针对红外图像中海天线的特点，提出一种基于图像分割的海天线提取方法。首先通过模板运算对图像进行预处理，以增强海天区域的图像梯度值，然后在竖直方向对图像进行分割，以定位局部海天线，最后用直线拟合法找出海天线位置。实验结果表明，该方法可以快速有效地检测出海天线位置，易于工程应用。

Through analyzing characteristics of infrared image, this article introduces a sea-sky-line extraction algorithm based on image division. Firstly, the image preprocessing is taken by applying big-sacle filtering to enhance the gray gradient in sea-sky-line area. Secondly, image segmentation in the vertical direction is used to identify local sea-sky-line position. Finally, sea-sky-line position is identified by using straight line fitting algorithm. The experimental result showed that the method can locate sea-sky-line efficiently and correctly and can be used for engineering application.