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.
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", or in these recent book chapters: "Electronic Holography -- 20 Years of Interactive Spatial Imaging" in Handbook of Visual Display Technology , and "Computational Display Holography" in Holographic Imaging.
- Lucente, Mark. "Diffraction-Specific Fringe Computation for Electro-Holography". MIT Dept. of Electrical Engineering and Computer Science. Retrieved Sep 1994. See, for example, page 55 in "Chapter 4: Diffraction-Specific Computation", or the "Glossary of Terms and Abbreviations" in Appendix A on page 151.
- Lucente, Mark. "The First 20 Years of Holographic Video -- and the Next 20". Society of Motion Picture and Television Engineers (SMPTE).
- Chen (2011). Handbook of Visual Display Technology. Springer-Verlag. ISBN 978-3-540-79566-7.
- Benton, Stephen A. (2008). Computational Display Holography. Wiley-Interscience. ISBN 978-0-470-06806-9.
- "Holographic three-dimensional telepresence using large-area photorefractive polymer". Nature 468:80-83. 4 November 2010. doi:10.1038/nature09521.
- Klug, M., Burnett, T., Fancello, A., Heath, A., Gardner, K., O'Connell, S., Newswanger, C. (2013). "A Scalable, Collaborative, Interactive Light-field Display System", SID Symposium Digest of Technical Papers
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