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Blinn-Phong illumination enhancement algorithm based on gradient adaptation

An enhanced algorithm and self-adaptive technology, applied in computing, 3D image processing, image data processing, etc., can solve problems such as low brightness contrast and unprotrusive borders, and achieve the effect of enhanced contrast and real rendering effect

Inactive Publication Date: 2019-03-19
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0006] Aiming at the problem that the rendering effect under the Blinn-Phong lighting model is low in brightness contrast and the boundary is not prominent in volume rendering, a gradient-adaptive Blinn-Phong lighting enhancement algorithm is proposed.

Method used

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  • Blinn-Phong illumination enhancement algorithm based on gradient adaptation
  • Blinn-Phong illumination enhancement algorithm based on gradient adaptation
  • Blinn-Phong illumination enhancement algorithm based on gradient adaptation

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Embodiment Construction

[0043] The invention proposes a gradient-adaptive Blinn-Phong illumination enhancement algorithm. The first step is to use the central difference method to calculate the gradient modulus of the voxel gray value. In the second step, the gradient modulus is linearly mapped to the specular index, and the ambient light, diffuse reflection light, specular reflection light and comprehensive light intensity are calculated according to the Blinn-Phong lighting model. The third step is to linearly map the gradient modulus to the opacity coefficient, and multiply the comprehensive light intensity obtained in the previous step by the opacity coefficient to obtain the final color. The present invention uses the gradient modulus to distinguish the characteristics of the boundary and the interior of the material. On the basis of the Blinn-Phong illumination model, the voxels with different gradients are adaptively endowed with different highlight effects and opacity, which enhances the cont...

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Abstract

The invention is directed to classical Binn-in direct volume rendering. The invention discloses a Phong illumination model, and provides a Blinn-based on a voxel gray value gradient. The invention discloses a Phong illumination enhancement algorithm. The method comprises the following steps of: firstly, calculating a gradient and a gradient module value of a gray value of each integrated element by using a central difference method, linearly mapping the gradient module value to a mirror surface index of the point, and then according to Binn-, calculating the gradient and the gradient module value according to a Binn-; the Phong illumination model calculates ambient light intensity, diffuse reflection light intensity, specular reflection light intensity and cumulative light intensity, thenlinearly maps the gradient modulus value of each pixel gray value to the opacity coefficient of the point, and finally gives the opacity coefficient to the cumulative light intensity to obtain the final color.

Description

technical field [0001] The invention relates to the field of direct volume rendering, in particular to an illumination enhancement algorithm for direct volume rendering. Background technique [0002] Direct volume rendering is an important method of volume data visualization. It first needs to classify the volume data, and then assign different optical features such as different colors and opacity values ​​to different types of volume data according to the transfer function, and then according to the viewpoint and volume in space. The relative position of the data determines the final imaging effect. The direct volume rendering algorithm does not need to preprocess and segment the volume data field, as long as the corresponding transfer function is designed, the visualization of specific tissues or regions of interest can be realized. This technology has been widely used in geological and oil exploration, earthquake, medicine, weather forecasting and other fields. [0003]...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/83
CPCG06T15/83
Inventor 高颖李启凡郭淑霞闫彬舟王子道汪静邵群
Owner NORTHWESTERN POLYTECHNICAL UNIV
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