基于虚拟棋盘的校准精度分析研究

标定目标板是相机标定中必备的材料。针对摄像头与目标标定物之间的距离对标定精度的影响,进行棋盘图分别约占整个屏幕的1/3,1/2,2/3等情况下的相机标定实验。实验结果证明当棋盘图的图像约占整个屏幕的1/3时,标定精度最高,误差最小。针对虚拟标定板对标定精度的影响,设计9×7和13×9两种规格的虚拟标定板;并且对虚拟标定板在约占整个屏幕的1/3的情况下进行标定。结果证明虚拟标定板的标定结果优于同规格的物理标定板。

Research on Calibration Accuracy Based on Virtual Checkerboard

The calibration target board is the necessary material in the camera calibration. For the influence of the distance between the camera and the target calibration object on the calibration accuracy, the image of the checkerboard is about 1/3, 1/2, 2/3 of the whole screen The experiment illustrate that the calibration accuracy is highest when the chessboard chat is about 1/3 of the screen. To quantify the influence of the accuracy made by the virtual calibration plate, the virtual calibration plate with size of 9×7 or 13×9 was designed, and executed the calibration under the condition which the virtual calibration plate is about 1/3 of the screen. The results prove that virtual calibration is superior to the real calibration board with same specification.