Programmable light beam shape altering device using programmable micromirrors

• US 5,953,152 A
• Filed: 09/23/1997
• Issued: 09/14/1999
• Est. Priority Date: 02/07/1996
• Status: Expired due to Term

• Current Assignee: Production Resource Group LLC
• Original Assignee: Light and Sound Design Limited
• Inventors: Hewlett, William E.
• Primary Examiner(s): Epps, Georgia
• Assistant Examiner(s): BURKE, MARGARET A
• Application Number:
  US08/938,381
• Time in Patent Office: 721 Days
• Field of Search: 359/298, 359/223, 359/850, 359/896, 359/900, 353/28, 353/62, 353/89, 353/121
• US Class Current: 359/298
• CPC Class Codes: F21S 10/007 using rotating transparent or colored disks, e.g. gobo wheels
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: G02B 26/0833 the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD G02B26/0825 takes precedence; micromechanical devices in general B81B
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: H04N 5/7458 the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]
• CPC Class Codes: Y10S 359/90 Methods

Abstract

A digital micromirror device ("DMD") is used to alter the shape of light that is projected onto a stage. The DMD selectively reflects some light, thereby shaping the light that is projected onto the stage. The control for the alteration is controlled by an image. That image can be processed, thereby carrying out image processing effects on the shape of the light that is displayed. One preferred application follows the shape of the performer and illuminates the performer using a shape that adaptively in follows the performer'"'"'s image. This results in a shadowless follow spot.

Claims

1. A method of shaping a light beam for a stage lighting device, comprising:

forming a light beam of a first shape;

defining a second shape as an object of morphing; and

morphing the shape of the light beam from the first shape to the second shape.

2. A method as in claim 1 wherein the shape of said light beam is changed from said first shape to said second shape through intermediate shapes between said first shape and said second shape at defined time slices between a beginning time of the morphing and an ending time of the morphing.

3. A method as in claim 1 wherein said forming and morphing comprises passing the light beam through an array of selectively alterable reflection devices, some elements of the array selectively reflecting parts of the light beam.

4. A stage lighting spot light apparatus, comprising:

a first element which determines a shape of a performer on the stage and produces a digital representation indicative thereof;

a memory, storing said digital representation;

a light shape altering device, in a path of a beam of light and connected to receive a signal from said memory, said light shape altering device automatically altering a shape of said beam of light to substantially conform with contents of said digital representation in said memory.

5. An apparatus as in claim 4, wherein said first element includes an image acquiring camera.

6. An apparatus as in claim 5 wherein said light shape altering device includes a plurality of movable mirrors, which are controlled to a first position to pass light away from the stage, and a second position to pass light to the stage.

7. An apparatus as in claim 4, wherein said first element includes a camera and a digitizing element which digitizes an output of said camera.

8. An apparatus as in claim 4 wherein said first element comprises an image correlating processor, correlating over an image of the stage to determine a shape of the performer in the image, and which converts the shape of the performer to the digital representation indicative thereof, and stores said digital representation in said memory.

9. An apparatus as in claim 8 wherein said memory is a video RAM.

10. An apparatus as in claim 8 further comprising a tracking element which tracks a position of the performer, and further comprising a movable light which moves to follow the position of the performer tracked by said tracking element.

11. An apparatus as in claim 10 wherein said first element further includes a camera, and wherein said camera has a common axis of rotation with said movable light.

12. An apparatus as in claim 4 wherein said digital representation in said memory is continuously changing as the performer moves and the performer'"'"'s shape changes, and said light shape altering device continuously conforms said shape of said beam of light to conform with said contents of said digital representation in said memory.

13. An apparatus as in claim 4 wherein said light shape altering device is electrically controllable to alter the shape of the beam of light.

14. A method of lighting a performer on a stage, comprising:

obtaining an image of a portion of the stage which includes the performer;

processing said image to automatically determine a shape of the performer in said image;

forming a digital representation of said shape; and

using said digital representation to automatically form a light beam having the shape of the performer, to thereby project a light beam in the shape of the performer.

15. A method as in claim 14 wherein said processing comprises correlating the performer'"'"'s shape over the image to automatically find the performer'"'"'s shape.

16. A method as in claim 14 wherein said using comprises selectively reflecting light away from the stage.

17. A method of illuminating a stage performer, comprising:

obtaining information indicative of a shape of the performer on the stage within a field of view of a light beam projecting device;

adjusting said information to shrink an outline of the shape and to form modified information; and

using said modified information to alter a shape of light being projected to thereby project a beam of light having the shrunk shape of the performer.

18. A method as in claim 17 wherein said altering the shape of light comprises:

providing an array of movable mirrors which can move in response to a signal applied thereto;

processing said information to form said information into an array of signals to be mapped to said array of movable mirrors; and

said micromirrors being responsive to said array of signal to control the states thereof and thereby selectively reflect light to the stage and reflect light away from the stage, depending on a state of an applied signal.

19. A method as in claim 17 wherein said obtaining comprises obtaining an image of a scene and processing said scene to automatically determine the shape of the performer therewithin;

and

translating said shape to digital information indicative thereof.

20. A method as in claim 17 wherein said adjusting adjusts said information to shrink the outline of the shape by an amount effective to prevent a projected light from forming a shadow around the performer.

21. A method of forming a shadowless spot light, comprising:

analyzing an image of a stage including the performer thereon to determine a shape of the performer on the stage; and

automatically adjusting a shape of light projected onto the stage to conform with said shape of the performer.

22. A method as in claim 21 wherein said adjusting is carried out continuously to continuously conform with the determined shape of the performer as the performer moves.

23. Method as in claim 21 further comprising shrinking the shape of the performer prior to adjusting the shape of light.

24. A method as in claim 22 wherein said shrinking adjusts the shape of light to shrink the outline of the shape by an amount effective to avoid a projected light beam from forming a shadow around the contour of the performer.