Video display of indicia
First Claim
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1. Video communication apparatus comprising:
- a first diffusing screen comprising a layer of a transparent material in contact with a layer of a diffusing material,said diffusing material having a first surface in contact with said transparent material and a second surface spaced from said transparent material by the thickness of said diffusing material,said second surface forming a receiving surface that is substantially smooth and of a quality for accepting indicia thereupon,said first surface of said diffusing material in contact with said transparent material forming a transmitting surface; and
a video camera positioned to provide a first video signal representative of images on said transmitting surface,said video camera separated from said second surface by said transparent material and said diffusing material,wherein said diffusing material is thin diffusing material bonded to one side of said transparent material,the thickness of said diffusing material being great enough to approximate the decoupling of a lambertian diffuser, but not so thick as to degrade the spatial resolution of the indicia.
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Abstract
Video communication apparatus includes a first diffusing screen comprising a layer of a transparent material in contact with a layer of a diffusing material such that the surface of the diffusing material not in contact with the transparent material forms a receiving surface that is substantially smooth and of a quality for accepting indicia, and the surface of the diffusing material in contact with the transparent material forms a transmitting surface. A video camera is positioned to provide a first video signal representative of images on the transmitting surface.
16 Citations
19 Claims
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1. Video communication apparatus comprising:
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a first diffusing screen comprising a layer of a transparent material in contact with a layer of a diffusing material, said diffusing material having a first surface in contact with said transparent material and a second surface spaced from said transparent material by the thickness of said diffusing material, said second surface forming a receiving surface that is substantially smooth and of a quality for accepting indicia thereupon, said first surface of said diffusing material in contact with said transparent material forming a transmitting surface; and a video camera positioned to provide a first video signal representative of images on said transmitting surface, said video camera separated from said second surface by said transparent material and said diffusing material, wherein said diffusing material is thin diffusing material bonded to one side of said transparent material, the thickness of said diffusing material being great enough to approximate the decoupling of a lambertian diffuser, but not so thick as to degrade the spatial resolution of the indicia. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Communication network apparatus comprising:
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(1) a plurality of stations, each station comprising; a diffusing screen comprising a layer of a transparent material in contact with a layer of a diffusing material, said diffusing material having a first surface in contact with said transparent material and a second surface spaced from said transparent material by the thickness of said diffusing material, said second surface forming a receiving surface that is substantially smooth and of a quality for accepting indicia thereupon, said first surface of said diffusing material in contact with said transparent material forming a transmitting surface; a video camera positioned to provide a video signal representative of images on said transmitting surface; said video camera separated from said second surface by said transparent material and said diffusing material; wherein said diffusing material is thin diffusing material bonded to one side of said transparent material, the thickness of said diffusing material being great enough to approximate the decoupling of a lambertian diffuser but not so thick as to degrade spatial resolution of the indicia, and (2) a multiplexer at one location for combining said video signals to provide a combined video signal, which is then transmitted to all other stations. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification