In this method, the original image 's feature is extracted by using wavelet transform and quantization. The feature information is changed into watermark by the chaotic sequence encryption.
该方法在一定的量化标准下利用小渡变换提取图象的特征信息，通过混沌序列对其加密生成数字水印。
In the research of phase information of rotary mechanism, comparatively phase is extracted from multiple frequency phase as diagnosing feature.
通过对旋转机械相位信息的研究，提出从倍频相位中提取相对时相作为诊断特征量。
Product assembly feature information is extracted automatically from CAD system.
从CAD系统中，对产品装配体进行自动产品装配特征识别；
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