


import numpy as np
from cva import COLOR_BGR2GRAY, cvtColor, imread, imshow, waitKey

from digital_image_processing.filters.convolve import img_convolve
def 							UpperCamelCase_  (				__snake_case			:						Optional[int]     )->      str:




      '''simple docstring'''
      __magic_name__ 		=			np.array([[-1, 0, 1], [-2, 0, 2], [-1, 0, 1]]     )
      __magic_name__ 		=			np.array([[1, 2, 1], [0, 0, 0], [-1, -2, -1]]     )

      __magic_name__ 		=			np.abs(img_convolve(UpperCamelCase_	,			UpperCamelCase_     )     )
      __magic_name__ 		=			np.abs(img_convolve(UpperCamelCase_	,			UpperCamelCase_     )     )
      # modify the pix within [0, 255]
      __magic_name__ 		=			dst_x * 2_55 / np.max(UpperCamelCase_     )
      __magic_name__ 		=			dst_y * 2_55 / np.max(UpperCamelCase_     )

      __magic_name__ 		=			np.sqrt((np.square(UpperCamelCase_     )) + (np.square(UpperCamelCase_     ))     )
      __magic_name__ 		=			dst_xy * 2_55 / np.max(UpperCamelCase_     )
      __magic_name__ 		=			dst_xy.astype(np.uinta     )

      __magic_name__ 		=			np.arctana(UpperCamelCase_	,			UpperCamelCase_     )
      return dst, theta


if __name__ == "__main__":
     # read original image
     UpperCamelCase :				Optional[Any]						    =       imread('''../image_data/lena.jpg''')
     # turn image in gray scale value
     UpperCamelCase :				Union[str, Any]						    =       cvtColor(img, COLOR_BGR2GRAY)

     UpperCamelCase :				Any						    =       sobel_filter(gray)

     # show result images
     imshow('''sobel filter''', sobel_grad)
     imshow('''sobel theta''', sobel_theta)
     waitKey(0)





def 							UpperCamelCase_  (				__snake_case			:						list[int]     )->      tuple[int, int]:




						'''simple docstring'''
						# base case
						if len(__snake_case     ) == 1:
												return a[0], a[0]
						else:
												# split A into half.
												__magic_name__ 		=			a[: len(__snake_case     ) // 2]
												__magic_name__ 		=			a[len(__snake_case     ) // 2 :]

												# 2 sub problems, 1/2 of original size.
												__magic_name__		,			__magic_name__ 		=			max_difference(__snake_case     )
												__magic_name__		,			__magic_name__ 		=			max_difference(__snake_case     )

												# get min of first and max of second
												# linear time
												__magic_name__ 		=			min(__snake_case     )
												__magic_name__ 		=			max(__snake_case     )

												# 3 cases, either (small1, big1),
												# (min_first, max_second), (small2, big2)
												# constant comparisons
												if biga - smalla > max_second - min_first and biga - smalla > biga - smalla:
																		return smalla, biga
												elif biga - smalla > max_second - min_first:
																		return smalla, biga
												else:
																		return min_first, max_second


if __name__ == "__main__":
					import doctest

					doctest.testmod()

