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Wavefront coding, which permits joint optimization of special optics and signal processing to form the best images, increases imaging quality, reduces size, and reduces overall costs. Wavefront coding, an old concept, is now being used in mobile phone cameras where there are requirements for close focusing, low-height optics, and low tolerance assembly, along with a need for high target yields. In such systems, the technology permits optics, sensors, and processors to be jointly optimized. While conventional imaging systems generate the best possible image, they can be costly, large, and very sensitive, all of which result in more cost. The drawbacks cannot be bested by changing only the optics, but Wavefront coding depends on specialized optical wavefronts of the imaging system that code formed images. Signal processing does decoding to render all part of the designed object volume as sharp and clear. Topics covered are improving focus, the multidimensional advantage, design tradeoffs, and focus errors. The designer controls the ways in which the system is optimized for each application and the ways in which tradeoffs are made, due to application requirements. Only joint optimization can resolve stagnancy in the mobile phone camera industry.
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