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To reduce noise in a thin, lensless camera, researchers at Tsinghua University and MIT built an imaging system with a Fresnel zone aperture (FZA). In addition to introducing a Fresnel optical element into the camera, the researchers used a compressive sensing algorithm to improve the quality of reconstructed images. The FZA was placed 3 mm in front of a CMOS image sensor. The signal recorded by the CMOS sensor was reconstructed by the compressive sensing algorithm with total variation denoising to generate an improved image of the object.
Although the Fresnel zone plate could be used as an imaging element similar to the lens, its long focal length could not support a thin structure. “If we can obtain the light field on…READ MORE