Abstract:

A novel wavelet watermark algorithm based on erbium\|doped fiber laser with an optical delay feedback (ODF-EDFL) system to encrypt  watermark image for color image was proposed. The erbium\|doped fiber laser (EDFL) was chaos with coefficients varying in a very wide range when  the optical time\|delayed system was added on it. The chaotic sequences generated by an ODF\|EDFL system were improved to encrypt the binary watermark image. Then  the modulated watermark was embedded in the high region of the  low frequency band of  the green component which had been DWT of the original image. Experimental results show that the proposed method can realize the watermark embedding and extracting on color image and is robust against the attacks of general image processing methods such as JPEG compression, noise, and filtering.

Key words: digital watermark, ODF\, EDFL chaos system, color image, green component, discrete wavelet transform (DWT)