imwarp_quadrangle

imwarp_quadrangle(img: np.ndarray, polygon: Polygon | np.ndarray, dst_size: tuple[int, int] | None = None, do_order_points: bool = True) -> np.ndarray

• Description: Applies a 4-point perspective transform to the input image.

• Parameters

  • img (np.ndarray): The input image to be transformed.
  • polygon (Polygon | np.ndarray): A polygon with four points. If np.ndarray is provided, it is converted to Polygon first.
  • dst_size (tuple[int, int] | None): Output image size (width, height). If None, it is inferred from polygon.min_box_wh.
  • do_order_points (bool): Whether to order the 4 points clockwise (TL, TR, BR, BL). Default is True.

• Returns

  • np.ndarray: The transformed image.

• Example

  import capybara as cb
  
  img = cb.imread('./resource/test_warp.jpg')
  polygon = cb.Polygon([[602, 404], [1832, 530], [1588, 985], [356, 860]])
  warp_img = cb.imwarp_quadrangle(img, polygon)

  

  The green box in the image above represents the original polygon area.