Digital art images which is based on the computer graphics is integrated with computer graphics technology and network transmission technology. The design of the system is a new application in the field of digital art. This paper chooses ARM9 (S3C2440) processor as the hardware platform, and computer graphics Linux operating system as the software platform. Then it puts forward an improved algorithm of digital art images based on frame difference, and completes the design of digital art images system that can be applied to the community monitoring or bank safety unattended. The experimental results show that the system can extract the background images from the sequence video, so as to improve the quality of digital art images.