Claims
- 1. A programmable apparatus operable for spatial frequency filtering of one and two dimensional signal data, said programmable apparatus comprising a planar array of grounded capacitors charged in proportion to signal data values, wherein each grounded capacitor comprising said planar array of grounded capacitors is interconnected to other grounded capacitors by at least one switched capacitor.
- 2. The apparatus in accordance with claim 1 wherein each grounded capacitor comprising said planar array of grounded capacitors is electrically connected to neighboring grounded capacitors by a switched capacitor, said neighboring grounded capacitors disposed at (x,y) offset coordinates of (0, +1), (+1, 0), (0, −1), (−1, 0) with respect to (x,y) coordinates of said each grounded capacitor.
- 3. The apparatus of claim 2 wherein each grounded capacitor is further electrically connected by a switched capacitor to neighboring grounded capacitors at (x,y) coordinate offsets including but not limited to (+1, +2), (+2, +1), (+2, −1), (+1, −2), (−1, −2), (−2, −1), (−2, +1), and (−1, +2) with respect to (x,y) said each grounded capacitor.
- 4. The apparatus of claim 2 wherein each grounded capacitor is further electrically connected by a switched capacitor to neighboring grounded capacitors at (x,y) coordinate offsets including but not limited to (+1, +1), (+1, −1), (−1, −1), and (−1, +1) with respect to (x,y) coordinates of said each grounded capacitor.
- 5. The apparatus of claim 1 further comprising a clock operable for providing clock pulses for switching said switched capacitors.
- 6. The apparatus of claim 1 further comprising a reference capacitor operable for differencing filtered signal data from said signal data.
- 7. The apparatus of claim 6 further comprising means for adjusting said clock pulses thereby providing means for adjusting the selectivity of the spatial length scale and/or the extent of spatial anisotropy and spatial orientation of said anisotropy of the spatial frequency filtering.
- 8. The apparatus of claim 6 wherein said one and two dimensional signal data comprises a data array having at least one row of signal data and wherein said clock provides independent switched capacitor control of a row of signal data for implementing independent one-dimensional spatial filters for performing computations including, but not limited to, wavelet scalogram computations.
- 9. The apparatus of claim 1 further comprising means for changing operability of said apparatus from a low pass spatial frequency filter to a high pass spatial frequency filter.
- 10. An apparatus operable for spatial and/or temporal processing of time dependant array data comprising a plurality of analog signal processors including a thin film spatial frequency filter and/or a switched capacitor spatial frequency filter.
- 11. The apparatus of claim 10 wherein said plurality of analog signal processors are configured in a parallel arrangement with individual multiplicative weights operable for selectively performing high pass, band pass and low pass spatial frequency and temporal filtering to achieve filtering basis function control.
- 12. A method for spatial frequency filtering of one and two dimensional signal data from a one or two dimensional source of said signal data comprising the step of conducting said signal data from said source of said signal data to a corresponding set of grounded capacitors in a spatial frequency filtering apparatus in accordance with claim 1.
- 13. The method of claim 12 further comprising a spatial shifting operation for the computation of non-symmetric convolution kernels.
- 14. The method of claim 13 further comprising a method for approximating a spatial derivative including mixed partial derivatives through finite difference approximations based on the combination of weighted sums of spatially shifted images using a thin film analog image processor or a switched capacitor spatial frequency filter.
- 15. The method of claim 12 further comprising a step that includes the use of the difference of two spatially oriented anisotropic spatial filters to remove fixed pattern noise.
- 16. The method of claim 12 further comprising a step that performs the computations for scene-based adaptive non-uniformity correction of video with fixed pattern noise.
- 17. The method of claim 12 that further provides temporal frequency filtering of one and two dimensional spatially filtered signal data from a one or two dimensional source of said signal data comprising the step of conducting said signal data from said source of said signal data to a set of analog band pass temporal filters in a spatial-temporal frequency filtering apparatus.
- 18. The method of claim 17 further comprising a step that includes the computation of an optical flow field using a thin film spatial frequency filter or a switched capacitor spatial frequency filter.
- 19. The method of claim 17 further comprising a step that combines spatial and temporal filtering to perform convolution operations including but not limited to a continuous wavelet transform.
- 20. The method of claim 17 further comprising a step that combines spatially and temporally filtered data to compute non-linear motion energy.
- 21. The method of claim 20 further comprising the use of multiple independent filter banks for providing multi-representational motion segmentation.
- 22. The method of claim 20 further comprising a step that uses dynamic programming for target detection.
- 23. The method of claim 20 further comprising a step that employs spatial and temporal filtering determined rotational dynamics to resolve closely spaced objects and/or identify sub-pixel targets and target orientation.
STATEMENT REGARDING FEDERALLY SPONSERED RESEARCH OR DEVELOPMENT
[0001] This invention was made, in part, with Government support under contract DASG60-99-C-0017 awarded by U.S. Army Space and Missile Defense Command. The Government has certain rights in the invention.
Provisional Applications (1)
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Number |
Date |
Country |
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60292219 |
May 2001 |
US |