![]() Some people have more luck with this than others. Another is to place two pennies on the table and look at them, letting your eyes go out of focus until you can see three pennies. One way is to stare at something that is about a foot behind the page (or your computer screen) and then quickly look at the pattern without focusing on it. If you have trouble seeing the image, there are several things you can try. Once you can see this one, get out your word processor and try adding and subtracting characters to see how it changes the 3D image. Your brain decides that they must be behind an edge, so you see the block of text sticking out towards you. This time there is a difference some of the zeros are missing. When you look past the page, your eyes focus on different parts of the pattern. In the second stereogram, we changed part of the pattern. With the top stereogram, both eyes are seeing different parts of the pattern, but because they are both the same, you still see a flat image. Your brain combines these two different images into one three dimensional image, letting you see depth by comparing the two images. ![]() Also, some parts that your left eye could see are hidden. Since it is looking from a different angle, it can see some parts that your left eye could not. Notice that the image you see has changed a bit. For information on how to see the effect, please visit the Wikipedia article on Autostereograms. Hidden inside each image is an object which appears 3D when viewed correctly. Then switch eyes, closing your right eye and opening your left. A stereogram is a 3D picture within a picture. Look carefully at the edges, noticing which parts you can see. It could be a lamp, a chair, or even your little brother, if you can get him to sit still long enough. To understand that, we need to understand how we see things three dimensionally. When you get your eyes focused properly, you will see a block of numbers raised up in the center of the three lines that we removed the zeros. Now look at the pattern in the same way you look at other stereograms. Both eyes see the same thing, so it just looks flat. You can try this with the pattern above, but it won't do any good. When you look at the pattern, you want your focus to be behind the page, so that your right eye is seeing the pattern in one place and your left eye is seeing the same pattern in a different place. You will need your computer and a program where you can type.īegin with a repeating pattern. Have you ever wondered how they are made? Lets take a look. It made simple the view of the 3D image, possible also without any helping instrument and called “simple stereoscopic view”.Have you ever seen a random dot stereogram? You see them on posters, cards, calendars, etc? It can be a random pattern of dots or a repeated pattern of just about anything, and if you stare at it in just the right way you suddenly see a 3 dimensional image sticking out of the page. Looking to the images with the stereoscope the viewer had the impression to see the 3D one. That helped each eye to focus on the right image to see, giving the possibility to get the stereographic 3D image. Wheatstone, knowing the functioning of visual system in the humans, created, for the first time, a stereoscope, an instrument based on mirrors and prisms, Charles Wheatstone in 1838, but before him Euclid, the greek philosopher, Leonardo and other were fascinated about the theme and studied it. ![]() The functioning of stereograms was discovered by the philosopher and english inventor sir. The term “stereoscopic” was created by the Belgian jesuit François d’ Aguillon in 1613, that use this term in his essay ” Opticorum libri sex: philosophis juxta ac matematicis utiles” (Six books of optic: useful as for philosophers as for mathematicians). The texture can be a random dots image or a fantasy of colors. The ones I propose and the most common on the web are called “autostereograms” and their feature is that they are composed of just one image covered by a texture coloured or in B/W.
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