This paper describes one valid framework of integrating intensity discontinuity and edge continuity for image Straight-line Extraction. First, multiple "edge contours" are traced out from digital image by means of classic LOG algorithm and contour tracing principle. In this step, Zero-Cross points are detected without implementing traditional "edge labeling" procedure and thus, contour tracing procedure can take advantage of adjacency continuity retained between edge points; After that, Hough-based heuristic linking algorithm is developed to extract initial straight-line segments from "edge contour" respectively. In this step, important knowledge, e.g., "seed" point and direction of straight-line segments, is deduced from Hough transformation; Finally, initial straight lines are testified and improved with Least Squares Template Matching (LSTM) technique by estimating the similarity of intensity distribution between image patch of initial straight-line segment and its ideal intensity template. The experiment of extracting straight-line segments from aerial video image demonstrates that the proposed approach is robust and effective. Contributions are also concluded.
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