Abstract
In order to meet the requirements of high-precision measurement, the method of improving camera calibration is studied. In the calibration process, the quality of the calibration image, the extraction accuracy of the calibration image corner and the nonlinear optimization effect of the camera linear parameters directly affect the calibration accuracy. First of all, in order to solve the problems in image acquisition, especially in the case of over exposure, an adaptive gamma correction method is designed to automatically adjust the image brightness, and enhance the contrast of black and white grid to improve the image acquisition quality. Secondly, a sub-pixel corner extraction algorithm based on homography matrix mapping is designed, which overcomes the error and omission of Harris corner extraction algorithm, and improves the accuracy of corner extraction. At last, adaptive weight and mutation particle swarm optimization algorithm are studied to optimize the camera parameters. Compared with other optimization algorithms, this optimization algorithm needs less parameter settings, fast convergence speed, and can obtain more accurate camera parameters. The average calibration error is 0.038 pixels.
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