本程序用于森林视频监控中天地分界线的确定，确定后对于天地线上方部分都认为是天空不进行处理，可提高视频处理效率和系统的性能。-The procedure for forest video surveillance to determine the boundary between heaven and earth. The part above the line side is considered as sky, do nothing to which. It can improve the video processing efficiency and system performance.