Research on the location of sea-sky line under infrared complicated sea-sky background has the important value to
improve the capability of far target recognition. In a real sea-sky background infrared image, the sky and the sea
normally appear in the form of different changes of grey-level on account of their different infrared radiation and
reflection characteristics. So we can use the background complex degree to differentiate between the sky region and the
sea region. In our method, an operator is employed to calculate the background complex degree of image. By filtering
original infrared image with the operator, the grey-level contrast between the sky region and the sea region can be
stronger than original image. After the complex degree calculation, the edge detection with only row directional gradient
and Hough transform are utilized in succession, the sea-sky line can be located. Some typical sea-sky background
infrared images are selected to validate our proposed method. The experimental results indicate that our sea-sky line
location method is robust.
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