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Coding tree unit
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<p>Coding tree unit (CTU) is the basic processing unit of the <a href="/facts/High_Efficiency_Video_Coding/6gp7DC1a">High Efficiency Video Coding</a> (HEVC) video standard and conceptually corresponds in structure to <a href="/facts/Macroblock/L7XPoRNP">macroblock</a> units that were used in several previous video standards. CTU is also referred to as largest coding unit (LCU). </p><p>A CTU can be between 16×16 pixels and 64×64 pixels in size with a larger size usually increasing coding efficiency. The first video standard that uses CTUs is HEVC/H.265 which became an <a href="/facts/ITU-T/9nJwkPYx">ITU-T</a> standard on April 13, 2013. </p>