3 D Television – How Does It Really Work Part 2
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Continuing the first part of this explanation article set, the 3D concept can be very easily put into practice by using a movie shot frame by frame from two different angles and during the replay the images are interpolated and the eyes ( if 3D glasses are not used ) see a doubled image. If the refresh rate is too low you may even see the image shifting in real time (low frame rate).
Unfortunately, when filming with a bi-dimensional camera, the focus point does not match the one in real life and combined with the fact that I explained previously someone who wants to watch a 3D movie needs to wear 3D glasses.
Because of the fact that during the projection the actual perceived screen is actually further than the real image. Because of this some people experience headaches when watching 3D movies without the glasses.
In what regards 3D glasses these can be of two kinds: passive and active. Some of the first active 3D glasses models were marketed by Panasonic and these 3D active glasses have different colored lenses, but use liquid crystal technology ( LCD ) to communicate wirelessly with your 3D TV or display. The image displayed on the screen alternates between two sets of the same image ( from two different angles as states previously ) given the fact that their refresh rate is very high. Depending on the content, each eye sees only one set of images, so viewing the content with both eyes creates the impression of depth and immersive multimedia experience.
The other type of 3D glasses is the passive type and these 3D passive stereoscopic glasses have the lenses colored in basic colors: one lens is red and one blue. Through them, each eye sees a single image due to the visual filter, but the brain will interpret that the eyes are looking at the same object. That means the mind is tricked and actually the eyes converge at a point different from the real focal point of the image so this creates a sense of depth.
Follow me in this extensive set of the 3D technology presentation if you want to understand why it’s such a hit on the market and why many people look into buying a 3 D television set rather than a regular bi-dimensional TV.
Read the next part which explains the roots of the 3D technology and early basis on which it took shape.