![]() The second technique was very successful. Not only is this somewhat slow, especially at higher resolutions, but it also causes the entire image to change, making it very difficult to keep the eyes focused. The second problem was that when the depth of the stereogram is increased, the entire image must be recalculated and redisplayed. This resulted in the flattened stereogram being even more difficult to see than the full-depth one. First, it seems to be more difficult to diverge the eyes just a little (focusing barely behind the screen) than it is to diverge them a lot. This method sounded good in theory, but didn’t work very well in practice for two reasons. The user can then gradually increase the depth of the stereogram (also increasing the amount the eyes must diverge) until the stereogram is at full depth. A very shallow 3D stereogram which requires very little eye divergence is then created, producing a flattened looking 3D image. When using this method, the stereogram starts out as a 2D image of the depth map. The first of the three techniques was also the least successful. I have discovered some properties of stereograms that affect how hard they are to see. The third technique is to use training stereograms that are easier to see. The second method helps the eyes remain correctly diverged until the 3D image can be decoded by the brain by providing guides for the eyes that help keep them focused properly. The first technique helps the eyes learn to diverge by interactively changing a picture which requires no eye divergence into a stereogram. Three techniques can then be used to assist the user to see the stereogram. Either a user-supplied bitmap or random dots can be used for vertical strip in which the stereogram is encoded. SeeIt allows the user to create stereograms from depthmaps, which can be either drawn by hand or created with a ray tracer. The implementation has taken the form of SeeIt, a Win32 program written with Visual C++. This project consisted of the implementation of three techniques to help the stereogramically challenged. It is hard for the viewer to know if his eyes are correctly focused and about to see 3D, or if he is just staring at a blurry jumble of colors. Another difficulty is that it takes some time for the brain to decode the 3D image hidden in the stereogram, even if the eyes are correctly focused. It is also difficult to know how far behind the stereogram to focus, and the correct distance varies from one stereogram to the next. It order to do so, the eyes must be slightly diverged, causing the stereogram to go out of focus. This may seem obvious, but it isn’t easy to look at an image and focus behind it instead of on it. For one thing, since the eyes must be focused behind the stereogram, they can’t be focused on the stereogram. Stereograms are difficult to see for several reasons. Thus when the viewer’s eyes are focused the correct distance behind the stereogram, the hidden 3D image will become visible. The images seen by the two eyes will be slightly different, just as the images seen by the two eyes are slightly different when viewing a 3D scene. ![]() If the eyes are focused correctly, both eyes will see nearly the same image. The strip is altered so that if the eyes of the viewer are focused at the correct distance behind the image, the left eye will see one vertical strip, and the right eye will see the strip adjacent to it. ![]() Modifications are made on each repeat of the image based on a depth map which defines the 3D image being encoded in the stereogram. The vertical strip is not repeated exactly, however. The aim of this project was to develop ways to assist these stereogramically challenged individuals.Ī stereogram image is created by taking a thin vertical strip of image and repeating it horizontally across the the width of the stereogram. Unfortunately, many people have difficulty seeing the 3D images hidden within the stereograms. When properly viewed, however, a stunning 3D image becomes visible. At first glance, most stereograms looks like nothing more than a jumble of colors and repeated patterns. Stereograms are images which have 3D information hidden within them. Stereograms have become the subject of books, posters, calendars, screen savers, and more. The last eight years have seen an explosion in stereogram popularity. Burton, Computer ScienceĪlthough single-image stereograms were invented in 1979, they were virtually unknown until the 1990’s. ![]()
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