Partially space invariant operations

So far as we know, these are the only references to this useful concept. Objects that are only locally stable need this sort of treatment and cannot be treated well by global methods.

• "Partially‑Space‑Variant Pattern Recognition," Opt. Comm., Vol. 39, pg. 228 (1981) H.J. Caulfield
• “Fractional correlator with real-time control of the space-invariance property,” Applied Optics, Vol. 36, No. 36, (December 1997), pp. 2370, D. Mendlovic, H. J. Caulfield.
• “Localized, partially space-invariant filtering,” Applied Optics, Vol. 36, No. 36, (December 1997), pp. 1086, D. Mendlovic, H. J. Caulfield