Advanced model-based distortion-invariant filters allowing peak variations

Gregory P. House; David P. Casasent

doi:10.1117/12.205806

28 March 1995 Advanced model-based distortion-invariant filters allowing peak variations

Gregory P. House, David P. Casasent

Proceedings Volume 2490, Optical Pattern Recognition VI; (1995) https://doi.org/10.1117/12.205806
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

We consider a new detection application for distortion-invariant filters. Several new advances to the MINACE filter are considered. These include: improved object modeling (this provides scene correlation plane peaks near the specified values), improved clutter modeling (no false class training is used), a new trade-off parameter c definition (with the energy of each spectra normalized to one), use of a smaller filter size and a prime factor FFT (this reduces noise effects), zero-mean filters (these allow detection of hot and cold contrast objects), etc. We advance a new peak variance degree of freedom distortion-invariance filter (PVDDF) with many attractive new properties. These advantages include: insurance that the correlation peak values for all distorted objects are close to a given value without requiring that each object have a given correlation peak value (in practice one does not want all distorted object inputs to give the same exact correlation peak value), use of more training images N_T without an associated drop in the required threshold and thus better object modeling, and better object function energy E minimization (E reduces as N_T increase compared to other filters where E increase as N_T increases). This new filter thus achieves both better correlation peak values and better energy minimization (prior filters cannot achieve both goals) by using degrees of freedom.

Citation Download Citation

Gregory P. House and David P. Casasent "Advanced model-based distortion-invariant filters allowing peak variations", Proc. SPIE 2490, Optical Pattern Recognition VI, (28 March 1995); https://doi.org/10.1117/12.205806

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KEYWORDS

Image filtering

Databases

Optical filters

Distortion

Data modeling

3D modeling

Data centers

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