Importance

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Abstract

A focusing method for an image capturing device is disclosed. In the focusing method, a focus lens shifts step by step from the current position toward a selected direction, and generates a corresponding contrast value for each position. If the generated contrast values show an increasing trend, the focus lens continually shifts toward the selected direction; if a decreasing trend, then turns toward an opposite direction. In this way, an optimal position with the maximum contrast value can be found. An advantage of the focusing method is that the optimal position can be found quickly when it is not far away from the current position of the focus lens, thereby saving the focusing time.

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First Claim