一种基于分块采集和压缩技术的屏幕共享方案

A Screen Sharing Scheme Based on Block Collection and Data Compression

在深入研究现有的屏幕共享方法的基础上,在实际的远程教学系统的项目实践过程中提供了一种基于分块采集和压缩技术的解决方案。该方案主要利用分块采集和数据压缩技术来实现异地屏幕显示图像的共享,即首先使用划分的思想把屏幕分成一些固定的块,然后分块采集屏幕图像,对采集的图像进行分析,从而决定采用哪一种技术进行压缩,然后打包传输。针对图像发生变化的块数来决定采用何种压缩技术,主要有LZW和RLE数据压缩技术。实验证明,该方案不仅可以获得很好的压缩率,并且具有较好的实时性和较低的编码复杂度,因此,应用前景广泛。

After the deep research of the existing methods of the screen sharlng,proposed an efficient scheme according to the practice of the distance education system, to achieve the high compressed ratio at the same time protecting the nearly lossless visual quality. This scheme is named ＂block collection＂ and includes the two main techniques, one is called block, and the other is the data-compression method called LZW and RLE. The first step of this scheme is to divide the whole screen to many equal blocks and collect the images by block, save them as bitmap formats. The last step is to apply different method to compress different block images. Apply different method according to the change number of the all blocks, there are two methods： LZW and RLE. After experiment, it has good compression ratio, and it has real time performance, moreover, the decode process is fairly simple. So its application prospect is widespread.