imwarp_quadrangle

imwarp_quadrangle(img: np.ndarray, polygon: Union[Polygon, np.ndarray]) -> np.ndarray

• Description: Applies a perspective transformation to the input image based on a quadrilateral defined by four points. The function automatically sorts the points in the following order: the first point is the top-left, the second is the top-right, the third is the bottom-right, and the fourth is the bottom-left. The target size of the transformed image is determined by the width and height of the minimum rotated bounding box of the polygon.

• Parameters

  • img (np.ndarray): The input image to be transformed.
  • polygon (Union[Polygon, np.ndarray]): A polygon object containing the four points that define the transformation.

• 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.