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Improved halftone projection and model generation method facing 3D printing

A 3D printing and model generation technology, applied in 3D modeling, 3D image processing, instruments, etc., can solve problems such as discrete light and discontinuous projection effects, and achieve a wide range of applications

Active Publication Date: 2016-08-10
SHANDONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its projection effect may be discontinuous, with scattered light spots

Method used

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  • Improved halftone projection and model generation method facing 3D printing
  • Improved halftone projection and model generation method facing 3D printing
  • Improved halftone projection and model generation method facing 3D printing

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0053] like figure 1 As shown, a halftone projection and model generation method for 3D printing includes the following steps:

[0054](1) The user specifies parameters such as the 3D model, the projection receiving surface and the position and size range of the light source, and calculates the projection reference image B through the projection simulation method 0 ;

[0055] (2) For any input grayscale image I t , combined with the projected reference image B 0 , calculate a density map M;

[0056] (3) According to the density map M, the method of Voronoi partition (CCVT) with capacity constraints is used to calculate the optimal circle arrangement;

[0057] (4) According to the arrangement of the circles, corresponding enlarged holes and inclined holes are generated.

[0058] In said step (1), the projection simulation method specifically includ...

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Abstract

The invention discloses an improved halftone projection and model generation method facing 3D printing. The method is characterized by according to a given three-dimensional model, a projection receiving surface and a basic parameter of a light source, using a projection simulation method to calculate a projection reference image, correcting a given gray scale image so as to acquire an illumination image, making a point of the illumination image correspond to the projection reference image, after carrying out normalization processing, calculating to acquire a density graph; using a Voronoi division method with a capacity constraint to carry out optimal circle arrangement according to the density graph; according to a hole type determined by the optimal circle arrangement, determining a size of the corresponding hole, a position and a relative light source orientation angle, generating a physical model and carrying out 3D printing. In the invention, a continuous gray scale image which is most similar to the given gray scale image is formed on the projection receiving surface by the light source permeating the hole on the model and there is no obvious discrete spot.

Description

technical field [0001] The invention relates to an improved halftone projection and model generation method oriented to 3D printing. Background technique [0002] 3D Printing (3D Printing), also known as Additive Manufacturing (AM), Rapid Prototyping (Rapid Prototyping), etc., is a technology based on the principle of discrete accumulation and the method of accumulating materials layer by layer to manufacture physical parts. 3D printing can use metal, photosensitive resin, plastic and other materials, and directly use digital model files as input to manufacture three-dimensional entities of any complex shape, which is suitable for customizable manufacturing. [0003] A continuous tone image refers to a true-color image with continuous changes in hue, brightness, and saturation on an image. The continuous change is formed by the density of imaging material particles per unit area, such as a CRT display. The shades of continuous tone images are stepless. The corresponding ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/30G06T15/00G06T15/55B29C67/00B33Y10/00
CPCB29C67/0007B33Y10/00G06T15/506G06T15/55G06T17/30
Inventor 吕琳赵海森陈宝权魏源
Owner SHANDONG UNIV
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