The Six Sigma Black Belt should understand the concepts of randomization and blocking. 西格玛黑带应了解随机化和分块的概念。
However, in the compression process of blocking image data, severe boundary artifact will be produced because of boundary extension and coefficient quantification. 但在分块处理过程中，由于小波变换的边界扩展及系数量化等原因会产生较严重的边缘赝像效应。
