Fig. 1. Principle of oversampling

Fig. 2. Schematic of sampling model

Fig. 3. Image multi-resolution pyramid

Fig. 4. Results of target multi-resolution simulation

Fig. 5. Variation of area with down-sampling times for two different targets. (a) Target 1; (b) target 2

Fig. 6. Variation of aspect ratio with down-sampling times for two different targets. (a) Target 1; (b) target 2

Fig. 7. Variation of motion direction with down-sampling times for multiple targets

Fig. 8. Variation of target average area radio with down-sampling times

Fig. 9. Variation of shape shift rate with down-sampling times for single-sampling targets

Fig. 10. Variation of direction offset with down-sampling times for multiple targets

Fig. 11. Comparison oftargets under different sampling systems (inner ring for single-sampling, outer ring for over-sampling). (a) Target 1; (b) target 2; (c) target 3