Fig. 1. Flow chart of registration method

Fig. 2. Image redundancy removing simulation diagram. (a) Simulated image; (b) selected rows and columns to be excluded; (c) image after specific sampling

Fig. 3. Key point detection. (a) Original visible image; (b) original SAR image; (c) visible image after removing redundancy; (d) SAR image after removing redundancy; (e) Harris detection result of figure (c); (f) Harris detection result of figure (d); (g) LoG detection result of figure (c); LoG detection result of figure (d)

Fig. 4. Diagram of point rebuilding. (a) Coordinates of pixels in de-redundant image; (b) pixel coordinates of reconstructed points in original image

Fig. 5. Image registration effect map of the first pair. (a) SIFT; (b) SIFT-M; (c) PSO-SIFT; (d) DR-SIFT

Fig. 6. Image registration effect map of the second pair. (a) SIFT; (b) SIFT-M; (c) PSO-SIFT; (d) DR-SIFT

Fig. 7. Image registration effect map of the third pair. (a) SIFT; (b) SIFT-M; (c) PSO-SIFT; (d) DR-SIFT

Table 1. Comparison of key points repetition rate between Harris and LoG

Table 2. Knowledge of real multimodal image pairs

Table 3. Comparison of registration parameters of three methods