Stabilized stereographic camera system

1. A stereographic camera system comprising:

an upright support having a longitudinal axis;

a camera support coupled to a first end of the upright support, the camera support mounting first and second cameras, the first camera being movable with respect to the second camera to set an interocular distance and a convergence angle between the first and second cameras;

a ballast coupled to a second end of the upright support;

a balance mechanism for moving a movable portion of the stereographic camera system relative to the upright support in response to movement of the first camera with respect to the second camera to maintain a constant weight distribution of the stereographic camera system; and

a control system to control the balance mechanism using the following equation:

Y=m 1 X 1 +m 2 X 2 +b,

Where Y=a position of a balance motor that positions the movable portion,

m 1 =a predetermined Convergence Factor,

m 2 =a predetermined Interocular Factor,

X 1 =a position of a convergence motor that sets the convergence angle,

X 2 =a position of an interocular motor that sets the interocular distance,

b=a predetermined Offset.

2. The stereographic camera system of claim 1 wherein

the balance motor is coupled to the camera support, and

the balance motor engages the movable portion of the stereographic camera system for positioning the movable portion of the stereographic camera system relative to the camera support.

3. A stereographic camera system comprising:

an upright support having a longitudinal axis;

a camera support mounting first and second cameras, the first camera being movable with respect to the second camera to set an interocular distance and a convergence angle between the first and second cameras;

a balance mechanism between the upright support and the camera support for moving the camera support relative to the upright support in response to movement of the first camera with respect to the second camera to maintain a constant weight distribution of the stereographic camera system; and

a control system to control the balance mechanism using the following equation:

Y=m 1 X 1 +m 2 X 2 +b,

Where Y=a position of a balance motor that moves the camera support relative to the upright support,

m 1 =a predetermined Convergence Factor,

m 2 =a predetermined Interocular Factor,

X 1 =a position of a convergence motor that sets the convergence angle,

X 2 =a position of an interocular motor that sets the interocular distance,

b=a predetermined Offset.

4. The stereographic camera system of claim 3 wherein a first end of the upright support attaches to the balance mechanism.

5. The stereographic camera system of claim 4 where a second end of the upright support attaches to a ballast.

6. The stereographic camera system of claim 4 wherein the balance mechanism comprises:

a translation plate moveable relative to the camera support,

wherein the balance motor is coupled to the camera support, and the balance motor engages the translation plate for positioning the translation plate relative to the camera support.

7. The stereographic camera system of claim 6 , further comprising:

a mounting plate attached to the first end of the upright support, the mounting plate attachable to the translation plate in a plurality of positions in a forward-backward direction.

8. The stereographic camera system of claim 7 wherein the balance mechanism further comprises:

at least one rail receiving channel and at least one rail disposed between the translation plate and the camera support, each rail receiving channel receiving a rail for lateral movement of the translation plate with respect to the camera support.

9. A stereographic camera comprising:

a camera support mounting first and second cameras, the first camera being movable laterally with respect to the second camera to set an interocular distance and a convergence angle between the first and second cameras;

a mounting plate for receiving a first end of an upright support of a movable camera support device;

a balance mechanism between the mounting plate and the camera support for moving the camera support and the mounting plate relative to each other in response to movement of the first camera with respect to the second camera to maintain a center of gravity of the stereographic camera in a fixed position with respect to the mounting plate; and

a control system to control the balance mechanism using the following equation:

Y=m 1 X 1 +m 2 X 2 +b,

Where Y=a position of a balance motor that moves the camera support relative to the mounting plate,

m 1 =a predetermined Convergence Factor,

m 2 =a predetermined Interocular Factor,

X 1 =a position of a convergence motor that sets the convergence angle,

X 2 =a position of an interocular motor that sets the interocular distance,

b=a predetermined Offset.

10. The stereographic camera of claim 9 wherein the balance mechanism comprises:

a translation plate moveable relative to the camera support; and

a motor coupled to the camera support, the motor engaging the translation plate for positioning the translation plate relative to the camera support.

11. The stereographic camera of claim 10 wherein the mounting plate is attachable to the translation plate in a plurality of positions in a forward-backward direction.

12. The stereographic camera of claim 10 wherein the balance mechanism further comprises:

at least one rail receiving channel and at least one rail disposed between the translation plate and the camera support, each rail receiving channel receiving a rail for lateral movement of the translation plate with respect to the camera support.

13. A method for compensating for changes in weight distribution of a stereographic camera system, wherein the stereographic camera system comprises an upright support having a longitudinal axis, a camera support coupled to a first end of the upright support, the camera support mounting first and second cameras, the first camera being movable with respect to the second camera, a ballast coupled to a second end of the upright support, and a balance mechanism for moving a movable portion of the stereographic camera system relative to the upright support, the method comprising:

automatically moving the movable portion of the stereographic camera system relative to the upright support in response to movement of the first camera with respect to the second camera to maintain a constant weight distribution of the stereographic camera system using the following equation:

Y=m 1 X 1 +m 2 X 2 +b,

Where Y=a position of a balance motor that moves the movable portion,

m 1 =a predetermined Convergence Factor,

m 2 =a predetermined Interocular Factor,

X 1 =a position of a convergence motor that sets a convergence angle of one camera relative to the other camera,

X 2 =a position of an interocular motor that sets an interocular distance of one camera relative to the other camera,

b=a predetermined Offset.

14. The method of claim 13 , further comprising:

choosing three calibration positions, a, b, and c corresponding to convergence motor positions X 1a , X 1b , and X 1c , and interocular motor positions X 2a , X 2b , and X 2c ;

setting the convergence motor and the interocular motor to positions X 1a and X 2a respectively and manually controlling the balance motor to move the movable portion of the stereographic camera system to a position Y a that balances the system;

setting the convergence motor and the interocular motor to positions X 1b and X 2b respectively and manually controlling the balance motor to move the movable portion of the stereographic camera system to a position Y b that balances the system;

setting the convergence motor and the interocular motor to positions X 1c and X 2c respectively and manually controlling the balance motor to move the movable portion of the stereographic camera system to a position Y c that balances the system; and

determining m 1 , m 2 , and b from the values X 1a , X 1b , X 1c X 2a , X 2b , X 2c Y a , Y b , and Y c .