Patent ID: 11954895
Assignee: CHENGDU UNIVERSITY OF INFORMATION TECHNOLOGY
Field: Computer technology (Electrical engineering)
Classification: CPC G  Y | IPC G

Claim 3:
4. The method for automatically identifying south troughs by Laplace operation according to claim 3, wherein a specific implementation mode of S7 is as follows:
S7-1: establishing a rectangular coordinate system at a central point of an inscribed ellipse of a merged contour, wherein the included angle between the major axis of the inscribed ellipse of the merged contour and the x-axis is a target angle of direction, and the ratio of the length of the major axis to that of the minor axis of the inscribed ellipse of the merged contour is the ratio of the major and minor axes;
S7-2: reserving contours with an angle of direction being less than 90° and the ratio of the major and minor axes of the inscribed ellipse being greater than 2 in all merged contours as effective targets;
S7-3: determining whether expansion and erosion times reach 100 times; if the expansion and erosion times reach 100 times, proceeding to S7-4; otherwise, increasing expansion times by 5 times and proceeding to S6;
S7-4: determining whether the number of the effective targets is 0; if the number of the effective targets is 0, indicating that there is no south trough in the geopotential height field, and finishing determination; otherwise, proceeding to S7-5; and
S7-5: acquiring all current effective targets.