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In the first row, a is the original USAF information image, b and c images are the real and imaginary parts of the encoded USAF information data by the Fresnelet. The d is the extracted information image from the information embedded Lena image. In the second row, e, f, g, and h show the corresponding result of the first row: a–d with DDNT information image from the information embedded Lena image, respectively
