Patent ID: 7880801
Filing Date: 2011-02-01
Classification: G03B

Abstract:
1. A system for assisting fixed-focus image-capturing device to focus, comprising: an image-capturing device with fixed-focus function; a platform, for placing an object to be photographed, the platform including at least one specific marker; a movable structure connected to the image-capturing device or the platform, for adjusting the distance between the image-capturing device and the platform; a notifying unit, for generating a physical quantity to notify a user; and a control unit in communication with the image-capturing device and the notifying unit, for determining the distance between the image-capturing device and the platform and, when the distance between the image-capturing device and the platform equals a best-shot distance, sending a signal to the notifying unit to notify the user, wherein a geometric variable of an image of the specific marker on a display screen varies with the distance between the image-capturing device and the platform, and the variation of the geometric variable is used by the control unit to determine the distance between the image-capturing device and the platform.