Faculty of Applied Engineering Department Electromechanics, Universiteit Antwerpen, Groenenborgerlaan 171, 2020 Antwerpen, Belgium.
Sensors (Basel). 2019 Jan 10;19(2):246. doi: 10.3390/s19020246.
In order to determine camera parameters, a calibration procedure involving the camera recordings of a checkerboard is usually performed. In this paper, we propose an alternative approach that uses Gray-code patterns displayed on an LCD screen. Gray-code patterns allow us to decode 3D location information of points of the LCD screen at every pixel in the camera image. This is in contrast to checkerboard patterns where the number of corresponding locations is limited to the number of checkerboard corners. We show that, for the case of a UEye CMOS camera, the precision of focal-length estimation is 1.5 times more precise than when using a standard calibration with a checkerboard pattern.
为了确定相机参数，通常需要进行涉及相机记录棋盘格的校准过程。在本文中，我们提出了一种替代方法，使用在 LCD 屏幕上显示的格雷码模式。格雷码模式允许我们在相机图像的每个像素处解码 LCD 屏幕上的点的 3D 位置信息。这与棋盘格模式形成对比，在棋盘格模式中，对应的位置数量限于棋盘格角的数量。我们表明，对于 UEye CMOS 相机的情况，焦距估计的精度比使用标准的棋盘格模式校准精确 1.5 倍。
