本文介绍了将 Opencv 矩阵旋转 90、180、270 度的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!
问题描述
我正在从网络摄像头捕获图像,我需要将其旋转直角.我发现自己有这些功能:
I'm capturing image from webcam and I need to rotate it by right angle. I found myself theese functions:
getRotationMatrix2D
- 创建旋转矩阵(不管它是什么)transform
- 通过旋转矩阵将一个矩阵转换为另一个矩阵
getRotationMatrix2D
- to create rotation matrix (whatever it is)transform
- transform one matrix to another by rotation matrix
但是,除了黑色区域,我什么也没有.这是我的代码:
But, I don't get anything but black area. This is my code:
if(rotate_button.click%4>0) {
double angle = (rotate_button.click%4)*90; //button increments its click by 1 per click
Mat transform_m = getRotationMatrix2D(Point(cam_frame_width/2, cam_frame_height/2), angle, 1); //Creating rotation matrix
Mat current_frame;
transform(cam_frame, current_frame, transform_m); //Transforming captured image into a new one
cam_frame = Mat((int)current_frame.cols,(int)current_frame.rows, cam_frame_type) = Scalar(0,128,0); //resizing captured matrix, so I can copy the resized one on it
current_frame.copyTo(cam_frame); //Copy resized to original
}
输出只是黑屏.
推荐答案
Use warpAffine.:
Use warpAffine.:
试试:
Point2f src_center(source.cols/2.0F, source.rows/2.0F);
Mat rot_mat = getRotationMatrix2D(src_center, angle, 1.0);
Mat dst;
warpAffine(source, dst, rot_mat, source.size());
dst
是最终图像
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