全自动阈值adaptiveThreshold()

Mat grab = imread("image_grab\\grab_bak.bmp");
Mat g_gray;
cvtColor(grab, g_gray, COLOR_BGR2GRAY);
adaptiveThreshold(g_gray, g_dts, 255, ADAPTIVE_THRESH_MEAN_C, THRESH_BINARY, 7, -2);
void adaptiveThreshold(
    InputArray src,         //需要进行二值化的图像
    OutputArray dst,        //输出图像的二值图像;
    double maxValue,        //非零值, 用于对满足条件的阈值进行赋值;
    int adaptiveMethod,     //选择一种自适应阈值算法: ADAPTIVE_THRESH_MEAN_C   
                            //                    ADAPTIVE_THRESH_GAUSSIAN_C
    int thresholdType,      //二值化类型:    THRESH_BINARY   
                            //             THRESH_BINARY_INV
    int blockSize,          //参与计算的像素的领域范围使用奇数;
    double n);              //计算过程中容忍程度;