imwarp_quadrangle

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

• Description: Apply perspective transformation to the input image using the 4 points defined by the given polygon. The function automatically sorts the four points in the order: the first point is the top-left corner, the second point is the top-right corner, the third point is the bottom-right corner, and the fourth point is the bottom-left corner. The target size of the image transformation is determined by the width and height of the minimum bounding rectangle of the polygon.

• Parameters:

  • img (np.ndarray): Input image to be transformed.
  • polygon (Union[Polygon, np.ndarray]): Polygon object containing the four points defining the transformation.

• Returns:

  • np.ndarray: Transformed image.

• Example:

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

  

  The green box in the above figure represents the original polygon range.