C++ OpenCV findHomography错误

我正在使用OpenCV的冲浪特征检测来比较两幅图像。 当我选择两个相同的图像（有时选择相同的图像）时，我得到以下结果：

 OpenCV Error: Assertion failed (CV_IS_MAT(imagePoints) && CV_IS_MAT(objectPoints)) in cvFindHomography, file /home/OpenCV/OpenCV-2.4.3/modules/calib3d/src/fundam.cpp, line 232 
Qt has caught an exception thrown from an event handler. Throwing 
exceptions from an event handler is not supported in Qt. You must 
reimplement QApplication::notify() and catch all exceptions there. 

terminate called after throwing an instance of 'cv::Exception' 
what(): /home/OpenCV/OpenCV-2.4.3/modules/calib3d/src/fundam.cpp:232: error: (-215) CV_IS_MAT(imagePoints) && CV_IS_MAT(objectPoints) in function cvFindHomography 

Le programme s'est terminé subitement

第二次使用两个不同的图像执行代码时表示：

what(): /home/OpenCV/OpenCV-2.4.3/modules/calib3d/src/fundam.cpp:235: error: (-215) count >= 4 in function cvFindHomography

---

每次我都用不同的图像重复执行多次，一些测试给了我期望的结果

看起来您没有足够的点来计算单应性。要做到这一点，您至少需要4个点，并且匹配的点数量必须相等（

imagePoints

和

objectPoints

）。有关说明，请参阅