在运行时，光能传输计算必须的光线与场景的求交运算被简化为在交点场中的查询操作。
At runtime, the i-field can be queried to accelerate the line-scene intersection computation that required in light energy propagation.
传统的基于颜色直方图特征的图象检索方法简单且易于实现，但其直方图求交运算量过大，而且丢失了颜色的空间分布信息。
It is easy to perform for traditional image retrieval based on color histogram, however, its calculation in color histogram intersection is too large and the space distribution information is lost.
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