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Shape-refinement of triangular three-dimensional mesh using a modified shape from shading (SFS) scheme

A technology of triangles and grids, applied to the details of processing steps, graphics and image conversion, 3D image processing, etc., can solve problems such as low efficiency and time consumption

Pending Publication Date: 2021-12-21
SONY CORP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This causes unnecessary time consumption and can be computationally inefficient, especially for memory / processing constrained systems

Method used

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  • Shape-refinement of triangular three-dimensional mesh using a modified shape from shading (SFS) scheme
  • Shape-refinement of triangular three-dimensional mesh using a modified shape from shading (SFS) scheme
  • Shape-refinement of triangular three-dimensional mesh using a modified shape from shading (SFS) scheme

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Embodiment Construction

[0014] Embodiments described below can be found in the disclosed apparatus and method for shape refinement of triangular three-dimensional (3D) meshes using a modified shape from shading (SFS) scheme. An exemplary aspect of the present disclosure provides an electronic device for shape refinement of a triangular 3D mesh of an object part, such as a human face part. The disclosed electronic device is configured to model details (eg, facial details) of an initial triangular 3D mesh by using a modified SFS scheme. The initial triangular 3D mesh together with corresponding texture maps and color images of object parts can be used to estimate a final 3D triangular mesh from the initial triangular 3D mesh as a shape-refined 3D triangular mesh. An orthographic projection is employed to project the initial triangular 3D mesh onto a 2D image plane with a square grid. A modified shape from shadow recovery (SFS) scheme is further applied to re-estimate the z-coordinate value of each ver...

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Abstract

An electronic apparatus and method is provided for shape-refinement of a triangular 3D mesh using a modified Shape from Shading (SFS) scheme. The electronic apparatus generates a flat two-dimensional (2D) mesh based on an orthographic projection of an initial three-dimensional (3D) triangular mesh on an image plane that includes a plurality of square grid vertices. The electronic apparatus estimates a final grid depth value for each square grid vertex of the flat 2D mesh based on a modified SFS scheme. The modified SFS scheme corresponds to an objective relationship among a reference grid image intensity value, an initial grid depth value, and a grid albedo value for each square grid vertex of the plurality of square grid vertices. The electronic apparatus estimates a final 3D triangular mesh based on the initial 3D triangular mesh and the estimated final grid depth value.

Description

[0001] Cross Reference / Incorporation by Reference to Related Applications [0002] none. technical field [0003] Various embodiments of the present disclosure relate to three-dimensional (3D) modeling, virtual human technology, and virtual reality. More specifically, various embodiments of the present disclosure relate to electronic devices and methods for shape refinement of triangular 3D meshes using a modified shape from shading (SFS) scheme. Background technique [0004] Advances in the fields of three-dimensional (3D) computer graphics and 3D modeling have paved the way for the development and visualization of realistic 3D models of different types of objects (e.g., human faces) in 3D environments such as computer-generated imagery (CGI) environments . Typically, a 3D model of an object of interest can be rendered from a 3D mesh that uses polygonal surfaces to define the shape and geometry of the object of interest. In order to generate a realistic 3D model of an ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20G06T7/507G06T15/50
CPCG06T17/20G06T7/507G06T15/50G06T19/20G06T2219/2021G06T2207/10016G06T2207/10024G06T2200/08G06T2207/30201G06T15/80G06T3/067
Inventor 胡捷M·格哈拉维-阿尔克汉萨利
Owner SONY CORP
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