Abstract
Abstract. The paper presents a method for calibration of digital cameras based on the use of a flat test object. The main distinctive feature of this method is that the camera is fixed and does not change its position in space. A series of images of a flat test object (for example, a chessboard) is taken at various distances and inclination of the test object. One should tilt the test object relative to the image plane in order to avoid ambiguity in solving the problem. All these images are measured separately, and processing is performed together, counting them as one image with common exterior orientation elements. Experimental studies have shown sufficient efficiency of such calibration, which is easily implemented and gives positive results in comparison with the classical calibration of the camera on a spatial test object. The results of experimental studies on real images have shown that proposed calibration method gives the comparable with conventional method accuracy. Thus, it is possible to use simple and cheap flat calibration test object instead of spatial one. To achieve the maximum result in camera calibration accuracy, use this method to tilt the chessboard at angles in the range of 30–40 degrees to the optical axis of the camera being calibrated.
Highlights
The calibration of digital cameras has been well studied and developed, research in this area continues and will continue because numerous results of calibrations of various cameras show the need to improve the accuracy of calibration
We propose a different approach for calibrating the camera by a flat test object
A chessboard was modeled with the size of 5 x 5 cells, in the coordinates of the nodes of which errors were introduced with an root mean square error (RMSE) equal to 0.08 mm
Summary
The calibration of digital cameras has been well studied and developed, research in this area continues and will continue because numerous results of calibrations of various cameras show the need to improve the accuracy of calibration. V. 2019), you can find a description of the main methods of calibration of digital cameras used today These methods are based on the application of both spatial and flat test objects, using various mathematical models of sensors A chessboard is used as a flat test object in these works This is natural, because it can be manufactured and there are quite a few methods for accurate automatic measurement of the coordinates of the chessboard nodes in the images. All these calibration methods are based mainly on repeatedly imaging the chessboard from different angles and processing all the images together at the same time. We propose a different approach for calibrating the camera by a flat test object
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