3D Guides, — November 21, 2010 6:32 — 71 Comments
3D Glasses
The history, and the technology, behind the quest to invent a 3D viewing experience is a lot older than you might expect.
Most people don’t realise it, but 3D viewing has been around for over 100 years. The first patent for stereoscopic (3D) film was filed by British photographer and inventor William Friese-Greene, whose technique involved projecting two films side by side and having viewers watch through a large box called a stereoscope.
Despite the difficulties of his method, Friese-Greene had laid the foundation of just about every 3D technology that was to follow. How? By replicating the work of the human eye with two separate cameras, each one showing two perspectives that differ by just as much as those of our eyes (just under 2 inches/5cm apart), and then providing audiences with a binocular device through which they could view the two images. The brain processes these just as it would any normal view and voila! Basic 3D vision.
From these early experiments, the popularity of 3D came and went, and with it a variety of formats passed into and out of existence. Today, we are familiar with two main types of 3D, one slowly dying and another on the ascendant. Both, however, use their own technology to project two layers of images onto a screen and glasses handed out to viewers to separate them.
The first is associated with those paper red/blue or red/green glasses that were re-popularised in the 1980s in films like ‘Jaws 3-D’. This is called the anaglyph system, and it works by projecting colour-filtered images onto the cinema screen, which are then filtered through the coloured lenses in the glasses so that each eye sees only one of the two images.
This method, though simple and relatively cheap, suffered from ‘ghosting’ images and a decrease in the colour quality of the image.
The second, which has been advanced further in today’s methods such as ‘RealD’ is polarization. Invented in the 1929, the principle of polarization allowed for light waves to be modified so as to change how they appear to the human eye.
The original use was to reduce glare from car headlights but, applied to cinema, polarization filters were used to create two perspectives that are de-filtered by the glasses we see in cinemas today. By avoiding direct changes to the colour, polarization allows for a much better range of colour and reduces ‘ghosting’.
Methods that do not require glasses are currently in development, particularly in the TV and handheld device markets. So look out for a 3D future beyond glasses…
About the author
Nicole has written 11 articles for
[...] of 3D so I thought that I’d write an article on 3D DVD players. Please read our articles on 3D glasses and 3D TV’s as well. Audiences across the globe are captivated by the visual affects of 3D [...]
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