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POreturn _cv.cvHaarDetectObjects(*args)
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  1. POreturn _cv.cvHaarDetectObjects(*args)
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    copied!<p>I am trying to detect the face from the webcam using opencv python on ubuntu. I got this online code and tried running this program and I am getting the as NULL array pointer is passed, I guess it is not able to capture the video from webcam but with the same code(only capture camera) I got the camera on and it captured the video. Here is my code:</p> <pre><code>import cv from opencv import highgui HAAR_CASCADE_PATH = "/home/OpenCV-2.3.1/data/haarcascades/haarcascade_frontalface_default.xml" CAMERA_INDEX = 0 def detect_faces(image): faces = [] detected = cv.HaarDetectObjects(image, cascade, storage, 1.2, 2, cv.CV_HAAR_DO_CANNY_PRUNING, (100,100)) if detected: for (x,y,w,h),n in detected: faces.append((x,y,w,h)) return faces if __name__ == "__main__": cv.NamedWindow("Video", cv.CV_WINDOW_AUTOSIZE) capture = cv.CaptureFromCAM(0) storage = cv.CreateMemStorage() cascade = cv.Load(HAAR_CASCADE_PATH) print cascade faces = [] i = 0 c = -1 while (c == -1): image = cv.QueryFrame(capture) # Only run the Detection algorithm every 5 frames to improve performance #if i%5==0: faces = detect_faces(image) #print image for (x,y,w,h) in faces: cv.Rectangle(image, (x,y), (x+w,y+h), 255) cv.ShowImage("w1", image) i += 1 </code></pre> <p>And Error I am getting is:</p> <pre><code>Traceback (most recent call last): File "/home/OpenCV-2.3.1/webcam_try.py", line 38, in &lt;module&gt; faces = detect_faces(frame) File "/home/OpenCV-2.3.1/webcam_try.py", line 13, in detect_faces detected = cv.cvHaarDetectObjects(frame, cascade, storage, 1.2, 2, cv.CV_HAAR_DO_CANNY_PRUNING,(100,100)) File "/usr/lib/pymodules/python2.7/opencv/cv.py", line 1626, in cvHaarDetectObjects return _cv.cvHaarDetectObjects(*args) NotImplementedError: Wrong number of arguments for overloaded function 'cvHaarDetectObjects'. Possible C/C++ prototypes are: cvHaarDetectObjects_Shadow(CvArr const *,CvHaarClassifierCascade *,CvMemStorage *,double,int,int,CvSize) cvHaarDetectObjects_Shadow(CvArr const *,CvHaarClassifierCascade *,CvMemStorage *,double,int,int) cvHaarDetectObjects_Shadow(CvArr const *,CvHaarClassifierCascade *,CvMemStorage *,double,int) cvHaarDetectObjects_Shadow(CvArr const *,CvHaarClassifierCascade *,CvMemStorage *,double) cvHaarDetectObjects_Shadow(CvArr const *,CvHaarClassifierCascade *,CvMemStorage *) </code></pre>
 

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