A method and system for detecting anomalies in video footage. An illustrative embodiment of the method includes providing an impact head simulating a corner of a box, providing an impact specimen, causing impact of the impact head with the impact specimen and examining the impact specimen. The nanospheremicrosphere is prepared by solvent-nonsolvent method, in-liquid drying method andor spray drying method, and has the features of high drug loading and high encapsulation efficiency, controllable release of medicine and no irritant to application site or blood vessel.