findHomography not working in OpenCV 3.0

Question

I have been working on an image stitching project using OpenCV 3.0. I use the findHomography function like so:

findHomography(imageOnePoints, imageTwoPoints, CV_RANSAC);

but when I try to compile my code, I am returned the following error messages:

stitch.cpp:111:75: error: ‘CV_RANSAC’ was not declared in this scope
 Mat homographyMatrix = findHomography(imageOnePoints, imageTwoPoints, CV_RANSAC);

stitch.cpp:111:84: error: ‘findHomography’ was not declared in this scope
 Mat homographyMatrix = findHomography(imageOnePoints, imageTwoPoints, CV_RANSAC);

I have already declared that I am using "namespace cv" so I do not need the preceeding "cv::". I am not sure what the problem is. Any advice on these errors would be greatly appreciated. Thank you!

Answer 1

结果发现findHomography的头文件丢失了：

#include "opencv2/calib3d/calib3d.hpp"

Answer 2

Latest OpenCV version, CV_RANSAC is renamed to RANSAC.

just use H = findHomography(ref, tst, RANSAC)

This should work.

Answer 3

Q1. CV_RANSAC was not declared.

Solution: CV_RANSAC => RANSAC

Q2. findHomography was not declared.

Solution: #include <opencv2/opencv.hpp> would be enough for most cases.

For this specific question you can also use #include <opencv2/calib3d/calib3d.hpp>