1 research outputs found
A DCT And SVD based Watermarking Technique To Identify Tag
With the rapid development of the multimedia,the secure of the multimedia is
get more concerned. as far as we know , Digital watermarking is an effective
way to protect copyright. The watermark must be generally hidden does not
affect the quality of the original image. In this paper,a novel way based on
discrete cosine transform(DCT) and singular value decomposition(SVD) .In the
proposed way,we decomposition the image into 8*8 blocks, next we use the DCT to
get the transformed block,then we choose the diagonal to embed the information,
after we do this, we recover the image and then we decomposition the image to
8*8 blocks,we use the SVD way to get the diagonal matrix and embed the
information in the matrix. next we extract the information use both inverse of
DCT and SVD, as we all know,after we embed the information seconded time , the
information we first information we embed must be changed, we choose a measure
way called Peak Signal to Noise Ratio(PSNR) to estimate the similarity of the
two image, and set a threshold to ensure whether the information is same or
not