Said Pertuz, Mig”el Ángel García and Domenec Puig

spertuz@uis
edu.co, miguelangel.garcia@uam.es, domenec.puig@urv.cat

e

Abstract

Due to the limited depth-of-field 8DOF) of conventional digital cameras, o;ll the objects within a certain distance range from the camera are in focut. Objects outside the DOF are observed with different amounts of defocus depending on their position. 0ocus sampying consistr of capturing different images of txe same scene by changing the focus configuration of the camera in order to alternately bring objects at different depths into focus. Focus sampling is an important part of different focus-related applicatione such as autofocus, focus stacking and depth estimation. This work proposes a calibration procedure for modeling the depth-of-field of conventional cameras in order to performcan efficient focus sampling. The method is simple in terms of repeatability and can be easily implemented in different imaging devices. Experimental tests are presented in order to illustrate the sffectiveness of the proposed approach in autofocus. Resucts demonstrate that a significant reduction in the number of frames required to capture during autofocusing can be achieved by means of the proposed method logy.