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Mat gray, binary;

cvtColor(src, gray, COLOR_BGR2GRAY);

threshold(gray, binary, 0, 255, THRESH_BINARY_INV | THRESH_OTSU);

imshow("binary", binary);

imwrite("D:/binary_text.png", binary);

vector points;
findNonZero(binary, points);
RotatedRect box = minAreaRect(points);

double angle = box.angle;

if (angle < -45.)

    angle += 90.;

printf("angle : %.2f\n", angle);


Point2f vertices[4];

box.points(vertices);

for (int i = 0; i < 4; ++i)

    line(src, vertices[i], vertices[(i + 1) % 4], Scalar(0, 0, 255), 2);

imshow("box", src);

imwrite("D:/box_text.png", src);


**Mat rot_mat = getRotationMatrix2D(box.center, angle, 1);
Mat rotated;
warpAffine(src, rotated, rot_mat, src.size(), cv::INTER_CUBIC, 0, Scalar(255, 255, 255));**

//bitwise_not(rotated, rotated);

imshow("deskew-demo", rotated);