unable to load the haarcascadeshaarcascade.xml in opencv

Im trying face detection using opencv in android but I unable to load the object detection xml files.

The code is as follows,

.....

static CvHaarClassifierCascade* cascade = 0;
  CvMemStorage* storage = 0;
  LOGI("before haarcascade");  

if (!cascade) {
    const char* file = "/Users/Downloads/OpenCV-

2.2.0/data/haarcascadeshaarcascade_frontalface_alt.xml";
    cascade = (CvHaarClassifierCascade *)cvLoad(file, 0, 0, 0);
    storage = cvCreateMemStorage(0);
  }  

if(cascad开发者_开发知识库e)
      LOGI("xml loaded");
  else
          LOGI("unable to load the xml");

......

In logcat it showing that unable to load the xml.

How to load the xml??

Please someone help me out.

Thanks, Srinivasan

Daft question... but the file does exist doesn't it?

If that code runs on your android device, but the file exists on the host (Mac OS) workstation you're out of luck!

Should be the path issue. Please write the full path or keep the xml file along with the code so that it picks it up directly.

Try Putting this before loading the cascade:

    /////////////////////////////////////////////////////////////////////////
///OpenCV Bug Work-around////////////////////////////////////////////////
IplImage* dummyImage = cvCreateImage(cvSize(1, 1), IPL_DEPTH_8U, 1);/////
cvErode(dummyImage, dummyImage);/////////////////////////////////////////
cvReleaseImage(&dummyImage);/////////////////////////////////////////////
///OpenCV Bug Work-around////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////

don't you need a directory separating slash between haarcades and haarcascade_frontalface....

const char* file = "/Users/Downloads/OpenCV-

2.2.0/data/haarcascades/haarcascade_frontalface_alt.xml";

• For those who are struggling with loading haarcascade .xml file, it is because Android does not allow to access "etc" folder in OpenCV-Android (as I understand)

• At first, I put haarcascade file in app/res/raw manually

• For Camera X (Kotlin), paste these in onCreate() or in your ImageAnalyzer (file is created repeatedly every lifecycle)

       // Cannot load Haar Cascade file because path to OpenCV resources cannot be accessed directly(Android security)
       // So put model file manually in "/res/raw" resource folder
       val haarRelativePath = "/res/raw/haarcascade_frontalface_alt2.xml"
  
       // then read file as input stream and copy stream to accessible temporary file
       val haarCascadeIns = javaClass.getResourceAsStream(haarRelativePath)
  
       // Declare default temporary file location in Android
       var tmpDir = System.getProperty("java.io.tmpdir")
  
       // JNI now can access temporary file and utilize model
       val tmpFile =  File(tmpDir, "haarcascade_frontalface.xml")
       haarCascadeIns.use { input ->
           tmpFile.outputStream().use { output ->
               input?.copyTo(output)
           }
       }
  

• haarCascadePath, or Cascade Classifier temp location, would be at /data/user/0/com.example.yourapplicationname/cache/classifier[some random number]haarcascade_frontalface . Then I can use this path in CascadeClassifier::load() function in JNI

         // Get absolute path to "tmpFile" and pass it to JNI function 
         val haarCascadePath = tmpFile.absolutePath

         // Other way to get file path
         val haarCascadePath =  File(tmpDir, "haarcascade_frontalface.xml")