PPM是自适应统计数据压缩技术，基于上下文建模和预测。
PPM is an adaptive statistical data compression technique based on context modeling and prediction.
SCMPPM结合了称为结构上下文建模(SCM)的技术和PPM压缩方案。
SCMPPM combines a technique called structure context modeling (SCM) with the PPM compression scheme.
针对SPIHT编码过程中熵编码简单的上下文建模过程，提出了一种改进的方法。
An improved method has been proposed for the simple context modeling procedure in the entropy coding in SPIHT.
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