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POCalling OpenCV from a web service
 

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  1. POCalling OpenCV from a web service
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    <p>I'm trying to call OpenCV face detection methods from inside a web service, but I'm getting various errors. Not sure if it is possible to do that or if anyone have tried it before. Here's what I did:</p> <p>1- Compile a modified sample OpenCV code at <a href="http://docs.opencv.org/doc/tutorials/objdetect/cascade_classifier/cascade_classifier.html" rel="nofollow">http://docs.opencv.org/doc/tutorials/objdetect/cascade_classifier/cascade_classifier.html</a> into a C++ DLL. the modified code is included below</p> <pre><code>String face_cascade_name = "haarcascade_frontalface_alt2.xml"; CascadeClassifier face_cascade; __declspec(dllexport) int __stdcall DetectFaceFromLumaBuffer (char *GrayBuf, int Rows, int Cols) { if (face_cascade.empty()) { if (!face_cascade.load(face_cascade_name)) { return (-1); } } Mat LumaFrame (Rows, Cols, CV_8UC1, GrayBuf, Mat::AUTO_STEP); int Idx = 0; equalizeHist(LumaFrame, LumaFrame); /* Equalize the image histogram */ std::vector&lt;Rect&gt; DetFaces; /* Array of detected rectangles */ face_cascade.detectMultiScale (LumaFrame, DetFaces, 1.1, 3, 0|CV_HAAR_SCALE_IMAGE|CV_HAAR_FIND_BIGGEST_OBJECT, Size(10, 10), Size(LumaFrame.cols, LumaFrame.rows) ); return (DetFaces.size()); } </code></pre> <p>2- Call the DLL's DetectFaceFromLumaBuffer() from .NET C# application using platform invoke.This works fine.</p> <p>3- Call the same function from web service also using platform invoke. The local IIS crashes: IIS Express Worker Process has stopped working.</p> <p>4- Comment out the line "equalizeHist(LumaFrame, LumaFrame);", the call generates an exception "SEHException was unhandled by user code"</p> <p>Any ideas? I'm using VS 2012 express and OpenCV 247</p> <p>Thanks</p>
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    1. USuser2852294
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    1. COIs your OpenCV compiled as 64bits?
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      1. USHylaean
    2. CONope, as i mentioned, the same DLL work perfectly in a desktop app...
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      1. POCalling OpenCV from a web service
      1. USuser2852294
    3. COThat doesn't mean much, it can run as a desktop app by defaulting to the right bitness and you can have IIS configured differently. Is there a way you can inspect this exception for content?
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      1. POCalling OpenCV from a web service
      1. USHylaean
 

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