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There are a number of different techniques employed to produce 3D pictures. The basic principles are the same but the methods of recording, displaying and watching the double images differ.
Check out our 3D TV reviews here, and see how the 3D models compare with other 2D models in our regular plasma, LCD and LED TV reviews
Anaglyphic 3D
Anaglyptic 3D glasses
Yesterday's news - old style 3D specs are obsolete
To date most people would have associated 3D with a pair of flimsy red/cyan-filtered glasses and movies like Jaws 3D or House of Wax.
The process is called the anaglyphic method and up until very recently was the most popular way to render 3D images.
The anaglyphic method is where images in a film are constructed of two different coloured layers – usually red and cyan, slightly offset from the original image. With the colour-filtered glasses on, viewers see a different coloured image in each eye.
The red lens allows one eye to see only the red parts of the image and the cyan lens lets the other eye see only the blue/green portions.
However, the brain is fooled into perceiving the coloured layers as one, creating an added sense of depth and creating the 3D image.
Compared to the latest techniques the anaglyphic method looks fairly primitive. Poor image quality, blurring and motion sickness are common problems.
Polarisation 3D
polarised 3D glasses
Sky's 3D TV service works with polarised 3D specs
The polarisation method will be familiar to anyone who has made a trip to see a 3D movie at the cinema of late.
The principles are the same as anaglyphic – two slightly different images are seen by each eye, but combined by the brain into one image giving an extra sense of depth – though the delivery method is different.
The glasses work simply by allowing each eye to see differently polarised light. For instance, light polarised in one direction will be seen by the right eye and light polarised in the other by the left.
The Sky 3D TV service set to launch in 2010 uses a pair of passive polarised glasses.
Alternate frame sequencing (or frame sequential)
Active shutter LCD glasses
Active shutter 3D glasses
The frame sequential method is used on 3D Blu-ray discs and requires a pair of active shutter glasses to work.
Footage is recorded by two cameras (or one camera with two lenses) and then placed next to each other on a ‘strip’ of film, and subsequently displayed frame-by-frame, or one after another, in alternating order.
Active shutter glasses synchronise with the TV via an infra-red signal and rapidly blink on and off, playing back images to the right eye and left eye at a rate of 50 frames per second.
Most new 3D TVs come supplied with a pair (or two) of active LCD shutter glasses. The glasses are typically made to work with that specific brand of TV only and are primarily designed for watching 3D Blu-ray discs.
The glasses are more expensive than the polarised filter types given away at the cinema and require a power source to drive the LCD shutters.
On the glasses we’ve seen to date, some are powered by small watch-type batteries, others can be charged via the USB port on the TV.
Keep an eye on our expert Blu-ray player reviews for test results for the latest 3D Blu-ray players.
Auto-stereoscopic 3D
The Holy Grail for the 3D TV industry is developing a method of watching in 3D without the viewer having to wear glasses – also known as auto-stereoscopic.
Philips has dabbled with the technology and displayed some of its prototype technology at CES 2009, though industry insiders reckon any workable system for the mass market is at least five years away.
Check out our 3D TV reviews here, and see how the 3D models compare with other 2D models in our regular plasma, LCD and LED TV reviews
Anaglyphic 3D
Anaglyptic 3D glasses
Yesterday's news - old style 3D specs are obsolete
To date most people would have associated 3D with a pair of flimsy red/cyan-filtered glasses and movies like Jaws 3D or House of Wax.
The process is called the anaglyphic method and up until very recently was the most popular way to render 3D images.
The anaglyphic method is where images in a film are constructed of two different coloured layers – usually red and cyan, slightly offset from the original image. With the colour-filtered glasses on, viewers see a different coloured image in each eye.
The red lens allows one eye to see only the red parts of the image and the cyan lens lets the other eye see only the blue/green portions.
However, the brain is fooled into perceiving the coloured layers as one, creating an added sense of depth and creating the 3D image.
Compared to the latest techniques the anaglyphic method looks fairly primitive. Poor image quality, blurring and motion sickness are common problems.
Polarisation 3D
polarised 3D glasses
Sky's 3D TV service works with polarised 3D specs
The polarisation method will be familiar to anyone who has made a trip to see a 3D movie at the cinema of late.
The principles are the same as anaglyphic – two slightly different images are seen by each eye, but combined by the brain into one image giving an extra sense of depth – though the delivery method is different.
The glasses work simply by allowing each eye to see differently polarised light. For instance, light polarised in one direction will be seen by the right eye and light polarised in the other by the left.
The Sky 3D TV service set to launch in 2010 uses a pair of passive polarised glasses.
Alternate frame sequencing (or frame sequential)
Active shutter LCD glasses
Active shutter 3D glasses
The frame sequential method is used on 3D Blu-ray discs and requires a pair of active shutter glasses to work.
Footage is recorded by two cameras (or one camera with two lenses) and then placed next to each other on a ‘strip’ of film, and subsequently displayed frame-by-frame, or one after another, in alternating order.
Active shutter glasses synchronise with the TV via an infra-red signal and rapidly blink on and off, playing back images to the right eye and left eye at a rate of 50 frames per second.
Most new 3D TVs come supplied with a pair (or two) of active LCD shutter glasses. The glasses are typically made to work with that specific brand of TV only and are primarily designed for watching 3D Blu-ray discs.
The glasses are more expensive than the polarised filter types given away at the cinema and require a power source to drive the LCD shutters.
On the glasses we’ve seen to date, some are powered by small watch-type batteries, others can be charged via the USB port on the TV.
Keep an eye on our expert Blu-ray player reviews for test results for the latest 3D Blu-ray players.
Auto-stereoscopic 3D
The Holy Grail for the 3D TV industry is developing a method of watching in 3D without the viewer having to wear glasses – also known as auto-stereoscopic.
Philips has dabbled with the technology and displayed some of its prototype technology at CES 2009, though industry insiders reckon any workable system for the mass market is at least five years away.
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