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

Claim 4:
5. A motion detecting method for a security camera comprising an image sensor, comprising:
(a) capturing a plurality of original images by the image sensor;
(b) computing image variation levels of the original images;
(c) calculating a first average level for the image variation levels corresponding to M of the original images;
(d) calculating a second average level for the image variation levels corresponding to N of the original images, wherein M>N;
(e) determining 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; and
(f) recording images or generating a message to inform a user if the step (e) determines the motion of the object occurs;
wherein the step (b) 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;
wherein the image sensor comprises a plurality of sensing regions, wherein different ones of the sensing regions have different ones of the motion thresholds.