开放简历.我如何将点和矩阵相乘 (CvMat) [英] OpenCV. How do I multiply point and matrix (CvMat)

问题描述

我有用于旋转的矩阵:

CvMat* rot_mat = cvCreateMat(2, 3, CV_32FC1);
cv2DRotationMatrix(center, angle, scale, rot_mat);
...

该矩阵用于图像操作.

cvWarpAffine(..., ..., rot_mat, ..., ...);

我必须知道，这个矩阵应该如何影响精确的像素 - 应该传输的位置.

I have to know, how this matrix should affect exact pixel - location it should be transfered.

如何将 2D 点(像素位置)和我的矩阵相乘以找出应将像素转移到何处?

How can I multiply 2D point (pixel location) and my matrix to find out where pixel should be transferred?

推荐答案

我为此实现了一些愚蠢的代码.我想应该有更复杂的解决方案:

I have implemented some silly code for that. I guess there should be more sophisticated solution:

CvMat* rot_mat; 
CvPoint* p;

...

float* data = (float*)(rot_mat->data.ptr);  
float newX = data[0] * p->x + data[1] * p->y + data[2]; 
float newY = data[3] * p->x + data[4] * p->y + data[5]; 

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