Abstract
This study presented an algorithm to protect the copyright watermark by providing Hamming codes as error correcting technique. Watermark was embedded in frequency domain using discrete cosine transformation and discrete wavelet transformation, to enhance the susceptibility. Combinations of two techniques are used to target medium frequencies only. Randomness of the watermark is also created before embedding. Instead of embedding in the same place in every block, it is embedded adaptively which depends upon the row and column of that particular block. Results prove the effectiveness of the algorithm against various attacks like jpeg attack, filtering and addition of noises like Gaussian noise, salt and pepper noise and speckle noise. ECC proved to be effective to recover the watermark after certain attacks performed.
Highlights
The tremendous growth of internet resulted penetrating in the remote areas
There are many solutions for this problem as far images are concerned like Steganography, cryptography and digital watermarking
Frequency domain watermarking is more robust than the spatial domain watermarking
Summary
The tremendous growth of internet resulted penetrating in the remote areas. It is even present where the person find hard to reach. Audio files or video files and they are getting it free of cost on the internet. The watermark can be embedded in spatial or frequency domain. Frequency domain watermarking is more robust than the spatial domain watermarking. DCT and DWT are used to convert an image into frequency domain. Watermark can be embedded by using combined DCT and DWT transformations. We have implemented our watermarking algorithm using combined DCT and DWT. The embedding pixel coordinates are variable depending upon the block handled at that time. Watermarks should be rapidly embedded into the host signals without much delay
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