ULTRA-REALISTIC IMAGING AND OPTOCLONES TM

Proccedings of the 11th International Symposium on Display Hologrpahy, 2018

True-colour holograms, as they are the most advanced and realistic three-dimensional images obtainable with current technologies, can become valuable tools for the preservation, documentation and public diffusion of cultural heritage. In this respect, the transportable Z3 RGB colour holography system and the HoLoFoS™ illuminant developed by the Hellenic Institute of Holography have been successfully utilized for the in-situ recording and display of OptoClones™ (Denisyuk-type colour holograms) in four museums and two countries. The holographic image of an OptoClone™ is characterized by a wide angle of view, full parallax and perspective, good colour rendition and ultra-realistic reproduction of the optical properties of the materials of an artifact. In this paper, we report on our accumulated expertise in on-site holographic documentation of museum artworks of various types, already from four museums of world caliber and reputation (Athens and Thessaloniki Byzantine, Fabergé Museum of St. Petersburg and Moscow Diamond Fund of Russia). In one case, a world's first, the in-situ recorded OptoClones™ have been subsequently displayed as part of the permanent exhibition of the Byzantine & Christian Museum of Athens in replacement of the original artifacts while on loan. On another occasion involving State Treasures from the Diamond Fund of Russia, the recorded OptoClones™ exhibited inside the Moscow Kremlin were highly appraised by government officials and international experts as well as the general public allowing renewed reasonable optimism for the future prospects of Display Holography for museums.

Proceedings 10th International Symposium on Display holography

Color holography provides the means for the most advanced capture and reproduction of three dimensional images. The Hellenic Institute of Holography transportable Z3RGB color holography system and the HoLoFoS illuminator have been successfully tested by recording and subsequently displaying OptoClones® of artifacts in the Byzantine & Christian Museum of Athens , the Museum of Byzantine Culture of Thessaloniki and the Faberge Museum of Saint Petersburg.

Journal of Imaging, 2019

True-color holograms, as they are the most advanced and realistic three-dimensional images obtainable with current technologies, can become valuable tools for the preservation, documentation and diffusion of cultural heritage. In this respect, the transportable Z3RGB color holography system and the HoLoFoSTM illuminant developed by the Hellenic Institute of Holography have been successfully utilized for the in-situ recording and displaying of OptoClonesTM (Denisyuk-type color holograms) in four museums and two countries. The holographic image of an OptoCloneTM is characterized by a wide angle of view, full parallax and perspective, good color rendition and ultra-realistic reproduction of the optical properties of the materials of an artefact. In this paper, we report on our accumulated expertise in on-site holographic documentation of museum artworks of various types, already from four museums of world caliber and reputation (Athens and Thessaloniki Byzantine, Fabergé Museum of St. ...

SUMMARY:mma Ultra-high resolution holograms are now finding commercial and industrial applications in such areas as museum artefact displays, holographic maps, 3D medical imaging, and advertising. Ultra-Realistic Imaging: Advanced Techniques in Analogue and Digital Colour Holography brings together a comprehensive discussion of key methods that enable holography to be used as a technique of ultra-realistic imaging. After a historical review of progress in holography, the book: • Discusses CW recording lasers, pulsed holography lasers, and reviews optical designs for many of the principal laser types with emphasis on attaining the parameters necessary for digital and analogue colour holography • Gives a full review of current photosensitive materials for colour holography • Covers modern methods of analogue colour holography and digital holographic printing • Introduces mathematical and geometrical notation for horizontal parallax-only holograms and practical computational algorithms for the full-parallax case • Reviews systems and the image processing algorithms required to convert the raw image data to the format required by digital printers for colour holograms • Develops the physical theory of the holographic grating and the hologram • Provides an up-to-date review of illumination sources, including LED and laser diode sources Written by leaders in colour holography, this handbook provides complete coverage of colour holographic techniques, including applications. The book covers not only the optics and theory behind such holographic 3D imaging techniques, but also laser technologies, recording devices, data acquisition and processing techniques, materials for recording colour holograms, and current applications of ultra-realistic images used in museums and for other display purposes. The book can be ordered from CRC Press:

In this paper we will present the Z-Lab transportable color holography system, the HoLoFoS illuminator and results of actual in situ recording of color Denisyuk holograms of artifacts on panchromatic silver halide emulsions. Z-lab and HoLoFoS were developed to meet identified prerequisites of holographic recording of artifacts: a) in situ recording b) a high degree of detail and color reproduction c) a low degree of image distortions. The Z-Lab consists of the Z3 RGB camera, its accessories and a mobile darkroom. HoLoFoS is an RGB LED-based lighting device for the display of color holograms. The device is capable of digitally controlled intensity mixing and provides a beam of uniform color cross section. The small footprint and emission characteristics of the device LEDs result in a narrow band, quasi point source at selected wavelengths. A case study in recording and displaying 'Optical Clones' of Greek cultural heritage artifacts with the aforementioned systems will also be presented.

Practical Holography XXVIII: Materials and Applications, 2014

Recent improvements in key foundation technologies are set to potentially transform the field of Display Holography. In particular new recording systems, based on recent DPSS and semiconductor lasers combined with novel recording materials and processing, have now demonstrated full-color analogue holograms of both lower noise and higher spectral accuracy. Progress in illumination technology is leading to a further major reduction in display noise and to a significant increase of the clear image depth and brightness of such holograms. So too, recent progress in 1-step Direct-Write Digital Holography (DWDH) now opens the way to the creation of High Virtual Volume Displays (HVV)-large format full-parallax DWDH reflection holograms having fundamentally larger clear image depths. In a certain fashion HVV displays can be thought of as providing a high quality full-color digital equivalent to the large-format laser-illuminated transmission holograms of the sixties and seventies. Back then, the advent of such holograms led to much optimism for display holography in the market. However, problems with laser illumination, their monochromatic analogue nature and image noise are well cited as being responsible for their failure in reality. Is there reason for believing that the latest technology improvements will make the mark this time around? This paper argues that indeed there is.

The 1964 publication by Emmett Leith and Juris Upatnieks [J. Opt. Soc. Am. 54, 1295 (1964)] introduced the possibility of using holograms to record three-dimensional (3D) objects. Since then, there has been an interest in creating display holograms, i.e., holograms primarily produced to show objects in 3D. More recently, full color holography has become a reality, which was predicted in the 1964 paper. To record a hologram in which both the 3D shape and the color of the object are accurately reproduced, at least three laser wavelengths are needed. By computer simulation of the holographic color rendering process, the required amount of laser wavelengths and their distribution within the visible electromagnetic spectrum have been investigated. The quality of a color hologram also depends on the properties of the recording material. The demand on a panchromatic material for color holography is described. Recording techniques for color holograms are presented as well as the future of color holography as the perfect 3D imaging technique.

Illuminating Instruments, 2009

On the history and varied purposes for publicly displaying holograms

Holographic Imaging and Materials, 1994

The presentation of large holograms in travelling exhibitions has always posed problems, mainly due to lack of space. Since 1980, the Museum of Holography has presented many large holograms produced according to all techniques, including a reconstruction by argon laser. After the acquisition of the entire production of AP-Holography, nearly 80 holograms 1 mx1 m, 22 of these holograms were exposed in the first room of the museum at the Forum des Halles, the other turned in traveling exhibitions, as in France and abroad. Thanks to the modular structure designed by architect Fabien Vienne, this roaming is easy in the most diverse places.

2019

This paper discusses the main requirements in today's full-color holograms illumination and evaluates the last generation of LEDs, the actual best light source to render properly the colors of the holograms and in particular those recorded with red 660 nm, green 532 nm and blue 440 nm lasers. This paper presents also the first prototype of lamp designed especially for this kind of holograms.