基于小波变换的数字水印算法matlab代码，结合PCA的尺度不变特征变换(SIFT)算法，有详细的注释。- Based on wavelet transform digital watermarking algorithm matlab code, Combined with PCA scale invariant feature transform (SIFT) algorithm, There are detailed notes.

可以提取一幅图中想要的目标，这是第二能量熵的matlab代码，结合PCA的尺度不变特征变换(SIFT)算法。- Target can be extracted in a picture you want, This is the second energy entropy matlab code, Combined with PCA scale invariant feature transform (SIFT) algorithm.

用于建立主成分分析模型，这是第二能量熵的matlab代码，结合PCA的尺度不变特征变换(SIFT)算法。- Principal component analysis model for establishing, This is the second energy entropy matlab code, Combined with PCA scale invariant feature transform (SIFT) algorithm.

结合PCA的尺度不变特征变换(SIFT)算法，包括压缩比、运行时间和计算复原图像的峰值信噪比,这是第二能量熵的matlab代码。- Combined with PCA scale invariant feature transform (SIFT) algorithm, Including compression ratio, image restoration computing uptime and peak signal to noise ratio, This is the second