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what is photodna?

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PhotoDNA  is a technology developed by  Microsoft  and improved by  Hany Farid  of  Dartmouth College  that computes  hash  values of images, video and audio files to identify similar images. [1]  PhotoDNA is primarily used in the prevention of child pornography, and works by computing a unique hash that represents the image. This hash is computed such that it is resistant to alterations in the image, including resizing and minor color alterations. [1]  It works by converting the image to black and white, resizing it, breaking it into a grid, and looking at intensity gradients or edges. [2] It is used with Microsoft's own services  Bing  and  OneDrive , [3]  as well as by  Google Gmail ,  Twitter , [4]   Facebook , [5]   Adobe Systems [6]  and the  National Center for Missing & Exploited Children , [7]  to whom Microsoft donated the technology. Microsoft donated the ...
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A new type of transistor

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SOLUTION FOR NEXT GENERATION NANOCHIPS COMES OUT OF THIN AIR.    Instead of sending electrical currents through silicon, it sends electrons through narrow air gaps, where they can travel unimpeded as if in space. The device eliminates the use of a semiconductor, making it faster and less prone to heating up.  “Every computer and phone has millions to billions of electronic transistors made from  silicon, but this technology is reaching its physical limits where the silicon atoms get in the way  of the current flow, limiting speed and causing heat,” lead author Shruti Nirantar said.  “ Our air  channel transistor technology has the current flowing through air, so there are no collisions to  slow it down and no resistance in the material to produce heat .”  The design solved a flaw in traditional solid channel transistors – they are packed with atoms, according to the team. This means electrons passing through them collide, sl...
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HYDROGEN OR BATTERIES? Which is best?

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Hydrogen  Vs  Batteries Hydrogen cars   have long ranges RANGE: 700+ km. REFUELING : In a few minutes. CHALLENGE: Few filling stations and expensive production method. ADVANTAGE: Hydrogen can store energy from renewable sources such as solar cells and wind turbines. Battery-powered cars get   their energy from the grid RANGE: A maximum of 500 km. RECHARGING: 1-12 hours. CHALLENGE: Short range and very long charging time. ADVANTAGE: Communicate with the future grid, so the power can be as cheap as possible. Hydrogen stores energy well   The major sales argument for hydrogen is its   ability to store energy. Hydrogen contains 120   mega joules  of energy per kg – compared to 44   for petrol. At best, batteries can store 2-3   mega joules  per kg. a   fully   fueled hydrogen   car has a range of 6-700 km, which is about the   same ...
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