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Projector with enhanced security camcorder defeat

A projector and portable technology, applied in the field of projection equipment, can solve the problems of deteriorating the illegal copy of viewing images, affecting the quality of legal copy, and deteriorating the viewing experience of the intended audience.

Inactive Publication Date: 2004-11-03
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above example for still-frame images illustrates a key issue: invisible watermarks identify but do not detrimentally affect the quality of legitimate copies, whereas visible watermarks can be distracting and degrade the viewing experience for the intended audience
[0022] ・ Illegal copying of viewing images worsened

Method used

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  • Projector with enhanced security camcorder defeat
  • Projector with enhanced security camcorder defeat
  • Projector with enhanced security camcorder defeat

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Embodiment Construction

[0042] This description is aimed in particular at components which form part of the device according to the invention or which co-operate more directly with the device according to the invention. It is to be understood that components not specifically shown or described may take forms well known to those skilled in the art.

[0043] Studies have shown that the sensitivity of the human visual system to sinusoidal intensity oscillations decreases dramatically at higher temporal frequencies. See Kelly, D.H., "Visual Responses to Time-Related Stimuli: Measures of Amplitude Sensitivity," Journal of the Optical Society of America, Vol. 51, No. 4, p. 422; and Kelly, D.H., "Visual Responses to Time-Related Stimuli: III Special Variations," Journal of the Optical Society of America, Vol. 52, No. 1, p. 89. The sensitivity of the human visual system to flash is close to the maximum range of 10-30 cycles / second, and drops rapidly above 30 cycles / second, and continues to decline with the ...

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PUM

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Abstract

A projector (10) with enhanced security camcorder defeat including a copy protection illumination system (1) for illuminating a spatial light modulator (30) comprises: a polychromatic light source (20); uniformizing optics (22) for homogenizing light from the polychromatic light source to provide a uniform illumination field; relay optics; dichroic optics; an interference modulation element (5) located at a plane in an optical path located between the polychromatic light source and the spatial light modulator; and a detection means for determining the absence of the interference modulation element.

Description

technical field [0001] The present invention relates generally to a projection apparatus that utilizes a spatial light modulator to form a color image from digital data, and more particularly to the anti-counterfeiting capability that the projection apparatus enables to achieve while maintaining the source illumination and the telecentric optical path of the modulated light . Background technique [0002] In order to be considered a suitable replacement for conventional movie projectors, a digital projection system must meet demanding requirements with respect to image quality. This is especially true for multicolor film projection systems. In order to provide a competing alternative to conventional film-quality projection, digital projectors must meet high standards of performance, providing high resolution, wide color gamut, high brightness, and frame-to-frame contrast ratios in excess of 1000:1. In addition to these requirements, steps need to be taken to secure the dat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13G03B21/00H04N5/74H04N5/913H04N9/31H04N21/41
CPCH04N2005/91335H04N2005/91342H04N2005/91371H04N2005/91314H04N5/74H04N9/31H04N5/913H04N2005/91392
Inventor D·J·内尔森
Owner EASTMAN KODAK CO