Hi, I'm trying to stitch two images together, using the OpenCV Java API. I have been following this C++ tutorial here http://ramsrigoutham.com/2012/11/22/panorama-image-stitching-in-opencv/ ...but I'm stuck at this line:
cv::Mat half(result,cv::Rect(0,0,image2.cols,image2.rows));
I'm not sure what that is doing (I'm very new to C++), and I can't find a corresponding half() function in the OpenCV Java API. My code is as follows:
public class ImageStitching {
static Mat image1;
static Mat image2;
static FeatureDetector fd;
static DescriptorExtractor fe;
static DescriptorMatcher fm;
public static void initialise(){
fd = FeatureDetector.create(FeatureDetector.FAST);
fe = DescriptorExtractor.create(DescriptorExtractor.ORB);
fm = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE);
//images
image1 = Highgui.imread("room2.jpg");
image2 = Highgui.imread("room3.jpg");
//structures for the keypoints from the 2 images
MatOfKeyPoint keypoints1 = new MatOfKeyPoint();
MatOfKeyPoint keypoints2 = new MatOfKeyPoint();
//structures for the computed descriptors
Mat descriptors1 = new Mat();
Mat descriptors2 = new Mat();
//structure for the matches
MatOfDMatch matches = new MatOfDMatch();
//getting the keypoints
fd.detect(image1, keypoints1);
fd.detect(image1, keypoints2);
//getting the descriptors from the keypoints
fe.compute(image1, keypoints1, descriptors1);
fe.compute(image2,keypoints2,descriptors2);
//getting the matches the 2 sets of descriptors
fm.match(descriptors2,descriptors1, matches);
//turn the matches to a list
List<DMatch> matchesList = matches.toList();
Double maxDist = 0.0; //keep track of max distance from the matches
Double minDist = 100.0; //keep track of min distance from the matches
//calculate max & min distances between keypoints
for(int i=0; i<keypoints1.rows();i++){
Double dist = (double) matchesList.get(i).distance;
if (dist<minDist) minDist = dist;
if(dist>maxDist) maxDist=dist;
}
System.out.println("max dist: " + maxDist );
System.out.println("min dist: " + minDist);
//structure for the good matches
LinkedList<DMatch> goodMatches = new LinkedList<DMatch>();
//use only the good matches (i.e. whose distance is less than 3*min_dist)
for(int i=0;i<descriptors1.rows();i++){
if(matchesList.get(i).distance<3*minDist){
goodMatches.addLast(matchesList.get(i));
}
}
//structures to hold points of the good matches (coordinates)
LinkedList<Point> objList = new LinkedList<Point>(); // image1
LinkedList<Point> sceneList = new LinkedList<Point>(); //image 2
List<KeyPoint> keypoints_objectList = keypoints1.toList();
List<KeyPoint> keypoints_sceneList = keypoints2.toList();
//putting the points of the good matches into above structures
for(int i = 0; i<goodMatches.size(); i++){
objList.addLast(keypoints_objectList.get(goodMatches.get(i).queryIdx).pt);
sceneList.addLast(keypoints_sceneList.get(goodMatches.get(i).trainIdx).pt);
}
//converting the points into the appropriate data structure
MatOfPoint2f obj = new MatOfPoint2f();
obj.fromList(objList);
MatOfPoint2f scene = new MatOfPoint2f();
scene.fromList(sceneList);
//findign the homography matrix
Mat H = Calib3d.findHomography(obj, scene,8,2);
//structure to hold the result of the homography matrix
Mat result = new Mat();
//size of the new image - i.e. image 1 + image 2
Size s = new Size(image1.cols()+image2.cols(),image1.rows());
//using the homography matrix to warp the two images
Imgproc.warpPerspective(image1, result, H, s);
//PROBLEM Maybe I need cv::Mat half() before writing the image? but I cannot find the corresponding function in OpenCV Java API
//creating the output file
boolean imageStitched = Highgui.imwrite("imageSitched.jpg",result);
}
public static void main(String args[]){
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
initialise();
}
}
Thanks for any help.
