



from __future__ import annotations

from typing import Any



class 		_lowercase		:

   def __init__(   self      :							str				, __lowerCAmelCase      :							Any				, __lowerCAmelCase      :							Any				)							->					None:  # noqa: A002


    """simple docstring"""






    a							=		item
    a							=		next



class 		_lowercase		:

   def __init__(   self      :							Union[str, Any]				)							->					None:


    """simple docstring"""






    a							=		None
    a							=		0

   def 		A				(   self      :							Tuple				, __lowerCAmelCase      :							Any				)							->					None:


    """simple docstring"""






    a							=		Node(__lowerCAmelCase				, self.head				)
    self.size += 1

   def 		A				(   self      :							List[Any]				)							->					Any:


    """simple docstring"""






    if self.head is None:
     return None
    else:
     a							=		self.head.item
     a							=		self.head.next
     self.size -= 1
     return item

   def 		A				(   self      :							Union[str, Any]				)							->					bool:


    """simple docstring"""






    return self.head is None

   def __str__(   self      :							Optional[Any]				)							->					str:


    """simple docstring"""






    if self.is_empty():
     return ""
    else:
     a							=		self.head
     a							=		""
     a							=		[]
     while iterate:
      item_list.append(str(iterate.item				)				)
      a							=		iterate.next

     a							=		" --> ".join(__lowerCAmelCase				)

     return item_str




   def __len__(   self      :							Any				)							->					int:


    """simple docstring"""






    return self.size




import math
import os

import cva
import numpy as np

lowercase_									=    255.0
def 		_snake_case(       SCREAMING_SNAKE_CASE__     :      float       ,     SCREAMING_SNAKE_CASE__     :      float )				-> float:





    '''simple docstring'''






    A__        =  np.mean((original - contrast) ** 2 )
    if mse == 0:
        return 100

    return 20 * math.logaa(PIXEL_MAX / math.sqrt(SCREAMING_SNAKE_CASE__ ) )
def 		_snake_case(       )				-> None:





    '''simple docstring'''






    A__        =  os.path.dirname(os.path.realpath(SCREAMING_SNAKE_CASE__ ) )
    # Loading images (original image and compressed image)
    A__        =  cva.imread(os.path.join(SCREAMING_SNAKE_CASE__       ,     'image_data/original_image.png' ) )
    A__        =  cva.imread(os.path.join(SCREAMING_SNAKE_CASE__       ,     'image_data/compressed_image.png' )       ,     1 )

    A__        =  cva.imread(os.path.join(SCREAMING_SNAKE_CASE__       ,     'image_data/PSNR-example-base.png' ) )
    A__        =  cva.imread(
        os.path.join(SCREAMING_SNAKE_CASE__       ,     'image_data/PSNR-example-comp-10.jpg' )       ,     1 )

    # Value expected: 29.73dB
    print('-- First Test --' )
    print(f'PSNR value is {peak_signal_to_noise_ratio(SCREAMING_SNAKE_CASE__       ,     SCREAMING_SNAKE_CASE__ )} dB' )

    # # Value expected: 31.53dB (Wikipedia Example)
    print('\n-- Second Test --' )
    print(f'PSNR value is {peak_signal_to_noise_ratio(SCREAMING_SNAKE_CASE__       ,     SCREAMING_SNAKE_CASE__ )} dB' )


if __name__ == "__main__":
     main()

