Opencv findhomography

1. What does cv2 findHomography do?
2. How does OpenCV findHomography work?
3. How do you find the homography between two images?
4. What is mask in findHomography?

What does cv2 findHomography do?

cv. findHomography() returns a mask which specifies the inlier and outlier points.

How does OpenCV findHomography work?

the OpenCV findhomography come on helps in transforming an image that is present in the form of a three by three matrix and Maps the specific points present in that image to the corresponding points that are present in another image that has been provided.

How do you find the homography between two images?

The homography can be estimated using for instance the Direct Linear Transform (DLT) algorithm (see 1 for more information). As the object is planar, the transformation between points expressed in the object frame and projected points into the image plane expressed in the normalized camera frame is a homography.

What is mask in findHomography?

The mask returned by findHomography is an 8-bit, single-channel cv::Mat (or std::vector<uchar> , if you prefer) containing either 0 or 1 indicating the outlier status. EDIT: You access each element of the mask by calling . at<double> , which is leading to the confusing output.