Aiming at the problems that the existing navigation line extraction algorithm of the automatic navigation system based on machine vision is susceptible to the interference of the external environment and the slow processing speed, the paper proposes a navigation line extraction method based on the linear scanning of the image. The linear scanning navigation line extraction algorithm proposed in the paper takes the bottom edge of the image as the starting point selection range of the crop line straight line, and the top edge as the end point selection range of the straight line, selects two points at each of the top and bottom edges of the image, and then controls the upper and lower end point positions to produce straight lines with different slopes, counts the number of target points that fall within a certain region of the straight line, and finally takes the straight line that contains the largest number of target points as a straight line of the crop line and calculates a navigation line based on the crop line straight line to obtain a navigation line. Finally, the line containing the most target points is taken as the crop line line, and the navigation line is calculated according to the crop line line.
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Zhang et al. (2024) studied this question.
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