Abstract: Because of being restricted by the physics rule during the forming process，ocean wave presents feebleness fringe approximately paralleled to the coasting.Contrary，objects present stronger fringe in all directions.Based on the different imaging characteristic between ocean wave and objects，this paper brings forward segmenting those regions of interest in one frame of image using Sobel arithmetic operators，and then detecting the moving targets in those regions of interest based on the moving of the center of the interested region.Experimental results show that the method can minish the probability of dis-detecting and leak-detecting，and detect the moving targets robustly and accurately.

Key words: imaging characteristic, sobel arithmetic operators, regions of interest, center

摘要： 海浪由于在形成过程中受到物理规律的制约，从而呈现与海岸线近似于平行的弱边缘。相反的，物体则在各个方向上表现出比较强的边缘性。根据海浪和物体的这种不同成像特性，提出在单帧图像中采用Sobel算子计算梯度图像从而分割出感兴趣区域，然后从感兴趣区域出发，根据连续帧间的感兴趣区域的中心点是否移动来判断物体是否运动，从而找出运动的目标。实验表明，该方法鲁棒性好，能有效地减小误检和漏检的概率，较准确地检测到海上的运动目标。

关键词: 成像特性, Sobel算子, 感兴趣区域, 中心点