The eigen skin-color method is for the color images. For gray images, this paper USES face recognition method based on hidden Markov models to detect human faces.

特征肤色的方法是针对彩色图像的人脸检测方法，针对灰度图像本文采用基于隐马尔可夫模型的人脸识别方法来检测人脸。

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Markov Chain is suitable for short-term forecast of great capacity sample data sequence, but gray system forecast method is suitable for medium-term forecast of few capacity sample data sequence.

马尔柯夫链适用于大样本数据序列的短期预测，而灰色系统预测方法适用于小样本数据的中期预测。

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In the stock price predicting, the Gray Markov predict Method USES the foundational theory, gives revision and expects to offer some guidance for investors' investment decision.

灰色马尔可夫预测方法在股票价格预测中应用理论基础，运用修正方法，能为投资者的投资决策行为提供一定的指导。

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