class_docstr: Detect hand pose information from body pose estimation result.
  
  Args:
      ratioWristElbow(float): Ratio to adjust the wrist center, ,default is 0.33.
code: def __init__(self, ratioWristElbow: float = 0.33):
      self.ratioWristElbow = ratioWristElbow
  
imports: import os
  import math
  import base64
  from typing import Callable
  import cv2
  import numpy
  import matplotlib
  from matplotlib import pyplot
  from matplotlib.figure import Figure
  from matplotlib.backends.backend_agg import FigureCanvasAgg
label_desc: Use image node_id 1 to create a new HandDetect object  with example: obj = HandDetect(ratioWristElbow)