Stereo cinema is a term that has been around for a long time, sometime in the middle of the twentieth century, and the first patent application for filming a stereo film was filed in the late 1890s by William Freese-Green. However, the 3d format has received the greatest popularity in our days, due to its compactness and relative cheapness of use.
Instructions
Step 1
The essence of the 3d format is that the image is shot with two lenses and subsequently projected for each eye separately. The volume in our mind is perceived by the brain from the nerve signals of two eyes. If you can see with only one eye, the 3d format will not present any spectacle for you. There are several methods for conveying images in volume.
Step 2
The simplest and most common is anaglyph. The method consists in encoding the color with an offset into a specific color spectrum for each eye separately, for example, red and blue. Two pictures taken from different angles are projected simultaneously. The viewer wears anaglyph glasses with appropriate filters, while each of his eyes sees only part of the image. The disadvantages of this method are incomplete color rendition and strong light absorption by filters.
Step 3
Shutter method, or eclipse, light valve. The screen alternates between images for the left and right eyes. Change of images is carried out by synchronized sequential darkening of glasses, carried out with a high frequency. The inertia of visual perception creates the illusion of a three-dimensional image. Cons - the heaviness of the glasses, the effect of bifurcation of objects moving quickly, light absorption when the shutters are closed.
Step 4
Polarization method. Polarizing filters are used at 90 ° to each other. These filters are found in glasses and are worn on left and right eye projectors. A special silvered screen is applied. Only that part of the waves that is filtered by the lens on the glasses passes through the glasses for the left and right eyes. The polarization method is used in IMAX 3D technology.
Step 5
The Pulrich Effect is available for home use. It is not classified as a stereoscopic method, since it does not generate images for the left and right eyes. This effect is based on the delay of the nerve signal when the subject moves horizontally. You can use old sunglasses, remove the bottom of the lens and watch a regular 2d movie. When the camera or objects move, a three-dimensional effect will be created. 3d player filters that promise to make a regular movie look three-dimensional use the same principle. The image is slowed down for one or more frames, then converted to anaglyph or shutter method in real time. The disadvantage of the Pulrich effect is that static scenes do not create a three-dimensional effect.
