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Focal lengths in pixels.

The horizontal and vertical focal lengths in pixels, respectively, are given by


By setting arbitrarily the values of tex2html_wrap_inline1267 and tex2html_wrap_inline1269 we obtain the constraints


which, by virtue of the equivalence tex2html_wrap_inline1271 and Eq. (30), can be rewritten as


Andrea Fusiello
Tue Feb 3 17:18:41 MET 1998