在这一节中就采用opencv自带的一个EM sample来学习下opencv中EM 算法类的使用，顺便也体验下EM 算法的实际应用。

　　环境：Ubuntu12.04+Qt4.8.2+QtCreator2.5+opencv2.4.2

　　在这里需要使用2个与EM算法有关的类，即CvEM和CvEMParams，这2个类在opencv2.4.2已经放入legacy文件夹中了，说明不久就会被淘汰掉，因为在未来的opencv版本中，将采用Algorithm这个公共类来统一接口。不过CvEM和CvEMParams的使用与其类似，且可以熟悉EM算法的使用流程。

　　需要注意的是这2个类虽然是与EM算法有关，可是只能解决GMM问题，比较局限。也许这是将其放在legacy中的原因吧。

可以参考本篇博客来学习：http://www.cnblogs.com/tornadomeet/archive/2012/07/16/2592953.html-In this section, the opencv comes with an EM sample to learn the use of the EM algorithm under opencv class, by the way, experience under the practical application of the EM algorithm. Environment: Ubuntu12.04+Qt4.8.2+QtCreator2.5+opencv2.4.2 here need to use two class EM algorithm, namely CvEM and CvEMParams two classes in opencv2.4.2 into the legacy file folder shows soon will be eliminated, because in future versions of opencv Algorithm this public class unified interface. However, use of CvEM and CvEMParams its similar, and familiar with the use of the EM algorithm process. Should be noted that the two classes and to the EM algorithm, but can only solve the GMM problem, more limited. Perhaps this is put the legacy of the reasons. You can reference this blog to learn: http://www.cnblogs.com/tornadomeet/archive/2012/07/16/2592953.html