问Opencv背景差分不检测具有小雪阵雨的视频的移动对象

EN

import processing.core.*;
import processing.video.*;
import gab.opencv.*; 
public class BackgroundSubtraction extends PApplet {

Movie video;
OpenCV opencv;

public void setup(){
    size(720,680);
    video = new Movie(this, "/home/gurinderbeer/Downloads/IMG_1570.MOV");
    opencv = new OpenCV(this, width, height);
    opencv.startBackgroundSubtraction(0, 3, .5); // 5,3, .5
    video.play();
    }

public void draw() {
    image(video, 0, 0); 
    opencv.loadImage(video);
    opencv.updateBackground();
    opencv.dilate();
    opencv.erode();
    noFill();
    stroke(255, 0, 0);
    strokeWeight(3);
    for (Contour contour : opencv.findContours()) {
        contour.draw();
        }
    }


public void movieEvent(Movie m) {
      m.read();
    }

public static void main(String _args[]){
    PApplet.main(new String[] { BackgroundSubtraction.class.getName()});
    }
}