说明：  非常重要的直线检测代码，不只是freeman和活肤，还有其他的，很重要，非常重要的直线检测代码，不只是freeman和活肤，还有其他的，很重要
(Very important straight line detection code, not just freeman and revitalize, there are other, very important! Very important straight line detection code, not just freeman and revitalize, there are other, very important! )