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Camera Calibration by Ray Tracing

Article of Honda R&D Technical Review Vol.17 No.1

Summary

A highly accurate method of camera calibration which works by tracing the light rays incident on the camera has been developed. In this method, the relative position of the point light source is adjusted to position the point light source image in the center of each pixel. Afterwards, the relative distance to the point light source is changed and the relative position of the point light source is adjusted again. A three-dimensional locus of the incident rays to the two point light sources obtained is then estimated from the relative positions. This procedure can be used to determine the relative positions of multiple cameras. The accuracy of the method was verified by calibrating a stereo camera and estimating the three-dimensional position of the point light source. The camera calibration method displayed identical accuracy for an image across an irregularly warped shield, which is conventionally a difficult condition for calibration, as when no shield was present. In addition, it was confirmed that there was deviation from the pinhole camera model (no crossing of incident rays).

Reference

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Author (organization or company)

Chiaki AOYAMA(Wako Research Center (HGF))

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