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Samleo

Is it correct to say that the problem comes about because the baseline doesn't intersect the image plane?

mpotoole

If two cameras are parallel to one another (i.e., they are pointing in the same direction), then the baseline is parallel to both image planes. As a result, the baseline doesn't intersect the image plane at any finite point; it "intersects" the plane at $\pm\infty$ though.

However ,this isn't really a problem. In fact, as we will see in the next lecture, this property will actually simplify the stereo algorithms used for computing depth from images like these.