As copyright protection is vital and indispensable, watermarking schemes are employed for securing digital data. We propose a novel (to the best of our knowledge) blind and invisible, semi-fragile image watermarking scheme for embedding coloured watermark inside a coloured cover image. The spatial domain embedding is implemented in such a way that modification made in the pixel values of the cover image is not noticeable by human perception. However, the watermark pixel values can be recovered using a unique decoding mechanism, which has been included in the paper. Extraction of the original cover image using the embedded image is also discussed. The obtained MATLAB implementation results are promising when compared to similar state-of-the-art research work.
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