2018-12-11 10:57:43 -0600 | received badge | ● Popular Question (source) |
2015-02-24 21:30:53 -0600 | asked a question | FeatureDetector for SURF Hello. I was wondering if it is possible to specify the Hessian threshold for the surf detector in the FeatureDetector class Or Will I need to continue using the cv::SurfFeatureDetector class and initialize it with the proper value? while this specifically asks about the SURF detector, I'd like to know if it is possible to pass parameters to the underlying detector class. AKA specify the hessian value for surf, set non-maximal suppression for fast detector, and so on. |
2014-07-14 06:58:10 -0600 | commented question | OpenCV 2.4.8 Ubuntu 14.04 imshow QMetaMethod::invoke Freeze Hi Steven, I forgot to mention but I also used a source installed version of Opencv 2.4.8. I think I've found the why of the program crash but not the how to fix (other than rewriting the program to have a specific thread for imshow). I was reading another persons problem that was similar and it seems imshow is not threadsafe as in problems occur when you try to update the same window from different threads. |
2014-07-13 16:45:48 -0600 | asked a question | OpenCV 2.4.8 Ubuntu 14.04 imshow QMetaMethod::invoke Freeze I've installed OpenCV 2.4.8 (libopencv-dev) by using apt-get and receive the following message. init done opengl support available QMetaMethod::invoke: Unable to invoke methods with return values in queued connections. I ran the program in gdb and it actually seems to stop and freeze on calling cv::waitKey(30); however, the problem only occurs when I call cv::imshow and it seems to be only when imshow is called in a callback function (in a single threaded program that had imshow in a loop did not exhibit the same problems). Here is the backtrace: Here is the output. I added a few cout statements to help decide exactly where the program was freezing. Here is a simplified version of the code that produces the problem: robot.h main.cc: I have written another very similar program that does not exhibit the freezing behaviors ... (more) |