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2012-07-24 07:57:54 -0500 commented question opencv with gpu crash in debug mode

Even tried to compile opencv with CUDA_ARCH_BIN = 1.1 and PTX=1.1 but no vain, the problem still persists, the error now apears when initializing a gpumat e.g. prev_imgMatGPU=cv::gpu::GpuMat(image);

and error points to the line in the gpumat.cpp

void mallocPitch(void* devPtr, size_t step, size_t width, size_t height) const { cudaSafeCall( cudaMallocPitch(devPtr, step, width, height) ); }

I can see in the debugger that image is not empty, it has width and height, so i don't know what actually is troubling it.

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2012-07-24 05:23:04 -0500 commented question feature detector crash

Thanks, actually i didn't know when they moved it into separate lib. So when i figured it out the problem was solved.

2012-07-24 05:11:13 -0500 asked a question opencv with gpu crash in debug mode


I am using opencv2.4.2 with visual studio 2010 build with cmake (CUDA enabled). The problem is i consistently get a crash when accessing gpu methods/initializations while being in debug mode. It works in release mode although that too needs to be run outside visual studio otherwise some crash occur. The exception that i receive is as follows:

First-chance exception at 0x76dbfbae in opencvGPUtest.exe: Microsoft C++ exception: cudaError_enum at memory location 0x00a3e258

The error is very consistent, and i have seen couple of examples over the internet with others ( It is very difficult to work without debug support while working with large projects, so kindly help me fix this.


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2012-07-23 14:22:55 -0500 commented answer OpenCV with Qt support namedWindow crash

Actually the cuda arch variable as i understand is relative to the graphics card's compatibility so that is the reason i put it 1.1 (for NVIDIA quadro 140M). Anyway i have checked with 2.0 being set for both which comes as a default value too but the problem persists. The qt\bin path is in environemnt as i can access from the shell qmake.exe. Cuda version is 4.2 Although i have noticed that you have qt inside opencv as a dependency whereas i have downloded qt from the qt website and its version is 4.8.0 while yours seem to be 4.8.2

2012-07-23 06:52:27 -0500 answered a question OpenCV with Qt support namedWindow crash

Thanks for the reply. I am using VS2010 for compilation and has version 14.

Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86

I have seen such a problem elsewhere with others too so it might not be related to CUDA as i can run cuda opencv samples. It works in Release mode but fails in debug mode. In release mode i get another issue which is a crash at "GPUMat" definition. Although this also works fine outside visual studio in release mode and fails to work inside vs2010 or in debug.


2012-07-23 05:59:09 -0500 commented question feature tracking assertion fail error

I have checked from the documentation about the type of FASTGPU return type but it is not listed there. So then i have tried printing from the code and it returns '5' which means 'CV32F' . They are keypoints so shoudn't it be possible to pass them to pyrLK even though they have slightly different type?

2012-07-21 13:09:29 -0500 answered a question OpenCV with Qt support namedWindow crash

Sorry for late reply, i forgot to check the follow on for the message. I tried to upload the cmakecache.txt, if it is what you meant by config but i can not upload it due to forum restrictions. So i am posting it here.

# This is the CMakeCache file.
# For build in directory: c:/opencv/build
# It was generated by CMake: C:/Program Files/CMake 2.8/bin/cmake.exe
# You can edit this file to change values found and used by cmake.
# If you do not want to change any of the values, simply exit the editor.
# If you do want to change a value, simply edit, save, and exit the editor.
# The syntax for the file is as follows:
# KEY is the name of a variable in the cache.
# TYPE is a hint to GUI's for the type of VALUE, DO NOT EDIT TYPE!.
# VALUE is the current value for the KEY.

# EXTERNAL cache entries

//Path to a program.

//Create build rules for OpenCV Documentation

//Build all examples

//Build libjasper from source

//Build libjpeg from source

//Enables 'make package_source' command

//Build performance tests

//Build libpng from source

//Build shared libraries (.dll/.so) instead of static ones (.lib/.a)

//Build accuracy & regression tests

//Build libtiff from source

//Include debug info into debug libs (not MSCV only)

//Enables use of staticaly linked CRT for staticaly linked OpenCV

//Build zlib from source

//Include opencv_calib3d module into the OpenCV build

//Include opencv_contrib module into the OpenCV build

//Include opencv_core module into the OpenCV build

//Include opencv_features2d module into the OpenCV build

//Include opencv_flann module into the OpenCV build

//Include opencv_gpu module into the OpenCV build

//Include opencv_highgui module into the OpenCV build

//Include opencv_imgproc module into the OpenCV build

//Include opencv_legacy module into the OpenCV build

//Include opencv_ml module into the OpenCV build

//Include opencv_nonfree module into the OpenCV build

//Include opencv_objdetect module into the OpenCV build

//Include opencv_photo module into the OpenCV build

//Include opencv_stitching module into the OpenCV build

//Include opencv_ts module into the OpenCV build

//Include opencv_video module into the OpenCV build

//Include opencv_videostab module into the OpenCV build

//Semicolon separated list of supported configuration types, only
// supports Debug, Release, MinSizeRel, and RelWithDebInfo, anything
// else will be ignored.

//C++ compiler

//Flags used by the compiler during all build types.

//Flags used by the compiler during debug ...
2012-07-21 12:42:41 -0500 asked a question feature tracking assertion fail error


I am trying to track feature using optical flow method. The features are corners extracted from fast as a gpu::GpuMat keypoints. The problem is that the call to "sparse" function fail with following error:

OpenCV Error: Assertion failed (prevPts.rows == 1 && prevPts.type() == CV32FC2) in unknown function, file H:\opencv\modules\gpu\src\pyrlk.cpp, line 114 CV error occured : C:\opencv\modules\gpu\src\pyrlk.cpp:114: error: (-215) prevPt s.rows == 1 && prevPts.type() == CV32FC2

I've checked that the previous keypoints that i am passing to it are non zero. Although i have two rows in gpu::GpuMat. Is that correct? Actually i tried the fast_GPU documentation but i couldn't understand "Location Row"/"Response Row". Even if i use only single row from it for passing to sparse, i still get the assertion. It is unclear how could i make the features points from fast to be compatible with optical flow function? Kindly help in this regard.

Best Regards,

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2012-07-16 13:55:05 -0500 answered a question feature detector crash

I've figured it out. In new versions of opencv the SURF/SIFT are distributed in a separate library which needs to be initialized before creation of feature detector.

2012-07-16 12:01:59 -0500 answered a question feature detector crash

I've noticed one thing that changing the detector method to FAST makes the same code work. Does this mean that SURF is not being implemented in opencv anymore?

2012-07-16 11:01:42 -0500 received badge  Editor (source)
2012-07-16 10:56:56 -0500 asked a question feature detector crash


feature detector fails when used in simple program in visual studio 2010. I am using opencv 2.4.2 and also checked on 2.4.1. Only thing that is being done is to create a feature detector and use that to detect keypoints in an image. I get unhandled exception crash pointing to a function named "detecImpl()" inside detectors.cpp (i.e. features2d\detectors.cpp line:65). This error is really stuck and has taken enormous amount of time so any help is really appreciated.

#include <iostream>
#include <opencv2/core/core.hpp>
#include "opencv2/highgui/highgui.hpp"
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/features2d/features2d.hpp>

using namespace std;
using namespace cv;

int main(int argc, char* argv[])
cv::Ptr<cv::FeatureDetector> featureDetector;
    cv::Ptr<cv::DescriptorExtractor> descriptorExtractor;
    featureDetector = cv::FeatureDetector::create("SURF");
    descriptorExtractor = cv::DescriptorExtractor::create("SURF");
cv::Mat imageColor;
cv::Mat image = cv::imread("car1.jpg", 0);
    cv::cvtColor(image, imageColor, CV_GRAY2BGR);
        imshow("Test Image",imageColor);
    catch(cv::Exception exc)
        cout << "CV error occured : " + exc.msg;
std::vector<cv::KeyPoint> currentKeypoints;

            featureDetector->detect(image,currentKeypoints);   //This line generates the error but no exception is caught ....
    catch(cv::Exception exc)
        cout << "CV error occured : " + exc.msg;
        return -1;
2012-07-16 09:26:35 -0500 asked a question OpenCV with Qt support namedWindow crash


I've opencv 2.4.2 build with visual studio 2010 and CMAKE (qt support enabled). Whenever, i use a simple program opening a window/use imshow then i get unhandled exception crash and in the terminal window i get opencv error :

OpenCV error: Null pointer <null session="" handler=""> in unknown function, file, pathtoopencv\highgui\src\window_qt.cpp line 909

The same program with the same configuration settings work in 'Release' configuration. It only fails in Debug mode. I also tried to build the opencv with SSE/SSE2 disabled but still am getting the crash.