How could something like this slip under the radar.
The technology behind this performance is shrouded in secret for the time being, but presents a step in 3D technology that should be of interest to all.
[youtube]http://www.youtube.com/watch?v=l9yFYmboERs&feature=player_detailpage#t=23s[/youtube]
3D Hologram (caution Language)
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It is only a projection onto a flat transparent screen. Nothing new. 3M is making those screens for decades.
Well Refracty - it appears to be 3 screens from 3 angles or something. If you watch the video you can see it clearly is not just one projection, as it doesn't look skewed when viewed from the side.
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Hmmm
It's skewed when eye isn't perpendicular to the stage (see at ~3'53).
As said Refracty it's just old good Pepper's ghost technique that exists since 1860.
You also could have seen this some years ago during MTV awards where Gorillaz people were replaced by their characters animated by ILM (if I well remember).
So, nothing new. The glasses and projectors are just better than before...
F
It's skewed when eye isn't perpendicular to the stage (see at ~3'53).
As said Refracty it's just old good Pepper's ghost technique that exists since 1860.
You also could have seen this some years ago during MTV awards where Gorillaz people were replaced by their characters animated by ILM (if I well remember).
So, nothing new. The glasses and projectors are just better than before...
F
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In fact, it can't be named hologram. I have studied a lot most of 3D/Stereo viewing technics, and in the state of the science, it is not possible to project an actual hologram. An hologram is not a slide. There are many reasons for that. Everyone must be conscious that there is no way of making an holographic camera (Digital or optical).
Some so called "holographic cameras" are in fact special experimental systems using a classical camera mounted on a moving support controlled by a computer, allowing to catch holographic images of particles in a very small volume of fluid (around 1 cubical mm).
An actual hologram is a photo made on a special photographic film having both high resolution (very small grain) and a thick emulsion layer.
In the thickness of the film (not on the surface, unlike regular films) are caught interference fringes caused by two enlarged laser beams coming from a unique coherent source that has been split in two.
One of the beams is directly casted on the film plane and the other one is reflected on the object that will be holographed and then casted after reflection on the film.
Each point of the film (row of points in the thickness of the film in fact) contains in the interferences fringes the image of the whole object seen from a different angle.
The whole holographic system is set up on a heavy anti-vibration table in an laboratory insulated from noise and vibration. It is usually underground and not in city. A vibration of the surrounding air or the table of 1/4 of the wavelength of the laser is enough to disturb the system and blur the hologram !
The laser is controlled by remote control and nobody is allowed in the room 10-20 minutes before the start of the hologram capture !
No living creatures can be holographed.
Due to the conditions involved, only static objects measuring less than 20 cm can be "easily" holographed. Bigger objects require powerful lasers.
An hologram catches the geometrical characteristics of an object. The actual colors can't be captured, even with 3 RGB lasers. Due to the required mount precision inferior at wavelength level, it wouldn't be possible to create a device to recompose the 3 images.
Due to the principle involved, the hologram support can't be duplicated at identical. It is possible to make an holographic copy of an hologram (hologram of an hologram), but the target hologram will be always smaller than the original.
As the only support of an hologram is a special photographic film, it is not possible to create an holographic screen. When looking at an hologram, the screen is in fact the film itself. Usual holograms are rarely bigger than 20 cm x 20cm, and you look directly at them while a monochromatic light is projected behind the film plane. The image seen can appear in front of the film surface, or behind. It depends on the optical method used at capture (location of mirrors relatively to the object and film plane).
The image can't be seen outside the area of the film. In fact you see a 3D image on a 2D surface. There are transmission and reflection holograms. According to the capture method used, it is like looking through a window or in a mirror.
An electronic holographic screen would have to be composed of thousands of layers of LCD or similar of around 10 nm of thickness each and a digital record file of an hologram would weight thousands of GB per image !
Same thing for the capture. As the support must have characteristics of a thick holographic film, there is no way of creating an holographic sensor.
Currently, it is technically possible to compute an hologram from a Computer Graphic image, but the resulting file has no possible application.
So, even if it was possible to capture it, an holographic movie couldn't be transported on any existing channel (not even fiber optics). Downloading an holographic movie of 1 hour in HD, could require one year on a 100 MB/s fiber optic internet connection, and storing one film would probably require a hard disk as big as a car !
So, simple stereoscopic images requiring only two images for left and right eyes are much more efficient and economical.
Soon auto stereoscopic screens made of microprisms could allow watching movies without glasses in good quality. There are already few TV sets on this principle , but the current resolution is divided by two (half per eye) compared to a 2D HD image, the distance from the screen is critical and the angle of view is narrow.
Holographic projection will probably stay for ever in the domain of Special Visual Effects in sci-fi movies !
By the way : this topic would have a better place in Off Topic section, I think.
Some so called "holographic cameras" are in fact special experimental systems using a classical camera mounted on a moving support controlled by a computer, allowing to catch holographic images of particles in a very small volume of fluid (around 1 cubical mm).
An actual hologram is a photo made on a special photographic film having both high resolution (very small grain) and a thick emulsion layer.
In the thickness of the film (not on the surface, unlike regular films) are caught interference fringes caused by two enlarged laser beams coming from a unique coherent source that has been split in two.
One of the beams is directly casted on the film plane and the other one is reflected on the object that will be holographed and then casted after reflection on the film.
Each point of the film (row of points in the thickness of the film in fact) contains in the interferences fringes the image of the whole object seen from a different angle.
The whole holographic system is set up on a heavy anti-vibration table in an laboratory insulated from noise and vibration. It is usually underground and not in city. A vibration of the surrounding air or the table of 1/4 of the wavelength of the laser is enough to disturb the system and blur the hologram !
The laser is controlled by remote control and nobody is allowed in the room 10-20 minutes before the start of the hologram capture !
No living creatures can be holographed.
Due to the conditions involved, only static objects measuring less than 20 cm can be "easily" holographed. Bigger objects require powerful lasers.
An hologram catches the geometrical characteristics of an object. The actual colors can't be captured, even with 3 RGB lasers. Due to the required mount precision inferior at wavelength level, it wouldn't be possible to create a device to recompose the 3 images.
Due to the principle involved, the hologram support can't be duplicated at identical. It is possible to make an holographic copy of an hologram (hologram of an hologram), but the target hologram will be always smaller than the original.
As the only support of an hologram is a special photographic film, it is not possible to create an holographic screen. When looking at an hologram, the screen is in fact the film itself. Usual holograms are rarely bigger than 20 cm x 20cm, and you look directly at them while a monochromatic light is projected behind the film plane. The image seen can appear in front of the film surface, or behind. It depends on the optical method used at capture (location of mirrors relatively to the object and film plane).
The image can't be seen outside the area of the film. In fact you see a 3D image on a 2D surface. There are transmission and reflection holograms. According to the capture method used, it is like looking through a window or in a mirror.
An electronic holographic screen would have to be composed of thousands of layers of LCD or similar of around 10 nm of thickness each and a digital record file of an hologram would weight thousands of GB per image !
Same thing for the capture. As the support must have characteristics of a thick holographic film, there is no way of creating an holographic sensor.
Currently, it is technically possible to compute an hologram from a Computer Graphic image, but the resulting file has no possible application.
So, even if it was possible to capture it, an holographic movie couldn't be transported on any existing channel (not even fiber optics). Downloading an holographic movie of 1 hour in HD, could require one year on a 100 MB/s fiber optic internet connection, and storing one film would probably require a hard disk as big as a car !
So, simple stereoscopic images requiring only two images for left and right eyes are much more efficient and economical.
Soon auto stereoscopic screens made of microprisms could allow watching movies without glasses in good quality. There are already few TV sets on this principle , but the current resolution is divided by two (half per eye) compared to a 2D HD image, the distance from the screen is critical and the angle of view is narrow.
Holographic projection will probably stay for ever in the domain of Special Visual Effects in sci-fi movies !
By the way : this topic would have a better place in Off Topic section, I think.
French Blender user - CPU : intel Quad QX9650 at 3GHz - 8GB of RAM - Windows 7 Pro 64 bits. Display GPU : GeForce GTX 480 (2 Samsung 2443BW-1920x1600 monitors). External GPUs : two EVGA GTX 580 3GB in a Cubix GPU-Xpander Pro 2. NVidia Driver : 368.22.
And that would be the end of "piracy" in the movie bussines, run major corps, you need to set HOLO-DVD as the new standard! (well, it's worth a try ;P )ROUBAL wrote:So, even if it was possible to capture it, an holographic movie couldn't be transported on any existing channel (not even fiber optics). Downloading an holographic movie of 1 hour in HD, could require one year on a 100 MB/s fiber optic internet connection, and storing one film would probably require a hard disk as big as a car !
Totally awesome explanation mate, and too sad we are not going to grow in the future we were shown when we were kids (althou I love our current future and its toys, lol )
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Thanks for your comment Kubo ! Yes, current tools are cool too !
One more thing about holograms. As it is possible to compute an hologram from a computer generated image, one could imagine in theory using a 3D printer printing layer after layer the equivalent content of the depth (thickness) of a chemical holographic emulsion. The problem is that the 3D printer would have to reach a resolution of 5-10 nanometers per dot in X,Y and Z ! A such precision in mechanical machines will never be reached, as it is very inferior to the simple deformation of any parts of the machine due to gravity, inertia and temperature variations !
Added to that, creating a translucent Ink able to produce droplets around 5-10 nm with enough fluidity but not evaporating instantly on the printer head for this kind of application would be an other huge problem !
Do you know that it is possible to see almost any film or TV program in 3D on your ordinary TV set ?
It works only on moving scenes, and at better where there is a transversal travelling in the image. You only need glasses with one unique grey glass. Old sun glasses with a removed glass can do the trick !
It is due to the "Pulfrich effect". The capture of the image by the eyes is an electro chemical process. Some cells of the retina generate continuously some light sensitive pigments that are destroyed by the light. Some other cells (sensitive cells) continuously measure the amount of remaining pigment and transmit the information to the brain through the optical nerve.
The cells of the eye receiving less light regenerates faster the pigment and the cells measuring the amount of pigment and converting it in the visual information work faster than on the more lighten side.
This creates a time shift between informations coming from each eye. On moving scene, this time shift represents also a slightly different location in space of moving object.
So, the brain sees two different images, almost like when viewing an ordinary 3D scene. The brain operates the fusion and gives the same perception as a streoscopic scene.
Before breaking your sun glasses, you can also experiment by putting a piece of cardboad close to one eye (generally the right eye if it is your "director" eye) having a small hole (1-3 mm) punched in it, it will act like an iris to reduce the input light.
For example, look at a movie with large travelling, like the space battle at the beginning of Star Wars (episode 3, I think).
One more thing about holograms. As it is possible to compute an hologram from a computer generated image, one could imagine in theory using a 3D printer printing layer after layer the equivalent content of the depth (thickness) of a chemical holographic emulsion. The problem is that the 3D printer would have to reach a resolution of 5-10 nanometers per dot in X,Y and Z ! A such precision in mechanical machines will never be reached, as it is very inferior to the simple deformation of any parts of the machine due to gravity, inertia and temperature variations !Added to that, creating a translucent Ink able to produce droplets around 5-10 nm with enough fluidity but not evaporating instantly on the printer head for this kind of application would be an other huge problem !
Do you know that it is possible to see almost any film or TV program in 3D on your ordinary TV set ?It works only on moving scenes, and at better where there is a transversal travelling in the image. You only need glasses with one unique grey glass. Old sun glasses with a removed glass can do the trick !
It is due to the "Pulfrich effect". The capture of the image by the eyes is an electro chemical process. Some cells of the retina generate continuously some light sensitive pigments that are destroyed by the light. Some other cells (sensitive cells) continuously measure the amount of remaining pigment and transmit the information to the brain through the optical nerve.
The cells of the eye receiving less light regenerates faster the pigment and the cells measuring the amount of pigment and converting it in the visual information work faster than on the more lighten side.
This creates a time shift between informations coming from each eye. On moving scene, this time shift represents also a slightly different location in space of moving object.
So, the brain sees two different images, almost like when viewing an ordinary 3D scene. The brain operates the fusion and gives the same perception as a streoscopic scene.
Before breaking your sun glasses, you can also experiment by putting a piece of cardboad close to one eye (generally the right eye if it is your "director" eye) having a small hole (1-3 mm) punched in it, it will act like an iris to reduce the input light.
For example, look at a movie with large travelling, like the space battle at the beginning of Star Wars (episode 3, I think).
French Blender user - CPU : intel Quad QX9650 at 3GHz - 8GB of RAM - Windows 7 Pro 64 bits. Display GPU : GeForce GTX 480 (2 Samsung 2443BW-1920x1600 monitors). External GPUs : two EVGA GTX 580 3GB in a Cubix GPU-Xpander Pro 2. NVidia Driver : 368.22.