Effective Digital Image Watermarking in YCbCr Color Space Accompanied by Presenting a Novel Technique Using DWT
This is an incremental improvement for ownership verification and image authentication applications.
The paper tackles digital image watermarking by implementing a quantization-based algorithm in YCbCr color space using DWT, which inserts watermark bits into high-magnitude wavelet coefficients in the Y channel for blind retrieval. Experimental results show it provides extra imperceptibility and robustness against signal processing attacks compared to RGB color space.
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.