Panoramic sea-sky line extraction based on improved hough circle transform

Sea-sky line extraction is very important for the detection of dim targets appeared near the area of sea-sky line. Aiming at the complexity of panoramic image and the characteristic that the sea-sky-line in panoramic image shows as a nearly circle, a novel sea-sky line extraction algorithm based on improved Hough circle transform is proposed in this paper. Firstly, the edge of image is detected and the interference points in binary edge image are removed by calculating the fractal dimension of the image, then the panoramic sea-sky line can be extracted by finding the optical center and radius. Experimental results show that this algorithm can effectively extract the sea-sky lines in panoramic images.