Abstract
Images taken of 3D objects are generally defocused. Depth-from-focus techniques use the defocus information to determine range. However, quantitative measurement of focus is difficult and requires accurate modeling of the point-spread function (PSF). We describe a new method that determines depth using the symmetry and smoothness of focus gradient with respect to the focus position. The technique is passive and uses a monocular imaging system. The performance for estimating range is experimentally demonstrated.
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Xu, S., Capson, D.W. & Caelli, T.M. Range measurement from defocus gradient. Machine Vis. Apps. 8, 179–186 (1995). https://doi.org/10.1007/BF01215813
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DOI: https://doi.org/10.1007/BF01215813