Patent ID: 11947737
Assignee: PIXART IMAGING INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 3:
4. An optical navigation device, comprising:
an image sensor; and
a processing circuit;
wherein the processing circuit computes brightness contrast information of original images captured by the image sensor, computes brightness variation levels of the original images, improves image qualities of the original images based on the brightness contrast information and the brightness variation levels, to generate adjusted images, and computes movements of the optical navigation device based on displacement between the adjusted images;
wherein the optical navigation device is located on a surface;
wherein the processing circuit performs following steps to determine a type of the surface:
collecting reference images of different parts of the surface for a plurality of combinations of moving directions of the optical navigation device and placement directions of the surface; and
determining the type of the surface via comparing images of a current surface with the reference images.