Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Block-matching and 3D filtering
open-in-new
<p>Block-matching and 3D filtering (BM3D) is a 3-D <a href="/facts/Block-matching_algorithm/UulHuNX6">block-matching algorithm</a> used primarily for <a href="/facts/Noise_reduction/9jrDQnAN">noise reduction in images</a>. It is one of the expansions of the non-local means methodology. There are two cascades in BM3D: a hard-thresholding and a <a href="/facts/Wiener_filter/oGWdBTYa">Wiener filter</a> stage, both involving the following parts: grouping, <a href="/facts/Collaborative_filtering/NhSFypjN">collaborative filtering</a>, and aggregation. This algorithm depends on an augmented representation in the transformation site. </p>