AccessViolationException in DetectAndCompute()

[Shkarlatov]

Using version 3.2.0.20170324 via NuGet

In function DetectAndCompute() I get an exception

   in OpenCvSharp.Feature2D.DetectAndCompute(InputArray image, InputArray mask, KeyPoint[]& keypoints, OutputArray descriptors, Boolean useProvidedKeypoints) in C:\projects\opencvsharp\src\OpenCvSharp\Modules\features2d\Feature2D.cs:string 315
   in cv_test.Program.Main(String[] args) in C:\Users\User\Desktop\cv_test\cv_test\Program.cs:string 30
   in System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   in System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   in Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   in System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   in System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   in System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   in System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   in System.Threading.ThreadHelper.ThreadStart()

Small test code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OpenCvSharp;
using OpenCvSharp.Flann;
using OpenCvSharp.XFeatures2D;

namespace cv_test
{
    class Program
    {
        static void Main(string[] args)
        {   
        KeyPoint[] keyPoints;
            Mat descriptor = new Mat();
            SURF detector = SURF.Create(500);
            //FastFeatureDetector detector = FastFeatureDetector.Create(); 
            detector.DetectAndCompute(image_1,null,out keyPoints,descriptor);
        }
    }
}

But if you use the ORB orb=ORB.Create() orb.DetectAndCompute(image_1,null,out keyPoints,descriptor); then there is no exception

[shimat]

It works for me when the image_1 is successfully initialized.

using (var gray = Cv2.ImRead("lenna.png", ImreadModes.GrayScale))
using (var surf = SURF.Create(500))
using (Mat descriptor = new Mat())
{
    KeyPoint[] keyPoints;
    surf.DetectAndCompute(gray, null, out keyPoints, descriptor);

    Console.WriteLine($"keyPoints has {keyPoints.Length} items.");
    Console.WriteLine($"descriptor has {descriptor.Rows} items.");
}

[Shkarlatov]

It's not work. The same exception

static void Main(string[] args)
{
    using (var gray = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\test_.jpg", ImreadModes.GrayScale))
    using (var surf = SURF.Create(500))
    using (Mat descriptor = new Mat())
    {
        KeyPoint[] keyPoints;
        surf.DetectAndCompute(gray, null, out keyPoints, descriptor);

        Console.WriteLine($"keyPoints has {keyPoints.Length} items.");
        Console.WriteLine($"descriptor has {descriptor.Rows} items.");
    }
}

I attach test image.

[shimat]

Can you show me an InnerException of the thrown exception?

[Shkarlatov]

InnerException in null

[Shkarlatov]

Orb and SIFT work Surf and FastFeatureDetector do not work

[shimat]

please try the latest nuget https://www.nuget.org/packages/OpenCvSharp3-AnyCPU/3.2.0.20170419

[Shkarlatov]

            using (var gray = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\1.jpg", ImreadModes.GrayScale))
            using (var surf = SURF.Create(500))
            using (Mat descriptor = new Mat())
            {
                KeyPoint[] keyPoints;
                surf.DetectAndCompute(gray, null, out keyPoints, descriptor);

                Console.WriteLine($"keyPoints has {keyPoints.Length} items.");
                Console.WriteLine($"descriptor has {descriptor.Rows} items.");
            }

OpenCvSharp.OpenCVException не обработано
  ErrMsg=u != 0
  FileName=C:\libs\opencv\3.2\sources\modules\core\src\matrix.cpp
  FuncName=cv::Mat::create
  HResult=-2146233088
  Line=433
  Message=u != 0
  Source=OpenCvSharp
  StackTrace:
       в OpenCvSharp.NativeMethods.<>c.<.cctor>b__7_0(ErrorCode status, String funcName, String errMsg, String fileName, Int32 line, IntPtr userdata) в C:\projects\opencvsharp\src\OpenCvSharp\PInvoke\NativeMethods.cs:строка 206
       в OpenCvSharp.NativeMethods.features2d_Feature2D_detectAndCompute(IntPtr detector, IntPtr image, IntPtr mask, IntPtr keypoints, IntPtr descriptors, Int32 useProvidedKeypoints)
       в OpenCvSharp.Feature2D.DetectAndCompute(InputArray image, InputArray mask, KeyPoint[]& keypoints, OutputArray descriptors, Boolean useProvidedKeypoints) в C:\projects\opencvsharp\src\OpenCvSharp\Modules\features2d\Feature2D.cs:строка 270
       в cv_test.Program.Main(String[] args) в C:\Users\User\Desktop\cv_test\cv_test\Program.cs:строка 30
       в System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       в System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       в Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       в System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       в System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       в System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

[shimat]

It works for me.

It seems to fail memory allocation of Mat. Please check your available memory. Can you run a simpler OpenCvSharp program that does not use SURF?

See https://github.com/opencv/opencv/issues/6595.

[Shkarlatov]

        static void Main(string[] args)
        {
            Mat m1 = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\1.jpg", ImreadModes.GrayScale);
            //Mat m2 = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\2.jpg", ImreadModes.GrayScale);
            using (var img = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\1.jpg", ImreadModes.GrayScale))
            using (var detector = FastFeatureDetector.Create(500))
            using (Mat descriptor = new Mat())
            {
                KeyPoint[] keyPoints;
                detector.DetectAndCompute(img, null, out keyPoints, descriptor);

                Console.WriteLine($"keyPoints has {keyPoints.Length} items.");
                Console.WriteLine($"descriptor has {descriptor.Rows} items.");
            }
            Console.Read();
        }

        System.AccessViolationException не обработано
  HResult=-2147467261
  Message=Попытка чтения или записи в защищенную память. Это часто свидетельствует о том, что другая память повреждена.
  Source=OpenCvSharp
  StackTrace:
       в OpenCvSharp.NativeMethods.features2d_Feature2D_detectAndCompute(IntPtr detector, IntPtr image, IntPtr mask, IntPtr keypoints, IntPtr descriptors, Int32 useProvidedKeypoints)
       в OpenCvSharp.Feature2D.DetectAndCompute(InputArray image, InputArray mask, KeyPoint[]& keypoints, OutputArray descriptors, Boolean useProvidedKeypoints) в C:\projects\opencvsharp\src\OpenCvSharp\Modules\features2d\Feature2D.cs:строка 270
       в cv_test.Program.Main(String[] args) в C:\Users\User\Desktop\cv_test\cv_test\Program.cs:строка 23
       в System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       в System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       в Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       в System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       в System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       в System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

---

Its work
        static void Main(string[] args)
        {
            Mat m1 = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\1.jpg", ImreadModes.GrayScale);
            //Mat m2 = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\2.jpg", ImreadModes.GrayScale);
            using (var img = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\1.jpg", ImreadModes.GrayScale))
            using (var detector = ORB.Create(500))
            using (Mat descriptor = new Mat())
            {
                KeyPoint[] keyPoints;
                detector.DetectAndCompute(img, null, out keyPoints, descriptor);

                Console.WriteLine($"keyPoints has {keyPoints.Length} items.");
                Console.WriteLine($"descriptor has {descriptor.Rows} items.");
            }
            Console.Read();
        }

---

static void Main(string[] args)
        {
            Mat m1 = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\1.jpg", ImreadModes.GrayScale);
            //Mat m2 = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\2.jpg", ImreadModes.GrayScale);
            using (var img = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\1.jpg", ImreadModes.GrayScale))
            using (var detector = SIFT.Create(500))
            using (Mat descriptor = new Mat())
            {
                KeyPoint[] keyPoints;
                detector.DetectAndCompute(img, null, out keyPoints, descriptor);

                Console.WriteLine($"keyPoints has {keyPoints.Length} items.");
                Console.WriteLine($"descriptor has {descriptor.Rows} items.");
            }
            Console.Read();
        }

OpenCvSharp.OpenCVException не обработано
  ErrMsg=u != 0
  FileName=C:\libs\opencv\3.2\sources\modules\core\src\matrix.cpp
  FuncName=cv::Mat::create
  HResult=-2146233088
  Line=433
  Message=u != 0
  Source=OpenCvSharp
  StackTrace:
       в OpenCvSharp.NativeMethods.<>c.<.cctor>b__7_0(ErrorCode status, String funcName, String errMsg, String fileName, Int32 line, IntPtr userdata) в C:\projects\opencvsharp\src\OpenCvSharp\PInvoke\NativeMethods.cs:строка 206
       в OpenCvSharp.NativeMethods.features2d_Feature2D_detectAndCompute(IntPtr detector, IntPtr image, IntPtr mask, IntPtr keypoints, IntPtr descriptors, Int32 useProvidedKeypoints)
       в OpenCvSharp.Feature2D.DetectAndCompute(InputArray image, InputArray mask, KeyPoint[]& keypoints, OutputArray descriptors, Boolean useProvidedKeypoints) в C:\projects\opencvsharp\src\OpenCvSharp\Modules\features2d\Feature2D.cs:строка 270
       в cv_test.Program.Main(String[] args) в C:\Users\User\Desktop\cv_test\cv_test\Program.cs:строка 23
       в System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       в System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       в Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       в System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       в System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       в System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

---

1.jpg it is grayscale JPG 6779 x 8530

If i change target build to x64, when

        static void Main(string[] args)
        {
            Thread.Sleep(2000);
            //Mat m1 = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\1.jpg", ImreadModes.GrayScale);
            //Mat m2 = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\2.jpg", ImreadModes.GrayScale);

            using (var img = Cv2.ImRead(@"C:\Users\User\Desktop\test_photo\test_.jpg", ImreadModes.GrayScale))
            using (var detector = SIFT.Create(500))
            using (Mat descriptor = new Mat())
            {
                KeyPoint[] keyPoints;
                detector.DetectAndCompute(img, null, out keyPoints, descriptor);

                Console.WriteLine($"keyPoints has {keyPoints.Length} items.");
                Console.WriteLine($"descriptor has {descriptor.Rows} items.");
            }
            Console.Read();
        }

eat all my memory (4Gb) and I can only kill process. If set small image (as first test image 480 x 328) its work,but keyPoints.Length and descriptor.Rows = 502 (why if i set 500)

[takuya-takeuchi]

Hi CrazyAlex25

FastFeatureDetector.Create().DetectAndCompute should throw exception because this function is not implemented in native opencv 3.2.0.

I tried the following code in VC++ 14.

#include "stdafx.h"
#include <opencv2/opencv.hpp>
#include <opencv2/features2d/features2d.hpp>

int _tmain(int argc, _TCHAR* argv[])
{
    // This image is retrieved from https://dwimaging.files.wordpress.com/2013/03/big-ben-panorama-old-s.jpg
    cv::Mat m1 = cv::imread("F:\big-ben-panorama-old-s.jpg", CV_LOAD_IMAGE_GRAYSCALE);
    cv::Mat img = cv::imread("F:\big-ben-panorama-old-s.jpg", CV_LOAD_IMAGE_GRAYSCALE);
    auto detector = cv::FastFeatureDetector::create(500);
    cv::Mat descriptor;
    std::vector<cv::KeyPoint> keyPoints;
    detector->detectAndCompute(img, NULL, keyPoints, descriptor);

    printf("keyPois has %llu items\n", keyPoints.size());
    printf("descriptor  has %d items\n", descriptor.rows);

    return 0;
}

And throw

OpenCV Error: The function/feature is not implemented () in cv::Feature2D::detectAndCompute, file C:\build\master_winpack-build-win64-vc14\opencv\modules\features2d\src\feature2d.cpp, line 154

So I guess that what FastFeatureDetector.Create().DetectAndCompute failed is not OpenCVSharp issue.

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