Freeviewing is a way to view stereo images on a computer monitor. The aim here is to overlay the left and right image by directing the eyes. As stereocards always have the left view on the left, and the right view on the right, 'parallel' viewing is appropriate, with each eye looking at the view in front of it. The eyes are therefore directed as if they are looking at an object in the far distance, but the image is not at a great distance, so the eyes need to focus more closely than normal for that convergence.
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Normal Viewing
both eyes fixate (converged on) the same point. The fields of view of the two eyes overlap. |
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Parallel Stereoscopic Freeviewing
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Eyes pointed as if looking into the distance. They fixate similar points
on the left and right views presented to them, which then fuse into
a single 3D perception. |
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This is a representation of what you see when successfully freeviewing. The 3D percept is in the middle, flanked on either side by a ghostly image which is only seen in the left or right eye respectively. Try it on these images.. |