Patent ID: 7567341

Claim:
A method for adapting an optical navigation device for navigation on a transparent structure where the transparent structure overlays an opaque surface, the method comprising: establishing a navigation window for navigation tracking; detecting reflected light within the navigation window; generating an output signal in response to the detected light; and adjusting a characteristic of the navigation window in response to the output signal, wherein adjusting a characteristic of the navigation window comprises: adjusting a characteristic of the navigation window to primarily detect light that is reflected from the opaque surface when the amount of detected light that is reflected from the opaque surface is greater than the amount of detected light that is reflected from a top surface of the transparent structure; and adjusting a characteristic of the navigation window to primarily detect light that is reflected from the top surface of the transparent structure when the amount of detected light that is reflected from the top surface of the transparent structure is greater than the amount of detected light that is reflected from the opaque surface.