Monitor camera system and auto-tracing implementation method using the same

• US 7,151,558 B1
• Filed: 08/29/2000
• Issued: 12/19/2006
• Est. Priority Date: 08/31/1999
• Status: Expired due to Term

• Current Assignee: Security Video Camera Systems Inc. (Wi-LAN Inc.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Higuchi, Kazutaka, Kogane, Haruo, Tamura, Kazushige
• Primary Examiner(s): Vo, Tung
• Application Number:
  US09/649,174
• Time in Patent Office: 2,303 Days
• Field of Search: 348/143, 348/139, 348/142, 348/151, 348/169, 348/170, 348/15, 348/211.1, 348/52, 348/211.99, 348/211.4, 348/211.14, 348/211.6, 348/159, 348/152, 348/14.04, 356/139.06, 380/28, 345/723, 709/323
• US Class Current: 348/151
• CPC Class Codes: G08B 13/19608 Tracking movement of a target, e.g. by detecting an object predefined as a target, using target direction and or velocity to predict its new position
• 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 13/19673 Addition of time stamp, i.e. time metadata, to video stream
• CPC Class Codes: G08B 13/19689 Remote control of cameras, e.g. remote orientation or image zooming control for a PTZ camera
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source

Abstract

In a monitor camera system comprising a monitor camera rotatable through 360 degrees in panning directions and through 90 degrees or more in tilting directions and a control unit for controlling the monitor camera, the monitor camera holds an auto-tracing record including a command sent from the control unit and a time stamp indicative of a reception point of the command on a time base in auto-tracing learning, and reads out the auto-tracing record at implementation of auto-tracing to execute the command in the auto-tracing record at the corresponding point on the time base. With the configuration of the monitor camera system, the monitor camera is made to retain the commands for the auto-tracing implementation, which can prevent a delay of the operation of the monitor camera stemming from a delay in control data transmission.

Claims

1. A monitor camera system comprising:

a monitor camera rotatable in panning directions and in tilting directions and having control means, a timer and a memory; and

a controller, disposed outside said monitor camera, for controlling said monitor camera, wherein

said control means of the monitor camera receives a first instruction from said controller,

said control means starts the timer on a first time base in response to the first instruction,

said controller receives a command and sends the command and a time stamp indicative of a reception time of the command on the first time base to the control means of the monitor camera,

said control means holds an auto-tracing record including the command and the time stamp sent from said controller in the memory in auto-tracing learning,

said control means receives a second instruction from said controller,

said control means again starts the timer on a second time base in response to the second instruction, starts auto-tracing implementation in response to the second instruction, reads out the auto-tracing record from the memory without control of said controller, and executes the command of said auto-tracing record in the auto-tracing implementation at an executing time of the second time base corresponding to the reception time indicated by the time stamp of the auto-tracing record to cause the monitor camera to conduct a monitoring operation according to the auto-tracing record without control of said controller, and

at the auto-tracing implementation, said monitor camera interprets a constant recording speed indicated by the timer as a constant reproduction speed different from the constant recording speed by a predetermined rate to implement the auto-tracing, which is learned at the constant recording speed in the auto-tracing learning, at the constant reproduction speed in said auto-tracing implementation.

2. A monitor camera system according to claim 1, wherein said controller receives a plurality of commands one after another, and sends each of the commands and a time stamp indicative of a reception time of the command on the first time base to the monitor camera, said monitor camera executes each of the received commands at an executing time on the second time base corresponding to the reception time indicated by the corresponding time stamp in order of increasing the reception time as indicated by the time stamp.

3. A monitor camera system according to claim 2, wherein data for setting a camera field angle or a camera scene is recorded at the head of said auto-tracing record, and a camera state at the start of the auto-tracing implementation is set on the basis of the setting data.

4. A monitor camera system according to claim 1, wherein said monitor camera achieves 360-degree pan rotation and 180-degree tilt rotation.

5. A monitor camera system according to claim 1, wherein said control means determines a shortest path from a present camera position to a predetermined position specified by the command of said auto-tracing record, and said control means moves the monitor camera through the shortest path in tilt rotation and/or pan rotation to direct the monitor camera toward the predetermined position.

6. A monitor camera system according to claim 5, wherein the monitor camera is rotatable through 360 degrees in the panning directions and through 90 degrees or more in the tilting directions, pieces of image data obtained in the monitor camera in the monitoring operation are stored in an image memory of the monitoring camera in a photographing order, and the pieces of image data are read out from the image memory in an order reverse to the photographing order when the tilt rotation passes through zero degree.

7. An auto-tracing implementation method for use in a monitor camera rotatable in panning directions and in tilting directions, the monitor camera comprising a control means, a timer and a memory, said method comprising the steps of:

receiving a first instruction, transmitted from a controller disposed outside the monitor camera, in said control means of the monitor camera;

starting the timer of said monitor camera on a first time base in response to the first instruction;

receiving a command in said controller;

receiving in the control means both a command received in the controller and a time stamp indicative of a reception time of the command on the first time base from the controller;

making said monitor camera record, in the memory thereof, the command and the time stamp sent from said controller as an auto-tracing record in auto-tracing learning;

when receiving a second instruction for implementation of auto-tracing from said controller, again starting the timer on a second time base in response to the second instruction under control of the control means;

starting auto-tracing implementation under control of the control means in said monitor camera in response to the second instruction;

reading, in said monitor camera, said auto-tracing record from said memory under control of the control means; and

executing, in said monitor camera under control of the control means, said command of said auto-tracing record at an executing time on the second time base corresponding to the reception time indicated by the time stamp of the auto-tracing record to conduct a monitoring operation according to the auto-tracing record, and

wherein, in said monitor camera, at the auto-tracing implementation, interpretation on the time base is made in a different manner from that in said auto-tracing learning such that the step of executing said command of said auto-tracing record includes interpreting a constant recording speed indicated by the timer as a constant reproduction speed different from the constant recording speed by a predetermined rate to implement the auto-tracing, which is learned at the constant recording speed in the auto-tracing learning, at the constant reproduction speed different from that in said auto-tracing learning implementation.

8. An auto-tracing implementation method for use in a monitor camera system according to claim 7, wherein, after completion of said auto-tracing learning, said auto-tracing record stored in said memory is transferred from said monitor camera to said controller so that said controller holds said auto-tracing record, and at the auto-tracing implementation, said auto-tracing record is transferred from said controller to said memory of said monitor camera.

9. An auto-tracing implementation method for use in a monitor camera system according to claim 7, wherein, in said monitor camera, at auto-tracing recording or in auto-tracing reproduction, data representative of an auto-tracing operation state is displayed in a state superimposed on a monitor picture taken by said monitor camera.

10. A monitor camera rotatable in panning directions and in tilting directions, comprising:

a timer;

a memory;

control means for receiving a first instruction from a controller disposed outside the monitor camera, starting the timer on a first time base in response to the first instruction, receiving from the controller both a command received in the controller and a time stamp indicative of a reception time of the command on the first time base, holding an auto-tracing record including the command and the time stamp in the memory in auto-tracing learning, receiving a second instruction from the controller, again starting the timer on a second time base in response to the second instruction, starting auto-tracing implementation in response to the second instruction, reading out the auto-tracing record from the memory, and executing the command of the auto-tracing record in the auto-tracing implementation at an executing time of the second time base corresponding to the reception time indicated by the time stamp of the auto-tracing record to cause the monitor camera to conduct a monitoring operation according to the auto-tracing record,

wherein, at the auto-tracing implementation, the monitor camera interprets a constant recording speed indicated by the timer as a constant reproduction speed different from the constant recording speed by a predetermined rate to implement the auto-tracing, which is learned at the constant recording speed in the auto-tracing learning, at the constant reproduction speed in said auto-tracing implementation.

11. A monitor camera according to claim 10, wherein said control means receives from the controller a plurality of commands and a time stamp indicative of a reception time of each of the commands on the first time base, and the monitor camera executes each of the received commands at an executing time of the second time base corresponding to the reception time indicated by the corresponding time stamp in order of increasing the reception time indicated by the time stamp.

12. A monitor camera according to claim 11, wherein data for setting a camera field angle or a camera scene is recorded at a head of the auto-tracing record, and a camera state at the start of the auto-tracing implementation is set on the basis of the setting data.

13. A monitor camera according to claim 10, wherein the control means controls tilt rotation and pan rotation of the monitor camera to achieve 360-degree pan rotation and 180-degree tilt rotation of the monitor camera.

14. A monitor camera according to claim 10, wherein the control means determines a shortest path from a present camera position to a predetermined position specified by the command of the auto-tracing record, and the control means controls the monitor camera to move through the shortest path in tilt rotation and/or pan rotation and to direct the monitor camera toward the predetermined position.

15. A monitor camera system according to claim 10, wherein the control means controls the monitor camera to rotate the monitor camera through 360 degrees in the panning directions and through 90 degrees or more in the tilting directions, pieces of image data obtained in the monitor camera in the monitoring operation are stored in an image memory of the monitoring camera, in a photographing order, and the pieces of image data are read out from the image memory in an order reverse to the photographing order when the tilt rotation passes through zero degree.

16. A monitor camera system comprising:

a monitor camera rotatable in panning directions and in tilting directions and having control means, a timer and a memory; and

a controller, disposed outside said monitor camera, for controlling said monitor camera,

wherein said control means of the monitor camera receives a first instruction from said controller,

said control means starts the timer on a first time base in response to the first instruction,

said controller receives a command and sends the command and a time stamp indicative of a reception time of the command on the first time base to the control means of the monitor camera,

said control means holds an auto-tracing record including the command and the time stamp sent from said controller in the memory in auto-tracing learning,

said control means receives a second instruction from said controller,

said control means again starts the timer on a second time base in response to the second instruction, starts auto-tracing implementation in response to the second instruction, reads out the auto-tracing record from the memory without control of said controller, and executes the command of said auto-tracing record in the auto-tracing implementation at an executing time of the second time base corresponding to the reception time indicated by the time stamp of the auto-tracing record to cause the monitor camera to conduct a monitoring operation according to the auto-tracing record without control of said controller, and

said control means determines a shortest path from a present camera position to a predetermined position specified by the command of said auto-tracing record, and said control means moves the monitor camera through the shortest path in tilt rotation and/or pan rotation to direct the monitor camera toward the predetermined position.

17. A monitor camera rotatable in panning directions and in tilting directions, comprising:

a timer;

a memory;

control means for receiving a first instruction from a controller disposed outside the monitor camera, starting the timer on a first time base in response to the first instruction, receiving from the controller both a command received in the controller and a time stamp indicative of a reception time of the command on the first time base, holding an auto-tracing record including the command and the time stamp in the memory in auto-tracing learning, receiving a second instruction from the controller, again starting the timer on a second time base in response to the second instruction, starting auto-tracing implementation in response to the second instruction, reading out the auto-tracing record from the memory, and executing the command of the auto-tracing record in the auto-tracing implementation at an executing time of the second time base corresponding to the reception time indicated by the time stamp of the auto-tracing record to cause the monitor camera to conduct a monitoring operation according to the auto-tracing record,

wherein the control means determines a shortest path from a present camera position to a predetermined position specified by the command of the auto-tracing record, and the control means controls the monitor camera to move through the shortest path in tilt rotation and/or pan rotation and to direct the monitor camera toward the predetermined position.

18. A monitor camera rotatable in panning directions and in tilting directions, comprising:

a timer;

a memory;

control means for receiving a first instruction from a controller disposed outside the monitor camera, starting the timer on a first time base in response to the first instruction, receiving from the controller both a command received in the controller and a time stamp indicative of a reception time of the command on the first time base, holding an auto-tracing record including the command and the time stamp in the memory in auto-tracing learning, receiving a second instruction from the controller, again starting the timer on a second time base in response to the second instruction, starting auto-tracing implementation in response to the second instruction, reading out the auto-tracing record from the memory, and executing the command of the auto-tracing record in the auto-tracing implementation at an executing time of the second time base corresponding to the reception time indicated by the time stamp of the auto-tracing record to cause the monitor camera to conduct a monitoring operation according to the auto-tracing record,

wherein the control means controls the monitor camera to rotate the monitor camera through 360 degrees in the panning directions and through 90 degrees or more in the tilting directions, pieces of image data obtained in the monitor camera in the monitoring operation are stored in an image memory of the monitoring camera in a photographing order, and the pieces of image data are read out from the image memory in an order reverse to the photographing order when the tilt rotation passes through zero degree.