Method and apparatus for film anti-piracy
First Claim
Patent Images
1. A method for distorting a recording of projected images, the recording having a frame frequency, the method comprising the steps of:
- without varying the frame frequency of the projector, imposing an interference on the projected images at a frame rate frequency that renders the interference imperceptible to a human viewer;
wherein a difference between the interference frame rate frequency and the recording frame frequency is perceptible to a human;
wherein the interference is characterized by a plurality of parameters, the parameters being selected from the group comprising duty cycle, frequency, amplitude, presentation order and wavelength; and
varying at least one of the parameters.
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Abstract
A method and apparatus is disclosed for introducing alterations or distortions in projected images. The distortions on the projected image are imperceptible to a human viewer. The distortions are recorded on recording devices and observable upon viewing the recorded images.
34 Citations
16 Claims
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1. A method for distorting a recording of projected images, the recording having a frame frequency, the method comprising the steps of:
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without varying the frame frequency of the projector, imposing an interference on the projected images at a frame rate frequency that renders the interference imperceptible to a human viewer; wherein a difference between the interference frame rate frequency and the recording frame frequency is perceptible to a human; wherein the interference is characterized by a plurality of parameters, the parameters being selected from the group comprising duty cycle, frequency, amplitude, presentation order and wavelength; and varying at least one of the parameters. - View Dependent Claims (2, 3, 4)
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5. A method for distorting a recording of projected images, the recording having a frame frequency, the method comprising the steps of:
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without varying the frame frequency of the projector, imposing an interference on the projected images at a frame rate frequency that renders the interference imperceptible to a human viewer; wherein a difference between the interference frame rate frequency and the recording frame frequency is perceptible to a human, and wherein the imposing step includes the steps of; scanning a white light strip; separating the white light strip into color light strips; separating spatial entities into component colors; and modulating the component colors.
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6. A method for distorting a recording of projected images, the recording having a frame frequency, the method comprising the steps of:
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without varying the frame frequency of the projector, imposing an interference on the projected images at a frame rate frequency that renders the interference imperceptible to a human viewer; wherein a difference between the interference frame rate frequency and the recording frame frequency is perceptible to a human; and separating the projected images into a plurality of colors, wherein the imposing step includes the further step of modulating at least one of the plurality of colors by changing a time relationship of the at least one color with respect to at least one other of the plurality of colors. - View Dependent Claims (7)
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8. A method for operating a motion picture projector having a projector frame frequency, comprising the steps of:
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without varying the projector frame frequency, determining a recording device frame frequency; and blanking a projected image at a humanly imperceptible blanking frame rate frequency, wherein a difference between the frame frequency and the blanking frame rate frequency is a humanly perceptible frame frequency, wherein the blanking of the projected image is characterized by a plurality of parameters, the parameters being selected from the group comprising duty cycle, frequency, amplitude, presentation order and wavelength; and varying at least one of the parameters.
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9. A projection system for distorting a recording of projected images, the recording having a frame frequency, the system comprising:
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an interfering element including a separator for separating image data into a plurality of colors; and a controller coupled to the interfering element, wherein the controller, without varying the projector image frame frequency, causes the interfering element to impose an alteration on the projected images at a humanly imperceptible frame rate, wherein a playback of a recording of the projected images displays humanly perceptible alterations, and wherein the controller is further operable to cause the interfering element to vary a plurality of parameters, at least one of the plurality of parameters being selected from the group comprising duty cycle, frequency, amplitude, brightness, intensity, presentation order and wavelength. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A projection system for distorting a recording of projected images, the recording having a frame frequency, the system comprising:
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an interfering element including a separator for separating image data into a plurality of colors; and a controller coupled to the interfering element, wherein the controller, without varying the projector image frame frequency, causes the interfering element to impose an alteration on the projected images at a humanly imperceptible frame rate, wherein a playback of a recording of the projected images displays humanly perceptible alterations, a white light source for providing white light; and a detector for determining spatial entities for color modulation, the interfering element including; a color separator for color separating the white light and the spatial entities for color modulation into component colors; a time multiplexer for varying parameters of the component colors of the spatial entities for color modulation; a processor for defining an order of coarse bits and of fine bits for at least one of the component colors of the spatial entities for color modulation; a modulator for modulating the white light component colors and the component colors of the spatial entities for color modulation, the modulator providing modulated component colors; and a combiner for combining the modulated component colors. - View Dependent Claims (16)
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Specification