吐嘈OpenCV的图像旋转功能 >_<7
實在出乎我的意料!OpenCV竟然連這么簡單的功能都沒有封裝!還要讓本大爺自己動手寫!強烈要求OpenCV下一個版本添加本功能!
函數功能和這個網頁一樣,只不過這個作者寫的太糟了,我把它變得簡潔了一點 ^_^
1 void rotate(const Mat& src, Mat& dst, float angle) 2 { 3 CV_Assert(!src.empty()); 4 5 float radian = angle /180.0 * PI; 6 7 int uniSize = max(src.cols, src.rows) * 2; 8 int dx = (uniSize - src.cols) / 2; 9 int dy = (uniSize - src.rows) / 2; 10 11 copyMakeBorder(src, dst, dy, dy, dx, dx, BORDER_CONSTANT); 12 13 //旋轉中心 14 Point2f center(dst.cols/2, dst.rows/2); 15 Mat affine_matrix = getRotationMatrix2D( center, angle, 1.0 ); 16 17 warpAffine(dst, dst, affine_matrix, dst.size()); 18 19 float sinVal = fabs(sin(radian)); 20 float cosVal = fabs(cos(radian)); 21 22 //旋轉后的圖像大小 23 Size targetSize(src.cols * cosVal + src.rows * sinVal, 24 src.cols * sinVal + src.rows * cosVal); 25 26 //剪掉四周边框 27 int x = (dst.cols - targetSize.width) / 2; 28 int y = (dst.rows - targetSize.height) / 2; 29 30 Rect rect(x, y, targetSize.width, targetSize.height); 31 dst = Mat(dst, rect); 32 }