Digital watermarking is the act of hiding a message related to a digital signal (i.e. an. image, song, video) within the signal itseclosely related to lf. It is a concept. steganography, in that they both hide a message inside a digital signal. However, what. separates them is their goal.
Wiktionary(0.00 / 0 votes)Rate this definition: 1  extrude(Verb) To push or thrust out. 2  extrude(Verb) To form or shape (a metal, plastic etc.) by forcing it through a die or an opening.
Extrusion is a process used to create objects of a fixed cross-sectional profile. A material is pushed through a die of the desired cross-section. Aluminium is the most commonly extruded material. 2  Aluminium can be hot or cold extruded. 3  If it is hot extruded it is heated to 575 to 1100 Â°F (300 to 600 Â°C). 4  Examples of products include profiles for tracks, frames, rails, mullions, and heat sinks.