在python中绘制图形

Question

from SimpleCV import *

cam = Camera()
threshold = 5.0 # if mean exceeds this amount do something

while True:
        previous = cam.getImage() #grab a frame
        time.sleep(0.5) #wait for half a second
        current = cam.getImage() #grab another frame
        diff = current - previous
        matrix = diff.getNumpy()
        mean = matrix.mean()

        diff.show()

        if mean >= threshold:
                print "Motion Detected"

我使用相机以每秒2幅图像的速度拍摄图像，持续10秒：

现在意味着每秒颜色积分密度在两帧内计算差异:(借助上面给出的代码）

平均差异出现（例如）在每秒一次后的30-40范围内：

times                 0---1---2---3---4---5---6---7---8---9---10 

calculated mean      38  40  39   32  40  35  39  40  38 38   37

现在我想实时绘制python中的图形来计算每60秒的位数