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Cameră mică de mărimea grăuntelor de sare realizează imagini full-color de înaltă rezoluție PDF Imprimare
Marţi, 30 Noiembrie 2021 13:12
                             The tiny new camera sensor measures just half a millimeter wide
   Researchers at Princeton and the the University of Washington have developed a tiny camera, the size of a grain of salt, which can snap sharp, full-color images. It’s made with a metasurfacethat captures light, which could be scaled up to turn entire surfaces into sensors.
    The device looks like little more than a clear panel with a circular pattern etched into it. That half-millimeter-wide circle contains 1.6 million cylinders, each carefully designed to bend light in just the right way so that the array as a whole shapes the optical wavefront. Signal processing algorithms then produce an image from that data.
    The resulting images are far more crisp than other small sensors. In tests, the team showed that the new sensor captured images measuring 720 x 720 pixels in full color, capturing wavelengths between 400 and 700 nm in natural light, with a spatial resolution of 214 line pairs per mm. It has a field of view of 40 degrees and an f-number of 2, and the researchers say that the shots are on par with those captured by a conventional compound camera lens that’s half a million times bigger than their new sensor.
     The post-processing algorithms do much of the heavy lifting in improving the image quality, and these were designed alongside the metasurface to ensure they worked well together.
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