| Aiming at the problem of low compression rate in time series data representation,firstly,the definition of time series and nine basic forms of time series are given. Then,through the optimization of extreme points,the key extreme points and the extreme points with slight changes are proposed,and the IRAKPTS algorithm combined with the turning point algorithm is given. Finally,it is verified by experiments that the time series data of the IRAPKTS algorithm retains the contours of the time series well and improves the compression efficiency. |