How Vivid 3D Image Made
Ed - What is the principle of 3D movie?
Three-dimension (3D) technology has become a big issue. Avatar took the box office crown with vivid 3D imaging, and Samsung has recently launched a new LED 3D television. The Hyowon Herald interviewed Lee Sang Yong, CEO of Analogue & Digital 3D, the only company in Korea which produces all the 3D making tools and films 3D videos.
When we see an object, each eye is located in different positions from the object. So, the image on the left eye’s retina differs from the image on the right retina. Our brains analyze the two other images and perceive the object as three-dimensional. So, filmmakers take two images, the left one and the right one. Viewers wear special 3D glasses so that the left eye can see the left image and the right eye sees the other. Also, there are 3D TV monitors which already contain the functions of 3D glasses. We will just cover the two types of glasses viewers wear in a theater.
Polarized glasses are what you wear at normal theaters like CGV. Light is composed of electromagnetic waves. It oscillates in all directions. But if light gets through a polarizer, it starts oscillating in a particular direction. The lenses of polarized glasses are the same as polarizers. Each lens has a different polarization direction; they are 90 degrees different. So, the left image is supposed to pass through the left lens, while the right image can’t go behind the left lens.
Liquid crystal shutter glasses are for the theaters like I-max. While the left lens is shut off, the right one opens in order to blocks the right image. The same applies to the right lens. Each lens repeats to shut down and open alternately. It happens at high speed. Each lens shows 60 frames of images per second. Accordingly, a display or a TV monitor sends 120 frames of images per second so that you can perceive the picture as 3 dimensional.
Some viewers feel dizzy and even have an urge to vomit when watching a movie. Mr. Lee said, “To prevent it, producers have to consider the human factor seriously, which affects the human body.” He added, “I can hardly say that Avatar’s 3D technology is perfect though it’s a great movie. Some viewers might feel uncomfortable at some scenes due to the technical defects. Also, a few scenes couldn’t express the sense of depth and space, because the distance between 3D cameras was not correctly measured.”
The CEO said about the prospect for the 3D industry, “Extremely high 3D technology is to attract more and more interest from this year. Already, the 3D market has widely expanded in the U.S, Japan and Europe. There’s no industry that does not use computers now. Only 25 years have passed since the 8-bit personal computer first launched. Likewise, 3D picture must be used in all industrial areas in the near future.”
By Lee Shin-ae, Reporter