说明：  採用算數平均法提取背景圖像，可以總結為在特定的時間段內對圖元點的亮度和彩色資訊取平均值，用平均值作為背景圖像對應圖元點數值。在讀入一段視頻時，對某一圖元點進行觀察，會發現在沒有前景的運動目標通過時，該點的灰度值保持穩定，變化很小，只有當前景的運動目標通過時，該點的灰度才會發生劇烈的變化。這樣就可以連續讀入N幀圖像，對圖像各點的灰度或色彩信息進行統計的方法，使得變化劇烈的像素點變的平緩，取其平均值作為背景圖像像素點的值。
(Using the arithmetic mean method extracts a background image, can be summarized as the luminance and color information of Fig element points average in a specific period of time, using the average value as the value of the background image corresponding to Fig element points. Reads a video, a figure element points observed, will find that no prospect of moving targets by the gray value remain stable, the change is very small, only when the the foreground moving target through which The only point gray dramatic change. This can be continuously read into the N frame image, on each point of the image the gray or color information statistical method, such that severe change in pixels becomes gentle, and the average value as the value of the pixel of the background image.)