Secret texts buried in a picture of your dog? Image Analyst Dr. Mike Pound explains the art of steganography in digital images. The Problem with JPEG: https://www.youtube.com/watch?v=yBX8GFqt6GA The Bayer Filter: https://www.youtube.com/watch?v=LWxu4rkZBLw Super Computer & the Milky Way: https://www.youtube.com/watch?v=5KEhhW8TOGk JPEG Discrete Cosine Transform (DCT): https://www.youtube.com/watch?v=Q2aEzeMDHMA http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com/