3D Visualization Techniques

3D Visualization techniques Introduction - where does it come from

3D visualization technique is an integrated modern technique created in the mid 1980s, consisting of computer data processing and image display. From the very beginning, it was just an image display tool to describe and explain underground geological phenomena. As the development of science and technology, 3D visualization techniques are used more and more frequently in our daily life. It covers business, medicine, entertainment and so many other different kind of industry. With the progress of the time, there is no doubt that 3D visualization technique is bringing significant influence to our current and future life. Introduction - How could 3D objects be

As we noticed, in the real world, your eyes are spaced apart so each one of them has its own view which is in a slightly different position from one another. Since your eyes are about five to seven centimeters apart, they would probably see the same view from slightly different angles. Then your brain tries to put the two pictures together to form one 3D image which has depth to it. This is called binocular vision. Therefore, when you are trying to visualize 3D pictures or movies you need to first shoot those two pictures like your eyes see them and then present them to your eyes and brain. This is also how filmmaker produces a 3D movie. Nowadays, we enable 3D visualization to be worked basically by two different methods, 3D glass and Autostereoscopy, also known as “glasses - free 3D”

Glasses-free will be the future of 3D technology. But due to limitation of Glasses-free 3D technologies (since a particular and precise viewing point is needed to see the 3D image properly), so far we are using and developing 3D glasses which is the mainstream technique to capture the 3D image. In other words, the 3D glasses are the most effective way to visualize 3D objects

Thus, the 3D glasses are needed to filter the two images obtained from the screen display and make one of the images goes to the left eye and the other enter the right eye. When the display device outputs a left eye’s image, left eye lens is in transparent state while right eye lens is in opaque state. Vice versa, when the display device outputs a right eye’s image, right eye lens is in transparent state while left eye lens is in opaque state. Therefore, our eyes will capture images with slight differences respectively by such high-frequency switching.
In such way, it helps our brain to merge the two different images to make the movie or TV show we are watching just like a 3D scene which is happening right in front of us.

As far as I’ve researched, there are two major techniques classes for 3D glasses which are passive and active.

Passive Glasses

Passive 3D glasses are those glasses that do not need a power source to view 3D content. There are two main types passive glasses: Anaglyph & Polarized Glasses.
Pros of passive glasses are that it is inexpensive and cons of it is that it can have some loss in picture quality as compared to active glasses.

*Anaglyph