直方图作为对图像颜色或灰度分布的一种基本描述量，文中利用其统计特征进行直方图之间的相似性度量。
Histogram, as a basic description of the image or the gray distribution, using of statistical characteristics of it, are compared in similarity.
然后引入色彩相似性约束将灰度空间的匹配和彩色空间的匹配有机的结合起来，大大提高了匹配的精度。
Then, by adding constraint of color similarity, the grey space matching was combined with color space matching suitably and the improved SSD method could use the color information reasonably.
结果表明，通过计算灰度场的相似离度，可以有效地定量描述台风非对称性结构的相似性，并能较准确地预测其未来的移动路径。
The result indicated that it can describe effectively the comparability of typhoon asymmetry structure by harmonic analysis method, and also can predict exactly prospective motion.
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