Experimental results show that this method can get higher recognition rate, with the property of translation and scaling invariance.

实验结果表明，该方法在复杂场景下可以获得较高的识别率，具有平移和尺度不变性等特点。

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And the image feature descriptor has a rotation, translation, scaling invariance, etc. it can be a very good to describe the shape and spatial distribution of information.

且获得的图像特征描述符具有旋转、平移、尺度不变性等优点，能够很好地描述图像的形状和空间分布信息。

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The use of hidden Markov models (HMM) for faces is motivated by their partial invariance to variations in scaling and by the structure of faces.

隐马尔可夫模型(HMM)在人脸识别中的运用是由HMM在图像定标变化过程中的局部恒定性和人脸的结构所决定的。

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