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face detection (via Python bridge) [message #93872]

Mon, 14 November 2016 06:47

markb77
Messages: 217
Registered: July 2006

Senior Member

hi,

I'm having some trouble using the IDL-Python bridge. I'm trying to run the face detection example from this blog post:

https://realpython.com/blog/python/face-recognition-with-pyt hon/

but my code is crashing at the point where it tries to detect the faces.

Here is the code:

pro test_python_face_detect

cv2 = Python.Import('cv2')

imagePath = 'C:\temp\FaceDetect\abba.png'
cascPath = 'C:\temp\FaceDetect\haarcascade_frontalface_default.xml'

; Create the haar cascade
faceCascade = cv2.CascadeClassifier(cascPath)

; Read the image
image = cv2.imread(imagePath)
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

; Detect faces in the image

faces = faceCascade.detectMultiScale(gray,scaleFactor=1.1, $
minNeighbors=5,minSize=[30,30], $
flags = cv2.cv.CV_HAAR_SCALE_IMAGE)

end

The error I'm getting is:

% PYTHON_CALLMETHOD: Exception: Required argument 'rejectLevels' (pos 2) not found.

The code works fine when run from Python.

I think it's likely that there are multiple things going wrong with my code. One of them is that IDL is not recognizing that I'm calling the detectMultiScale method using another calling convention (there are two different ways of calling detectMultiScale, for some reason). See the docs here:

http://docs.opencv.org/2.4/modules/objdetect/doc/cascade_cla ssification.html?highlight=detectmultiscale#cv2.CascadeClass ifier.detectMultiScale

Next, the IDL-Python bridge is not recognizing the keywords correctly, since the keywords are case sensitive.

What else? I don't know.

Does anyone have a suggestion on how to make this work? I would really like to be able to do face detection within IDL.

thanks
Mark

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[Message index]

		face detection (via Python bridge) By: markb77 on Mon, 14 November 2016 06:47
		Re: face detection (via Python bridge) By: Dick Jackson on Mon, 14 November 2016 08:31
		Re: face detection (via Python bridge) By: markb77 on Mon, 14 November 2016 11:21
		Re: face detection (via Python bridge) By: Dick Jackson on Mon, 14 November 2016 15:45
		Re: face detection (via Python bridge) By: lamichhane.rasmi on Wed, 09 August 2017 11:31

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