本推荐国际标准规定了一种可替代的分组编码算法，该算法可以用来代替Rec中规定的分组编码算法。ITU-T T.800 ISO/IEC 15444-1。这种替代分组编码算法以稍微降低编码效率为代价，提供了吞吐量的显著增加，同时a)允许使用Rec中指定的分组编码算法的码流进行数学无损转码。那个？和b)保留Rec中指定的码流语法和特征。ITU-T T.800 ISO/IEC 15444-1。 建议ITU-T T.814（2019）是与ISO/IEC 15444-15:20 19的通用文本，两者都是第一版。

This Recommendation International Standard specifies an alternate block-coding algorithm that can be used in place of the block-coding algorithm specified in Rec. ITU-T T.800 | ISO/IEC 15444-1. This alternate block-coding algorithm offers a significant increase in throughput at the expense of slightly reduced coding efficiency, while a) allowing mathematically lossless transcoding to and from codestreams that use the block-coding algorithm specified in Rec. ITU？T T.800 | ISO/IEC 15444-1, and b) preserving codestream syntax and features specified in Rec. ITU-T T.800 | ISO/IEC 15444-1.
Recommendation ITU-T T.814 (2019) is a common text with ISO/IEC 15444-15:2019, both in their first edition.