Motion and orientation help to establish correspondence
| R. van Ee & B.L. Anderson (2001). Motion direction, speed, and orientation in binocular matching. Nature, 410, 690-694. |  |
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These two images depict what the left and the right eyes see when you view an array of oriented bars (for example mimicking a forest). |
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When we superimpose the left and the right eyes' images we get an image with quite a lot of red and green bars. For the visual system it is hard to make a 3D reconstruction from the superimposed images because binocular matching is ambiguous. The visual system is confronted with the problem: which bar in the left eye corresponds with which bar in the right eye? [View this stereogram with red green glasses (red in front of the right eye).] |
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Now, move your cursor over the image to add motion to the bars. You will notice that perceived depth becomes vivid. Motion acts a kind of flag to help to establish correspondence between the two eyes' images. In our paper we describe that it is not just motion parallax that causes this effect. Pieter Schiphorst, the computer wizard in our lab made the JavaScript that enables us to add motion to the red-green-yellow image by moving the cursor over it. |
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