Curvilinear polygon image scaling method, system and electronic apparatus

Abstract

The curvilinear polygon image scaling method includes: placing partial derivatives at points on edges of a curvilinear polygon image to obtain a vector gradient field; integrating the vector gradient field to obtain an auxiliary grayscale image; segmenting the edges; modulating, on the auxiliary grayscale image, to grayscale values of edgelets based on the image scaling parameter and vector gradient field and modulating to nearby grayscale values using a smoothing function to obtain an updated auxiliary grayscale image; intercepting the updated image using a threshold and extracting a polygon contour. If differences between edge placement errors of edgelets, that are between the currently extracted and the original curvilinear polygon image, and the image scaling parameter are less than the preset small value, then the currently extracted contour is used as a scaled image; otherwise, modulating iteratively until the difference is less than the preset small value.