An optical parallel architecture for the random-iteration algorithm to decode a fractal image by use of iterated-function system (IFS) codes is proposed. The code value is first converted into transmittance in film or a spatial light modulator in the optical part of the system. With an optical-to-electrical converter, electrical-to-optical converter, and some electronic circuits for addition and delay, we can perform the contractive affine transformation (CAT) denoted in IFS codes. In the proposed decoding architecture all CAT’s generate points (image pixels) in parallel, and these points then are joined for display purposes. Therefore the decoding speed is improved greatly compared with existing serial-decoding architectures. In addition, an error and stability analysis that considers nonperfect elements is presented for the proposed optical system. Finally, simulation results are given to validate the proposed architecture.
© 1998 Optical Society of America
Original Manuscript: October 21, 1996
Revised Manuscript: June 16, 1997
Published: March 10, 1998
Hsuan T. Chang and Chung J. Kuo, "Random-iteration algorithm-based optical parallel architecture for fractal-image decoding by use of iterated-function system codes," Appl. Opt. 37, 1310-1318 (1998)