Patent ID: 11921940
Assignee: PIXART IMAGING INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 9:
10. A method of an optical navigation device having a plurality of different tracking modes, and the method comprises:
using an image sensor to sense and generate a plurality of image frames; and
determining whether the optical navigation device changes from a first surface operation condition into a second surface operation condition by detecting a change of an image quality of an image pattern with image features in the plurality of image frames and by detecting a change of a frame average brightness of the plurality of image frames;
controlling and changing a tracking mode of the optical navigation device from a first tracking mode into a second tracking mode in response to an event that the optical navigation device changes from the first surface operation condition into the second surface operation condition;
wherein the first surface operation condition and the second surface operation condition are respectively associated with different tracking surfaces on which the optical navigation device placed; at least one of the different tracking surfaces is characterized by a high reflectivity or a low surface roughness; a power consumption of the optical navigation device is different after the tracking mode switches from the first tracking mode into the second tracking mode.