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An autofocus technique for imaging microscopy
[Proceedings] ICASSP-92: 1992 IEEE International Conference on Acoustics, Speech, and Signal Processing, 1992The authors present an automatic focus (autofocus) technique for imaging microscopy. The technique successfully finds the optimum focus position for large working distance/small depth of focus optics. High throughput is realized by a combination linear-to-nonlinear digital signal processing algorithm.
E. Hughlett, P. Kaiser
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Checking and Transforming Models with AutoFOCUS
12th IEEE International Conference and Workshops on the Engineering of Computer-Based Systems (ECBS'05), 2005The construction of increasingly sophisticated software systems demands techniques to reduce the complexity of the development process by supplying automated steps. In a model-based approach, operations to analyse and transform models of the system can be used to supply some automation for the development process.
Bernhard Schätz +3 more
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Enhancement of phase detection for autofocus
2017 IEEE International Conference on Image Processing (ICIP), 2017Phase detection autofocus (PDAF) is a technique that uses sensors on left and right pixels to determine the relative position between the object and the focal plane. When an image is out of focus, a shift between the assembled left and right pixels is resulted, which can be used to determine the lens movement during the autofocus process.
Chin-Cheng Chan +2 more
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Autofocus for a multiscale gigapixel camera
Applied Optics, 2013In recent studies, the advanced wide field of view architectures for image reconstruction and exploitation (AWARE) multiscale camera, which is composed of a monocentric objective lens and an array of microcameras, was developed for the realization of snapshot wide field of view and high resolution imaging. This paper describes accelerated autofocus (AF)
Tomoya Nakamura +5 more
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Revisiting Autofocus for Smartphone Cameras
2018Autofocus (AF) on smartphones is the process of determining how to move a camera’s lens such that certain scene content is in focus. The underlying algorithms used by AF systems, such as contrast detection and phase differencing, are well established.
Abdullah Abuolaim +2 more
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Autofocus survey: a comparison of algorithms
SPIE Proceedings, 2007There are numerous passive contrast sensing autofocus algorithms that are well documented in literature, but some aspects of their comparative performance have not been widely researched. This study explores the relative merits of a set of autofocus algorithms via examining them against a variety of scene conditions.
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Ultramicroscopy, 1987
Abstract Autofocus and correction of astigmatism of a transmission electron microscope (TEM) based on measuring a beam-tilt-induced image displacement is proposed and its theoretical limitations are studied. Tilting the illumination beam displaces the specimen image on screen when the TEM is out of focus.
A.J. Koster +2 more
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Abstract Autofocus and correction of astigmatism of a transmission electron microscope (TEM) based on measuring a beam-tilt-induced image displacement is proposed and its theoretical limitations are studied. Tilting the illumination beam displaces the specimen image on screen when the TEM is out of focus.
A.J. Koster +2 more
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AutoFocus: Semantic Search for the Desktop
Ninth International Conference on Information Visualisation (IV'05), 2006Desktop search is a new application area for information retrieval technologies, focused on searching in the local information sources on a user's PC These applications typically operate as local search engines and consequently exhibit all problems associated with full-text search.
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Comparison of Phase-Gradient Autofocus and Sharpest-Image Autofocus in ISAR Imaging
2023 16th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI), 2023Zhou Wu +3 more
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2014
Autofocus allows us to generate images with better quality by automatically adjusting the image focusing parameters. For radar imaging, autofocus means to automatically correct phase errors based on collected radar returns from targets. Inverse synthetic aperture radar (ISAR) motion compensation includes range alignment and phase adjustment.
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Autofocus allows us to generate images with better quality by automatically adjusting the image focusing parameters. For radar imaging, autofocus means to automatically correct phase errors based on collected radar returns from targets. Inverse synthetic aperture radar (ISAR) motion compensation includes range alignment and phase adjustment.
openaire +1 more source