Hogel

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 micro-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 term "hogel" was coined by Mark Lucente who first used it 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

  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: |access-date= (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.

Further reading


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