Image-based Complicated 3D Model Rendering Method

Abstract

The invention provides a complicated three-dimensional model drawing method based on images. Vertexes are uniformity selected from a spherical surface surrounding a model as camera coordinate positions, and a color image and a depth image of the model under a sampling visual angle are obtained by taking a sphere center as a target point of a camera. The method comprises the steps of triangularly dividing the spherical surface according to sampling point coordinates to determine a triangle where a virtual visual angle is located, taking corresponding visual angles as reference visual angles when taking vertexes of the triangle as sampling points, and drawing the model under the virtual visual angle with depth images and color images under the reference visual angles: calculating mapping relationships between the virtual visual angle and pixels in the three reference visual angles respectively with parameters of the reference visual angles, and drawing an image of the virtual visual angle with the appropriate pixels of the reference visual angles or a background pixel by taking the depth images as references, and finally, optimizing the drawn color image. The method can meet real-time requirements and obtains a very true-to-life drawing effect.

Description

technical field [0001] The invention relates to an image-based realistic rendering method, which is mainly used for realistic rendering of complex models under a virtual viewing angle. Background technique [0002] The general process of realistic rendering in traditional graphics is: the user inputs the geometric characteristics of the object and performs geometric modeling, and then according to the lighting information of the environment where the model is located, the physical properties of the model such as smoothness, transparency, reflectivity and refractive index, and Surface texture, etc., through space transformation, perspective transformation, etc., calculate the color value of each pixel of the object under a specific viewing angle. However, the modeling process of this method is complex, the overhead of calculation and display is high, the coupling between time complexity and model complexity is high, it is not suitable for the rendering of complex models, and ...

AI Technical Summary

Problems solved by technology

[0019] Existing realistic rendering methods for 3D models have the following disadvantages: geometry-based methods have complex model acquisition and reconstruction processes, the rendering process is greatly affected by model complexity and model lighting attributes, and the rendering effect is not realistic, so it is not suitable for complex models In the image-based rendering method, the composite viewing angle is limited to the baseline between two reference viewing angles, and it is impossible to generate an image of the object at any viewing angle

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