lamthao's profile - activity

Hi,

is there any documentation about a list of the algorithms within opencv and opencv_contrib (found here https://github.com/Itseez)? I tried to use SURF with native openCV from android sdk with jni files. SURF cannot be used here. I know that since openCV3 the nonfree stuff is no longer part of the sdk and can be found in opencv_contrib(along with other extra modules). It would be nice if I knew which algorithms I can or cannot use with the native openCV from the android sdk?!

Thanks for any help. I appreciate it!

does that make any sense? right now, I tried to detect feature points with AKAZE and match them with FLANN (FlannBaseMatcher). This did not work with the error "Unsupported format or combination of formats". Which algorithms can I combine for FLANN and BruteForce?

I just started with openCV a few days ago and I am not used to the vocabulary so far. But I can explain my task and maybe somebody can tell me what can be done and what cannot be done. So, I have to develope an android app which reads a picture from the galery, takes the picture, do some operations with openCV and show the result. To do that, it should use native OpenCV 3 files. As I mentioned I used the native files from openCV 3 sdk from android.

What works already is painting the picture grey an show that (a very simple operation).

What should work (this is taken from my paper, I do not know if this makes sense) : - Detectors & Descriptors: BRIEF, Dense; FAST, GoodFeaturesToTrack, MSER, ORB, SIFT, STAR, SURF, FREAK and BRISK - Feature Point Algorithms: FLANN, BruteForce

Any ideas?

thanks for the quick answer and the useful information! i will try kaze then, am I correct to try this http://docs.opencv.org/3.0-beta/doc/t...

hi,

currently I am using the openCV 3 sdk for android. I am using the native files and with jni files. it is working so far.

now the problem: I want to implement FLANN (http://docs.opencv.org/3.0-beta/doc/t...). But I get an error. It says that it cannot find "opencv2/xfeatures2d.hpp". I found out that xfeatures2d is not included in the sdk (some other extra modules are also not included in the sdk). Those extra modules I found here https://github.com/Itseez/opencv_contrib and downloaded it. Now I can see the module xfeatures2d with all its source files (.cpp) and header files (.hpp). I know that the opencv_contrib is coming from the nonfree part of openCV and has legal issues and can not work with the openCV manager for android. But this is not important right now.

So, can I somehow include xfeatures2d in my project that the FLANN example will work?

If yes, how? Unfortunately I am not familiar with cmake and the cmake process. (Right now I just include the "OpenCV.mk" file from the sdk/native/jni folder within my Android.mk file and it works. Can I modify the OpenCV.mk file to tell him to include the .cpp and .hpp files needed by xfeatures2d?)

Any help would be great! Thank you!