1. A system of revising depth of a three-dimensional (3D) image pair, comprising: a depth generator configured to generate at least one initial depth map associated with one image of the 3D image pair based on stereo matching technique, wherein the one image comprises a plurality of pixels, and the initial depth map carries an initial depth value of each pixel; and a depth revisor, comprising: an inconsistence detection unit configured to detect the inconsistence among the pixels based on two-directional occlusion detection technique and estimate a reliable map according to the detected inconsistence; and an interpolation unit configured to interpolate the initial depth value according to the reliable map and the proximate pixels, so as to generate a revised depth map by revising the initial depth value.