Fig. 1. Flow chart of proposed algorithm

Fig. 2. Diagram of Census conversion

Fig. 3. Comparison of disparity refinement algorithms. (a) Algorithm in Ref.[18]; (b) proposed algorithm

Fig. 4. Experiment results in WorldView stereo pair. (a) Left image; (b) right image; (c) feature point extraction in left image; (d) feature point extraction in right image; (e) disparity map of SGM algorithm based on mutual information; (f) disparity map of proposed algorithm; (g) disparity map of WACS algorithm; (h) rendering disparity map of proposed algorithm; (i) refined disparity map

Fig. 5. Experimental results in IKONOS stereo pair. (a) Left image; (b) right image; (c) feature point extraction in left image; (d) feature point extraction in right image; (e) disparity map of SGM algorithm based on mutual information; (f) disparity map of proposed algorithm; (g) disparity map of WACS algorithm; (h) rendering disparity map of proposed algorithm; (i) refined disparity map

Fig. 6. Experiment results in SuperView-1 satellite stereo pair. (a) Left image; (b) right image; (c) feature point extraction in left image; (d) feature point extraction in right image; (e) disparity map of SGM algorithm based on mutual information; (f) disparity map of proposed algorithm; (g) disparity map of WACS algorithm; (h) rendering disparity map of proposed algorithm; (i) refined disparity map

Fig. 7. Accuracy of stereo matching in experimental data set

Table 1. Detection results of experimental image feature points

Table 2. Result comparison of different algorithms in experimental images