  In this paper, a quantization based watermark casting and blind watermark
retrieval algorithm operating in YCbCr color space using discrete wavelet
transform (DWT), for ownership verification and image authentication
applications is implemented. This method uses implicit visual masking by
inserting watermark bits into only the wavelet coefficients of high magnitude,
in Y channel of YCbCr color space. A blind watermark retrieval technique that
can detect the embedded watermark without the help from the original
uncorrupted image is devised which is computationally efficient. The new
watermarking algorithm combines and adapts various aspects from existing
watermarking methods. Experimental results show that the proposed technique to
embed watermark provides extra imperceptibility and robustness against various
signal processing attacks in comparison with the same technique in RGB color
space.
