Automatic transparency masking
AssigneeSmartlight Ltd.
InventorsDan Inbar, Giora Teltsch, Hanan Wolf, Eran Shaffir
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Abstract
A method for viewing transparencies comprising backlighting a transparency with polarized light and viewing the transparency through a polarizer. Preferably, the polarization axis of the backlighting and the polarization axis of the polarizer are oriented at about 90 degrees to each other. The transparency is oriented so that a substantial amount of polarized backlighting passes through the transparency and the polarizer. Also disclosed are apparatus for viewing a transparency using polarized backlighting.
Claims29
A method for viewing a transparency comprising:
- backlighting said transparency with polarized light having a backlighting polarization axis;
- viewing said polarized light through a polarizer having a polarizer polarization axis;
- and
- jittering at least one of the polarizer and the backlighting polarization axes.
Apparatus for transparency viewing comprising:
- a polarized light source having a source polarization axis;
- a polarizer, having a polarizer polarization axis;
- and
- a transparency holder adapted to hold a transparency between the polarizer and the polarized light source, wherein cross-polarization between the polarization axes is imperfect, such that a quantity of light sufficient to hide Moir{acute over (e)} patterns which may be produced when viewing the transparency, leaks through the polarizer,
- wherein the polarized light source comprises:
- a light source;
- and
- a spatial masking apparatus which selectively polarizes or attenuates incident light.
Apparatus for transparency viewing comprising:
- a polarized light source having a source polarization axis;
- a polarizer, having a polarizer polarization axis,
- a transparency holder which holds a transparency between the polarizer and the polarized light source,
- means for jittering at least one of said polarized light and said polarizer in a manner effective to reduce patterns which may be produced when viewing the transparency through the polarizer.
Dependencies are inferred from the claim text.