Page 114 - Introduction to Information Optics
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2.5. Image Processing with Optics 99
(a)
Fig. 2.26. (a) Images to be subtracted, (b) Subtracted image.
example of showing a time-to-spatial-signal conversion. In other words, a
one-dimensional time signal can be converted into a two-dimensional spatial
format for optical processing. If we assume the return sweep is adequately
higher as compared with the maximum frequency content of the time signal, a
two-dimensional raster-scanned format, which represents a long string of time
signals, can be written as
f(x,y)= Z /W/lv), (2.62)
where N = h/b is the number of scanned lines within the two-dimensional input
