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Reference.org
Focus recovery based on the linear canonical transform
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<p>For <a href="/facts/Digital_image_processing/zenalNCf">digital image processing</a>, the <a href="/facts/Deblurring/YFxq5T6h">Focus recovery</a> from a defocused image is an ill-posed problem since it loses the component of high frequency. Most of the methods for focus recovery are based on depth <a href="/facts/Estimation_theory/4nbgFDec">estimation theory</a>. The <a href="/facts/Linear_canonical_transform/TTUqqAfV">Linear canonical transform</a> (LCT) gives a scalable kernel to fit many well-known optical effects. Using LCTs to approximate an optical system for imaging and inverting this system, theoretically permits recovery of a defocused image. </p>