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Colour holography

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can this paper is also co-authored by have annulus Marius who is working with me here and he has done most of the work on the emotions and also on simulation on a color rendering and other things that I would refer to and if they stop with that then and yesterday when you
all when you went to the reception on Tuesday evening you sort of hollow-gram was several grams by knocking and 1 of them in particular was a blue loss or were wiped was viewed declaration had if you had a look at that hollow-gram as you know was created by the set colored technique but it represents what we need to achieve the in holography foreign direct recording the reason he's hollow-gram is so good and so low-noise easy on the use of red light the red laser light and then swelled and shrink the marginal create a shorter wavelengths and that creates an image that has the added value of knowledge because there has never been and is kept recording unit using blue light for example of course this process is very difficult and also it doesn't really have any direct relation to the color of the object he could as well instead of the blue declaration habit green in 1 and it would look equally similar so in this paper I am only talking about cultural programs that are actually recorded over an object and reproduce as whether cholera ending in as accurate as possible on what the goal is here that the human eye you should not see a difference between the object put behind a clean piece of glass and next week we put all of and then you ask people to say which 1 is the object which is all around when you get a 50 50 distribution of you have reached the goal OK so all of these other holograms that is not gave a very good presentation yesterday is of course very beautiful technique for artists to work but of course it's not really a and what we are looking at when we look at the recording holograms all of the objects in this category will of course also now include all of the generated holograms for example the ones that you even recorded with the ended a title for program input digital not into the hollow-gram when you're recording and then transferred digitally to obtain Cleckley's your level of completed computer-generated holograms for color of course in that case you can't say anything about color rendering because there is no war durable original object to compare it with so that is on the borderline of course but of course it's an extremely important applications and the technique if you look at the 1st holograms that were
recorded in the sixties and for example the left 1 here is the 1st transmission hologram it was actually a slide in 2 dimensions like recorded in all of them and the 1 on the New being is 1 of the example of color reflection or GM recorded in the Own 66 mid sixties and these of course a lot just to show that there is a possibility is the right 1 is only recorded with 2 colors red and green at In the beginning what we had was moral
grounds recorded and that's something we discussed before a multi-layered now but in the beginning there were no material except I committee gelatin that could report blue so what cobalt bloodied in 1986 most of combined a sly and I sensitive plate for radical order and the green and blue was recorded in the the CD player sound which they invent together get a fantastic high-quality hologram and that actually proved that color or if we can really be achieved but in this case it was in a sandwich gain very complicated technique to do it in the more direct way this probably is 1 of the best cultural grants recorded in the absence of that day and when a sluggish introduced to we
introduce the apart from acting emotionally was an experimental amounts and that I got from Solbourne and that the medium and the book a tree which we're working on it seems to us to and we did a lot of tests that to see if he can recording a single layer of quality all around and what we used was different test all but also this was the 1st object we recorded as you see that we actually put a blue background which is very rare that people make holograms and to prove or refute the use or is red or green background but we wanted to have a to shore and we wanted to have white In the hollow-gram sure that we could called these types of images TA in France has developed
an ultimately in emulsion which is also an extremely fine grained and here this is an emulsion that you can't buy and it's certainly he produce emulsion my monochrome emotions that he says but not really the high quality is color emotion and so that if used for himself to record hollow-gram like this which is also very high quality recording unfortunately tried to avoid to use and Hebrew or blue background so or white backgrounds he preferred to have primarily in red and green which would of course make a very nice looking ground so that's not the way
to what we need is to obtain a color or around 1st we need to look at what wavelengths to use 2nd what type of set up some it and what type of material and also what light source should be used to eliminate so these are the 4 factors all of them are extremely important and it yesterday and on on on Tuesday we discussed a lot of the bulk recording Mateus so I'm not going to cover that he had I refer to the previous paper by when he announced if you look at the laser wavelength
correlograms most programs on recording call the ones we make here we 3 wavelengths but what we did a few years ago was to create a computer program where we actually looked at what should the wavelength be and how many do we need and this was something that it when you don't know this it was my PhD student we are work with my best best all
that that's another thing that people use choreography seem to avoid to do even because they are not true if there were no grounds are would go not but definitely that is what the 1st person recording any color red should use this type of objects to start with their he'll have a saturated colors at the bottom of it and meet standards and black and white an straight down at the bottom we were running it with this program between 3
and 300 wavelengths and at some level located between 400 and 700 manometers and that's what we did is was that we wanted to see how many light sources are needed to minimize the edit and ever we make between a given patch on this so for example if the use for
example if the caller here that we measure in a certain type of right with the spectra for permitting get the x y coordinates in the chromaticity arrogant then we call this the same thing with the hologram and CP obtain exactly the same values and if you don't do that that is an error so the I would see a
slightly different color and of course this is nothing peculiar with holography it's therefore talk everything you even color photographs or not at all the together to test topic always have a problem with color reproduction in with what they feel that this graph that was a result of the simulation is set see that it's an exponentially declining curve which is the more wavelengths we the finer the the him and this more there will become but between 4 and 5 and what the source seems to be optimum recorded so we need fortified place arrangements to work and
issued the minimal color ending in error so 3 and invasive surveillance would never get the power effect and and recording and also
it's interesting to see that this is not generally don't again for wavelengths so if you look at these 2 with these and your
office here represent the the corresponding patch in in the test on so as you see it when we have 3 wavelengths we have a very knowledge and or in this 1 for patch very badly small in this 1 for example and the overlord or enter all this was what we were looking for when the problem that graph if you add in a 4th wavelengths you now see that the overall error is much it's more but we still could have some particular patch that this 1 is very badly reproduced and if you wanna like this these will eventually drop down to Seattle with the infinite amount of wavelengths or like a hundred or so probably here you can see another problem is the left 1 is is the
fault of taking the test all get eliminated we're RGB laser light and the right the right 1 is the corresponding color holograms uh the left 1 actually with the 3 wavelengths represent what the whole program should really look like the because of foreground only see these 3 wavelengths when you recorded up so this is also a different from the target itself so just put the topic in front of the laser wavelength so it doesn't look identical to have for example normalized like like or daylight on its own or the same salt problems we need to face most of our
test or the Dennis you recording technique of course it doesn't have to be because you can do transfer you can do a master and pop it into the 2nd order around but most of our of our using the then you because 1st of all you get 280 feet don't you in both dimensions and full parallax so if you are looking to make very realistic images that that's the way to war because as soon as the Mitch disappear if you don't see it from all directions then you know that this is not a realistic him not to realistically production of an object this is from our lab here at center for modern optics we have 2
rooms and 1 is the laser room here where we have the 3 places that combined the life the light from the sea laser with that nearest was shown in the other and maybe you need to see and so we have krypton and you remember that the
novel and they go through this being combined disease so that at 1st the radicals through and we have the green and we had the blue to white lace like the course into another room where we do the recording so here you see the white laser beam going through the hole
the war and here is on the other side where we have a huge table on which we call correlograms and here you can actually see where the our elephant test-marketed sitting with the white painted plate about invite then we have the will of course talk
little about computer-generated holograms it's not possible to generate a little money play it with the computer with the interference pattern that you need so mostly it is connected with either orographic stereograms or your have now the technique of generating audiograms pixel by pixel and train them as an example of both what the brain-imaging doing and the your technique that again you can look between transmission and reflection and transmission that can also be done with this techniques but as you know as soon as you move up and down the colors change which I don't think it is a technique of interest when you want to have absolute perfect color reproduction so that's where the reflection holography it is being used there as we have already
said that and I'm not going to talk about emotions not because that was the topic of the previous paper and other papers in this conference and these are the 3 year their potential materials for orography you encounter finding out the findings in the area for purported matter or dichromate gelatine who bought for example had done some excellent work also panchromatic commits that has been sensitize and so has yet blind and now I come to the light source we need to eliminate them and this
is not a cryptic and 4 cover around because you need to decide when you recall the all around what is going to be used to review it so the color temperature of the source has an influence on the color ending in the source I suppose determines they might images solution which is not unique to to work and they accounted for around its whole or GM but there is another interesting things here with the 3 reference angle which is not of importance to monochrome them but we need to get exactly the right angle that was used for recording the whole program assuming that is more stringent all swelling of dimension that means that we need to have that to get the right color reproduction for example if you have a color or many according to a more play like this it's goes from Greek and orange or red through right and then to reading so you need to be exactly at this angle you use what we are looking now is that we talked
about it yesterday and great news when also mention about fairly decent 1 that's another thing we are now investigating these type of sources for also to use for knowledge formant reflection or GM and all of you know what improvements we can get with this long lifetime and small size high durability and uh valiantly and energy use very Norway infrared or use the output in the being print out or heat that would destroy the whole program and all this but and also if we can actually match the 3 or 4 whatever we will be using for color or exactly these wavelengths in their immediate source so we just heat what has been recorded we use all of the extra noise that is created from the White halogen light when you heat all of the other part from the spectrum are heating the plate creating noise so where all of ground eliminated with a perfect match wavelengths from the energy with the recording would be extremely nice looking moral grounds and the people as of today that
looks in in them and I mean this is just the most important ones I think in that there are some others I'm sure that is not on this list that are also recording cultural grams of or even more and in a more consistent weight and all we of course which we have been for a long time color holographic even in the United Kingdom dining born in Japan has done a lot from for proponent your locals as you will hear in the next paper is heavily involved in it would have also paper from Institute of Technology becomes neuron and that the shogunate later today or this kind of and then we have the ultimate pyelography from strontium recorded holograms in France see brain imaging in the United States have been involved in a long time producing color holograms on 4 proportion material and then also related to your right is x y and z imaging in Canada is part of the development of all these C's not and printing machines and processing if you now look at C. that they have been working
with the DuPont for proportion and steel or I think but they may also have stopped looking at sea behavior for some applications they have it this is based on like to look at MIT long-term sometime ago when he developed this technique and you will probably have a lot about this in other presentations in some sales so hollowware papers have been presented on this technique so they make them normally enticed by 60 by 60 centimeters and then put them together to make a larger or around I don't know if that has changed or if that still is what they do on the screen to depends on how the knowledge format for proportionment point can and produces here's some examples of their book and
you may have seen a great brought some of these maps which of extremely nice and showing the view from from above all leaving for color when you actually have full parallax so you can walk around and look around you can even see different parts with different colors in the parking lot another example of that work was a portrait of Steve that was on display during the year and memorial off the back of a few years ago it have an united States hand color orographic in London arguing also the
primarily in the transmission of programs where they combined when they have done posters for movies and things like that and in this particular 1 I believe is from movies I don't know which 1 it is but it's 1 that you so they have had their mean movie theaters to promote move this and many other application in advertising died people on the Internet and Japan and has worked
exclusively on the must produce color around the poems from panchromatic emotions they have 2 different images 1 they call to image which is more for the day correct of and security image which is in the security business to make full color security holograms on 2 4 proportionment 1 example of that secure and more decorative or Moses watch from from the mean where they full hollow-gram all the dragon in the idea of the gold and red corrected watch and your of which you will hear in the next
paper and about this technique as you have seen when I don't know if you have seen here we have a room forcing the breaks you can come and look at that you have seen the hollow-gram at the entrance and many of the whole programs here so I'm not going to talk much about that or I will mention is that the gain the material is extremely important so you was forced to get to and develop a new field with finer grain and it is of course a which is developed and produced in in an outside Moscow and this film is that the ones you see here and of these hollow-gram we sure produced on that type of thing now we can talk about the future
of cultural reference so this is sort of what I see and I want like your input costs only if you think them right or wrong but 1st of all we need to find how many wavelengths we need and to see unfortunately we have not yet been able only cobalt track has done test and we therefore wavelengths the I have never seen a hologram recorded but it may only have been assimilation the other half an hour so we probably need to switch to wavelengths if we want to have that kind of production and eventually find and we know for sure if we are using the way that they have to be less than 10 meters and so that's something we have to continue to work on and the virtual color image kind of holographic plate that as of today it's represents the most realistic looking image on object that can be recorded to the only difference noise that you may get distortions because all the blurring from the spotlight which make them not exactly right you may also not have perfect color rendition In addition you may have some of the problems with the message and that would not look again to get to the object 1 thing I didn't mention but was mentioned by the paper is just food where they developed the computer simulation of adding 1 more wavelengths after the other to see what that depict has on the spectacle and of course the more images you protein and more recordings you do every time you will get an average of the speckle pattern so they would overlap slightly differently and eventually they will be arranged so in here what you may have seen in color or menu and holocene anymore area patterns order to see and it's strange things happening on the play so the more wavelengths we put in the mold clean the plate would look free of any new don't bring some or other things that happen often in a monochrome senior wavelengths recorded hologram and that of course if you stick to that issue correlogram for recording and objects and so them the extensive field of view and so of course there is illusion of looking at the real object so they from can actually recreate the light scattered from the object during the recording of the cultural program that when everything works well sport like the material the amount of wavelengths used so the conclusion with this technique
being perfected we think that it was directly recorded color had many applications in display unique and expensive artifacts of course also commercial and you say the point purchase display advertising learn windows of course whether they be more everything in the evening is of course 1 immediate possibility to social their products continuously in a window or sewing Appleton everyone else to go immediately put expensive stuff of that just whole grams because you are not allowed to touch anything any harm so why do you need anything at all objects and when you can get exact the same elution to the viewer outside the shopping window and a calorie a computer-generated hollow-gram will of course have an all or some very large impact on what is going to happen in particularly in the field of rapid product prototyping computer art and 3 D visualization since we can generate images of non produced objects that may in the future the them developed you can look at them in full D full color long before you produce and they look attractive or not and thank you for your attention
fj any questions and monuments you can do a lot of credit Is there a comment is a really this is a little anecdote from my when we 1st started voters work in Montreal a group of us what are looking at and wonder most of this we're all familiar with the situation we were looking at a whole different we notice that most of the way persons walking through the exhibit walk by the 2 Tavares around without a 2nd thought the we looked at the range of friends and all this wonderful was looking strangers over here there were enamored with the artifacts that we aware that we try to do is think about grammar was but was a whole granted regions that and that was kind of enlightening at time so to say that but we get out the less people will notice the process yes but I mean that's what you are after really I think so is that's what you are after really I mean if you look at the acoustic wave reproduction nobody would say that this sound reproduction of concept that you listened to at home is too would it looks set to really stick to its like you were sitting in the colonies that needs to look back it is on backs and reproduction I I don't believe that making it again and again that's absolutely the goal of all 3 imaging production techniques from the beginning of probably went into account of photography and so on so I think that it's just wrong to say that people would not like holograms there are identical to the object they no no I but I mean I know people sometimes say that what is the purpose of making a hologram entered into the object then you can say what is the purpose of listening to music if it's event to seeking a constant or only into it that's exactly the same moment anyhow that was a mark of the question you mentioned in earlier work done on the selection of the lines that those were very worst requirements 7 2 the 1st you've seen on the left yes yes yes we call it a cooperative you but all always look to very carefully both when he was the Cambridge for oxygen is MIT what what should be used with great work of yes the number in what I did he was peak a few things from the history if you read my other when I had the history of another papers I have already seen the list of references so they are another on my paper they can so we have just the comment on on wavelength selection and others suggests that if you pick the right equivalence point think that the way that might be sufficient and even better than more wavelengths and if if you look at the what terms fall into the following state very familiar with all of the seventies where he took what's that goal the 3 prime covers the 454 proteins extent he found that the color rendering from those 3 was better than any other set of wavelengths even if you have a continuous spectrum you and so I had if you have an extra for example for a data actually reduces to the it maybe if you pick just the right 3 wavelengths yes but that assuming that you have more broadband wavelengths and hassling OK not only Hesselink sure that you could be 3 wavelengths that sometimes it was and from our simulation with 3 we could get 1 of these patches completely wrong and if that was to reduce all of them I don't see it we can also at it when you're lost if you have any comment on that because you did all of the simulations but anyhow I think it we may discuss this later because we have to work I think it and did you have a question or not mission and I'm going to no I remind you you can have work I think so the current use the mind because when you are looking at things during the day when the sun is going to morning on the afternoon if you use much better than when it's fine so I mean the problem of renderings of color he's a very complex because you taken object and you don't seem the same in a room with an outside business and when it's also cloudy so it's very complex slicing who gave a very good that's could could use this is so much from the obvious of course are made the problem is the coherence length of each of them is maybe not the same as the next 1 so this was the case this laser of to the clearance sense was not very deep enough you need also along coherence of course I would think the most obvious killer applications workbenches regression work and we you would like to take this given that we have not really looked at you have seen something I mean what has been done and foreign like by and see that for example our pockets that's what we get but if you look at a monthly graph of like my pocket There is a huge difference in color rendering when you have an infinite amount of like the full spectrum so you have to rendering the color of the human flesh on the skin is very very difficult it's very complex I think we can only take 1 more question from and then we I want to go over to you I would also like impressed by excellent results so it'll column vector but I believe this is is purely from the students who is saying about a company is around the world and this different results yes yes of course anyhow I think we have to proceed now and there will be more question of uh David updates paper which is related to this so that we can take more questions like that so please let me and and we were
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Metadaten

Formale Metadaten

Titel Colour holography
Untertitel state-of-the-art
Serientitel 7th International Symposium on Display Holography (ISDH 2006)
Teil 44
Anzahl der Teile 61
Autor Bjelkhagen, Hans I.
Mirlis, Evangelos
Lizenz CC-Namensnennung 3.0 Unported:
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DOI 10.5446/21303
Herausgeber River Valley TV
Erscheinungsjahr 2012
Sprache Englisch

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Fachgebiet Informatik
Abstract The state of the art of colour holography is presented. The laser wavelength selection issue is investigated through computer simulation, showing that more than three wavelengths are needed for accurate colour rendition in holograms. In addition, the recording material is very important for creating high-quality colour holograms. The demand on the material and suitable products currently on the market are covered. The future of colour holography is highly dependent on the availability o improved panchromatic recording materials. Recording colour holograms, either directly or by computer, as well as digital printing of such holograms are mentioned. The light sources for displaying the holograms are important. Small laser diodes as well as powerful white LEDs and OLEDs with very limited source diameters are important for colour holography to improve image quality over today’s commonly used halogen lights.

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