@book{Gonzalez2018,
  title={Digital Image Processing 4th Edition},
  author={Rafael C. Gonzalez, Richard E. Woods},
  year={2018},
  publisher={Pearson}
}

@misc{lcs435lab,
  title={CS425 Lab: Intensity Transformations and Spatial Filtering},
  url={http://www.cs.uregina.ca/Links/class-info/425/Lab3/}
}

@misc{theailearner,
  title={Contrast Stretching},
  url={https://theailearner.com/2019/01/30/contrast-stretching/}
}