We next show the results from the distinction of apparent contours from fixed features. Fig. 4 (a) shows a curved surface (vase) used in this experiment. The contour curve of a lip of the vase is a fixed feature, while the contour curve of the side of the vase is an apparent contour. We now distinguish the fixed features (lip of the vase) from the apparent contour (side of the vase) by using the proposed method.
The contour curves of the vase in sequential images are extracted and
used for the affine reconstruction of contour generators. The
reconstructed contour generators of the vase are projected back into the
first image as shown in Fig.
4
(b). As shown in this image, the projected contour generators coincide
with the original curves at the lip of the vase, and do not coincide at
the side of the vase. The distances,
, between the projected contour generators and the original curves along
epipolar lines are computed and plotted in Fig.
4
(c). The points on the apparent contour are distinguished from fixed
features by using
, and are shown in Fig.
4
(d) by (
). (
) in Fig.
4
(d) shows extracted fixed features. The lip of the vase is clearly
distinguished from the apparent contours.
Figure 4:
Results of the distinction of apparent contours. (a) shows a curved
surface (vase) with fixed features (lip) used in this experiment. (b)
shows the image of the contour curves (solid lines) at (t = 0) and the
projection of the reconstructed contour generators (dashed lines) at
time (t = 1). (c) shows the distances,
, between these two curves along the epipolar lines. The apparent
contours are distinguished from the fixed features by using
. The distinguished apparent contours and fixed features are shown by (
) and (
) in (d) respectively.
J. Sato