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Google explains the Pixel 2’s super-stable video recording

Google’s Pixel 2 phones have a clever trick up their sleeve when recording video: they can use both electronic and optical image stabilization, delivering largely jitter-free clips even if you’re walking down the street. But how does it meld those two technologies, exactly? Google is happy to explain: it just posted an in-depth exploration of how this stabilization works. As you might guess, Google uses some of its machine learning know-how to incorporate both anti-shake technologies where many phones can only use one or the other.

The system starts off by collecting motion info from both OIS and the phone’s gyroscope, making sure it’s in “perfect” sync with the image. But it’s what happens next that matters most: Google uses a “lookahead” filtering algorithm that pushes image frames into a deferred queue and uses machine learning to predict where you’re likely to move the phone next. This corrects for a wider range of movement than OIS alone, and can counteract common video quirks like wobbling, rolling shutter (the distortion effect where parts of the frame appear to lag behind) or focus hunting. The algorithmic method even introduces virtual motion to mask wild variations in sharpness when you move the phone quickly.

This isn’t to say that Google’s approach is flawless. As others have noted, the Pixel 2 can crop the frame in unexpected ways and blur low light footage more than it should. On the balance, though, this shows just how much AI-related technology can help with video. It can erase typical errors that EIS or OIS might not catch by themselves, and produces footage so smooth it can look like it was captured with the help of a gimbal.

Source: Google Research Blog

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Ms. A. C. Kennedy
My name is Ms A C Kennedy and I am a Health practitioner and Consultant by day and a serial blogger by night. I luv family, life and learning new things. I especially luv learning how to improve my business. I also luv helping and sharing my information with others. Don't forget to ask me anything!

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Existing EV batteries could be recharged five times faster

Lithium-ion batteries have massively improved in the last half-decade, but there are still issues. The biggest, especially for EVs, is that charging takes too long to make them as useful as regular cars for highway driving. Researchers from the University of Warwick (WMG) have discovered that we may not need to be so patient, though. They developed a new type of sensor that measures internal battery temperatures and discovered that we can probably recharge them up to five times quicker without overheating problems.

Overcharging a lithium-ion battery anode can lead to lithium buildup, which can break through a battery's separator, create a short-circuit and cause catastrophic failure. That can cause the electrolyte to emit gases and literally blow up the battery, so manufacturers impose strict charging power limits to prevent it.

Those limits are based on hard-to-measure internal temperatures, however, which is where the WMG probe comes in. It's a fiber optic sensor, protected by a chemical layer that can be directly inserted into a lithium-ion cell to give highly precise thermal measurements without affecting its performance.

The team tested the sensor on standard 18650 li-ion cells, used in Tesla's Model S and X, among other EVs. They discovered that they can be charged five times faster than previously thought without damage. Such speeds would reduce battery life, but if used judiciously, the impact would be minimized, said lead researcher Dr. Tazdin Amietszajew.

Faster charging as always comes at the expense of overall battery life but many consumers would welcome the ability to charge a vehicle battery quickly when short journey times are required and then to switch to standard charge periods at other times.

There's still some work to do. While the research showed the li-ion cells can support higher temperatures, EVs and charging systems would have to have "precisely tuned profiles/limits" to prevent problems. It's also not clear how battery makers would install the sensors in the cells.

Nevertheless, it shows a lot of promise for much faster charging speeds in the near future. Even if battery capacities stayed the same, charging in 5 minutes instead of 25 could flip a lot of drivers over to the green side.

Via: Clean Technica

Source: University of Warwick

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