25 Feb '13, 7pm

Camera Chip Makes Already-Compressed Images

Camera Chip Makes Already-Compressed Images

Illustration: Emily Cooper Click on image to enlarge. Bothered by how quickly recording video drains your smartphone battery? There’s no app for that—but there may soon be a chip. Researchers at Sony and Stanford have constructed an imaging chip that incorporates a new technology called compressed (or compressive) sensing, to radically reduce battery drain by compressing video frames before they’re digitized. 
 The problem with mobile video is this: Recording an image requires analog-to-digital conversions—lots of them. And each conversion consumes some energy. For a single conversion, it’s not much, say a hundredth of a microjoule. But suppose your phone has an image sensor of 1080 by 1920 pixels. To capture one image, it must complete nearly 2.1 million conversions. So you need to multiply the energy of each A-to-D conversion by 2.1 million and then multiply the result b...

Full article: http://spectrum.ieee.org/semiconductors/optoelectronics/c...

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