The right lens blocks all red light from coming into the right eye, so that eye only sees the part of the image in blue. The overlaid image must then be viewed through special glasses such as those illustrated in Image 4. When the observer looks through the View-Master, each eye sees a slightly different angle of a scene, creating the impression of stereoscopic depth.Īnother way to deliver different images to the two eyes, popular in 1950s horror films, is to overlay the two images on top of each other, but pass one image through a red filter and the other through a blue filter. An early-model View-Master (from 1945) is shown in the upper right of the image and a 1960s version in the center. The most common modern stereoscope is the View-Master, which holds seven pairs of stereo images in the reel shown in the bottom right of Image 3. ![]() The left image is then reflected into the left eye and the right image into the right eye, and voila! the scene pops out in 3D. ![]() ![]() The viewer’s nose is positioned so it just touches the intersection of the two mirrors. Image 2 shows a very early stereoscope, developed by Sir Charles Wheatstone in the 1840s. The left and right lenses of the Sputnik take two pictures of a scene from roughly the positions of the photographer’s two eyes (the middle lens is for the camera’s viewfinder).īoth of these pictures look just like a normal two-dimensional photos, and both can be viewed simultaneously using a stereoscope: a special device for showing one image to the left eye and a different image to the right eye. The most straightforward way to produce a sense of three-dimensional depth from two-dimensional images is to take a picture of a scene using a special stereoscopic camera such as the Russian-made “Sputnik” model shown in Image 1. The first time you do this activity you should probably go through the parts in order from top to bottom. Click on the images to toggle between them (image numbers referred to in the explanations will appear in the upper right of the yellow area on the screen). InstructionsĬlick on the links at left to jump to different parts of the activityĮach part contains multiple images. This activity illustrates several of these techniques, including one, the random dot stereogram, which has played an important role in scientific research on stereopsis. Nonetheless, there are techniques for producing stereograms-two-dimensional images that, when viewed under special circumstances, trick the brain into computing disparity information so that a sense of depth is created. However, if you are viewing a two-dimensional picture of a scene, whether printed in a book, hanging in a museum, or displayed on a computer monitor, your two eyes do not receive different images of the picture, so you don’t get the same sense of depth that you would if you were viewing the scene in person. Your brain then “fuses” these images together to create a sense of depth called stereopsis. I was in high school reading OMNI magazine (add that to my nerd cred), and I came across this article about a man named Dan Dyckman who developed software to make your own single image random dot stereograms.As you learned in the activity on Binocular Disparity, when you view a three-dimensional scene, your eyes receive two slightly different images of the world. It was a very basic 3D stereogram.įast forward several years to November, 1991. I used to reach up and try to touch them, and the illusion would break as my fingers passed through them. Where the holes in the board weren’t completely aligned, some dots floated closer to me than the rest. I found that I could see the pattern clearly even though my eyes were focused on a different plane, and the dots appeared to float in space between me and the top bunk. ![]() The views from my eyes would diverge, causing double vision, until the pattern of holes overlapped again. As I lay in bed staring up at those dots, I’d let my eyes relax. The wood panels that supported the top mattress had a grid of holes like peg board. I used to sleep on the bottom bunk of a bed, and would stare up at the underside of the top bunk. But I accidentally discovered stereograms on my own as a little kid right around the same time. Stereograms were invented by a neuroscientist named Christopher Tyler in 1979.
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