Hogel

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For the municipality in Schleswig-Holstein in Germany, see Högel.

A hogel (a portmanteau of the words holographic and element) is a part of a light-field hologram, in particular a computer-generated one. In contrast to 2D pixels, hogels contain the direction and intensity of light rays from many perspectives, and is in essence what is referred to as a sub-aperture image in plenoptic imaging terms. Synthetic hogels are typically rendered through double-frustum, oblique slice & dice or polygonal/voxel ray-tracing/ray-casting. Research into efficient generation and compression of hogels may allow holographic displays to become more widely available.

An array of hogels can be used to reconstruct a light-field by emitting light through a microlens array or by reflective/transmissive photo-polymer holograms.

Hogel image plane with rendered hogel volume highlighted in red.

The first use of the term "hogel" was by Mark Lucente in his 1994 MIT Doctoral Thesis Dissertation.[1]

More recent examples include a paper presented at the SMPTE 2nd Annual International Conference on Stereoscopic 3D for Media and Entertainment entitled "The First 20 Years of Holographic Video – and the Next 20",[2] or in these recent book chapters: "Electronic Holography -- 20 Years of Interactive Spatial Imaging" in Handbook of Visual Display Technology[3] , and "Computational Display Holography" in Holographic Imaging.[4]

References[edit]

  1. ^ Lucente, Mark. "Diffraction-Specific Fringe Computation for Electro-Holography". MIT Dept. of Electrical Engineering and Computer Science. Retrieved Sep 1994.  Check date values in: |accessdate= (help) See, for example, page 55 in "Chapter 4: Diffraction-Specific Computation", or the "Glossary of Terms and Abbreviations" in Appendix A on page 151.
  2. ^ Lucente, Mark. "The First 20 Years of Holographic Video -- and the Next 20" (PDF). Society of Motion Picture and Television Engineers (SMPTE). 
  3. ^ Chen (2011). Handbook of Visual Display Technology. Springer-Verlag. ISBN 978-3-540-79566-7. 
  4. ^ Benton, Stephen A. (2008). Computational Display Holography. Wiley-Interscience. ISBN 978-0-470-06806-9. 

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