Method for automatically generating decorative pattern expansion drawing of rotating symmetric porcelain

Abstract

The invention discloses a method for automatically generating a decorative pattern expansion drawing of rotating symmetric porcelain. The method comprises the steps of first, inputting data information of a model with a two-dimensional texture; second, acquiring an erected model based on a symmetry axis rotating model, and thus acquiring front view of the erected model in the front, rear, left and right directions; third, analyzing the four acquired front views by using a gradient operator so generate a cumulative gradient map of the model; fourth, calculating a model cutting plane on the basis of the acquired cumulative gradient map so as to complete segmented processing for the model; and fifth, performing circular truncated cone fitting on each acquired segmented model; and sixth, judging whether a texture-free special region exists or not in circular truncated cone fitting, and if so, combing the texture-free region with a generated circular truncated cone; and otherwise, expanding the texture at the surface of the circular truncated cone, and generating a planar decorative pattern expansion drawing. Disclosed by the invention is a novel technology in which a decorative pattern at the surface of the porcelain is expanded to a two-dimensional plane from the surface of a three-dimensional utensil based on a method of surface parameterization.

Description

technical field [0001] The invention belongs to the field of computer graphics, and in particular relates to a method for automatically generating a pattern development diagram for rotationally symmetrical porcelain. Background technique [0002] Parameterization of the grid surface: the parameterization of the grid surface refers to the establishment of a mapping relationship, so that the vertices on the grid surface are mapped to the parameter area through this mapping relationship. According to the different parameterization goals, the parameterization methods can be divided into two categories: (1) using coordinate transformation directly; (2) using an auxiliary surface or geometry as an intermediary to achieve parameterization. But mapping a non-developable 3D mesh surface to a plane will inevitably produce distortions in length, area, and angle. Many methods focus on reducing the distortion caused by parameterization while maintaining geometric metrics, such as constr...

AI Technical Summary

Problems solved by technology

But in practice, simply using a cylinder to fit a three-dimensional object cannot solve all the problems well. For the objects we want to deal with, using a cone to fit is a more effective method

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