Three-D model characteristic line pick-up method based on sharpening filtering

Abstract

A method for picking up 3-D model feature line based on sharpening filter includes reading in 3-D model data and setting up storage structure of top point and adjacent top point of each top point on said model, carrying out sharpening pretreatment on said model and recalculating new coordinate of each top point, plotting outline of said model and calculating vertical point of sight direction and normal direction on said model and using it as outline point, connecting them and plotting them on screen, plotting kink mark and boundary line on said model.

Description

technical field [0001] The invention belongs to the field of computer graphics and imaging, and mainly relates to a model-based non-realistic rendering technology, in particular to a three-dimensional model feature line extraction method based on a sharpening filter. Background technique [0002] In the model-based non-photorealistic image rendering technology, extracting model feature lines is a very important step, which is the basis of many subsequent processing and rendering. There are two main methods for extracting feature lines of 3D models. [0003] The first is to calculate the model using the contour definition and draw the contour lines as the feature lines of the model. The first method is disclosed in the document "Illustrating smooth surfaces" (Hertzmann, A and Zorin, D. Proceeding of ACMSIGGRAPH 00, 517-526, 2000). The method is to draw the direction vector from the viewpoint to the point for each point on the surface of the three-dimensional model, that is,...

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Problems solved by technology

However, when this method smoothes the model, it will produce a blurred effect on the characteristic parts of the model (such as the eyes and nose of the cow model), which is not conducive to the extraction of feature lines.

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