Method and system for auto-focusing

Photography – With exposure objective focusing means – focusing aid – or... – Single focus area with variable size or location

Reexamination Certificate

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C396S121000, C348S349000

Reexamination Certificate

active

08036522

ABSTRACT:
Method and system for auto-focusing. The method includes checking for presence of a subject in a first frame. The method also includes determining a second frame indicative of an in-focus position of the subject if the presence of the subject is detected. The method further includes causing to focus on the subject based on the second frame. Further, the method includes checking for a change in at least one of location of the subject in the second frame, and sharpness and luminance in an area corresponding to the subject in the second frame. Moreover, the method includes causing to refocus on the subject if the change is detected.

REFERENCES:
patent: 2008/0068487 (2008-03-01), Morita
Wei You, Hao Jiang, ZE-Nian Li, “Real-time multiple object tracking in smart environments”, IEEE, pp. 818-823, 2008.
Vidit Saxena, Sarthak Grover, Sachin Joshi, “A Real Time Face Tracking System using Rank Deficient Face Detection and Motion Estimation”, IEEE 7th International Conference, pp. 1-6, Sep. 9-10, 2008.
M. Gamadia, N. Kehtarnavaz, “A real-time continuous automatic focus algorithm for digital cameras”, IEEE Southwest Symposium on Image Analysis and Interpretation, pp. 163-167, 2006.
Ng Kuang Chern, Nathaniel, Poo Aun Neow and Marcelo H. Ang Jr., “Practical Issues in pixel-based autofocusing for machine vision”, IEEE, pp. 2791-2796, 2001.
M. Rubino, A. Cruz, J.R. Jimenez, F. Perez and E. Hitan, “An original device for the automatic measurement of the luminance distribution in an observer's visual field” Meas. Sci. Techno. vol. 7, pp. 42-51, 1996.

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