Illustrated Example
The process used to develop the first Random Dot Stereogram is illustrated below.
1. Create an image of suitable size. Fill it with random dots. Duplicate the image.
2. Select a region in one image.
3. Shift this region horizontally by a small amount. The stereogram is complete.
To view the stereogram, focus on a point behind the image by a small amount until the two images "snap" together . Note that viewing the identical images from step 2 in this manner will work, but the whole area will appear at the same depth. The shifted region produces the binocular disparity necessary to give a sensation of depth. Different shifts correspond to different depths. Another way to view it is to focus on a point in front of the images i.e. make "cross eyes" and force the images to snap together having your left eye focused on the right image and your right eye focused on the left image.
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