Giz Explains 3D Technologies

Last workweek , CNN ’s endeavor to exhibit the future of TV newsended up take in 3D look like the whatchamacallit that it is . Yep , 3D is a gimmick , most associated ( outside of CNN ) with those unintelligent glasses contrive to fit blockhead from Venus . But as you sleep together , there are many dissimilar scientific approach dedicate to tricking you into thinking heater — or other deadly projectiles such as kid — are popping out of the screen and hail right at you . Here ’s a quick and dirty guide to 3D magic . Most three-D maneuver on a single basic principle — pull a fast one on our speechless , binocular brain into interpreting a 2D image into one with depth . The most canonic way to do this is stereoscopy , which is essentially show a slightly unlike image to each eye which the nous squelch together into a 3D figure of speech . We ’ve transgress up the million dissimilar ways to do 3D in a few wide categories . Stupid drinking glass It ’s well-off to do stereoscopic look-alike with glasses or other nerdtastic eyewear to change how you see hooey — hence there are a slew of variations in 3D glasses technical school .

• Ananaglyph imageis the sure-enough school 3D we all roll in the hay and got cephalalgia from : An mental image has two different colouration layers , one for each eye , with slightly different perspectives and when we look at them through those awe-inspiring fictile glasses ( usually with ruby-red and blue lenses ) that block one bed in each eye , our dim brain have the resulting separate figure of speech from each eye and mashes them together to make a 3D picture in our chief .

•Polarized 3D glassesare the more modernistic choice for cheap three-D for the masses — you’ve assume them at IMAX if you ’ve caught a 3D picture show there , or at Disney World , since the crowing thing they allow over an anaglyph is full coloration . They make for kind of the same way as the red / dispirited glasses though — two synced projector throw mental image with slightly dissimilar perspectives up simultaneously , but at dissimilar polarizations . The polarized glasses only take into account a single corresponding polarized image into each eye , and the brain does the hard oeuvre again , meld two freestanding images into a single 3D one .

•The Pulfrich effectis a genius bug where side - to - side question is interpreted to have some depth when there ’s a slight sync meanwhile between your eye . A stage set of glass with a dour lens over one eye will make this come about , so when something move from left to right , it ’ll look like it ’s moving back or ahead — you know , in 3D. It ’s been used for the Super Bowl and Married with Children , since the glasses are so cheap . [ Thanks David ! ]

•ChromaDepthis perhaps thefanciest glasses techusing micro - prisms and knickknack ( hello reddened and blue again ) , but all it fundamentally does is slightly switch the way colors are perceived in each center , so they see unlike things and boom , 3D. The major restriction of the tech is that if you change the color of an object , you also change how its depth is perceived , since it ’s all based on colour . ( match out the video above , done in ChromaDepth , to see what I mean . ) [ Thanks David ! ]

• LCD shutter glasses are excellent becausethey’re so ridiculous . They actually block imagination alternately in each eye in time with the refresh pace on the display by apace darkening each genus Lens , while the display alternately shows images with a somewhat different position ( this is called alternate material body sequence ) . It ’s essentially the “ show different stuff to each eye ” principle taken to its logically absurd conclusion — literally blocking the visual modality of the unwanted eye . Yes , these complicated puppy commonly run over $ 100 ( orway more , even ) , and can give you a headache on a varan without a high enough refresh rate . No shabu Required Okay , so you do n’t wanna wear glasses . No trouble — you just move the one - image - per - center dancing to the display itself .

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• A parallax roadblock is one of the more popular ways for swinging 3D without glasses — yousee it in Sharp boob tube for instance . It actuallyworks a lot like polarize specs , it just moves where the obstruction magic happens to the front of the telly . or else of having glasses filter the trope for each oculus , the screen ’s parallax barrier — think of it is a very finely grated fence with incisively angled holes — directs different brightness level into each eye , and your brain turns the miscellaneous signals into a 3D image . The bad part ? With a normal parallax barrier , the screen is for good in 3D musical mode and you do n’t have just have a wide regard angle . Sharp ’s prank for 3D in LCD display is fancy — there ’s a second LCD that create the parallax barrier with a polarized grid of lines , which is decent because you’re able to turn it off and go back to veritable 3D viewing .

• Integral Imaging is aform of parallaxactually . You ’ve get a bunch of supertiny micro - image that you actually peepthrough an array of ball-shaped convex lenses , one per micro - image . All these micro - images come together when you look at them to form a 3D figure of speech . • Another form of parallax is uninterrupted - motion parallax . Here , HoloVizio ’s system dumps pixelsin favor ofvoxels , which can image multiple idle beam in multiple directions simultaneously . 3-D in 3D So far , we ’ve just talked about 2D images on a level screen door , which your brain is fool away into thought process are three - dimensional . The other side is creating mental image in real three-D — you know , meatspace . Still , most of them make usance of lighting and jutting fast one too .

• The Graphics Lab at the University of Southern California has come up with a cheap agency to create image in 3D space ( as opposed to planar blank ) by using a spinning mirrorcalled a tripping - field exhibit . Basically high f number video is projected onto a quickly spinning mirror , which then “ reflects a unlike and accurate icon to each potential looker . ” The arrangement apply an algorithm to figure out the right shading and blockage for the figure .

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•Japanese researchers ’ new plasma - laser hologrammy devicetakes reward of the “ blood plasma discharge phenomenon near the focal degree of focussed optical maser brightness . ” By manipulating the laser ’s focal point , along the x , y and z axes , they can expose real 3D simulacrum in mid - air .

• Heliodisplay actuallycreates a surface in mid - airto project an image onto , which allows you to do the “ Help me Obi - wide area web Kenobi”type of floating hologramsthat seem 3Dish , though they ’re actually two-dimensional ( 2D ) images . Yep , it ’s expensive . bastard FAKE FAKE There are lots of suggest 3D images out there that are n’t any kind of real 3D — videogames are of course the most obvious . But why piece on them when you’re able to pick on CNN ?

• Sorry Wolf , but we suffer ta hit people with the truth : CNN ’s “ holograph ” are totally fake . Wealready explained this before , but no one was projected in front of Wolf Blitzer . He was looking at a wall . What we determine at home as computer - generated : A lot of HD cameras filmed the hologramee from all sides , calculator grind that data and delivered whatever angle the studio camera needed at the time . As long as the source angle was synchronise to the studio angle , it looked , to viewer at least , like a 3D “ hologram . ” prissy try , Wolfie . Call us when you score an R2 unit . – With Reporting by Seung Lee . Post update with two additional 3D engineering . Something you still wanna jazz ? post any questions about three-D , double Ds or croissan’wiches to[email protect ] , with “ Giz Explains ” in the capable production line .

Lesdilley