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Imperceptible Watermarking Algorithm Using Block LSB Scheme for Color Images


Posted by: computer science technology
Created at: Friday 22nd of January 2010 02:45:51 PM
Last Edited Or Replied at :Friday 22nd of January 2010 02:45:51 PM
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k remains intact, quality is improved and security issues are performed using a secret key. For the extraction of watermark image blind extraction method is used. This is the new watermarking approach where the host image and watermark image both are the color images.

Submitted by
V.Vijaya Raghavan1, M.Laavanya1 and Dr.K.Bommanna Raja2 1 Odaiyappa College of Engineering and Technology, Theni, Tamilnadu, India. 2 Principal, Excel College of Engineering for Women, Komarapalayam, Namakkal.
Keywords “ Imperceptible Watermarking, Spatial Domain, Insertion-Extraction Techniques, HVS..................[:=> Show Contents <=:]



Smart Cameras in Embedded Systems


Posted by: computer science crazy
Created at: Tuesday 07th of April 2009 12:57:16 PM
Last Edited Or Replied at :Monday 13th of February 2012 02:06:16 AM
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ety of applications including human and animal detection, surveillance, motion analysis, and facial identification.

Video processing has an insatiable demand for real-time performance. Fortunately, Moore's law provides an increasing pool of available computing power to apply to real-time analysis. Smart cameras leverage very large-scale integration (VLSI) to provide such analysis in a low-cost, low-power system with substantial memory. Moving well beyond pixel processing and compression, these systems run a wide range of algorithms to extract meaning from streaming video.

Because they ..................[:=> Show Contents <=:]



Wideband Sigma Delta PLL Modulator


Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:38:33 AM
Last Edited Or Replied at :Monday 27th of July 2009 01:42:14 AM
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e modulator is higher than Mash modulator. In this feed back feed forward modulator the loop band width was limited to nearly three orders of magnitudes less than the reference frequency. So if it is to be used as a closed loop modulator power dissipation will increase.

So in order to widen the loop band width the close-in-phase noise must be kept within tolerable levels and also the rise of the quantization noise must be limited to meet high frequency offset phase noise requirements. At low frequencies or dc the modulator transfer function has a zero which will results in addition of phase..................[:=> Show Contents <=:]



Free Space Optics


Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:10:42 AM
Last Edited Or Replied at :Sunday 01st of March 2009 02:10:42 AM
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applications. At the end of 80's, it appeared as a commercial option but technological restrictions prevented it from success. Low reach transmission, low capacity, severe alignment problems as well as vulnerability to weather interferences were the major drawbacks at that time. The optical communication without wire, however, evolved! Today, FSO systems guarantee 2.5 Gb/s taxes with carrier class availability. Metropolitan, access and LAN networks are reaping the benefits.

The use of free space optics is particularly interesting when we perceive that the majority of customers does not poss..................[:=> Show Contents <=:]



Lightning Protection Using LFA-M


Posted by: computer science crazy
Created at: Sunday 15th of February 2009 12:36:04 AM
Last Edited Or Replied at :Thursday 01st of March 2012 11:49:33 PM
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icient to protect an over head line against induced over voltages. An LFA should be arranged in parallel with each insulator in order to protect a line against direct lightning strokes.....................[:=> Show Contents <=:]



WIDEBAND OFDM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:13:47 PM
Last Edited Or Replied at :Thursday 01st of April 2010 04:15:58 AM
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-speed communication such as multipath fading and RF noise interference. It can be considered as multiple access technique OFDMA....................[:=> Show Contents <=:]



Direct to home television DTH


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:26:57 AM
Last Edited Or Replied at :Monday 01st of August 2011 11:18:36 PM
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ates, Europe and South East Asia. Direct to home television is a wireless system for delivering television programming directly to a viewer's house. Usually broadcasting stations use a powerful antenna to transmit radio waves to the surrounding area. Viewer's can pickup the signal with a much smaller antenna. The main limitation of broadcast television is range. The radio signal used to broadcast television shoot out from the broadcast antenna in a straight line. Inorder to receive these signals, you have to be in the direct line of sight of the antenna. Small obstacles like trees or small b..................[:=> Show Contents <=:]



Lightning Protection Using LFA-M


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:39:22 PM
Last Edited Or Replied at :Sunday 17th of October 2010 11:56:38 PM
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ign on the tall object. When the potential between the cloud and line exceed the breakdown value of air, the lightning discharge occurs between the cloud and the line.

In stroke B the lightning discharge occurs on the overhead line as the result of stroke A between the clouds. There are three clouds P,Q and R having positive, negative and positive charge respectively. Charge on the cloud Q is bound by cloud R.If the cloud P shift too nearer to cloud Q,Then lightning discharge will occur between them and charges on both these cloud disappear quickly. The result is that charge on cloud R sudd..................[:=> Show Contents <=:]



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