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Opencv仿射和透射变换的坐标变换

Submitted by hubdog on Fri, 2019-02-22 09:15

OpenCV里面通过getAffineTransform或者findTransformECC获取变形矩阵的饿时候会得到一个2x3或者3x3的变形矩阵,分别对应仿射矩阵和透视矩阵.

变形的时候如果想要算出原始图像坐标到目标图像的坐标的时候,可以使用下面方法计算

  1. 	if (matrixSize == 3)
  2. 	{
  3. 		//计算透视变换坐标
  4. 		double w= warp_matrix.at<float>(2, 0)*orgX + warp_matrix.at<float>(2, 1)*orgY + warp_matrix.at<float>(2, 2);
  5.  
  6. 		targetX = (warp_matrix.at<float>(0, 0)*orgX + warp_matrix.at<float>(0, 1)*orgY + warp_matrix.at<float>(0, 2))/w;
  7. 		targetY = (warp_matrix.at<float>(1, 0)*orgX + warp_matrix.at<float>(1, 1)*orgY + warp_matrix.at<float>(1, 2))/w;
  8. 	}
  9. 	else {
  10. 		//计算仿射变换坐标
  11. 		targetX = warp_matrix.at<float>(0, 0)*orgX + warp_matrix.at<float>(0, 1)*orgY + warp_matrix.at<float>(0, 2);
  12. 		targetY = warp_matrix.at<float>(1, 0)*orgX + warp_matrix.at<float>(1, 1)*orgY + warp_matrix.at<float>(1, 2);
  13. 	}

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