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  1. Copilot Answer
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    To fill contours in an image using OpenCV in Python, you can use the cv2.drawContours or cv2.fillPoly functions. These functions allow you to fill the area bounded by one or more polygons.

    Example using cv2.drawContours

    import cv2
    import numpy as np

    # Create a black image
    img = np.zeros((200, 200), dtype=np.uint8)

    # Define a contour (a square in this case)
    contour = np.array([[50, 50], [50, 150], [150, 150], [150, 50]])

    # Draw and fill the contour
    cv2.drawContours(img, [contour], -1, (255), thickness=cv2.FILLED)

    # Display the image
    cv2.imshow("Filled Contour", img)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

    Example using cv2.fillPoly

    import cv2
    import numpy as np

    # Create a black image
    img = np.zeros((200, 200), dtype=np.uint8)

    # Define a contour (a square in this case)
    contour = np.array([[50, 50], [50, 150], [150, 150], [150, 50]])

    # Fill the contour
    cv2.fillPoly(img, [contour], (255))

    # Display the image
    cv2.imshow("Filled Contour", img)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

    Note: The cv2.drawContours function with thickness=cv2.FILLED and the cv2.fillPoly function both effectively fill the contours.

    These methods are efficient and work well for filling closed contours in binary images. If you need to fill holes within contours, consider using flood fill techniques.

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    Find and Draw Contours using OpenCV | Python - GeeksforGeeks
    GeeksForGeeks
    How to draw a contour using OpenCV?
    OpenCV provides the following builtin function for drawing the contour. The first argument is the destination image on which to draw the contours, the second argument is the contours which should be passed as a Python list, the third argument is the index of contours that we want to draw (To draw all contours, pass -1).
    theailearner.com

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