研究了一种用彩色条纹对光栅进行数字编码的方法。其中投影光栅用白、红、绿、蓝和它们的补色黑、青、品、黄按照四位二进制原理对光栅进行编码。用白色和黑色条纹分别表示八位上的1和0；用红色和青色条纹分别表示四位上的1和0；用绿色和品色条纹分别表示二位上的1和0；用蓝色和黄色条纹分别表示个位上的1和0。这样在一个周期中共有64个条纹。这样的空间周期能够胜任一般物体的测量。由于每个颜色的条纹只有一个逻辑状态，所以这种方法具有较好的抗干扰能力。

A method of digital coding of grating by using color strips is presented. White, red, green, blue and their complementary colors, black, cyan, magneta and yellow are used to code the grating based on the binary system. The white and the black stripes are used to represent 1 and 0 on the fourth bit, red and cyan to represent 1 and 0 on the third bit, the green and magenta to represent 1 and 0 on the second bit and the blue and yellow to represent 1 and 0 on the first bit of the binary system, respectively. There are 64 stripes in one period. The space period of the projection grating is large enough for measuring the surface profiles of normal objects. Since each strip has only one logical state, the system possesses good disturbance-resistance.