opencv_17_翻转与旋转

一、图像翻转

1）void flip_test(Mat& image);

2）void ColorInvert::flip_test(Mat& image) {

Mat dst;

//flip(image, dst, 0); //上下翻转

flip(image, dst, 1); //左右翻转

// flip(image, dst, -1); //180度翻转

imshow("图像旋转", dst);

}

二、图像旋转

coInvert.rotate(src);

void ColorInvert::rotate(Mat& image) {

Mat dst,M;

int w = image.cols;

int h = image.rows;

M = getRotationMatrix2D(Point2f(w / 2, h / 2), 45, 1.0);

double cos = abs(M.at<double>(0, 0));

double sin = abs(M.at<double>(0, 1));

int nw = cos * w + sin * h;

int nh = sin * w + cos * h;

M.at<double>(0, 2) += (nw / 2 - w / 2);

M.at<double>(1, 2) += (nh / 2 - h / 2);

warpAffine(image, dst, M, Size(nw, nh), INTER_LINEAR, 0, Scalar(255, 255, 0));

imshow("旋转演示", dst);

}

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