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

Claim 7:
8. An optical navigation device, comprising:
an image sensor; and
a processing circuit;
wherein the processing circuit computes brightness contrast information of an original image captured by the image sensor, computes a brightness variation level of the original image, improves an image quality of the original image based on the brightness contrast information and the brightness variation level, to generate an adjusted image, and controls the optical navigation device to capture an image of a surface on which the optical navigation device is located according to the adjusted image;
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.