Microsoft Word - Tpel.doc Mathematical Problems of Computer Science 33, 150—161, 2010. 150 Effective Digital Image Watermarking in YCbCr Color Space Accompanied by Presenting a Novel Technique Using DWT Mehdi Khalili 1 and David Asatryan 2 Institute for Informatics and Automation Problems of NAS of RA e-mail: Khalili@ipia.sci.am 1 , dasat@ipia.sci.am 2 Abstract In this paper, a quantization based watermark casting and blind watermark retrieval algorithm operating in YCbCr color space using discrete wavelet transform (DWT), for ownership verification and image authentication applications is implemented. This method uses implicit visual masking by inserting watermark bits into only the wavelet coefficients of high magnitude, in Y channel of YCbCr color space. A blind watermark retrieval technique that can detect the embedded watermark without the help from the original uncorrupted image is devised which is computationally efficient. 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Chane, “Robust techniques for hiding data in images and video”, Ph-D Thesis, Santa Barbara, University of California, 2000. 152 Effective Digital Image Watermarking in YCbCr Color Space ¶áõݳíáñ å³ïÏ»ñÇ` YCbCr ï³ñ³ÍáõÃÛ³Ý Ù»ç DWT ÏÇñ³éٳٵ Ãí³ÛÇÝ çñ³ÝßÙ³Ý Ýáñ ³ñ¹Ûáõݳí»ï Ù»Ãá¹ Ø. ʳÉÇÉÇ ¨ ¸. ²ë³ïñÛ³Ý ²Ù÷á÷áõÙ Ðá¹í³ÍáõÙ ³é³ç³ñÏí»É ¿ ã³ñïáÝí³Í û·ï³·áñÍáõÙÇó Ãí³Ûݳóí³Í å³ïÏ»ñÇ å³ßïå³ÝáõÃÛ³Ý ³É·áñÇÃÙ` »ñÏã³÷³ÝÇ Áݹѳï í»ÛíÉ»ï-Ó¨³÷áËáõÃÛáõÝÝ»ñÇ (DWT) ÏÇñ³éٳٵ: ²É·áñÇÃÙÁ Ùß³Ïí»É ¿ ·áõݳíáñ å³ïÏ»ñÇ YCbCr ï³ñ³ÍáõÃÛ³Ý Ñ³Ù³ñ, Áݹ áñáõÙ çñ³ÝÇßÇ µÇïÁ Ý»ñ¹ñíáõÙ ¿ ³Û¹ ï³ñ³ÍáõÃÛ³Ý Y µ³Õ³¹ñÇãÇ ³é³í»É Ù»Í Ù³·ÝÇïáõ¹áí í»ÛíÉ»ï-·áñͳÏÇóÝ»ñÇ Ù»ç: òáõÛó ¿ ïñí»É, áñ ³é³ç³ñÏí³Í Ù»Ãá¹Á ³å³ÑáíáõÙ ¿ çñ³ÝÇßÇ ³í»ÉÇ µ³ñÓñ ³Ýï»ë³Ý»ÉÇáõÃÛáõÝ ¨ ϳÛáõÝáõÃÛáõÝ ï³ñµ»ñ ï»ë³ÏÇ Ñ³ñÓ³ÏáõÙÝ»ñÇ Ýϳïٳٵ, ù³Ý ·áõݳíáñ å³ïÏ»ñÇ RGB ï³ñ³ÍáõÃÛ³Ý Ù»ç ·áñÍáÕ ÝáõÛݳïÇå ³É·áñÇÃÙÝ»ñÁ: