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鲁大营, 朱登明, 王兆其, 高仲合, 倪建成. 增强纹理平流算法研究[J]. 计算机辅助设计与图形学学报, 2017, 29(4): 670-679.
引用本文: 鲁大营, 朱登明, 王兆其, 高仲合, 倪建成. 增强纹理平流算法研究[J]. 计算机辅助设计与图形学学报, 2017, 29(4): 670-679.
Lu Daying, Zhu Dengming, Wang Zhaoqi, Gao Zhonghe, Ni Jiancheng. Enhanced Texture Advection Algorithm[J]. Journal of Computer-Aided Design & Computer Graphics, 2017, 29(4): 670-679.
Citation: Lu Daying, Zhu Dengming, Wang Zhaoqi, Gao Zhonghe, Ni Jiancheng. Enhanced Texture Advection Algorithm[J]. Journal of Computer-Aided Design & Computer Graphics, 2017, 29(4): 670-679.

增强纹理平流算法研究

Enhanced Texture Advection Algorithm

  • 摘要: 当以纹理方式可视化三维矢量场时,纹理卷积会降低矢量纹理脉的对比度,容易出现平流纹理细节模糊与粗糙的问题,为此提出一种增强纹理平流算法.首先通过自定义球体半径确定任一噪声点的邻近点,利用当前噪声点与邻近点间的位置关系计算噪声伪梯度,以测试矢量场局部区域内的变化趋势,选取伪梯度的最大下降幅度参与纹理平流;然后根据任一平流位置处的噪声值对最终输出纹理的贡献度自适应调整噪声权重;最后引入盒型滤波递归合成平滑算子进行纹理卷积来生成矢量体纹理.算法的有效性根据可视化对比度的量化分析函数进行客观评价.实验结果表明,该算法能够有效地增加纹理平流踪迹间强度对比,改善绘制效果,高质量地显示三维矢量场的纹理分布.

     

    Abstract: While texture-based methods are used to visualize 3D vector fields, one major issue is the perception of the resulting images that might suffer from problems of low contrast and rough-textured flow pattern. In order to enhance the 3D vector field visualization, this paper presents a high-quality texture advection algorithm. Pseudo-gradients are calculated with the position relation between the current noise point and its next neighbors, and the maximum descending degree is selected to participate in the texture advection. The weight of the noise texture is adjusted adaptively according to the contribution from every advection position. Higher-order filter kernel is obtained by recursively convolving box-type filters. The output texture is produced by convolving texels along the calculated particle tracing trajectory. The validity of the proposed algorithm is examined with the objective quantization function on visual contrast. Experiment results demonstrate that this algorithm can effectively increase the contrast between the advection trajectories, improve the rendering effect, and achieve high-quality visualization.

     

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