opencv.py

import cv
import time

tolerance = 2

webcam_stream = cv.CaptureFromCAM(0)

print cv.GetCaptureProperty(webcam_stream,cv.CV_CAP_PROP_FPS)
print cv.GetCaptureProperty(webcam_stream,cv.CV_CAP_PROP_FRAME_WIDTH)
print cv.GetCaptureProperty(webcam_stream,cv.CV_CAP_PROP_FRAME_HEIGHT)

start = time.time()

images = []
while (time.time()-start)<1:
	this_image = cv.QueryFrame(webcam_stream)
	this_image_time = time.time()
	images.append([this_image,this_image_time])

print(len(images))

i = 0
last_image_time = images[0][1]
for j in range(len(images)-1):
	last_image = images[j][0]
	this_image = images[j+1][0]
	diff = cv.CloneImage(this_image)
	cv.AbsDiff(this_image,last_image,diff)
	if cv.Avg(diff)>tolerance:
		i = i + 1
		print [i,images[j+1][1]-last_image_time]
		last_image_time = images[j+1][1]

simplecv.py

import SimpleCV
import numpy
import time

tolerance = 2

webcam_stream = SimpleCV.Camera(0)
print webcam_stream.getAllProperties()

start = time.time()

images = []
while (time.time()-start)<1:
	images.append([webcam_stream.getImage(),time.time()])
	time.sleep(0.001)

print(len(images))

i = 0
last_image_time = images[0][1]
for j in range(len(images)-1):
	image1 = images[j]
	image2 = images[j+1]
	diff = (image1[0]-image2[0])
	if (numpy.average(diff.getNumpy()))>tolerance:
		i = i + 1
		print [i,image2[1]-last_image_time]
		last_image_time = image2[1]