opencv 图像增强

    Mat src= imread( "D:\\OCR\\Debug\\Temp\\Rects\\wholeMat_00191_0_0.jpg");
    Mat dest;
    Mat kern = (Mat_<char>(3,3) << 0, -1 ,0,
        -1, 5, -1,
        0, -1, 0);
    filter2D(src,dest,src.depth(),kern);  
    imshow("src",src);
    imshow("dest",dest);
    imwrite("D:\\dest.jpg",dest);
    waitKey(0);