OpenCV HOGDescriptor错误

Question

我在Mac OS X 10.8上运行OpenCV 2.4.3.我正在尝试使用cv :: HOGDescriptor来获取视频序列中的行人.

这是我用来执行检测并绘制边界框的代码.

  cv::VideoCapture input("file.avi");
  assert(input.isOpened());
  cv::HOGDescriptor body;
  assert(body.load("hogcascade_pedestrians.xml"));
  cv::Mat frame, gray;
  cv::namedWindow("video");

  while (input.read(frame)) {
    vector<cv::Rect> rects;
    cv::cvtColor(frame, gray, cv::COLOR_RGB2GRAY);
    cv::equalizeHist(gray, gray);

    body.detectMultiScale(gray, rects);
    for (unsigned int i=0;i<rects.size();i++) {
      cv::rectangle(frame, cv::Point(rects[i].x, rects[i].y),
          cv::Point(rects[i].x+rects[i].width, rects[i].y+rects[i].height),
          cv::Scalar(255, 0, 255));
    }
    cv::imshow("video", frame);
  }

但是,当执行到达该行时body.detectMultiScale(gray, rects);,我得到一个错误,整个应用程序崩溃

libc++abi.dylib: terminate called throwing an exception
[1]    92156 abort      ../bin/DetectPedestrians

出了什么问题？我似乎无法得到来自任何新的信息gdb或lldb输出.我正在使用CMake构建编译代码,所以我猜这不是链接的问题.

这是崩溃线程的堆栈跟踪 -

Thread 0 Crashed:: Dispatch queue: com.apple.root.default-priority
0   libsystem_kernel.dylib          0x00007fff8c001212 __pthread_kill + 10
1   libsystem_c.dylib               0x00007fff8e7afaf4 pthread_kill + 90
2   libsystem_c.dylib               0x00007fff8e7f3dce abort + 143
3   libc++abi.dylib                 0x00007fff94096a17 abort_message + 257
4   libc++abi.dylib                 0x00007fff940943c6 default_terminate() + 28
5   libobjc.A.dylib                 0x00007fff8e11f887 _objc_terminate() + 111
6   libc++.1.dylib                  0x00007fff96b0b8fe std::terminate() + 20
7   libobjc.A.dylib                 0x00007fff8e11f5de objc_terminate + 9
8   libdispatch.dylib               0x00007fff8c4ecfa0 _dispatch_client_callout2 + 28
9   libdispatch.dylib               0x00007fff8c4ed686 _dispatch_apply_serial + 28
10  libdispatch.dylib               0x00007fff8c4e80b6 _dispatch_client_callout + 8
11  libdispatch.dylib               0x00007fff8c4ebae8 _dispatch_sync_f_invoke + 39
12  libopencv_core.2.4.3.dylib      0x0000000101d5d900 cv::parallel_for_(cv::Range const&, cv::ParallelLoopBody const&, double) + 116
13  libopencv_objdetect.2.4.3.dylib 0x000000010257fa21 cv::HOGDescriptor::detectMultiScale(cv::Mat const&, std::vector<cv::Rect_<int>, std::allocator<cv::Rect_<int> > >&, std::vector<double, std::allocator<double> >&, double, cv::Size_<int>, cv::Size_<int>, double, double, bool) const + 559
14  libopencv_objdetect.2.4.3.dylib 0x000000010257fdc2 cv::HOGDescriptor::detectMultiScale(cv::Mat const&, std::vector<cv::Rect_<int>, std::allocator<cv::Rect_<int> > >&, double, cv::Size_<int>, cv::Size_<int>, double, double, bool) const + 80
15  DetectPedestrians               0x0000000101a7886c main + 2572 (detect.cpp:41)
16  libdyld.dylib                   0x00007fff8d89f7e1 start + 1

在Linux系统上,相同的代码给出了一个错误说 -

OpenCV Error: Assertion failed (dsize.area() || (inv_scale_x > 0 && inv_scale_y > 0)) in resize, file /home/subho/OpenCV/OpenCV-2.4.3/modules/imgproc/src/imgwarp.cpp, line 1726
terminate called after throwing an instance of 'tbb::captured_exception'
  what():  /home/subho/OpenCV/OpenCV-2.4.3/modules/imgproc/src/imgwarp.cpp:1726: error: (-215) dsize.area() || (inv_scale_x > 0 && inv_scale_y > 0) in function resize

Answer 1

我还没能找到为什么会发生这个错误.但是它与XML HOG级联文件如何加载到内存中有关.

我已经将此报告为OpenCV问题跟踪器中的错误,我正在等待开发人员的回复.

暂时,我解决这个问题的方法是直接在cv::HOGDescriptor类中设置SVM参数

cv::HOGDescriptor human;
human.setSVMDetector(cv::HOGDescriptor::getDefaultPeopleDetector());

这似乎适用于Mac OSX和Linux版本的OpenCV 2.4.3