A facsimile compression technique that codes distances between changing pixels on two adjacent scan lines. 一种传真压缩技术，即对两个相邻扫描线上变化象素之间的距离进行编码。
Balling,which occurs at the end of the scanning line,is caused by the dissymmetric temperature field and the great temperature gradient. 激光扫描线间的耦合作用使端点球化现象随扫描线的增加而逐渐显著。
