We report for the first time the use of the well-known coherence modulation of light in two-dimensional
arithmetic operations. This method, which allows several signals to be multiplexed on a single light beam,
permits parallel real-time all optical subtractions and additions. In the context of an increased need of security, a
major application of our multiplexed approach could be the optical encryption of images and multi-modalities
techniques in biometric domain. The single-channel optical architecture, which allows carrying out single and
multiple arithmetic operations, is described and more results are presented to show the effectiveness of our
technique. We have evaluated the performance of the processor in terms of noise level as a function of the
continuous optical path-difference ratio.
The latest developments in optical image processing for security, compression and cryptography require parallel real
time processing and multiplexing. In this paper, we propose the application of the well-know "coherence modulation of
light" technique for real-time encoding and decoding of signals which can be useful for optical image processing. This
method uses the coherence properties of broadband sources for encoding signals onto light beams. One major asset of
this approach, compared to other conventional optical modulation methods, is an original multiplex coding of several
signals through a single light beam. We achieve simultaneous real-time all optical image processing of analog twodimensional
signals and suggest a set of new criteria, based on mean square error, signal to noise ratio and peak to peak
signal to noise, to improve the quality of the decoding image as function of the optical path difference and the coherence
length of the source.
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