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import cv2
import numpy as np

# Define function to find contours and filter for tray edges
def find_tray_edges(image):
  # Convert to grayscale
  gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

  # Apply thresholding to separate tray from background
  # Adjust threshold value based on your image lighting
  thresh = cv2.threshold(gray, 200, 255, cv2.THRESH_BINARY)[1]

  # Find contours
  contours, _ = cv2.findContours(thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

  # Filter contours based on size and aspect ratio for tray edges
  tray_edges = []
  for cnt in contours:
    approx = cv2.approxPolyDP(cnt, 0.01 * cv2.arcLength(cnt, True), True)
    if len(approx) == 4:  # Check for quadrilateral shape
      x, y, w, h = cv2.boundingRect(approx)
      aspect_ratio = float(w) / h
      # Adjust size and aspect ratio thresholds based on your tray dimensions
      if w > 50 and h > 50 and 0.8 < aspect_ratio < 1.2:  # Adjust thresholds for tray size
        tray_edges.append(approx)

  return tray_edges

# Load image (replace 'path/to/image.jpg' with your image path)
image = cv2.imread('path/to/image.jpg')

# Find tray edges
tray_edges = find_tray_edges(image.copy())

# Draw edges on the image (optional)
if tray_edges:
  for edge in tray_edges:
    cv2.drawContours(image, [edge], -1, (0, 255, 0), 2)  # Draw green lines on edges

# Display the image with identified edges (optional)
cv2.imshow('Image with Tray Edges', image)
cv2.waitKey(0)
cv2.destroyAllWindows()