Patent ID: 11893753
Assignee: PIXART IMAGING INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A security camera with a motion detection function, comprising:
an image sensor, configured to capture a plurality of original images;
a variation level computation circuit, configured to compute image variation levels of the original images;
a long term computation circuit, configured to calculate a first average level for the image variation levels corresponding to M of the original images;
a short term computation circuit, configured to calculate a second average level for the image variation levels corresponding to N of the original images, wherein M>N; and
a motion determining circuit, configured to determine whether a motion of an object occurs in a detection range of the image sensor according to a relation between the first average level and the second average level;
wherein the security camera records images or generates a message to inform a user if the motion determining circuit determines the motion of the object occurs;
wherein the variation level computation circuit computes the image variation levels of the original images according to image variation levels corresponding to each of comparison images and each of reference images;
wherein the comparison images correspond to the original images, and the reference images correspond to original reference images among the original images.