Patent ID: 11893768
Assignee: CENTRAL SOUTH UNIVERSITY
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 9:
10. The method according to claim 1, wherein the step of vertex extraction comprises firstly drawing a skeleton plot with lines having pixel values of 1 by adopting line segments having line widths of 1 pixel; secondly establishing a square window having a size of 5×5 pixels taking a pixel point having a pixel value of 1 as a center point based on the skeleton plot, and if a partial region of the window overflows the skeleton plot, assigning pixel values of all pixel points in the overflowing region to 0, calculating a corner response function value R corresponding to the center point of the window with a Harris algorithm, taking one percent of the maximum value of the corner response function value R as a limit value, and setting a corner response function value R among all corner response function values R in the same window less than the limit value to 0, and repeating the operations to traverse the whole skeleton plot; and thirdly establishing a square window having a size of 3×3 pixels taking a pixel point having a pixel value of 1 and a corner response function value R greater than 0 as a center point, and if the R value of the center point of the window is the maximum value in the window, recording the center point as a vertex, and repeating the operations to traverse the whole skeleton plot.