Abstract: The authors investigate raw pixel redundancy caused by repainting application’s graphical objects and propose an application-specific graphical caching scheme to recognize and reduce this class redundancy. Effectiveness of the scheme is proved by implementation in frame buffer based thin-client system VNC. The experimental results show that the scheme could reduce about 17.8%-22.7% network traffic and most of high latencies caused by screen redundancy for the tested scenarios. Meanwhile the scheme costs only little additional computation and memory resource.

Key words: thin-client computing, screen redundancy, application-specific graphical caching, bandwidth optimization

摘要： 研究由重绘应用程序的图形对象产生的像素冗余, 提出利用应用特定缓存机制识别并减少此类冗余, 并在 VNC 系统中实现了这一机制。试验表明该机制能够减少约17.8%~22.7%的网络通信, 并能降低大部分由此类冗余引起的高延迟;同时该机制还具有较低的计算及存储开销。

关键词: 瘦客户计算, 屏幕冗余, 应用特定图形缓存, 带宽优化