In this appendix the expression for the motion of a junction point from the angles of two lines will be derived using the projective line representation. A junction point is represented as the intersection of two straight lines. This is a more general representation than was used by Malik , as it does not rely on rectified cameras. The following proof shows that this new representation can be used to derive Malik's two component disparity .
Figure 9: Occlusion junction (as defined by Malik)
These two lines in the left and right images intersect at (0;0) and (see figure 9).
This equation has related the angle of the lines forming the occlusion
junction to the horizontal disparity, and is the same result as
obtained by Malik .