Stereogram is an application to create autostereograms. An autostereogram is an image that creates the visual illusion of a 3D scene by viewing a totally different pattern image with the right vergence. All you need is a depth map (it's a 3D greyscale image) and a pattern image. You can use your own pattern image, a random dot pattern (default), or capture one with the built-in functionality. You may use a depth map from the built-in image browser or create your own one.