raspberry-pi-scrolltext-weather-report/webcam.py

offline = False
try:
  from luma.led_matrix.device import max7219
  from luma.core.interface.serial import spi, noop
  from luma.core.render import canvas
except ModuleNotFoundError as e:
  offline = True
  import numpy as np

from PIL import Image, ImageDraw
import cv2

cap = cv2.VideoCapture(-1)

if not offline:
  # create matrix device
  serial = spi(port=0, device=0, gpio=noop())
  device = max7219(serial, cascaded=4, block_orientation=-90, rotate=0)
  print("Created device")

while True:
  success, image = cap.read()
  if success:
    image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    width, h = image.shape
    height = int(width/32*8)
    offset = int(h/2-height/2)
    image = image[offset:offset+height, :]
    image = cv2.resize(image, (32,8), interpolation = cv2.INTER_AREA)
    image = cv2.Canny(image, 0, 200)
    im = Image.fromarray(image)
    im = im.convert('1')
    if offline:
      image = np.asarray(im.convert("RGB"))
      cv2.imshow("image", cv2.resize(image, (640,120), interpolation = cv2.INTER_NEAREST))
      if cv2.waitKey(1) & 0xFF == ord('q'):
        break
    else:
      with canvas(device, im) as draw:
        pass
  else:
    exit(1)