Reliable data encoding inside JPEG images

Transferring machine-readable data inside jpeg images is a non-trivial task. There are two approaches to solving it - file metadata and changing the image itself. However, it is often not possible to use metadata. For example, if the image is part of an animation or metadata was deleted when uploading to the Internet. In this case, the only solution is to encode the data in pixels of the image. The article describes a method for encoding data into pixels of an image with high resistance to JPEG compression.