In signal processing, particularly digital image processing, ringing artifacts are artifacts that appear as spurious signals near sharp transitions in a signal. Visually, they appear as bands or "ghosts" near edges; audibly, they appear as "echos" near transients, particularly sounds from percussion instruments; most noticeable are the pre-echos. The term "ringing" is because the output signal oscillates at a fading rate around a sharp transition in the input, similar to a bell after being struck. As with other artifacts, their minimization is a criterion in filter design.
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Famous quotes containing the word ringing:
“When we reached the lake, about half past eight in the evening, it was still steadily raining, and harder than before; and, in that fresh, cool atmosphere, the hylodes were peeping and the toads ringing about the lake universally, as in the spring with us. It was as if the season had revolved backward two or three months, or I had arrived at the abode of perpetual spring.”
—Henry David Thoreau (1817–1862)