Optimizing drive schemes for multiple projector systems
Light projection systems and methods may comprise combining light from two or more projectors. Each projector may be controlled so that the combined light output of the projectors matches a target for the projected light. In some embodiments optimization is performed to generate image data and control signals for each of the projectors. Embodiments may be applied in image projecting applications, lighting applications, and 3D stereoscopic imaging.
1. An image projection system, comprising:
an image storage mechanism that stores one or more images to be presented in sequence on a projection screen;
a high dynamic range projector including a light source that only directly projects light to a first imaging element that is configured to modulate the phase of light from the light source for producing images on a projection screen with an average brightness over an entire area of the projection screen and images with a higher than average peak brightness over less than the entire area of the projection screen;
a low dynamic range projector including a light source that only projects light to a second imaging element that is different than the first imaging element that is configured to modulate the intensity of light from the first imaging element and the intensity of light from the light source in the low dynamic range projector, wherein the low dynamic range projector has a smaller dynamic range than the high dynamic range projector; and
control hardware that is configured to analyze data for each image to be projected onto the projection screen on a frame by frame basis to selectively control the low dynamic range projector to supply an approximately uniform amount of light onto the second imaging element such that some images are projected onto the projection screen using only the high dynamic range projector and some images requiring a higher than average brightness level over the entire area of the projection screen than is available from the high dynamic range projector but with a reduced dynamic range are projected on the screen using both the high dynamic range projector and the low dynamic range projector.
2. The image projection system of claim 1 , further comprising:
a camera positioned to obtain measurements of the display and to provide the measurements to the control hardware to adjust the parameters for creating an image by the high dynamic range projector and by the low dynamic range projector.
3. The image projection system of claim 1 , further comprising an iris positioned in an optical path between the low dynamic range projector and the projection screen.
4. The image projection system of claim 1 , wherein the light source of the low dynamic range projector comprises a variable intensity light source.
5. The image projection system of claim 1 , wherein the control hardware is configured to determine parameters for creating the image to be projected by the high dynamic range projector and by the low dynamic range projector based on an image fidelity model comparing the combined image with a target image.
6. The image projection system of claim 1 , wherein the control hardware is configured to determine the parameters for creating the image to be projected by the high dynamic range projector and by the low dynamic range projector based on a system constraint model.
7. The image projection system of claim 1 , wherein the control hardware is configured to determine the parameters for creating the image to be projected by the high dynamic range projector and by the low dynamic range projector based on a quality heuristics model.
8. The image projection system of claim 1 , wherein the control hardware is configured to determine a lowest luminance level present in the image to be projected and to operate the light source of the high dynamic projector at a level corresponding to the lowest luminance level in the image.
9. The image projection system of claim 1 , wherein the control hardware is configured to simulate veiling luminance, determine a lowest perceptible luminance level present in the image to be projected and operate the light source of the low dynamic range projector at a level corresponding to the lowest perceptible luminance level.