Three-dimensional human modeling method by using cartographical sketching

Abstract

The invention provides a three-dimensional human modeling method by using cartographical sketching, comprising the following steps of: 1. analyzing a sketch: decomposing a human sketch into a skeleton stroke set Ss, an outline stroke set Sp and a thread stroke set Sc; 2. extracting the model characters: extracting a human skeleton structure on a predefined human mesh model MH; 3. recovering the depth: identifying a thread determination result on the thread stroke set according to the skeleton structure and calculating the three-dimensional posture according to the human skeleton structure based on the two-dimensional human posture; and 4. reconstructing three dimension: deforming the section outline characteristics of four limbs and a trunk mesh model. By using the cartographical sketching to draw human front elevation skeleton and outline and directly generating the three-dimensional mesh model, the invention accords with the plane drawing habit of an animation role designer, simplifies the human modeling flow and greatly reduces the time for users to construct human models.

Description

technical field [0001] The invention relates to a method for generating a three-dimensional human body model, in particular to a method for generating a three-dimensional human body model by using hand-drawn human body sketches. Background technique [0002] In recent years, 3D virtual characters have been widely used in the fields of industry, military, biopharmaceutical and education. At the same time, 3D character modeling technology plays an increasingly important role in games, movies and multimedia. Looking for a simple and effective The method of constructing 3D human body model has become an important topic in the field of computer graphics. [0003] Existing avatar construction methods are mainly divided into three categories: creation, reconstruction, and interpolation. Most of these methods start with the authenticity of the constructed human body model, based on the actual human body structure, according to the reality level of the human body: skeleton, muscle, ...

AI Technical Summary

Problems solved by technology

However, the template data used in this method comes from scanned images of corpses. On the one hand, complex image recognition processes are required to construct templates, which limits the diversity of templates; on the other hand, the definition of human body templates is relatively simple, so it can only represent partial human pose

At the same time, this method deforms through the specified human body template, which cannot accurately reflect the user's drawing intention

[0006] To sum up, hand-drawn sketches are an effective way to create 3D human body models, but the existing 3D human body model creation methods based on a single sketch have great limitations on the characteristics of the human body. For example, the expansion body modeling method limits the depth parameters of the human body. It is a fixed value, which cannot reflect the physiological characteristics of the human body such as fat and thin; Chen Mao's template-based method has a simple template definition, and cannot automatically select a suitable human body template for deformation, so it cannot express the user's exaggerated drawing intention

Obviously, these methods cannot support users to design shapes more freely

In practical applications, when users use hand-drawn sketches to express three-dimensional human bodies, they usually use a progressive drawing method to describe the human body in the order of human skeleton-skin / muscle outline-detail lines. Therefore, in the process of human sketch modeling, it is necessary to Modeling the skeleton and skin separately requires that the template used must be a hierarchical template; at the same time, when users draw a human body, they often reflect the physiological characteristics of the human body through the drawn human body structure, while the existing sketch-based 3D creation method does not These characteristics are not fully utilized. Therefore, how to capture the physiological characteristics of the human body reflected in the user's drawing process, and how to organically combine these characteristics with the template selection process and provide users with free sketching methods is an important issue for the interactive creation of 3D human body models by hand-drawn sketches. topic

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