named after the German physicist Carl Pulfrich explaining the phenomenon in an article in 1922. It 'an optical illusion that occurs only when the light reaching one eye is more weakly than the other. A simultaneous stimulation of corresponding retinal points gives rise to a excitation
but after a short delay, the latency period, which is inversely proportional to the intensity of the stimulus. By varying the difference in light intensity, for example by putting a lens in front of a black eye, you get a different perception of the stimulus in latency, resulting stereoscopic illusion. An object moving in a plane parallel to the front of the observer seems then left the floor (the effectiveness of the effect is directly proportional to the speed of the scene). For example, if a pendulum is swung in normal moves back and forth on a plan, but in front of one eye is placed a dark lens, the pendulum suddenly seems to describe an elliptical orbit parallel to the floor. The Pulfrich effect has been applied for the production of television programs, including advertising clips. For example, Rai released a series of cartoons produced in Japan in 1978 ("Remi-his adventures" A 3D animated program based on the novel "Without Family" by Hector Malot - Animation Akio Sugino - Directed by Yutaka Fujioka) . The story in 51 episodes of 30 minutes each, is appropriate as the journey of the protagonist and his companions is full of movement. In general, however, only about third of each episode shows the three-dimensional effect, as not all scenes can be based on movement speed and direction suitable to achieve the effect. In fact, the use of this technique is limited by the fact that the subject or the camera, or both, shall move: there is no stereoscopic perception in the case of stationary images. Among the advantages of this technique: the ability to be deployed with the conventional TV channels, viewable on all types of screens and compatibility for users not interested in stereovision or without glasses, users can still follow the program in two-dimensional mode .
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