willprice

Install OpenCV 4.1.2 on Raspbian Buster

$ chmod +x *.sh
$ ./download-opencv.sh
$ ./install-deps.sh
$ ./build-opencv.sh
$ cd ~/opencv/opencv-4.1.2/build
$ sudo make install

garybradski

import cv2
import numpy as np

def connected_components(thresh_img):
    thresh_img = mog_mask.copy()
    contours, hierarchy = cv2.findContours(thresh_img, cv2.RETR_TREE,
                                           cv2.CHAIN_APPROX_SIMPLE)
    fg_mask = np.zeros(frame.shape[:2], np.uint8)
    i = 0
    cs = []

LeoHuckvale

Useful tip from the late creator of matplotlib, John Hunter.

http://matplotlib.1069221.n5.nabble.com/dynamically-add-subplots-to-figure-td23571.html

import matplotlib.pyplot as plt

# start with one
fig = plt.figure()
ax = fig.add_subplot(111)