Holography is considered as one of the most remarkable discoveries in modern times. Nevertheless for its first decades it seems to be getting forgotten.

Originally stepped up back at the end of the 1940s to improve electron microscopy, it can not fulfill this function and the wish of its discoverer hungarian-british physicist Dennis Gábor. Due to sources of pure coherent light, which are indispensable for optical holography, being not yet available, not even Gábor himself can locate a field of application for this phenomenon. He can neither recognize at that point of time the meaning and the potential of his discovery and with it the influence this new medium would have on our daily lives one day. Nor can he imagine the plenty of phantasms emerging from this phenomenen. Phantasms, which seem to be mostly one step ahead of applied holography.

With the discovery of laser light at the beginning of the 1960s, for the first time ever it becomes possible to record and reconstruct a real three-dimensional image of an object. What once simply starts as a little rainbow coloured picture of a toy train, today finds its applications in a vast variety of different optical and acoustical fields.

It is as remarkable as the phenomenon of holography itself, that it could never prevail as a popular medium like movie, TV, radio, the internet, print media, etc. Especially when keeping in mind all the phantasmatic stories which emerge from this medium. A lot of dreams, hopes and promises that holography never made by itself, but some of them is trying to keep.

blog.holographie.eu accompanies my scientific work on holography, which would like to give holography an attention, that elsewhere is mostly refused to it. It is of course initially interested in based techniques and technologies of holography and how it works. Moreover it is also interested in these upcoming phantasms and their stories arising from possible abilities of holography. Especially against the backdrop of holography seems to be reaching a point, where its possibilities and abilities catch phantasms.

This blog would like to serve as a sketch book for unprotected ideas, of which some maybe become expanded, while others are not haunted any further, but wants to be told and should not be unmentioned forgotten.


please visit also www.holographie.eu

2010-02-21

Hand tracking

Giving a tactile sensation to holography, besides of course a projection of a floating three dimensional image, among others a tracking system is needed, which works as an interface between hologram and human. As it is shortly shown in the attached video in entry Touchable holography a Wii Remote can be used as a simple tracking system.

Johnny Chung Lee gives a little more detailed view on how the Wii Remote tracking system works. Even he applies it in another context than holography, that ought to be shown below, because the mechanics behind it is of the same kind.


Wii Remote tracking system


"While camera-based and marker-less hand tracking systems are demonstrated these days, we use Wiimote (Nintendo) which has an infrared (IR) camera for simplicity. A retroreflective marker is attached on the tip of user's middle finger. IR LEDs illuminate the marker and two Wiimotes sense the 3D position of the finger. Owing to this hand-tracking system, the user can handle the floating virtual image with their hands."

To give a more complete understanding of how touchable holography - as Shinoda Lab from University of Tokyo presents it at SIGGRAPH 2009 - works, another entry about airborne ultrasound tactile display is added.

The snippet attached below wants to illustrate what Johnny Chung Lee is talking above about Minority report.


Minority report (2002)


This movie forestalls the technology of hand tracking several years prior it finds application in combination with holography. So to say the technology catches the phantasm of user interface including hand tracking.



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