The need for displaying one"s own multimedia content on the internet is increasing day by day. With the exponential growth of internet and high speed networks operating through out the world it"s a challenging task to protect copyright of an individual"s creation. Digital watermarking provides a viable solution to protect copyright and authenticate the ownership of an intellectual property. In this paper we propose a new DCT based additive watermarking scheme which provides higher resistance to image processing attacks mainly JPEG compression. In our approach the watermark is embedded in the mid frequency band of the DCT blocks only in the sub band which is carrying low frequency components and the high frequency sub band components remain untouched. General Terms KeywordsAveraged DCT blocks, pixel intensity, INTRODUCTIONThe recent development of network multimedia systems & explosion of fast communication network has discouraged & damped the multimedia content providers i.e. authors, publishers to grant the distribution of their document on the network environment. The intellectual property authentication has become an issue of concern[1] While a considerable efforts and a lot of economic resources are used for the creation of intellectual property particularly in industrial societies, the cost of reproducing such intellectual creations typically constitute only a small portion of the creation. However a creator always desires some rewards or incentives for his creation which he is not able to get due to low cost copying. More and more researchers are attracted to the area of image watermarking because of the property of the image as it has a lot of redundant information contained in it which can be exploited to be used for watermark insertion. Cox et. al uses DCT domain for watermark embed for the first time .As JPEG standard also uses DCT for image compression it is always a good idea to explore image watermarking and robustness of watermark in DCT domain. The paper is divided into following sections .Section 2 gives the description of the common DCT based watermark insertion technique which works as the base of our proposed algorithm section 3 gives the description of the proposed scheme Section 4 describes the results and the discussion on the results followed by the conclusion in Section 5. DCT DOMAIN WATERMARKINGDiscrete-Cosine-Transform or DCT is a popular transform domain watermarking technique. The DCT allows an image to be broken up into different frequency bands namely the high ,middle and low frequency bands thus making it easier to to choose the band in which the watermark is to be inserted. The literature survey reveals that mostly the middle frequency bands are chosen because embedding the watermark in a middle frequency band do not scatter the watermark information to most visual important parts of the image i.e. the low frequencies and also it do not overexpose them to removal through compression and noise attacks where high frequency components are targeted.[17]. Numerous watermarking...

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Energy Consumption has become a critical issue for all kinds of computer systems, data centers and servers. Their demand for 24X7 connectivity and availability needs huge power in quantity of megawatts. The performance of microprocessors has been improving at an exponential rate and this trend is continuing from past two decades. However, increased performance does not come for free. One of the most important consequences of higher performance has been a dramatic increase in power consumption. For example, Intel 386 processor initially consumed about 2 Watts of energy; a Pentium 4 can use as much as 55 Watts. Various algorithms have been developed with respect to present needs and situations, but no one thinks of the future. This paper discusses the novel approach to reduce the power consumption of the operating system and gives an entirely new dimension to look in. We have given the name "green" to that operating system, as its more energy efficient. Our paper will also explore the future power issues of the operating system and the holistic approach to tackle them, in the form of an entirely new operating system viz. Green OS.