The Methods of the High Speed Saying for the Astronomical Image

The astronomical image collection should be realtime and high-speed. Three methods including the virtual disk, the Expand Memory and the Extend Memory for doing this by using a simple image collection equipment such as the video CCD with a single frame image card are introduced and analysed in this paper.The program design for each method is also discussed. Finally, the comparison among those methods is given for discussion of the advantages with each method.