Closed loop driving of a highlighter type projector
AssigneeBarco N.V.
InventorsDirk MAES, Peter GERETS, Gerwin DAMBERG
Life of this patent
Estimating the term…
Abstract
A method for driving a projection system and a projection system including a phase modulator and at least one amplitude modulator. The phase modulator is configured to generate a highlight image incident on the amplitude modulator, the projector system further includes at least one image sensor configured to receive at least a portion of an illumination pattern substantially equivalent to the illumination pattern incident on the amplitude modulator, and the image sensor is being used to provide feedback to the controller of the projection system to improve the highlights projected by the projection system.
Claims21
1-44. (canceled)
A method of driving a projector system comprising a light source, a phase modulator and at least one amplitude modulator, the phase modulator being configured to generate a highlight image incident on the amplitude modulator, the projector system further comprising at least one image sensor configured to receive at least a portion of an illumination pattern substantially equivalent to an illumination pattern incident on the amplitude modulator, the method comprising the steps of:
- 1) receiving an input image,
- 2) generating a target highlight image, a target image and light source power control signals from the input image,
- a) generating a phase pattern for driving the phase modulator from the target highlight image,
- b) generating a predicted illumination profile image from the target highlight image,
- c) generating an amplitude pattern for driving the amplitude modulator from the predicted illumination profile image and the target image,
- 3) receiving an image from the image sensor to provide feedback to at least one of the method steps 2), 2b), 2c) for driving the projector system.
A method for monitoring the light levels provided by at least one laser source in a projector system, said at least one laser source being driven by power control signals, the projector system comprising a phase modulator and at least one amplitude modulator, the phase modulator being configured to generate a highlight image incident on the amplitude modulator, the projector system further comprising at least one image sensor configured to receive at least a portion of an illumination pattern substantially equivalent to an illumination pattern incident on the amplitude modulator, the image sensor comprising at least one of an active area and an addressable area, the method comprising the steps of:
- comparing the light intensity within at least one of the active area and the addressable area with a threshold,
- reducing the power or shutting down the laser source with the power control signals when the measured light intensity is higher than the threshold.
A projector system comprising:
- a phase modulator and at least one amplitude modulator,
- the phase modulator being configured to generate a highlight image incident on the amplitude modulator,
- the projector system further comprising at least one image sensor configured to receive at least a portion of an illumination pattern substantially equivalent to an illumination pattern incident on the amplitude modulator, the phase modulator, amplitude modulator and image sensor being controlled by a driver, and further comprising a feedback loop for providing the output of the image sensor to the driver.
Dependencies are inferred from the claim text.