Proceedings PaperCamera calibration using Postscript interference patterns
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This paper presents a new simple practical method for estimating the horizontal scale factor and/or the pixel aspect ratio of a standard imaging system that uses a CCD or CID video camera. The method uses a self-aligning target pattern that can be produced by a conventional 300 dpi laser printer. It requires only three one-dimensional measurements from a single image - one of which is the null of an interference pattern - and does not depend on exact knowledge of the focal length of the lens or the working distance of the camera. It does not require the use of an oscilloscope or removal of the anti-aliasing filter on the output of the camera. In addition to finding the scale factor, the same target pattern is useful for orienting the camera about its optical axis.