这种方法使用图像分析来确定纸浆、纸张和纸板中的污垢水平 在0.02至3.0 mm2的物理面积范围内报告的污垢斑点的等效黑色面积（EBA），单位为百万分之几，以及每平方米样品的污垢斑点数量。使用本方法中规定的算法，最大污垢尺寸限制为3.0 mm2。扩展到其他斑点尺寸（例如大于3.0 mm2in的斑点 物理面积），可能需要对设备、计算程序或两者进行更改，本试验方法不包括这些内容。 该方法不能用于物理面积测量，因为它不能正确测量该测量模式下的污垢斑点。

This method uses image analysis to determine the level of dirt in pulp, paper, and paperboard in terms of Equivalent Black Area (EBA) of dirt specks within the physical area range of 0.02 to 3.0 mm2reported in parts per million as well as the number of dirt specks per square meter of sample. Using the algorithm prescribed in this method, the maximum dirt size is limited to 3.0 mm2. Extension to other speck sizes (for example those greater than 3.0 mm2in physical area), may require changes in equipment, calculation procedures, or both, and is not covered in this test method. This method cannot be used for physical area measurements since it does not correctly measure the dirt specks for that mode of measurement.