Patent ID: 8744255

Claim:
An auto-focus method adapted for an image capturing device, the auto-focus method comprising: determining whether a first press signal generated by a user pressing a button of the image capturing device is detected; if the first press signal is detected, applying a local peak searching method to perform an auto-focus procedure; determining whether a second press signal generated by the user pressing the button is detected; if the second press signal is not detected, determining whether a first released signal generated by the user releasing the button is detected and calculating a continuous pressing count according a number of times the user presses the button and each of the continuous pressing count is upcounted by one by the user pressing the button once and releasing the button once; and determining whether the continuous pressing count is greater than a first threshold, and the first threshold is greater than or equal to three; if the continuous pressing count is greater than the first threshold, applying a global peak searching method to perform the auto-focus procedure; if the continuous pressing count is not greater than the first threshold, applying the local peak searching method to perform the auto-focus procedure.