A Hybrid DCT and DWT Color Image Watermarking in RGB Color Space
نویسندگان
چکیده
This paper presents a hybrid blind watermarking technique for color images based on DCT in wavelet transform. Advantages of two powerful transforms namely DCT and DWT are combined. Carrier image is first decomposed into 3 channels, namely R, G, B. Harr DWT is applied to Blue channel and HH band is selected for watermark insertion. HH band is divided into blocks of size 8×8. DCT is applied to each 8×8 sized block. Finally binary watermark bits are inserted into middle frequency coefficients by adjusting coefficients DCT(4,3) and DCT(5,2). Simulation results shows that the proposed technique is imperceptible as well as robust against wide variety of attacks like noise attacks and filtering attacks etc. It achieves PSNR as 66.26 dB and recovers watermark completely with NC value as 1. Results are compared with DCT watermarking algorithm, it is proved that hybrid watermarking results are better than implementing a single algorithm alone.
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