text: """
  @file laplace_demo.py
  @brief Sample code showing how to detect edges using the Laplace operator
  """
  import sys
  import cv2
  
  def main(argv):
      # [variables]
      # Declare the variables we are going to use
      ddepth = cv2.CV_16S
      kernel_size = 3
      window_name = "Laplace Demo"
      # [variables]
  
      # [load]
      imageName = argv[0] if len(argv) > 0 else "../data/lena.jpg"
  
      src = cv2.imread(imageName, cv2.IMREAD_COLOR) # Load an image
  
      # Check if image is loaded fine
      if src is None:
          print ('Error opening image')
          print ('Program Arguments: [image_name -- default ../data/lena.jpg]')
          return -1
      # [load]
  
      # [reduce_noise]
      # Remove noise by blurring with a Gaussian filter
      src = cv2.GaussianBlur(src, (3, 3), 0)
      # [reduce_noise]
  
      # [convert_to_gray]
      # Convert the image to grayscale
      src_gray = cv2.cvtColor(src, cv2.COLOR_BGR2GRAY)
      # [convert_to_gray]
  
      # Create Window
      cv2.namedWindow(window_name, cv2.WINDOW_AUTOSIZE)
  
      # [laplacian]
      # Apply Laplace function
      dst = cv2.Laplacian(src_gray, ddepth, kernel_size)
      # [laplacian]
  
      # [convert]
      # converting back to uint8
      abs_dst = cv2.convertScaleAbs(dst)
      # [convert]
  
      # [display]
      cv2.imshow(window_name, abs_dst)
      cv2.waitKey(0)
      # [display]
  
      return 0
  
  if __name__ == "__main__":
      main(sys.argv[1:])
  