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Camera Calibration: A Quick and Easy Way to Determine the Scale Factor
December 1991 (vol. 13 no. 12)
pp. 1240-1245

The author presents a quick and easy solution to the camera calibration problem of finding the scale factor that arises because of a difference between the scanning frequency of the camera sensor plane and the scanning frequency of the image capture board frame buffer. The method presented is based on the observation that the scale factor is related to the distortion in an image of a circle: this is a distortion that can easily be measured by considering the occluding boundary of a precisely fabricated sphere, such as a ball bearing. Implementation results are presented.

[1] R. K. Lenz and R. Y. Tsai, "Techinques for calibration of the scale factor and image center for high accuracy 3-D machine metrology,"IEEE Trans. Patt. Anal. Machine Intell., vol. 10, no. 5, pp. 713-720, Sept. 1988.
[2] R. Y. Tsai, "An efficient and accurate camera calibration technique for 3-D machine vision," inProc. IEEE Comput. Soc. Conf. Comput. Vision Patt Recogn.(Miami, FL), 1986, pp. 364-374.

Index Terms:
image sensors; scale factor; camera calibration; camera sensor plane; scanning frequency; image capture board frame buffer; distortion; occluding boundary; ball bearing; calibration; cameras; image sensors
M.A. Penna, "Camera Calibration: A Quick and Easy Way to Determine the Scale Factor," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 13, no. 12, pp. 1240-1245, Dec. 1991, doi:10.1109/34.107007
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