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2014-08-18 04:44:16 -0600 | answered a question | SIGSEGV while finalizing MatOfRect (while GC) Solved. The problem was in a different matrix, that i've passed from c++ code. When returning a matrix address from jni, i had to use: because the java constructor Mat(long addr) doesn't add a reference to the counter of the matrix, but the finalizer does remove one reference. |
2014-08-04 12:18:37 -0600 | commented question | SIGSEGV while finalizing MatOfRect (while GC) I want to avoid garbage collection while the app is running. to do so i avoid object allocation as much as possible. BUT, I've already tried putting mFaceList as a local var and the same problem occurred as well. |
2014-08-03 12:17:56 -0600 | asked a question | SIGSEGV while finalizing MatOfRect (while GC) Hey guys, I'm using OpenCV4Android v.2.4.9 on Nexus 5 with android 4.4.4 stock rom. I use this piece of code for running haar cascade face detection: mFaceList is a MatOfRect i'm creating once when the class is initialized. When the class dies, I don't do anything with mFaceList (although i've also tried releasing it and that didn't help), and leave it to the garbage collector, but when the GC comes along later on, i get a SIGSEGV. After deep investigation i found the the problem is when release is called in the MatOfRect (Mat) finalizer. When my class dies the mFaceList has the following header: and in the finalize method of mFaceList it has the following header: That's when the SIGSEGV is occurring. any idea what can mess with the header like that? or why is this happening? I don't have any other references of this MatOfRect anywhere in the code. Any help would be appreciated. Vlad |
2014-08-03 11:15:51 -0600 | commented question | Unable to use KalmanFilter in Java on Android I ended up writing a little wrapper for native Kalman filter.. so i'll have to whole functionality. it took about 10 minutes so i guess for now, that's the way to go. |
2014-02-26 07:04:49 -0600 | answered a question | How can I measure performance of OpenCV4Android samples on several devices? you can use the DDMS tool that comes with the sdk http://developer.android.com/tools/debugging/debugging-tracing.html |
2014-02-17 18:39:42 -0600 | commented question | Unable to use KalmanFilter in Java on Android Did you find a solution for this? the wrapper makes no sense. I've tried running it without the transition matrix, and the filter does nothing to my values.. |
2012-07-18 11:47:00 -0600 | asked a question | NoClassDefFoundError trying to run my own code Hey guys, i've migrated my project to a new computer, and it stopped working. I get NoClassDefFoundError: org.opencv.objdetect.CascadeClassifier when trying to run it. I'm using eclipse indigo, on win7, trying to run on andorid 2.3.3. everything worked well before! i have the opencv2.4.2.jar referenced in my project, (no _src dirs) and i can see the CascadeClassifier.class there.. i don't know what's wrong.. any ideas? |