Many of us at least once in your life go to the cinema to watch 3D-film, and it is likely experiencing some discomfort while – headache, eye pain, heaviness in the forehead area. According to statistics, these problems are not uncommon. In 2011, the French researchers conducted a survey, trying to understand how people feel after watching of 3D-films. It was found that
Only one-third of the audience watching these movies, without experiencing any problems, 27% feel “discomfort”, 22% complain about the deterioration of health, 7% experienced severe headaches pain,
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the remaining 11% is also noted worsening symptoms well-being, but for other reasons.
This headache is a brain response to the “wrong” image, while coming in both eyes. To the viewer saw the picture in the volume you need to right and left eyes, looking at the screen, see different images, and the brain must combine them to get the stereo. This helps the brain special glasses, which are issued by the audience at the entrance to the cinema. The operating principle of these points depend on the manner in which the film was produced. Surround effect can be achieved by using different (for the right and left eye) color-coded images, alternately display images on the screen with a very high frequency, as well as through the use of linear polarization – that it is used in IMAX 3D technology
<. p> However, to successfully combine two images in the brain does not always work – in this case the person and headache begins
the research team led by a senior researcher. employee of MSU computer graphics lab Dmitry Vatolina more than eight years has been studying the problem of headache that occurs after viewing of 3D-films. In mid-February, the results of this study, the researchers told a held in San Francisco the 27th annual conference of the Stereoscopic Displays & amp; Applications , one of the world’s most prestigious conferences on this theme
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The researchers grouped the causes that lead to headaches (a total of more than 15), in two categories. The first category is primarily due to the natural tendency of owners to reduce costs, which inevitably leads to a reduction stereopokazov quality. Bad points, cheap projectors and other equipment of inadequate quality drastically reduce the quality of the film itself.
The reasons for the second category are more complex, diverse and yet, unfortunately, are not always available to fix or avoid. Among them, the most painful for the audience (but, fortunately, one of the most rare) “puncture» –
entangling the left and right video signals, it sometimes happens during installation even professionally made movies.
Scientists have developed a special software – metric – allows you to track these types of problems, while minimizing technical control while the quality of movies. Using this metric, the research team scanned almost all video products, manufactured in the Blue-ray-drives, and made statistics of these problems. Total using 105 metric stereodiskov Blu-ray, with 23 films of 65 has been found problematic scenes were analyzed. So, similar incidents of mixing up angles have been found even in top-rated movies like “Avatar,” “The Chronicles of Narnia”, “Stalingrad” and other
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«It means, – says Dmitry Vatolin – when buying a 3D-movie on Blu-ray-drive with you probability 21% buy the film, which will have at least one scene with the problem of tangled angles. For sensitive people it is already noticeable. ”
A large number of these and other problems, according to Vatolin, was found in horror films, because of the small budgets of these films. “Stereofilms now going through a transitional period, – the scientist says. – Film producers are beginning to prefer the stereo, it has become particularly widespread phenomenon of “Avatar” after a stunning financial success. And, of course, the quality of the films and theater equipment quality improves over time, and now the quality is higher on average than it was in “Avatar”, but a significant reduction in the problems may take another two or three years. And if you want high-quality 3D now, choose high-budget movies and rooms with expensive equipment. I wish all the less headache! »
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