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2014-09-02 15:49:59 -0600 | commented answer | Include multiple objects in one contour Can't you just use contour instead of Mat(contour) in convexHull ? i.e. convexHull(contour, hull, false) Can you also check that the error is not coming from the instruction "Mat(contour)" |
2014-09-02 15:34:44 -0600 | commented answer | Include multiple objects in one contour Can you provide more information ? When exactly are you issuing this error? When calling the push_back() function ? |
2014-09-02 15:25:09 -0600 | commented question | OpenCV troubles with convexHull But convex hull shouldn't need a valid contour, just a point set. |
2014-09-02 13:45:23 -0600 | commented answer | Include multiple objects in one contour Just insert every points of one contour into the other one. |
2014-09-02 02:30:15 -0600 | answered a question | Include multiple objects in one contour Did you try using convexHull()? It finds the convex hull of a point set, I guess if you can "union" the contours (which are vector of points) that are close enough, and then apply this function, it can do the job. |
2014-08-30 03:52:19 -0600 | answered a question | Is it possible to use OpenCV in Android- and IPhone-App without rooting/jailbreaking the device? You can use OpenCV in android without any rooting. I don't know about Iphone though, but I guess you don't need to jailbreak it neither.... |
2014-08-29 08:06:13 -0600 | commented question | Weird bug with VideoCapture Thanks for your answer, for the first point, I only have 2 ids for this simple example, but I may have a lot more cameras in my real program. The second point solved my problem, I don't know why, but I was creating a new object each time I was changing the source device, but using the function "open()" solved my problem (as it calls release) Thank you! |
2014-08-29 07:15:49 -0600 | asked a question | Weird bug with VideoCapture Hello everybody, I'm facing a very weird bug when using VideoCapture. I have two webcams, and I want to switch between them. When the program is started, it opens device 0. When the user presses 'd', he gets connected to 'current_device+1'. When he presses 'q', he gets connected to 'current_device-1' I can switch between 0 and 1 very well, and multiple times without any problem, however, when I try to connect to device 2, it detects a problem (I only have 2 cams), and then connects back to 1. No problem until here, however, when I press 'q', it tries to connect to device 0, and here is the problem, it can connect, but the operator "<<" is very slow (1 second I think), and it always returns empty Mat.... Here is the code (very simple reproduction of the problem (most of the lines are just to print stuff on the console)): And here is an output with this code: At the beginning, I just switch between 0 and 1: Trying to open 1... done. Trying to open 0... done Trying to open 1... done. Trying to open 0... done Trying to open 1... done. I then press 'd' when I'm connected to device 1 (so it connects to device 2, and goes back to device 1): Trying to open 2...But is not working, trying to open 1...And is working And 'q' when I'm connected to device 1, the connection seems okay, but it's very slow and the frames are empty: Trying to open 0... done WTF, frame is empty. WTF, frame is empty. WTF, frame is empty. WTF, frame is empty. WTF, frame is empty. However I can still go back to device 1 without any problem! But device 0 seems to be broken after having connected to device 2.... Do you have any suggestion? I'm working on Windows 7 64 bits |
2014-08-23 06:20:36 -0600 | asked a question | Cannot compile OpenCV 3.0 Hello, I downloaded OpenCV 3.0 from this website, and after the cmake step, I obtain an an error during the make step, here it is: Linking CXX shared library ....\bin\libopencv_core300.dll c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: cannot find -lRunTmChk collect2.exe: error: ld returned 1 exit status modules\core\CMakeFiles\opencv_core.dir\build.make:1257: recipe for target 'bin/libopencv_core300.dll' failed mingw32-make[2]: * [bin/libopencv_core300.dll] Error 1 CMakeFiles\Makefile2:1325: recipe for target 'modules/core/CMakeFiles/opencv_core.dir/all' failed mingw32-make[1]: [modules/core/CMakeFiles/opencv_core.dir/all] Error 2 Makefile:136: recipe for target 'all' failed mingw32-make: ** [all] Error 2 I'm under Windows7 64bits, and using mingw32 4.8.1 I have no idea of what is -lRunTmChk, so any help would be greatful... Also, I have to add that I can compile OpenCV 2.4.9 without any problem. Any suggestion? |
2014-08-01 09:20:32 -0600 | asked a question | HIGHGUI ERROR when opening webcam Hello, I have a problem opening my webcam with openCV This line of code cv::VideoCapture _capture = cv::VideoCapture(0); Create an error in the console: HIGHGUI ERROR: V4L/V4L2: VIDIOC_S_CROP Do you have any suggestion? I'm using Xubuntu 32b, I also compiled opencv myself. Thank you! |
2014-07-22 03:08:31 -0600 | commented question | opencv and qt Ok thank you, but even though there is a particular path to FFMPEG in the pro file, I don't have to download and compile it? Thanks for your help, I will try that |
2014-07-22 02:42:05 -0600 | asked a question | opencv and qt Hello, I'm having trouble compiling opencv with mingw32. I have a project which needs opencv, qt, and ffmpeg. In the .pro file, I have these lines: I will work on qtcreator, and to compile opencv, I use CMAKE and mingw32. My question is, do I need to tick WITH_QT and WITH_FFMPEG? QT is already installed, and will be found by qtcreator, so I don't need it with opencv, am I right? And same question for FFMPEG, as there is a different path for FFMPEG, I will download FFMPEG, and compile it myself, so I think I don't need to tick WITH_FFMPEG.... I'm new to this kind of stuff, and I have to admit that I'm a bit lost.... Thanks for your help, Florian |
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2012-11-14 03:26:41 -0600 | commented answer | How to get the best detection for an object Thanks, it could work of course, but performance will be a pain... I've simplified my problem, but i'm building a real-time application on Android, so it's not really possible to do that... I'm going to look around the grouping function, because I can get every rectangle by setting minNeighbors to 0, and maybe I can make my own grouping function, remembering how many rectangles were merged to build a rectangle... |
2012-11-14 02:17:50 -0600 | commented question | Error: Cannot run program "\ndk-build.cmd" Have you tried to remove the ".cmd" at the end of the command inside eclipse ? |
2012-11-13 14:02:45 -0600 | asked a question | How to get the best detection for an object Hello, But with this, I'm not getting the "best" face, but the bigger one, and I think it could result in an oversized rectangle around the face. Thanks for your help, |
2012-10-05 07:10:29 -0600 | marked best answer | findContours gives me the border of the image Hello, I'm working with OpenCv on Android and have a problem with the findContours function because it gives me the border of the image. Here is an example (source image will always be a thresholded image) :
As you can see, I do have the contour of the blob, but I don't want to get the contour of the picture... Actually, I need to find the biggest blob, so what I do is to find every contour, and then find the one with the biggest area, but to do this, I have to save the biggest area (which will be the contour of the image) and the second biggest (which will be the true biggest blob)... I think it's pretty ugly and a waste... Is it a normal behaviour ? And Is there a way of getting rid of this ? EDIT : here is the code i'm using |
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