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. n. 1. the act or process of extruding.2. (Geological Science). a. the movement of magma onto the surface of the earth through volcano craters and cracks in the earth's crust, forming igneous rock.xÂ·truÂ·sion. n. 1. The act or process of pushing or thrusting out. 2. The act or process of shaping by forcing through a die.