Solar Observations result in amount of data flow. In order to save storage space and network bandwidth

an xDM standard compatible PGF compression encoder is designed for the real-time image compression of solar image. First of all

the PGF compression algorithm which has great advantage over natural image compression and speed is analyzed and customized

and then a PGF compression encoder according to the interfaces required by xDM standard is designed. Against the features of the DaVinci hardware architecture

the PGF compression encoder is optimized on many implementations aspects such as software design

c language program and linear assembly language program. Finally

a real-time online testing has been carried out on the performance parameters such as ratio

time and SNR of the PGF compression encoder. Experiment result shows that the PGF compression encoder fully meets the design requirements of the real-time imaging processing system of solar telescope.