In the case of digital filter, the overall brightness is down but I have not seen extreme decrease in brightness due to distance. Overall value, since it has fallen to half of FIG. 3, it found that the quantity of the thus cut-off pixel columns circularly polarizing filter fell. Although the phenomenon intensity fell, the brightness of the image photographed by the blocking of pixel columns corresponding to the circular polarization filters fell a (Fig. 5), a passive type circular widely used in a multiplexed invisible image
polarizing filter Display and yet not become a factor to attenuate the intensity, even independent of the distance.
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