Strengthen mark image by downsampling some adjacent pixels
Keywords:
logo, Adjacent pixel, similarity, PSNR, NCAbstract
Multimedia is a mode of communication that blends various types of content, including image, audio, text, animations, and video, and the digital watermark is one of these kinds of marker to protect this multimedia. This Mark is intercepted by many of threats that are intended to be removed, destroy, or detected. To determine the success or failure of this process, there are certain criteria are used to make this decision. In this research, some features of the logo image were taken advantage of to achieve the best values for those criteria that determine the quality and success of the watermarking process. The method used is to insert some of the watermark and leave others, and rely on similar values for adjacent pixels while keeping a secret key to arrange the pixels after deleting part of the mark image, and using this key between sending and receiving . Paper foxed on the adjacent pixels have same zero value property contribute to reduce number of pixels of mark image that will be injected after splitting the logo to blocks. By separate the mark into blocks and the segments whose adjacent bit values are different will be injected into the cover image it facilitates the injection process. Reducing the number of bits injected means reducing the time needed for injection bits into the cover image and reducing the number of bits that are vulnerable to attack, Consequently the values of these criteria) quality-security- Capacity and Robustness) improved according to the results obtained.
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