A Robust Wavelet Based Watermarking System for Color Video

Abstract

In this paper, we propose a wavelet based watermarking system. The system use wavelet transform for red, green and blues channel independently. We use space-time coding for encoding the watermark message before data embedding. The bit-error-rate of recovered message is calculated. The embedding factor is selected in such a way that the host video maintains the same peak signal to noise ration with/without using space-time coding. The developed system is further examined, when host video faces compression and noise addition. Result shows the effectiveness of proposed watermarking system, especially when space-time coding is used.äº†å¯é çš„åŸºæ–¼å°æ³¢è®Šæ›çš„æ•¸å­—æ°´å°ç³»çµ±çš„å½©è‰²è¦–é »æ‘˜è¦åœ¨æœ¬æ–‡ä¸­ï¼Œæˆ‘å€‘æå‡ºäº†ä¸€ç¨®åŸºæ–¼å°æ³¢è®Šæ›æ°´å°ç³»çµ±ã€‚è©²ç³»çµ±ä½¿ç”¨å°æ³¢ç¨ç«‹åœ°è®Šæ›ç‚ºç´ ï¼Œç¶ å’Œè—è‰²é€šé“ã€‚æˆ‘å€‘ä½¿ç”¨ç©ºæ™‚ç·¨ç¢¼æ•¸æ“šåµŒå ¥ä¹‹å‰ç·¨ç¢¼è©²æ°´å°ä¿¡æ¯ã€‚æ¢å¾©çš„æ¶ˆæ¯çš„èª¤ç¢¼çŽ‡è¢«è¨ˆç®—ã€‚åµŒå ¥å› å­ä»¥é€™æ¨£çš„æ–¹å¼ï¼Œåœ¨ä¸»æ©Ÿè¦–é »ä¿æŒç›¸åŒçš„å³°å€¼ä¿¡è™Ÿèˆ‡/å™ªè²æ¯”è€Œä¸ä½¿ç”¨ç©ºæ™‚ç·¨ç¢¼é¸æ“‡ã€‚æ‰€é–‹ç™¼çš„ç³»çµ±çš„é€²ä¸€æ­¥ç ”ç©¶ï¼Œç•¶ä¸»è¦–é »å£“ç¸®é¢è‡¨å’Œå™ªè²åŠ æ³•ã€‚çµæžœè¡¨æ˜Žæå‡ºæ°´å°ç³»çµ±çš„æœ‰æ•ˆæ€§ï¼Œç‰¹åˆ¥æ˜¯ç•¶ä½¿ç”¨ç©ºæ™‚ç·¨ç¢¼ã€‚

Keywords

• Lyapunov Stability