METHOD, APPARATUS, AND SYSTEM FOR ACQUIRING VISUAL ANGLE

• US 20140111643A1
• Filed: 12/31/2013
• Published: 04/24/2014
• Est. Priority Date: 11/08/2011
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Yang, Zhiquan
• Granted Patent: US 9,800,841 B2
• Time in Patent Office: Days
• US Class Current: 348/143
• CPC Class Codes: G01S 3/786 the desired condition being maintained automatically
• CPC Class Codes: G08B 13/1963 Arrangements allowing camera rotation to change view, e.g. pivoting camera, pan-tilt and zoom [PTZ]
• CPC Class Codes: G08B 13/19636 pertaining to the camera
• CPC Class Codes: H04N 23/695 Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source

Abstract

Embodiments of the present invention relate to the field of video monitoring and provide a method, an apparatus, and a system for acquiring a visual angle, so as to acquire an accurate visual angle value. The method for acquiring a visual angle includes: receiving, by a central processing unit CPU of a camera, angle information that is sent by an accelerometer sensor arranged on the camera; converting, by the CPU, the received angle information to a visual angle value; sending, by the CPU, the visual angle value to a server, so that a client receives the visual angle value forwarded by the server. The embodiments of the present invention are applicable to a video monitoring scenario.

Claims

1. A method for acquiring a visual angle, the method comprising:

receiving, by a central processing unit (CPU) of a camera, angle information that is sent by an accelerometer sensor arranged on the camera;

converting, by the CPU, the received angle information to a visual angle value; and

sending, by the CPU, the visual angle value to a server, so that a client receives the visual angle value forwarded by the server.

2. The method according to claim 1, wherein before converting, by the CPU, the received angle information to a visual angle value, the method comprises:

cyclically determining, by the CPU, whether angle information received this time is consistent with that received last time; and

if the angle information received this time is inconsistent with that received last time, performing a next step.

3. The method according to claim 2, further comprising:

receiving, by the CPU, a specified visual angle value sent by the server;

converting, by the CPU, the specified visual angle value to a pan-tilt-zoom rotation angle; and

sending, by the CPU, the pan-tilt-zoom rotation angle to a pan-tilt-zoom control board, so that the pan-tilt-zoom control board controls the camera to rotate to a specified angle.

4. The method according to claim 1, wherein sending, by the CPU, the visual angle value to a server comprises:

actively sending, by the CPU, the visual angle value to the server;

or

sending, by the CPU, the visual angle value to the server according to request information of the server.

5. A camera, comprising:

a central processing unit (CPU), a pan-tilt-zoom control board, and an accelerometer sensor, and wherein;

the CPU is configured to;

receive angle information that is sent by the accelerometer sensor arranged on the camera;

convert the received angle information to a visual angle value; and

send the visual angle value to a server, so that a client receives the visual angle value forwarded by the server.

6. The camera according to claim 5, wherein the CPU is further configured to cyclically determine whether angle information received this time is consistent with that received last time until the angle information received this time is inconsistent with that received last time.

7. The camera according to claim 6, wherein the CPU is further configured to:

receive a specified visual angle value sent by the server;

convert the specified visual angle value to a pan-tilt-zoom rotation angle; and

send the pan-tilt-zoom rotation angle to the pan-tilt-zoom control board, so that the pan-tilt-zoom control board controls the camera to rotate to a specified angle.

8. A system for acquiring a visual angle, comprising:

a camera, a server, and a client, wherein the camera is the camera according to claim 5, and wherein the server is configured to receive a visual angle value sent by a central processing unit (CPU) of the camera and send the visual angle value to the client.

9. The system according to claim 8, wherein the CPU is configured to cyclically determine whether angle information received this time is consistent with that received last time until the angle information received this time is inconsistent with that received last time.

10. The system according to claim 9, wherein the CPU is further configured to:

receive a specified visual angle value sent by the server;

convert the specified visual angle value to a pan-tilt-zoom rotation angle; and

send the pan-tilt-zoom rotation angle to the pan-tilt-zoom control board, so that the pan-tilt-zoom control board controls the camera to rotate to a specified angle.

11. The system according to claim 8, wherein the server is further configured to:

store the visual angle value;

receive a specified visual angle value sent by the client; and

send the specified visual angle value to the CPU, so that the CPU rotates the camera to a specified angle according to the specified visual angle value.