Abstract
We address two different methods to enhance the depth of focus (DOF) according to the application, using amplitude and/or phase masks. The first application consists in increasing the length of the focal line of an optic while preserving its transverse resolution. We propose a novel type of mask inspired from holographic principles that have some advantages compared with the classical binary-phase mask. We then address DOF enhancement in a hybrid imaging system composed of a pupil mask and a digital deconvolution step. We define an optimization criterion based on the final image quality and use it to determine the optimal parameters of phase masks. We show that the parameters may not correspond to point spread functions that are strictly invariant with respect to defocus.
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Diaz, F., Goudail, F., Loiseaux, B., Huignard, JP. (2010). Hybrid Imaging Systems for Depth of Focus Extension With or Without Postprocessing. In: Javidi, B., Fournel, T. (eds) Information Optics and Photonics. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-7380-1_19
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DOI: https://doi.org/10.1007/978-1-4419-7380-1_19
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