Optical correlation using diffuse objects.
A technique is discussed whereby one can optically obtain either the autocorrelation or cross-correlation for real, diffuse object arrays using a single lensless Fresnel hologram. The use of diffuse objects yields, with some loss of resolution, an increase in the effective dynamic range of the process. Theoretical analysis of the process indicates that the correlations result from a superposition of geometric images alone, obviating assumptions regarding characterization of the diffuse nature of the objects. Experimentally obtained autocorrelations and cross-correlations are presented for several binary arrays.
Bieringer
R J
RJ