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Analyzing the influence of camera temperature on the image acquisition process

This article presents an analysis of thermal influences on the image acquisition process of an electronic camera. It is shown that temperature changes lead to thermal expansion of the mechanical camera components and thus to a displacement of the camera sensor and/or to a displacement of the center of projection. This change in the imaging geometry leads to changing camera parameters which have to be adjusted if the camera is used for high accurate measurements. The slight change in the imaging geometry can be determined by an analysis of the optical flow of a static calibration pattern. The dependency between temperature change and the change of the camera parameters can be modeled using methods from linear time invariant system theory. Once the model is determined for a specific camera it can be used for adjusting the camera parameters according to the current temperature and thus increasing the accuracy of an optical measurement device.