System and method for controlling the field of view of a camera

• US 5,963,250 A
• Filed: 10/20/1995
• Issued: 10/05/1999
• Est. Priority Date: 10/20/1995
• Status: Expired due to Term

• Current Assignee: Gvbb Holdings SARL (Vislink Technologies, Inc.)
• Original Assignee: ParkerVision, Inc.
• Inventors: Parker, Jeffrey L., Marvin, Philip A.
• Primary Examiner(s): Garber, Wendy
• Assistant Examiner(s): Vu, Ngoc-Yen, VU, NGOC YEN T
• Application Number:
  US08/546,372
• Time in Patent Office: 1,446 Days
• Field of Search: 348/7, 348/12, 348/13, 348/14, 348/15, 348/20, 348/135, 348/139, 348/141, 348/142, 348/143, 348/159, 348/169, 348/211, 348/212, 348/213, 348/218
• US Class Current: 348/211.6
• CPC Class Codes: H04N 23/661 Transmitting camera control signals through networks, e.g. control via the Internet
• 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

Abstract

A system and method for control of the field of view of one or more cameras for providing that one or more subjects are to be in a single field of view ("share view") wherein the system will automatically calculate the values for the various field of view variables to provide the appropriate camera operation. Various computer-controlled programs are included to operate the system including programs for the integration of camera operation and automatic tracking of the subjects present. The system is designed for video and it can automatically add and remove subjects from a share view.

Claims

1. A method of controlling the creation of the field of view of one camera being controlled by an automatic control system comprising the steps of:

A. selecting values for one or more field of view variables from the following list of variables that define the field of view of the one camera to create a field of view unique to each subject;

a. field of view position variables,

b. field of view perspective variables,

c. camera imaging variables, and

d. automatic control system variables;

B. defining share view as the field of view of the one camera other than the field of view unique to each subject created by combining respective position coordinates of each of at least two subjects and field of view variables associated with each of at least two subjects;

C. issuing a command to the automatic control system requesting a first share view for the at least two subjects identifiable as such by the automatic control system; and

D. controlling the one camera by the automatic control system to provide for the field of view requested in step C in accordance with the values selected in step A.

2. The method of claim 1 wherein step B includes the step of:

E. establishing a location preset for each subject in terms of the position coordinates of each of at least two subjects.

3. The method of claim 2 further including the step of:

F. issuing a command by either of the at least two subjects for controlling the camera by the automatic control system to provide the field of view of the camera to be the established location preset of the subject that issued such command.

4. The method of claim 3 further including the steps of:

G. issuing a command from either of the at least two subjects requesting a second share view for the at least two subjects;

H. recalling the location preset for the subject that did not issue such command;

I. determining relative positions of the location presets for the at least two subjects;

J. calculating the values of the field of view variables of the camera necessary to create the second share view; and

K. controlling the field of view of the camera to provide for the second share view.

5. The method of claim 4 wherein step J includes the step of:

L. calculating a respective angle of view of the camera for each of the location presets.

6. The method of claim 4 further including the steps of:

L. issuing a command from a third subject requesting a third share view for the at least two and the third subjects;

M. recalling the location presets for each of the subjects to be in the third share view;

N. determining the relative positions of the location presets for each of the subjects of step L;

O. calculating the values of the field of view variables of the camera necessary to create the requested third share view; and

P. controlling the field of view of the camera to provide the requested third share view.

7. The method of claim 6 further including the steps of:

Q. issuing a command by one of the subjects of step L requesting to be removed from the third share view;

R. creating a fourth share view for the two subjects of step L that did not request removal from the third share view; and

S. controlling the field of view of the camera to provide for a fourth share view for the two subjects of step R.

8. The method of claim 1 further including the steps of:

E. issuing a command from one of at least two subjects that is identifiable by the automatic control system as requesting a second share view for the at least two subjects;

F. creating the second share view; and

G. controlling the field of view of the camera by the automatic control system to provide the second share view.

9. The method of claim 8 wherein step F includes the steps of:

H. determining the respective position coordinates of each of the at least two subjects;

I. providing values for the variables of step B to create another field of view of the camera that includes the at least two subjects; and

J. combining the position coordinates of step H and the values of step I to provide that the at least subjects are in the another field of view of the camera.

10. The method of claim 9 further including the steps of:

K. issuing another command from a third subject requesting a share view for the at least two and the third subjects;

L. creating a third share view; and

M. controlling the field of view of the camera by the automatic control system to provide the third share view.

11. The method of claim 9 further comprising the step of:

K. establishing a location preset for each subject in terms of the position coordinates of each of at least two subjects; and

wherein step H includes the step of;

L. recalling the location presets for each subject.

12. The method of claim 2 further including the steps of:

F. recalling the location presets for each of the at least two subjects;

G. determining relative positions of the location presets for each of the at least two subjects;

H. Calculating values of the field of view variables necessary to create a second field of view that includes all subjects;

I. combining the positions determined in step G and the values of step H to define a group view of all the subjects; and

J. controlling the field of view of the camera by the automatic control system to provide the group view defined in step I.

13. The method of claim 12 wherein step I includes the step of:

K. determining whether the field of view of the camera required for group view exceeds the field of view attainable for the camera.

14. The method of claim 12 wherein step H includes the steps of:

K. defining group angle as representing from the position of the camera the angle of view of the camera in at least one plane required to include all subjects in the field of view;

L. determining from the relative position of each subject an angle in a horizontal plane from the position of the camera between the location presets of the subjects furthest to the right and left of a reference established by the automatic control system;

M. determining from the relative position of each subject an angle in a vertical plane from the position of the camera between the location presets of the subjects uppermost and bottommost of a reference established by the automatic control system;

N. determining a horizontal group angle from the angle determined in step L; and

O. determining a vertical group angle from the angle determined in step M.

15. The method of claim 14 wherein step K includes the steps of:

P. determining whether the horizontal group angle is greater than a maximum angle of view of the camera; and

Q. determining whether the vertical group angle is greater than a maximum angle of view of the camera.

16. The method of claim 12 further including the steps of:

K. issuing by a subject that is in the group view a command identifiable by the automatic control system as requesting a second share view for the respective subject; and

L. operating the camera by the automatic control system to provide that the field of view of the camera is the location preset of the respective subject.

17. The method of claim 16 further including the steps of:

M. issuing by another subject that is in the group view a command identifiable by the automatic control system as requesting a third share view for the another subject and the subject of step K;

N. creating by the automatic control system the third share view for the two subjects of step M; and

O. controlling the camera by the automatic control system to provide for the third share view.

18. The method of claim 17 further including the steps of:

P. issuing by one of the subjects a command identifiable by the automatic control system as requesting that the respective subject be removed from the third share view;

Q. creating by the automatic control system a fourth share view without the one subject remaining in the field of view of the camera; and

R. controlling the camera field of view by the automatic control system to provide for the fourth share view.

19. The method of claim 18 further including the step of:

S. determining the time that the camera is controlled to provide the fourth share view; and

T. controlling the camera field of view by the automatic control system to provide group view in accord with step J if the time determined in step S is greater than a predetermined time as established by the automatic control system.

20. The method of claim 19 wherein step S includes the step of:

U. maintaining the camera field of view at the position of step R if the time determined in step S is not greater than the predetermined time.

21. A method of controlling the field of view of one camera being controlled by an automatic control system comprising the steps of:

A. selecting values for one or more field of view variables from the following list of variables that define the field of view of a camera to create at least two unique fields of view;

a. field of view position variables,

b. field of view perspective variables,

c. camera imaging variables, and

d. automatic control system variables;

B. defining share view as created by combining at least two unique fields of view of a camera, each being other than the fields of view unique to each subject, each having at least one unique position coordinate and both coordinates being in a single plane;

C. requesting a share view identifiable as such by the automatic control system; and

D. controlling the field of view of the camera by the automatic control system to provide for the share view requested in step C in accordance with the values selected in step A.

22. The method of claim 21 wherein the at least two unique field of views include respective targets at different coordinates.

23. The method of claim 21 wherein the at least two unique field of views include respective subjects at different coordinates.

24. The method of claim 21 further including the step of:

E. issuing a command by either of the subjects for the controlling of step D.

25. The method of claim 21 further includes the step of:

E. establishing a location preset for each of the at least two field of views of the camera.

26. The method of claim 25 further including the step of:

F. issuing a command to the automatic control system to provide the field of view of the camera to be the location preset of either the at least two field of views of the camera.