elliotwoods's profile - activity

binary calibration pattern with XY recoverable features Hi all I think I've seen this before, but it is also possible t

Thanks cudawarped. Just to check - did you compile for only 1 CUDA architecture, or all architectures? Compiling here (a

binary calibration pattern with XY recoverable features Hi all I think I've seen this before, but it is also possible t

binary calibration pattern with XY recoverable features Hi all I think I've seen this before, but it is also possible t

binary calibration pattern with XY recoverable features Hi all I think I've seen this before, but it is also possible t

I'm also noticing this (e.g. several hours to build with CUDA) I understand that it's building many versions of each ke

I'm also noticing this (e.g. several hours to build with CUDA) I understand that it's building many versions of each ke

[Paid job] Multi-view solvePnP routine Hi all! I need a multi-view version of the solvePnP function. Qualitively: We w

@Tetragramm seems to have solved this at: https://github.com/Tetragramm/opencv_contrib/blob/master/modules/mapping3d/inc

[Paid job] Multi-view solvePnP routine Hi all! I need a multi-view version of the solvePnP function. Qualitively: We w

[Paid job] Multi-view solvePnP routine Hi all! I need a multi-view version of the solvePnP function. Qualitively: We w

@Tetragramm seems to have solved this at: https://github.com/Tetragramm/opencv_contrib/blob/master/modules/mapping3d/inc

Hi Tetragramm. In the end we went with single-camera because we couldn't get stereo working in time (i didn't get a chance to try your implementation). I didn't receive an email from you, and I just want to get in touch again to say thank you for your time and let's chat on email if you have time.

Hi @Tetragramm. Wow this is amazing! I'll try this is as soon as I can . The artwork opening is tomorrow, and my attempt at stereo solvePnP using non-linear fit didn't work (warning - uses other libraries, also produces terrible results. i think i have something wrong somewhere). so i'm on a monocular route right now. will try and switch to your solution tonight. do you have a DM channel?

Thanks for letting me know about composeRT! it really helps

We can presume that the markers are in ordered sets. i.e. objectPoints1 and imagePoints1 are equal length, and objectPoints1[i] corresponds with imagePoints1[i] (as with solvePnP)

Hi @Tetragramm! I linked to this post from a few places so want to stick with it if possible (i think it gets bumped up the list when somebody posts here).

this isn't necessarily an exception about memory allocation (in fact, most likely it isn't).

try wrapping your code like this

try {
    codeWhichCausesPain();
} catch(const std::exception & e) {
   cout << "Doesn't work : " << e.what();
}

also check your console. generally when an exception is thrown in opencv it gets written to the console also.

Then once you know what the exception is, and what code is causing it, then we can figure out what the reason is :)

current thinking : adding another line after https://github.com/opencv/opencv/blob... to include the error from the second camera would result in a simultaneous solve. Just would need to be able to transform _r and _t by either R+T,E,F from stereoCalibrate.

having the same issue here! after setting up the whole studio with marker_mapper's favourite MIP_36h12. I'm unable to use any of the markers in OpenCV :)

User berak was correct. This was a 32bit/64bit mismatch issue.

The bad setting wasn't in the project settings but in the Solution configuration (was set to use the 32bit version of the project for the 64bit build profile). I've seen that pop up a couple of times before but didn't recognise the symptoms.

Thanks to all on IRC and here for helping

Elliot

hi berak. Thank you for helping on this! I now tried moving opencv_core320.lib to front and end of lib list but same result. definitely using all 64bit (checked dumpbin and all application project settings). I'll try CMAKE now as a sanity check + if it works i can compare project differences.

also i posted the question on SO http://stackoverflow.com/questions/42... (i imagine more general C++ experience with name mangling there, and more experience with opencv building here :)

Hey all

I've been hitting a problem for a couple of days now of getting OpenCV to run within a project with VS2015 but am having library linking problems.

Specifically, I'm the maintainer of the ofxCvMin addon for openFrameworks, and am currently trying to upgrade the libraries from 2.4.x to 3.2.0. (I've built and linked opencv libs a few times for windows and osx over the years).

I can successfully build Debug and Release libs (this wasn't an issue at all). (note : current setup is static libs, not using static CRT)

I managed to build an application linking the debug libraries (with a little extra help on #opencv IRC), but Release is still is not working. VC++ doesn't seem to recognise the imported symbols.

Diggiging deeper, it seems that the C++ application is looking for :

?deallocate@Mat@cv@@QAEXXZ
public: void __thiscall cv::Mat::deallocate(void)

when building. But in opencv_core320.lib we have:

?deallocate@Mat@cv@@QEAAXXZ
public: void __cdecl cv::Mat::deallocate(void) __ptr64

which VC++ doesn't consider to be a compatible symbol. I presume there are some project settings which affect the symbol naming strategy (__thiscall <> __cdecl hints at a C++ vs C style).

Is anybody aware of project settings which affect how the symbols are decorated when using OpenCV with VC++?

Thank you

NB : CMAKE is not an option here as the projects/solutions need to be openFrameworks generated (although could be used to look into which build settings are present)

I'm sorry but it doesn't get what I want :). I wish there was a way to hack stereoCalibrate to do what I need (e.g. if there were flags like USE_STEREO_EXTRINSICS_GUESS | FIX_STEREO_EXTRINSICS, and it output the extrinsics to the object rather than just between the cameras). Or perhaps it wasn't clear from my question that I want the extrinsics of the stereo pair RELATIVE TO THE SCENE, not to each other.. Thank you

please clarify which language you are using with Visual Studio, e.g. C++, VB, C#, etc.

Visual Basic As @berak notes, OpenCV does not support Visual Basic (although there are unofficial .NET wrapping for OpenCV which you could use to employ OCV in VB). Due to the nature of .NET, you wouldn't need libraries which were specifically built for Visual Basic .NET 2017, you could use older libraries also.

Visual C++ If you're referring to VC (Visual C++), then you will need c++ libraries (and binaries) built with/for Visual C++ 2017. These are not available officially yet, but you could try using a recent version of cmake and a recent version of opencv from github to generate and build your own VC 2017 projects and solution. But you likely will hit many issues.

Since it sounds like you might be new to OpenCV, it's strongly suggested that you use a well supported platform e.g. Visual C++ 2015. If you want to avoid C++, then please consider using OpenCV with Python as it is quite easy to setup and is well documented.