Cool stuff for libpipi

Here are a few links to excellent research stuff that we need to implement.

• ​Kernel Regression for Image Processing and Reconstruction - Gaussian noise removal, film grain reduction, image upscale
• ​Salt-and-Pepper Noise Removal by Median-type Noise Detectors and Edge-preserving Regularization - awesome salt-and-pepper noise removal

Unsorted links:

• ​The Convex Hull of a 2D Point Set or Polygon
• ​RGB versus CMYK
• ​An Introduction to Smoothing
• ​Converting Between YUV and RGB
• ​fourcc.org
• ​Colour Space Conversions FAQ
• ​Efficiently Implementing Dilate and Erode Image Functions