Could anyone explain how dynamic holography is achieved?

[whoiswei]

​I recently saw in a Bilibili video (https://b23.tv/6AEyzmk) that holography can actually produce dynamic effects. I originally thought this could only be accomplished through computer-generated holography (CGH), so I am very curious about the specific principles behind it. The only method I can think of right now is multiple exposure, but that doesn't seem capable of producing the fluid effects shown in the video. I look forward to any professional insights!

[jrburns47]

All the examples shown appear to be “horizontal parallax only” which implies H1/H2 system using sequential adjacent slit exposures of 2D image sequences for H1 and then projection of H1 master onto and H2 hologram of overlapped frames recorded in H1.

For further research by you, suggest starting with papers by Dominick Debitteto and King, Noll and Berry.

See below for summaries about them and their early work:

“Dominic DeBitetto is a pioneering physicist and researcher credited with developing the first holographic panoramic stereogram in 1969. Working at Philips Research Laboratories, he created a groundbreaking method to stitch multiple 2D photographs or frames together to produce a single, continuous, 3D animated hologram.His contributions to the field of optics are specific and historically significant:The Breakthrough: DeBitetto’s technique synthesized flat, white-light recordings (such as a model train or car going around a track) into a cylindrical or strip hologram, creating stop-motion or rotating 3D animations.Key Paper: He detailed his groundbreaking multiplexing technique in a 1969 paper titled Holographic Panoramic Stereograms Synthesized From White-Light Recordings.Legacy Display: Historical examples of his original reel-to-reel and cylindrical animated holograms are carefully preserved today in the MIT Museum.”

“The "King, Noll, and Berry hologram" refers to a pioneering 1970 paper that introduced one of the first methods for creating computer-generated holographic stereograms. By combining digital 3D computer animation with holographic techniques, the team laid early groundwork for modern 3D displays and visualizations.What It IsPublished in Applied Optics in February 1970, the paper titled "A New Approach to Computer-Generated Holography" was authored by Marvin C. King, A. Michael Noll, and Daniel H. Berry (all from Bell Telephone Laboratories).How Their Method WorkedGenerating Views: A computer was used to generate two-dimensional perspectives of a 3D object from various angles.Photographing: These perspective views were displayed on a screen and photographed sequentially onto a strip of movie film.Creating the Hologram: The film strip was then used to create a holographic stereogram using lasers, allowing viewers to see a continuous, 3D representation of the computer-generated object as they moved their eyes.Why It MattersBefore this breakthrough, computer holograms required immense computational power to process the complex mathematics of light diffraction directly. King, Noll, and Berry's method proved that you could bypass heavy computations by simply using many regular 2D perspectives and stitching them together holographically. This approach became the foundational basis for many holographic displays and stereograms used today.”

[whoiswei]

oh，thank you very much，but it looks very hard！

[whoiswei]

All the examples shown appear to be “horizontal parallax only” which implies H1/H2 system using sequential adjacent slit exposures of 2D image sequences for H1 and then projection of H1 master onto and H2 hologram of overlapped frames recorded in H1.

For further research by you, suggest starting with papers by Dominick Debitteto and King, Noll and Berry.

See below for summaries about them and their early work:

“Dominic DeBitetto is a pioneering physicist and researcher credited with developing the first holographic panoramic stereogram in 1969. Working at Philips Research Laboratories, he created a groundbreaking method to stitch multiple 2D photographs or frames together to produce a single, continuous, 3D animated hologram.His contributions to the field of optics are specific and historically significant:The Breakthrough: DeBitetto’s technique synthesized flat, white-light recordings (such as a model train or car going around a track) into a cylindrical or strip hologram, creating stop-motion or rotating 3D animations.Key Paper: He detailed his groundbreaking multiplexing technique in a 1969 paper titled Holographic Panoramic Stereograms Synthesized From White-Light Recordings.Legacy Display: Historical examples of his original reel-to-reel and cylindrical animated holograms are carefully preserved today in the MIT Museum.”

“The "King, Noll, and Berry hologram" refers to a pioneering 1970 paper that introduced one of the first methods for creating computer-generated holographic stereograms. By combining digital 3D computer animation with holographic techniques, the team laid early groundwork for modern 3D displays and visualizations.What It IsPublished in Applied Optics in February 1970, the paper titled "A New Approach to Computer-Generated Holography" was authored by Marvin C. King, A. Michael Noll, and Daniel H. Berry (all from Bell Telephone Laboratories).How Their Method WorkedGenerating Views: A computer was used to generate two-dimensional perspectives of a 3D object from various angles.Photographing: These perspective views were displayed on a screen and photographed sequentially onto a strip of movie film.Creating the Hologram: The film strip was then used to create a holographic stereogram using lasers, allowing viewers to see a continuous, 3D representation of the computer-generated object as they moved their eyes.Why It MattersBefore this breakthrough, computer holograms required immense computational power to process the complex mathematics of light diffraction directly. King, Noll, and Berry's method proved that you could bypass heavy computations by simply using many regular 2D perspectives and stitching them together holographically. This approach became the foundational basis for many holographic displays and stereograms used today.”

i think i must have a LCOS or DMD？

[jrburns47]

No. Suggest you find and read the previously recommended papers. You can also use LCoS and DMD SLM devices. Since you’re sophisticated enough to already know about those devices, you should be easily able to track down and read the papers and many many later papers. Start with the basics and build from there. There are many variations and possibilities now. Further study will lead you to the particular method you’d like to pursue based on the result you’d like to achieve. Good luck.

[whoiswei]

No. Suggest you find and read the previously recommended papers. You can also use LCoS and DMD SLM devices. Since you’re sophisticated enough to already know about those devices, you should be easily able to track down and read the papers and many many later papers. Start with the basics and build from there. There are many variations and possibilities now. Further study will lead you to the particular method you’d like to pursue based on the result you’d like to achieve. Good luck.

thank you very much