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US 2010/0134630 A1Published application
Frequency and spectral domain solutions for prevention of video recording
OwnerYongshik Yooninventor
Life of this patent
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Abstract
A projection system has a projector having a varying frame rate during the course of operation. The projector having warning message frames in between actual video frames. The warning frames are not detectable to humans. A light source which emits infrared light and ultraviolet light at wavelengths and intensities detectable by movie cameras (e.g., camcorders) and undetectable to humans.
Claims23
A projection system comprising:
- a projector having a varying frame rate during the course of operation;
- and,
- at least one light source projecting light on a screen of a wavelength detectable by movie cameras and undetectable to humans.
The projection system comprising:
- a projector having a frame rate of 100 Hz or greater;
- and,
- at least one light source projecting light on a screen of a wavelength detectable by movie cameras and undetectable to humans.
Dependencies are inferred from the claim text.