一种改进的彩色打印机校正方法

摘要

提出一种基于改进的四面体插值技术的校正方法.根据给定点将L*a*b*样本分区,通过比较体积找出包含给定点的体积最小的四面体,利用四面体插值及各顶点信息完成L*a*b*到设备空间的转换.实验过程中对打印机进行校正,采用多项式回归及神经网络等方法与该算法进行比较,结果显示该算法的平均误差小于其他2种算法,可以应用到彩色设备的校正中.%A calibrating method based on tetrahedron interpolation is proposed.Because the sampling data is irregularly distributed in L*a*b* space, it is hard to construct 3D look-up-table for color conversion, which restricts the use of 3D interpolation in calibration algorithms.Consequently, an optimal vertex-finding algorithm in L*a*b* space is developed for constructing tetrahedrons, and the tetrahedron with smallest volume and enclosing the given point are selected, which is used to take the conversion from L*a*b* to device space.Experimental result shows the average error is less than regression and neural network method, which indicates that it can be used to calibrate most of the color devices.