code: def __init__(self):
      self.frame_in = np.zeros((10, 10, 3), np.uint8)
      self.frame_ROI = np.zeros((10, 10, 3), np.uint8)
      self.frame_out = np.zeros((10, 10, 3), np.uint8)
      self.samples = []
      self.buffer_size = 100
      self.times = []
      self.data_buffer = []
      self.fps = 0
      self.fft = []
      self.freqs = []
      self.t0 = time.time()
      self.bpm = 0
      self.fd = FaceDetection()
      self.bpms = []
      self.peaks = []
      self.fu = Face_utilities()
      self.sp = Signal_processing()
  
file_path: heart-rate-measurement-camera/process.py
imports: import cv2
  import numpy
  import time
  from face_detection import FaceDetection
  from scipy import signal
  from face_utilities import Face_utilities
  from signal_processing import Signal_processing
  from imutils import face_utils
label_desc: Use image node_id 1 to create a new Process object from inherited base classes: object with example: obj = Process()