Guided Image Filtering

https://link.springer.com/content/pdf/10.1007/978-3-642-15549-9_1.pdf

@inproceedings{he2010guided,
  title={Guided image filtering},
  author={He, Kaiming and Sun, Jian and Tang, Xiaoou},
  booktitle={European conference on computer vision},
  pages={1--14},
  year={2010},
  organization={Springer}
}

Introduced guided image filtering, for using a separate image as source for the weights chosed for a filter that is applied to the actual image.