这个实参可与一个数字联合使用，以告知格式化程序在小数点前有多少个数位。
This argument can be used with a number, which tells the formatter how many digits to use before the decimal point.
提出了一种基于形态膨胀运算的对子带间重要系数位置信息进行联合编码的新型小波图像压缩编码算法。
A new wavelet image compression algorithm was proposed based on morphological dilation and the positional information of the important coefficient couplet belt.
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