Abstract
A colored object encoding scheme in a ghost imaging (GI) system using orbital angular
momentum is investigated. A colored object is decomposed into three components and then each
component is obtained in the idler arm using a multiple grayscale encoding scheme. Afterward, we
synthesize the three reconstructed components into a colored image. The scheme is conducted and then
presented through numerical simulations and experiments. The simulation result shows that the
average peak signal-to-noise ratio (PSNR) is at 21.636 for the reconstructed color of the "Lena"
image with 255 gray scales. The experiment also shows that the PSNR is 8.082 for the reconstructed
color of the "NUPT" characters. The successful imaging of colored objects extends the further use of
the GI technique.
© 2013 Chinese Optics Letters
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