Title :
A parametric non-linear algorithm for contrast based auto-focus
Author :
Florea, Corneliu ; Florea, Laura
Author_Institution :
Image Process. & Anal. Lab., Univ. Politeh. of Bucharest, Bucharest, Romania
Abstract :
Automatic estimation of the lens position that provides the sharpest image given a subject scene is known as auto-focus. In this paper a new passive contrast based auto-focus algorithm for digital still and video cameras is proposed. The solution originates in the parametrization of NIP (Non-linear Image Processing) models . The closing property of these models allows superior performance especially for bright areas if compared with state of the art methods.
Keywords :
image resolution; optical self-focusing; photographic lenses; video cameras; video signal processing; NIP method; automatic lens position estimation; digital still camera; nonlinear image processing model; parametric nonlinear algorithm; passive contrast based autofocus algorithm; sharp image; video camera; Cameras; Equations; Estimation; Image processing; Laplace equations; Lenses; Mathematical model;
Conference_Titel :
Intelligent Computer Communication and Processing (ICCP), 2011 IEEE International Conference on
Conference_Location :
Cluj-Napoca
Print_ISBN :
978-1-4577-1479-5
Electronic_ISBN :
978-1-4577-1481-8
DOI :
10.1109/ICCP.2011.6047879
