Program crashes during findContours() execution

findContours

asked 2012-11-18 05:11:49 -0600

Crash
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updated 2012-11-18 07:14:45 -0600

Hello guys

I got a problem with finding contours in the image. I'm trying to run a simple example on VS 2012 from the official site(http://docs.opencv.org/doc/tutorials/imgproc/shapedescriptors/find_contours/find_contours.html)

But the program always crashes with the following error:

OpenCV Error: Assertion failed (0 <= contourIdx && contourIdx < (int)last) in un known function, file ......\src\opencv\modules\imgproc\src\contours.cpp, line 1810

I've tried different modes CV_RETR_TREE,CV_RETR_LIST,CV_RETR_CCOMP but in vain.

I've also tried the sample from opencv/samples/cpp/connected_components.cpp, but always got another kind of mistake:

OpenCV Error: Unsupported format or combination of formats ([Start]FindContours support only 8uC1 and 32sC1 images) in unknown function, file ......\src\openc v\modules\imgproc\src\contours.cpp, line 196

I checked my code many times and red all manuals I'd found...all suggested samples are almost the same I begin to suppose the problem might consist into Visual Studio 2012 Also I noticed that all official samples run on Linux I use OpenCV version 2.4.3

Any ideas?

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answered 2012-11-18 12:57:19 -0600

Crash
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updated 2012-11-18 12:59:01 -0600

Problem has been solved I decided to come back to VS 2010 and all work fine now without any mistakes( damn Microsoft) VS 2012 is a piece of raw crap

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Thanks for providing this enlightening insight.

SR ( 2012-11-19 01:48:47 -0600 )edit

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answered 2012-11-18 07:00:46 -0600

Michael Burdinov
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Are you completely sure that your image is gray level image with one channel, and your contours is vector of vector of Point and not Point2d or anything like that?

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If you see the example there is a function cvtColor( src, src_gray, CV_BGR2GRAY ); It converts images to the gray color I've tried different images, but the result is always the same. The simpliest way I tried in brouser right click->save image->then attempt to open it via opencv...and program craches.

Crash ( 2012-11-18 07:09:38 -0600 )edit

Even if findContours is the function that crushed it doesn't mean that it is the one responsible for crash. Problem may start from any function before that. So I recommend you not to trust that everything was ok, but to put some 'if' statement before findContours just to be sure that input image is indeed CV_8UC1. From what I see in second error you posted this is not the case.