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A SECURE AND ROBUST CDMA DIGITAL IMAGE WATERMARKING ALGORITHM BASED ON DWT2, YIQ COLOR SPACE AND ARNOLD TRANSFORM

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Author(s): Mehdi Khalil

Journal: Signal & Image Processing
ISSN 2229-3922

Volume: 2;
Issue: 2;
Start page: 131;
Date: 2011;
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Keywords: CDMA watermarking | DWT2 | YIQ color space | Arnold cat map | Pseudo-random number generator

ABSTRACT
In this paper, a secure and robust cryptographic CDMA watermark algorithm based on DWT2, YIQ color space and Arnold transform is proposed. In the approach, for more security of watermark, the binary watermark image W, after scrambling with Arnold cat map is converted to a sequence and then, to determine the pixel to be used on a given key, a random binary sequence R of size n is adopted to encrypt the watermark using a pseudo-random number generator; where n is the size of the watermark. After that, it is embedded into the selected subbands coefficients of wavelet decomposition of Y channel of YIQ color space. For completely controlling the imperceptibility of watermarked images and the robustness of watermarks an adaptive casting technique is utilized using a gain factor k. The experimental results show that the proposed approach provides extra security and robustness against JPEG compression and different noise attacks compared to the similar proposed methods in earlier. Moreover, to extract watermarks in the proposed scheme, there is no need to original image.
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