使用漸進式的濾波方法取得背景影像。將原始影像序列與此code擺放於同一資料夾，等待數秒後即可得到輸出背景影像Mt。-The use of step-by-step filtering method to obtain the background image. The original image sequence and the code placed in the same folder, and after waiting a few seconds to get the backgrou