Automatic focusing method and system

An exemplary auto focus method for use in video cameras including a focus lens includes: focusing the pickup lens and capturing a current image and a prior image; calculating two contrast estimation values of the current image and the prior image; and judging whether a difference between the contras...

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Bibliographische Detailangaben
1. Verfasser:	CAI SHENGFU
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY HOLOGRAPHY PHOTOGRAPHY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:	An exemplary auto focus method for use in video cameras including a focus lens includes: focusing the pickup lens and capturing a current image and a prior image; calculating two contrast estimation values of the current image and the prior image; and judging whether a difference between the contrast estimation value of the current image and that of the prior image exceeds a predetermined threshold, if yes, refocusing the pickup lens, if no, keeping focus status of the pickup lens unchanged and capturing a subsequent image.