Digital image watermark

1.SSIM: structural similarity links
2.dwt: discrete wavelet transform link
3.sum:

  1. sum(a,'all'): Find the sum of all elements of a matrix,

  2. sum(a): Summing along rows or columns that are not 1, or summing a column as a unit.

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Origin blog.csdn.net/qq_40797015/article/details/105669088