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In the development of cluster-based energy-efficiency protocols for Wireless Sensor Networks (WSNs), a particularly challenging problem is how to dynamically organize the sensors into a wireless communication network and route sensed information from the field sensors to a remote base station in a matter that prolongs the lifetime of WSNs. This paper presents a new energy-efficient dynamic clustering...
Invisible watermarking methods have been applied in frequency domains, trying to embed a small image inside a large original image. The original bitmap image will be converted into frequency domain to obtain the discrete cosine transform (DCT) matrices from its blocks. The bits of the logo image are embedded in random color components of the original image, as well as in random positions in each selected...
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