Scrambled(Encrypted) Image
By means of special software tools : individual information such as the passport number, or the holder's name, is embedded in the photograph of the holder or static information such as a country’s name, is embedded in the background printing of travel documents. This information is invisible to the human eye, as it is printed in "scrambled" format and can only be seen using a decoder lens (a special viewer) or laboratory equipment (scanner or camera with a computer with image processing software). Not to be confused with latent image, nor with tilting effect.
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By means of special software tools : individual information such as the passport number, or the holder's name, is embedded in the photograph of the holder or static information such as a country’s name, is embedded in the background printing of travel documents. This information is invisible to the human eye, as it is printed in "scrambled" format and can only be seen using a decoder lens (a special viewer) or laboratory equipment (scanner or camera with a computer with image processing software). Not to be confused with latent image, nor with tilting effect.
Source : Click Here
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