本程序用于区分海面舰船与海水。应用算法为小区域方差对比，程序简单，适用于初学者参考的例程。主程序为var.m，dxout.m为方差计算程序。其余图片为测试图片。-This procedure is used to distinguish sea ships with seawater. Application algorithm for small regional variance contrast, simple procedures, suitable for beginners reference routine. The main program is var.m, dxout.m variance calculation procedures. The rest of the picture for the test image.