A hogel (a

portmanteau In linguistics, a blend—also known as a blend word, lexical blend, or portmanteau—is a word formed by combining the meanings, and parts of the sounds, of two or more words together.

of the words ''holographic'' and ''element'') is a part of a light-field

hologram Holography is a technique that allows a wavefront to be recorded and later reconstructed. It is best known as a method of generating three-dimensional images, and has a wide range of other uses, including data storage, microscopy, and interf ...

, in particular a computer-generated one. It is considered a small holographic optical element or HOE and that its total effect to that of a standard hologram only that the resolution is lower and it involves a pixelated structure. An array of these elements form the complete image of a holographic recording, which is typically displayed in 3D free-viewing device. In contrast to 2D

pixel In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a Raster graphics, raster image, or the smallest addressable element in a dot matrix display device. In most digital display devices, p ...

s, 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. The use of hogels eliminates the limitation on the number and size of pixels as well as the size of the lenses that constitute the lens array because the holograms are no longer physical entities. Recorded information in a hogel is through the object beam. Hogel Plane

Development

The term "hogel" was coined by Mark Lucente who first used it in his 1994

MIT The Massachusetts Institute of Technology (MIT) is a private research university in Cambridge, Massachusetts, United States. Established in 1861, MIT has played a significant role in the development of many areas of modern technology and sc ...

Doctoral Thesis Dissertation. More recent examples include a paper presented at the

SMPTE The Society of Motion Picture and Television Engineers (SMPTE) (, rarely ), founded by Charles Francis Jenkins in 1916 as the Society of Motion Picture Engineers or SMPE, is a global professional association of engineers, technologists, and e ...

2nd Annual International Conference on

Stereoscopic Stereoscopy, also called stereoscopics or stereo imaging, is a technique for creating or enhancing the illusion of depth in an image by means of stereopsis for binocular vision. The word ''stereoscopy'' derives . Any stereoscopic image is ...

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''.

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A video showing the rapid writing time of the 3D display systemHogel RenderingHogel Rendering Performance3D hogel render video

Development

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Further reading