Ray-casting algorithm is that ray passes volume cell of data field, sampling relative pels color to form video image.

光线投影算法将光线穿过数据场中的体元，采样得到相关象素的颜色， 形成可视图。

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We propose a colormap reproduce algorithm for high dynamic range volume data, which can adjust pre-set color map according to the characteristics of volume data.

提出一种高动态范围体数据颜色映射表再生成方法，针对体数据的数值分布特征调整预设定的颜色映射表。

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These forecasting models in the paper are tested with the data on sales volume and market share of XIAHUA color TV in three years lately.

最后本文以厦华彩电近三年的销售数据为研究样本，对文中涉及的模型进行了实证分析。

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