Patent ID: 6910060

Claim:
A programmable apparatus operable for spatial frequency filtering of two dimensional (2-D) signal data comprising a planar array of grounded capacitors charged in proportion to signal data values, wherein each grounded capacitor of said planar array of grounded capacitors is interconnected to other grounded capacitors by at least one switched capacitor to provide electrical connection therebetween and allow charge sharing between said planar array of said grounded capacitors through said intervening switched capacitors for the purpose of performing 2-D spatial domain filtering; and wherein each of said grounded capacitors comprising said planar array has an (x,y) coordinate and neighboring grounded capacitors disposed at (x,y) offset coordinates of (0,+1), (+1,0), (0,−1) and (−1,0) with respect to said (x,y) coordinates of each said grounded capacitor for effecting isotropic or oriented anisotropic spatial filtering; and a clock providing clock pulses operable for switching said switched capacitors for adjusting the spatial extent of the spatial frequency filtering.