stitch image error:libc++abi.dylib: terminating with uncaught exception of type cvflann::anyimpl::bad_any_cast

[sushangjin]

System information (version)

• OpenCV => 3.2.0
• Operating System / Platform => iOS 10.2
• Compiler =>

Detailed description

stitching images on iphone will crash,output error:
libc++abi.dylib: terminating with uncaught exception of type cvflann::anyimpl::bad_any_cast

but stitching images success on the simulator.

Steps to reproduce

the iOS project file:
opencvtest.zip

[visez]

This user had the same problem 6 years ago, is it still applicable?
http://opencv-users.1802565.n2.nabble.com/cdiggins-anyimpl-bad-any-cast-while-using-flann-td7020469.html

[dbulaienko]

+1

[p-i-]

https://stackoverflow.com/questions/41762869/stitching-panorama-on-ios-crashes-with-cvflannanyimplbad-any-cast <-- a couple of hack-arounds here.

http://answers.opencv.org/question/503/how-to-use-the-lshindexparams/ <-- or here

EDIT: None of these succeeded!

[alalek]

Could someone try this patch ? It resolves memory corruption problem in flann library for some Apple compilers.

[p-i-]

I'm also getting hit by this bug: runtime error upon executing Stitcher::Status s = stitcher.estimateTransform(images);.

The error only occurs in debug build. Release build works okay.

Was it just that modules/flann/include/opencv2/flann/any.h operator to add? I inserted the code & rebuilt but it didn't change anything.

I noticed that patch is part of a larger commit (18 files modified). Should I be downloading and applying the whole commit? (can't see how to do this).

[alalek]

@p-i- Thank you for check! Other changes are not related to flann library.

[p-i-]

How does one go about debugging an iOS build? I can imagine setting up the project in Xcode copying across all the linker flags etc from opencv/platforms/ios/build_framework.py but that looks like a backbreaker.

[p-i-]

For my particular situation, replacing:
#import <opencv2/opencv.hpp>

... with:
#import <opencv2/stitching.hpp>
#import <opencv2/imgcodecs/ios.h> // UIImageToMat

... did the trick.

Hope this helps narrow it down for someone.

[devajith]

in my case replacing #include <opencv2/opencv.hpp>
with #include <opencv2/imgcodecs.hpp> worked.

[alex0-0]

Tried all of methods mentioned above, no one works... Struggling with this exception for so long time, can anybody help me?

[eduardramon]

Hi @alex0-0. I'm facing a very similar issue. Could you finally fix it?

[biomiker]

Here's a total hack that has gotten me past the cvflann::anyimpl::bad_any_cast exception. I suspect it will prove to be problematic down the road, but I'd be curious if anyone can comment on how feasible it is.

In Pods->OpenCV2->opencv_modules.hpp, on line 17, change:

#define HAVE_OPENCV_FLANN
to
#undef HAVE_OPENCV_FLANN

[tosone]

Any idea now? I met this problem on ios 12.0 with opencv 3.4.4.

[SergioGeeK7]

same

[SergioGeeK7]

My issue was solved starting the Flann as
flann::Index lsh_index(Mat(), flann::LshIndexParams(20,15,2));

[dannydaddy3]

I had similar problem: Fixed it by replacing general import to specific ones.
But it didn't work for the first time, and then I realised I had 'PrefixHeader.pch' file which had include <opencv2/opencv.hpp>.
I commented the line and it resolved problem with crash

[sunshinfight]

Including headers necessary but import <opencv2/opencv.hpp> work for me.
thanks.

[alalek]

bad_any_cast problem should be fixed here: #17640 (3.4.11 / 4.4.0)