In this paper, a novel watermarking algorithm for colour image resistant to copy attack is presented. The method proposed is experimented in YUV colour space. The feature describing the original image uniquely is attained from the chroma component of the original colour image. After being scrambled by chaotic sequences, the feature is embedded into the luminance components of the host colour image and the watermark can be extracted blindly. We can detect copy attack by comparing the watermark extracted and the new feature of the watermarked image. The simulations show that the scheme is effectively robust against not only common image processing such as noise, JPEG compression, filtering, cropping, etc, but also copy attack.
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