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