Global motion compensation coding is a novel coding method based on models.Its coding efficiency is higher than that of conventional coding method with motion compensation

so it is fit for very low bit-rate applications.But the key technology of global motion compensation coding is not solved well at present

such as global motion estimation

so global motion compensation coding has not been applied widely in real-time applications.This paper focuses some research on key problems of global motion compensation coding to solve real-time global motion compensation coding.The new fast method of global motion estimation is proposed and is used in global motion compensation coding

thus the speed of global motion compensation coding is accelerated.Comparative experimental results are shown in the paper.The speed of global motion compensation coding is improved compared with former method of global motion compensation coding.