung, P. S.; Dobson, K.; Zhou, X.; Poon, Ting-Chung (Optical Society of America, 2011-03-01)
    Recently, optical image coding using a circular Dammann grating (CDG) has been proposed and investigated. However, the proposed technique is intensity based and could not be used for three-dimensional (3D) image coding. In this paper, we investigate an optical image coding technique that is complex-amplitude based. The system can be used for 3D image coding. The complex-amplitude coding is provided by a circular Dammann grating through the use of a digital holographic recording technique called optical scanning holography. To decode the image, along the depth we record a series of pinhole holograms coded by the CDG. The decoded reconstruction of each depth location is extracted by the measured pinhole hologram matched to the desired depth. Computer simulations as well as experimental results are provided. (C) 2010 Optical Society of America