




'''simple docstring'''






import copy
import os

import cva
import numpy as np
from matplotlib import pyplot as plt




class 		a__    :





							'''simple docstring'''






							def __init__(		self       )	->							Tuple:
														lowerCAmelCase__	       =     ''''''
														lowerCAmelCase__	       =     ''''''
														lowerCAmelCase__	       =     []
														lowerCAmelCase__	       =     0
														lowerCAmelCase__	       =     2_56
														lowerCAmelCase__	       =     0
														lowerCAmelCase__	       =     0
														lowerCAmelCase__	       =     0
														lowerCAmelCase__	       =     0







							def   __SCREAMING_SNAKE_CASE							(		self ,   lowerCamelCase_       )	->							List[str]:
														lowerCAmelCase__	       =     cva.imread(lowerCamelCase_ ,   0       )
														lowerCAmelCase__	       =     copy.deepcopy(self.img       )
														lowerCAmelCase__       , lowerCAmelCase__       , lowerCAmelCase__	       =     plt.hist(self.img.ravel() ,   2_56 ,   [0, 2_56] ,   label='''x'''       )
														lowerCAmelCase__	       =     np.sum(lowerCamelCase_       )
														for i in range(len(lowerCamelCase_       )       ):
																					lowerCAmelCase__	       =     x[i] / self.k
																					self.sk += prk
																					lowerCAmelCase__	       =     (self.L - 1) * self.sk
																					if self.rem != 0:
																												lowerCAmelCase__	       =     int(last % last       )
																					lowerCAmelCase__	       =     int(last + 1 if self.rem >= 0.5 else last       )
																					self.last_list.append(lowerCamelCase_       )
																					lowerCAmelCase__	       =     int(np.ma.count(self.img       ) / self.img[1].size       )
																					lowerCAmelCase__	       =     self.img[1].size
														for i in range(self.number_of_cols       ):
																					for j in range(self.number_of_rows       ):
																												lowerCAmelCase__	       =     self.img[j][i]
																												if num != self.last_list[num]:
																																			lowerCAmelCase__	       =     self.last_list[num]
														cva.imwrite('''output_data/output.jpg''' ,   self.img       )







							def   __SCREAMING_SNAKE_CASE							(		self       )	->							Union[str, Any]:
														plt.hist(self.img.ravel() ,   2_56 ,   [0, 2_56]       )







							def   __SCREAMING_SNAKE_CASE							(		self       )	->							Union[str, Any]:
														cva.imshow('''Output-Image''' ,   self.img       )
														cva.imshow('''Input-Image''' ,   self.original_image       )
														cva.waitKey(50_00       )
														cva.destroyAllWindows()


if __name__ == "__main__":
		__UpperCAmelCase       =							os.path.join(os.path.basename(__file__), '''image_data/input.jpg''')
		__UpperCAmelCase       =							ConstantStretch()
		stretcher.stretch(file_path)
		stretcher.plot_histogram()
		stretcher.show_image()



'''simple docstring'''






from __future__ import annotations




class 		a__    :





							'''simple docstring'''






							def __init__(		self ,   lowerCamelCase_       )	->							None:
														lowerCAmelCase__	       =     order

														# a_{0} ... a_{k}
														lowerCAmelCase__	       =     [1.0] + [0.0] * order
														# b_{0} ... b_{k}
														lowerCAmelCase__	       =     [1.0] + [0.0] * order

														# x[n-1] ... x[n-k]
														lowerCAmelCase__	       =     [0.0] * self.order
														# y[n-1] ... y[n-k]
														lowerCAmelCase__	       =     [0.0] * self.order







							def   __SCREAMING_SNAKE_CASE							(		self ,   lowerCamelCase_ ,   lowerCamelCase_       )	->							None:
														if len(lowerCamelCase_       ) < self.order:
																					lowerCAmelCase__	       =     [1.0, *a_coeffs]

														if len(lowerCamelCase_       ) != self.order + 1:
																					lowerCAmelCase__	       =     (
																					    F"""Expected a_coeffs to have {self.order + 1} elements """
																					    F"""for {self.order}-order filter, got {len(lowerCamelCase_       )}"""
																					)
																					raise ValueError(lowerCamelCase_       )

														if len(lowerCamelCase_       ) != self.order + 1:
																					lowerCAmelCase__	       =     (
																					    F"""Expected b_coeffs to have {self.order + 1} elements """
																					    F"""for {self.order}-order filter, got {len(lowerCamelCase_       )}"""
																					)
																					raise ValueError(lowerCamelCase_       )

														lowerCAmelCase__	       =     a_coeffs
														lowerCAmelCase__	       =     b_coeffs







							def   __SCREAMING_SNAKE_CASE							(		self ,   lowerCamelCase_       )	->							float:
														lowerCAmelCase__	       =     0.0

														# Start at index 1 and do index 0 at the end.
														for i in range(1 ,   self.order + 1       ):
																					result += (
																					    self.b_coeffs[i] * self.input_history[i - 1]
																					    - self.a_coeffs[i] * self.output_history[i - 1]
																					)

														lowerCAmelCase__	       =     (result + self.b_coeffs[0] * sample) / self.a_coeffs[0]

														lowerCAmelCase__	       =     self.input_history[:-1]
														lowerCAmelCase__	       =     self.output_history[:-1]

														lowerCAmelCase__	       =     sample
														lowerCAmelCase__	       =     result

														return result