For recognition, the front or trailing edge of projection of binary image on horizontal axis basically shows linear shape, so least square theory is applied in tilt correction.
识别过程中，数码管二值化后的图像在水平轴上的投影，其上升沿或下降沿基本呈现直线的形状，尝试把最小二乘法应用于倾斜校正。
During side face image detection, the person's face area is located by use of integration projection in the pre-disposed binary image.
在侧面人脸图像检测过程中，利用积分投影法对预处理后的二值化侧面人脸图像进行人脸区域的定位。
Firstly, we should remove hair in binary image, and then locate eyes' position with the method of gray projection and area growth.
首先在二值图像上去掉头发，利用灰度投影和区域生长的方法分别粗定位和精确定位眼睛位置。
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