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An Improved Halftone Projection and Model Generation Method for 3D Printing

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

Active Publication Date: 2018-11-13
SHANDONG UNIV
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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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  • An Improved Halftone Projection and Model Generation Method for 3D Printing
  • An Improved Halftone Projection and Model Generation Method for 3D Printing
  • An Improved Halftone Projection and Model Generation Method for 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] Such as 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 inc...

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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.

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 Patents(China)
IPC IPC(8): G06T17/30G06T15/00G06T15/55B29C67/00B33Y10/00
CPCG06T17/30
Inventor 吕琳赵海森陈宝权魏源
Owner SHANDONG UNIV
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