抄録
A sharpness of horizontal three dimensional edge is perceived sharper than two dimensional edge, while vertical edge is perceived as same as two dimensional edge. We assumed that the difference of sharpness is caused by the occurrence of local binocular rivalry on half-occluded region of stereoscopic images. To confirm this assumption, we measured the time of alternation of dominant eye as an index of local binocular rivalry. The result showed that the alternation frequency increased only on the half-occluded condition and the distribution functions of the alternation duration differed from other conditions which suggested the occurrence of local binocular rivalry on the region.
