Calibrating problem?

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  • #116328

    Hello, I am trying to set up a Sandbox and I am not obtaining exactly what I expected. . .
    I have a couple of questions to ask about the calibration process, I need to show a bunch of pics taken on my installation.

    General setup

    This is just to show the setup
    Then a couple of question about this image:


    First of all why the top horizontal line is not actually a line? (blue arrows)
    What did I do wrong? The measure of 3D points?
    Second: why is that top left corner going so up? (red arrow)
    When actually there is no sand on that corner you can see in the following pics

    lateral view
    another view

    How can I fix those things?

    Oliver Kreylos

    The top border (or any border) is not supposed to be a line. It may be close to a line if the entire surface seen by the Kinect camera is completely flat, but even then there may be some distortion. If there is any topography, the boundaries will be cross-sections through the terrain at the edges of the camera’s field of vision.

    The first-generation Kinect camera has bowl distortion. If you point it at a completely flat surface, the corners of the reconstruction will bend towards the camera. You can reduce that distortion by performing per-pixel depth correction, as described in step 6a in the installation instructions.

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