Images in films, TV shows, and videos are often displayed in two dimensions, width, and height, which might feel restrictive. The use of 3D technology becomes useful here. Various 3D picture technologies call for specialized eyewear. A decoder is built into the TV or projector and translates the specific 3D encoding, as different methods transmit 3D signals to the display device.
The screen delivers left and right eye data independently whenever a 3D image is displayed. These images blend on the screen, and the end effect is a slightly fuzzy picture requiring special glasses to decipher.
Stereoscopy is a technological method of seeing three-dimensional images that uses two cameras to represent our eyes. Photographs of the same object taken from slightly different perspectives could be viewed using this technique in three dimensions. The brain is tricked into perceiving two separate images as a single one by the 3D glasses’ left and right lenses, which perform different functions. The result is a three-dimensional mental representation.
Anaglyph 3D glasses are the most easily recognizable because of the red and blue color contrast between the glasses’ lenses. They are the first generation of this technology. Their lenses block blue and red light as they commonly have cardboard or paper frames.
Both eyes perceive different images. If you use a red lens, you’ll see white and black more clearly, and vice versa if you wear a blue lens. In doing so, the brain is tricked into perceiving the two images as a single, three-dimensional object, including depth.
Polarized (Passive 3D Technology)
These glasses are the standard in most movie theatres. They have tinted lenses and typically come in cardboard or plastic frames. They function similarly to polarized sunglasses by limiting the light reaching your eyes. One lens lets in light from the top and bottom, producing depth perception. The other lets in light from the side, giving you a sense of movement, which is the 3D effect.
Horizontal and vertical light wave orientation filters, as well as clockwise and counterclockwise filters, are used in this eyewear. Two projectors often aim at the same screen to create a stereo image, causing the images to overlap. The polarized filters built into the glasses’ lenses ensure that each viewer sees just the light rays from a single projector.
Even though both images are superimposed on the same display, each eye sees only one at a time. The polarized lenses in the glasses are designed to filter out duplicate images by ensuring that the light waves flowing through them are at specific angles.
Shutter (Active 3D Technology)
The advanced technological components of these shutter 3D glasses must be charged or powered between usage. The eyewear includes a transmitter, an on/off switch, and fast-rotating shutters on each lens. Together, the functions keep the quickly rotating shutters in time with the tempo of the screen display.
When the images for each eye are synchronized sequentially with the screen’s refresh rate, the resulting 3D image has the exact resolution as a 2D image. In contrast to a polarized frame, which only shows half the image to each eye, non-polarized frames entirely show the image.