  In this paper a blind, Secure, imperceptible and robust watermarking
algorithm based on wavelet transform domain is proposed in which for more
security, the watermark W is converted to a sequence and then a random binary
sequence R of size n is adopted to encrypt the watermark, where n is the size
of the watermark image. Afterwards, the encrypted watermark sequence W1 is
generated by executing exclusive-OR operation on W and R. This generated
watermark embeds into low frequency selected coefficients of Y channel wavelet
decomposition of JPEG-YCbCr using LSB insertion technique. The experimental
results show that the proposed algorithm increases the security and
imperceptibility of watermark and has better robustness against wavelet
compression and cropping attacks compared to the earlier work in [1].
