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

Claim 0:
1. An optical navigation device having a plurality of different tracking modes, comprising:
an image sensor, arranged for sensing and generating a plurality of image frames; and
a processing circuit, coupled to the image sensor, arranged for 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 a first surface operation condition into a second surface operation condition, the processing circuit being used to determine whether the optical navigation device changes from the first surface operation condition into the 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;
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.