matlab prepared on the gray image to add the digital watermark and extraction procedures. Compression package has sample images. Can add watermarks, the results of the changes are not easily distinguishable from the naked eye, does not affect use. Information can be added up to 10k bytes in length. Verifiable extraction has been modified, if modified, can extract hidden information. Can modify the location of tags. Occurred when the image rotation, zooming, a small amount of translation were able to extract strong watermark information, to ensure that the image source. Weak watermark high recognition rate, strong watermark is not very high recognition rate, when the image changes in small, can work, changes in large, strong watermark can not be extracted.

Packet : 27796718gray_fragile_robust.rar filelist
gray_fragile_robust\bdct.m
gray_fragile_robust\bdctmtx.m
gray_fragile_robust\CreateWater.m
gray_fragile_robust\dequantize.m
gray_fragile_robust\ibdct.m
gray_fragile_robust\im2vec.m
gray_fragile_robust\InfoMask.m
gray_fragile_robust\InsertWater.m
gray_fragile_robust\jpeg_qtable.m
gray_fragile_robust\jpeg_read.m
gray_fragile_robust\jpeg_write.m
gray_fragile_robust\quantize.m
gray_fragile_robust\readme.txt
gray_fragile_robust\temptest.m
gray_fragile_robust\vec2im.m
gray_fragile_robust\VerifyWater.m
gray_fragile_robust\WaterTest.m
gray_fragile_robust

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