In this paper, a saliency and phase congruency based digital image watermarking scheme has been projected. The planned technique implants data at least significant bits (LSBs) by means of adaptive replacement. Here more information is embedded into less perceptive areas within the original image determined by a combination of spectral residual saliency map and phase congruency map. The position of pixels with less perceptibility denotes the most unimportant region for data hiding from the point of visibility within an image. Therefore any modification within these regions will be less perceptible to one observer. The model gives a concept of the areas which has excellent data hiding capacity within an image. Superiority of the algorithm is tested through imperceptibility, robustness, along with data hiding capacity.
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Digital domain provides various advantages like noise immunity, flexibility of implementation, easy data storage, low power consumption, scalability etc. over analog domain, as published by Pelgrom (2010). However all the natural signals are analog, digitizations is required for processing by means of sampling and quantization. Though due to quantization some information loss is occur in the form of quantization error but this error can be minimized by altering the number of quantization levels as per Freeman (2005). In addition to that signal processing are simpler and more reliable in digital domain with lower cost. As a result technology switches over to digital domain, according to Proakis (2007) and Salivahanan and Gnanapriya (2011). This technology swap creates a revolution in information technology and data transmission over digital channels or in World Wide Web as published by Wolinsky Art (1999). Over and above the immense advantages offered by the Digital domain creates a boom in digital systems by means of digital consumer devices, according to the publication of Dhir (2004)
The enormous popularity of internet along with digital consumer devices like digital cameras, scanners etc, has become an indispensable part of people’s live. At the same time as the popularity increases, access and storage of digital information become very easier. Accordingly a budding quantity of personal information about the users in addition to other digital data is stored in electronic form and that is generally transferred using unrestricted electronic means, as published by Feghhi Jalal et al. (1999). This effortless accessibility of digital information and the simplicity of the digital systems have left the contents over the digital media extremely insecure, in reference with Bidgoli Hossein (2006) and Furht Borko and Kirovski Darko (2006). This shows the way to the emerging problems like Copyright Protection as proposed by Farhadzadeh and Voloshynovskiy (2014), Nasir et al. (2007), Gertz Michael & Jajodia Sushil (2007) Wu Zhijun, (2014) and Zhang D et al (2009), Authenticity in print by Dal Park Geum et al. (2007), Eswaraiah R. & Reddy E.S., (2014), Otum Hazem Munawer Al (2014) & Wu Yongdong (2006), integrity verification and security of the digital information as proposed by Hosmer Chet, (2002), Li Chang-Tsun et al. (2010), Lynch C., (2000) & White paper, Digimarc Corporation (2004). As a result, the need for mechanisms to protect such information is undeniable.