matlab gray image of the preparation of the digital watermarking and extraction procedures to add. There are examples of compressed picture package. Watermark can be added, resulting in a change 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. Occurs when the image rotation, zooming, a small amount of translation, the strong can extract the watermark information, to ensure that the image source. Watermark to identify a high rate of weak, strong watermark is not very high recognition rate, when the image changes in small, you can work bigger changes, the strong can not extract the watermark.




File list:
gray_fragile_robust
..................\bdct.m
..................\bdctmtx.m
..................\CreateWater.m
..................\dequantize.m
..................\ibdct.m
..................\im2vec.m
..................\InfoMask.m
..................\InsertWater.m
..................\jpeg_qtable.m
..................\jpeg_read.m
..................\jpeg_write.m
..................\quantize.m
..................\readme.txt
..................\temptest.m
..................\vec2im.m
..................\VerifyWater.m