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1. (WO2017156815) IMPROVED METHOD FOR GENERATING HALFTONE PROJECTION AND MODEL FOR 3D PRINTING

Pub. No.:    WO/2017/156815    International Application No.:    PCT/CN2016/079176
Publication Date: Fri Sep 22 01:59:59 CEST 2017 International Filing Date: Thu Apr 14 01:59:59 CEST 2016
IPC: G06T 17/30
Applicants: SHANDONG UNIVERSITY
山东大学
Inventors: CHEN, Baoquan
陈宝权
COHEN.OR, Daniel
科恩奥⋅丹尼尔
LISCHINSKI, Dani
里奇斯⋅达尼
LV, Lin
吕琳
SHARF, Andrei
沙夫⋅安德雷
WEI, Yuan
魏源
ZHAO, Haisen
赵海森
Title: IMPROVED METHOD FOR GENERATING HALFTONE PROJECTION AND MODEL FOR 3D PRINTING
Abstract:
An improved method for generating halftone projection and a model for 3D printing, the method comprising: calculating an reference projection image by using a project simulation method according to a given three-dimensional model, a projection receiving surface and basic parameters of a light source; correcting a given grayscale image to obtain an illuminance diagram; corresponding points in the illuminance diagram to the reference projection image; normalizing to obtain a density graph by means of calculation; using a Voronoi division method having capacity constraints to provide an optimal circle permutation according to the density graph; and according to the type of a hole as determined by the optimal circular permutation, determining the corresponding size and position of the hole as well as the direction and angle of the light source, and generating a physical model for 3D printing. By means of the present method, the light source transmits through the hole on the model to form a continuous grayscale image which is closest to the given grayscale image, and no obviously visible discrete spot is present.