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Introduction to 3D Technology
It seems that the whole world is talking about 3D this year, although half of them think that 3D died before it started, and the other half know very well that 3D is just the next step. in the development of digital video viewing. In fact, most of the so-called amazing new 3D technologies have been around for 20 years or more. Let’s take a look at the 3 main types of 3D displays out there so you know what they’re trying to sell you at your local electronics store the next time you upgrade your TV.
But first, what on earth is 3D and why does it matter?
3D is how humans see the world around them – although you should know that not being able to see in 3D is a very common disability among many adults. If you think you see the world around you in 3D, how can you produce and reproduce something in 3D, such as a movie or a video game?
Being able to see in 3D means that your vision has a sense of depth, the distance of objects to your eyes. Your brain calculates this for you by combining the images it receives from your left and right eyes, and models the small differences that occur when you look at things from different angles. You see what I mean by holding a finger in front of your eyes and looking up. Close one eye, open and close the other. Do it quickly and you will see the difference between each one. Your finger is in a completely different position in each eye, but your brain combines the two and indicates that this means that your finger is close to you.
Making a 3D movie is as simple as using two cameras, which are aligned with each other at the same distance as the human eye. Each captures a slightly different record, which when returned to the human brain can show you not only the visual scene but the depth of everything you see. If the movie was shot on a computer, it’s easy to make it 3D because you only have to redraw all the data in a slightly different dimension. If a film is shot with 3D in mind from the start – like Avatar – the results are spectacular.
3D games are very easy to make, because all the data needed to identify the position of each object in 3D space is kept on the computer and can be processed in real time. In fact, many of us played PC games in 3D almost 10 years ago, and the technology is the same as that of 3DTV and cinema today.
If you think you have 3D data, whether it’s a movie, animation, or video game – the problem is how to present it to the viewer. Here’s the technology side we’re going to talk about today.
Before I explain some of this though, let me say that I’m not going to talk about those fuzzy red/blue glasses you get on cheap old 3D DVDs and comics, because it’s not true 3D and the quality is bad – well separated. then everything you see is red and blue!
All of these 3D technologies come up with a way to get that slightly different image for each eye – the other eye can’t see it either. Because conventional TVs show the same image to both eyes no matter what you do, 3D is not possible on them. This is why you will have to get a new TV if you are going to watch any type of 3D device.
But how can we present a unique image to each eye?
1. Passive polarized glasses:
Polarization means that light rays point in only one direction. In general, as it comes to us pointing in different directions. A polarizing filter allows light from only one direction. They are generally used in photography to prevent reflections – for example, if you tried to take a picture of a window, you wouldn’t be able to see the other side because the light would bounce off your lens. With the Polarizing filter, you can cut it, and can see everything on the other side of the window.
The unique and useful properties of polarizing filters mean that by combining 2 filters, we can make a kind of dimmer switch for light. If you take two pieces of polarizing film (think high school science class now), and rotate them slowly, at one point they will let most of the light in and at another point otherwise it will leave zero light. This is because in the first case the direction of the light is aligned with the first filter than is allowed to pass through the next filter. However, when you rotate the second filter, you do so slowly so that no incident light can pass through and reach your eyes.
When it comes to 3D technology, however, the ability to filter specific light rays to be visible or invisible to each eye means that we can provide a single image to each eye at the same time. How? We have two images on the TV side, and each can be combined in a different direction. Then we add the same filter as the light glasses, and each eye will see only the light that comes from a particular direction.
This is the easiest way to do 3D, and it’s not perfect. It is used in large 3D cinemas where the quality of the film is less important than the experience, and maybe not very long films – like in Disney World, for example. The first advantage is that the glasses are light and the manufacturing process is very simple, so it doesn’t matter if people break them or ‘misplace’ them.
There are cheaper 3DTVs produced this year for the budget market, but I recommend you stay away from them. You often have a lot of blur between images (so you can see left and right at once), and you really need to be in a dark room to get the best of this type of 3D. Dolby also has a proprietary system that seems to produce better quality than standard filters, and is used in better 3D cinema.
2. Active LCD Shutter Glasses:
This is the best 3D you can get right now, and anyone who has ever wondered about the beauty of Avatar probably went to see it using this technology. Active LCD shutter means the viewer has to wear a lot of glasses – each eye has a separate LCD screen inside, as well as an infrared signal receiver that connects it to the movie being played. Unlike passive polarization which only shows two images on the screen at once, the active shutter mode shows one image, alternating between the dedicated view for the left and right eyes. The LCDs in the glasses turn on and off in sync, blocking one eye then the other. It happens so fast that your brain just merges the two images and forgets the other 50% part where each eye can’t see anything.
The advantage of this method is that the quality is very good and there is almost no “bleed” from one image to another. Unfortunately, some people say it causes headaches. In all my years of playing games with active LCD shutter glasses from NVidia, I’ve never had a headache, so I suspect the problem might just be something you’re used to. When television first came out, I suspect there were similar complaints from a large portion of the population.
This will be the consumer 3D platform of choice for years to come. Yes, the glasses are annoying, but then we won’t be watching everything in 3D. When I sit in front of my PC to play games in 3D, for example, I barely notice them. The latest arrival of LCD shutter glasses from NVidia is very light, wireless, and recharges from a small USB socket. The giant models you get in high-end 3D cinemas are no longer thicker than old technology, but to make them more resistant to wear and tear and discourage you from taking them home. If you’re really against wearing glasses to watch 3D content – well, you’ll be waiting a long time. Which brings us to method 3.
3. Parallax display:
Parallax 3D display shows 3D content without using glasses. Although there are many competing technologies and rapid development as we speak, the basic principle is that both images are displayed on the screen, then some sort of filter moves the images in different directions. When viewed from the other side, you can see the 3D effect. Most offer 6 different viewing angles, but outside of these you’ll lose the 3D effect and just see two blurry images.
It’s a relatively new technology, and was first shown last year in the form of Fujifilm’s first consumer 3D camera, which I got to play with. The camera captured 3D images, and those images could be viewed and replayed with a pair of small 3D glasses—no screen behind. This year, the Nintendo 3DS will use a similar but slightly refined version of the same technology to bring portable 3D gaming to the masses.
My experience with the Parallax display was less than impressive. First, it’s just annoying to keep your head in a fixed position. Especially if you’re looking at something in 3D, your head has a natural tendency to move around and want to see it from different angles. Also, the depth you can see in any of these shows is pretty bad. It doesn’t really “pop” at you, even if it looks like 3D. I haven’t seen the 3DS yet though, so I won’t comment on it until it comes out. In any case, this type of 3D won’t be coming to a large 3DTV anytime soon, or maybe even soon.
I hope to give you some insight into this new technology. Don’t forget to check out our other technical tutorials.
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