Researchers at Xi'an Jiaotong University in China have built a single-pixel camera that can capture images of objects even when they are not in direct view.
Single-pixel cameras can produce images using a single pixel to detect light by randomizing the light intensity to be detected by the pixel, correlating with the scene in front of the pixel. Data is then mined to find the correlation and recreate the image, and by recording the intensity of light thousands of times, it is possible to create a high-resolution image.
To test their camera, researchers illuminated an object with light from a projector that produces a random pattern of illuminated squares. The object was placed next to a white wall that scattered light toward the single pixel, which did not have a clear view of the object; this pixel then recorded the light intensity scattered from the wall. The process was repeated about 50,000 times, and a data-mining algorithm sorted through the data to create the image. The resulting image clearly matched the target object, and the team says further improvements to image resolution can be made by optimizing the algorithm and reducing the size of the illuminated squares in the random pattern of projected light.
From Technology Review
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