To achieve the image watermark embedding and extraction, and made some attack tests

Filename	Size	Update
DCT\100.bmp	263222	2017-07-09
DCT\1000.bmp	263222	2017-07-09
DCT\20000.bmp	263222	2017-07-09
DCT\5000.bmp	263222	2017-07-09
DCT\50000.bmp	263222	2017-07-09
DCT\DCT_block.m	528	2017-05-02
DCT\Lena.bmp	263222	2017-07-09
DCT\testDCT.m	382	2017-05-02
DCT\Untitled.m	402	2017-07-08
DCT\Untitled2.m	703	2017-07-09
DCT

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