computing formula
4.Firstly we introduce the illumination Model and color-computing formula commonly used in CIG, secondly we propose a method in designing color-computing unit in CIG system and its realization technigue with FPGA.
9.The article analyses the traditional principle of arc coil automatic tuning, points out its limitation,sets an automatic tuning method of external signal scanning frequency arc coil, states the principle and computing formula of external signal scanning frequency and measuring,and eliminates the wearing to the contact point and the limitation of shift adjustment .

