Method and system for operating a camera assembly
AssigneeUTC Fire & Security Americas Corporation, Inc.
InventorKenneth McCormack
Life of this patent
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Abstract
A method and a system for video camera assembly are provided. The video camera assembly includes at least one of a pan mechanism rotatable about a pan axis and a tilt mechanism rotatable about a tilt axis. The pan mechanism includes a pan motor and a pan position encoder. The tilt mechanism includes a tilt motor and a tilt position encoder. A controller is communicatively coupled to at least one of the pan mechanism and the tilt mechanism and is configured to apply a filter to a power drive signal of at least one of the pan motor and the tilt motor based on a determined corresponding rotational speed of the at least one of the pan motor and the tilt motor with the effect of reducing steady state vibrations which degrade the visual and audible qualities of said video camera assembly.
Claims20
A video camera assembly comprising:
- a rotational drive mechanism rotatable about an axis, said rotational drive mechanism comprising a motor and a drive position encoder;
- and
- a controller communicatively coupled to the rotational drive mechanism, said controller configured to apply an adaptive filter to a drive power signal of the motor in response to a rotational speed of the rotational drive mechanism falling below a first predetermined threshold when an actual position determined by the drive encoder is near a commanded position;
- wherein the adaptive filter adjusts the drive power signal based on an error between the commanded position and the actual position, to counter a tendency of the motor to oscillate when near the commanded position.
A method of operating a video camera assembly that includes at least one of a pan mechanism and a tilt mechanism, the pan mechanism includes a pan motor and a pan axis encoder and the tilt mechanism includes a tilt motor and a tilt axis encoder, said method comprising:
- determining a rotational speed of at least one of the pan mechanism and the tilt mechanism;
- and
- filtering a drive power signal of at least one of the pan motor and the tilt motor with an adaptive filter in response to a rotational speed of the corresponding pan mechanism or tilt mechanism falling below a first predetermined threshold when an actual position determined by the corresponding pan encoder or tilt encoder is near a commanded position, the adaptive filter configured to adjust the drive power signal based on an error between the commanded position and the actual position to counter a tendency of the corresponding pan motor or tilt motor to oscillate when near the commanded position.
A video system comprising:
- a video camera assembly including a video camera and at least one of a pan mechanism and a tilt mechanism, said pan mechanism comprising a pan motor and a pan position encoder, said tilt mechanism comprising a tilt motor and a tilt position encoder;
- and
- a controller communicatively coupled to said video camera assembly, said controller is configured to:
- analyze position information from at least one of said pan position encoder and said tilt position encoder;
- determine at least one of an oscillation and an audible noise of said video camera assembly using the analyzed position information;
- generate at least one of a pan motor drive power signal and a tilt motor drive power signal using the analyzed position information;
- apply an adaptive filter based on an error between a commanded position and an actual position determined by the pan encoder or the tilt encoder, to at least one of the pan motor drive power signal and the tilt motor drive power signal in response to a rotational speed of the corresponding pan mechanism or tilt mechanism falling below a first predetermined threshold when the actual position is near the commanded position;
- and
- apply the at least one of the pan motor drive power signal and the tilt motor drive power signal to a respective motor such that at least one of the oscillation and the audible noise of said video camera assembly is reduced when the corresponding pan mechanism or tilt mechanism is near the commanded position.
Dependencies are inferred from the claim text.