python帧差法

适合局域网花屏屏蔽，摄像头不动的运动检测，pc上5ms以内，经常是2ms

不能物体移开。

import time
import numpy as np
import cv2
def absdiff_demo(image_1, image_2, sThre):
    gray_image_1 = cv2.cvtColor(image_1, cv2.COLOR_BGR2GRAY)  # 灰度化
    gray_image_1 = cv2.GaussianBlur(gray_image_1, (5, 5), 0)  # 高斯滤波
    gray_image_2 = cv2.cvtColor(image_2, cv2.COLOR_BGR2GRAY)
    gray_image_2 = cv2.GaussianBlur(gray_image_2, (5, 5), 0)
    d_frame = cv2.absdiff(gray_image_1, gray_image_2)
    ret, d_frame = cv2.threshold(d_frame, sThre, 255, cv2.THRESH_BINARY)
    return d_frame


capture = cv2.VideoCapture(0)
sThre = 10  # sThre表示像素阈值
i = 0
while (True):
    ret, frame = capture.read()
    if i == 0:
        cv2.waitKey(1)
        i = i + 1
    ret_2, frame_2 = capture.read()