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Asked: 2026-05-24T17:08:51+00:00

I wrapped opencv today with simplecv python interface. After going through the official SimpleCV

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I wrapped opencv today with simplecv python interface. After going through the official SimpleCV Cookbook I was able to successfully Load, Save, and Manipulate images. Thus, I know the library is being loaded properly.

However, under the Using a Camera, Kinect, or Virtual Camera heading I was unsuccessful in running some commands. In particular, mycam = Camera() worked, but img = mycam.getImage() produced the following error:

In [35]: img = mycam.getImage().save()
OpenCV Error: Bad argument (Array should be CvMat or IplImage) in cvGetSize, file /home/jordan/OpenCV-2.2.0/modules/core/src/array.cpp, line 1237
---------------------------------------------------------------------------
error                                     Traceback (most recent call last)

/home/simplecv/<ipython console> in <module>()

/usr/local/lib/python2.7/dist-packages/SimpleCV-1.1-py2.7.egg/SimpleCV/Camera.pyc in getImage(self)
    332 
    333         frame = cv.RetrieveFrame(self.capture)
--> 334         newimg = cv.CreateImage(cv.GetSize(frame), cv.IPL_DEPTH_8U, 3)
    335         cv.Copy(frame, newimg)
    336         return Image(newimg, self)

error: Array should be CvMat or IplImage

I’m running Ubuntu Natty on a HP TX2500 tablet. It has a built in webcam, (CyberLink Youcam?) Has anybody seen this error before? I’ve been all over the web today looking for a solution, but nothing seems to be doing the trick.

Update 1: I tested cv.QueryFrame(capture) using the code found here in a separate Stack Overflow question and it worked; so I’ve pretty much nailed this down to a webcam issue.

Update 2: In fact, I get the exact same errors on a machine that doesn’t even have a webcam! It’s looking like the TX2500 is not compatible…

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1 Answer

  1. Editorial Team

    To answer my own question…

    I bought a Logitech C210 today and the problem disappeared.
    I’m now getting warnings:

    Corrupt JPEG data: X extraneous bytes before marker 0xYY.

    However, I am able to successfully push a video stream to my web-browser via JpegStreamer(). If I cannot solve this error, I’ll open a new thread.

    Thus, for now, I’ll blame the TX2500.
    If anybody finds a fix in the future, please post.

    Props to @HYRY for the investigation. Thanks.

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