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17 October 2006 Combined optimal quantization and lossless coding of digital holograms of three-dimensional objects
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Proceedings Volume 6392, Three-Dimensional TV, Video, and Display V; 63920A (2006)
Event: Optics East 2006, 2006, Boston, Massachusetts, United States
Digital holography is an inherently three-dimensional (3D) technique for the capture of real-world objects. Many existing 3D imaging and processing techniques are based on the explicit combination of several 2D perspectives (or light stripes, etc.) through digital image processing. The advantage of recording a hologram is that multiple 2D perspectives can be optically combined in parallel, and in a constant number of steps independent of the hologram size. Although holography and its capabilities have been known for many decades, it is only very recently that digital holography has been practically investigated due to the recent development of megapixel digital sensors with sufficient spatial resolution and dynamic range. The applications of digital holography could include 3D television, virtual reality, and medical imaging. If these applications are realized, compression standards will have to be defined. We outline the techniques that have been proposed to date for the compression of digital hologram data and show that they are comparable to the performance of what in communication theory is known as optimal signal quantization. We adapt the optimal signal quantization technique to complex-valued 2D signals. The technique relies on knowledge of the histograms of real and imaginary values in the digital holograms. Our digital holograms of 3D objects are captured using phase-shift interferometry. We complete the compression procedure by applying lossless techniques to the quantized holographic pixels.
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Alison E. Shortt, Thomas J. Naughton, and Bahram Javidi "Combined optimal quantization and lossless coding of digital holograms of three-dimensional objects", Proc. SPIE 6392, Three-Dimensional TV, Video, and Display V, 63920A (17 October 2006);

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