这些变量存储了每一列的 period 值和背景颜色。
These variables store the value of the period for each column and the background color for each column.
对笔迹图像的预处理过程包括纸张背景颜色去除，狄度化、消噪和二值化，归一化等步骤。
The paper is divided into some steps such as pre-processing to remove background color, gray, de-noising, binarization and normalized.
返回一个代表当前背景颜色的COLORREF值。如果这个值是- 1，则控件正使用系统的颜色作为背景色。
COLORREF value that represents the current background color. If this value is -1, the control is using the system color for the background color.
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