Hybrid Calculation of Invariant Moments
Abstract
This thesis investigated a hybrid system for computing a position, scale, rotation invariant (PSRI) feature set. Specifically, the low order ordinary moments of a set of objects were optically calculated. This process required the production of computer generated holograms with amplitude transmittance. The detour phase hologram, a binary method, was used to produce the appropriate wavefronts of the a certain form. Each wavefront was imaged onto the object plane. The Fourier transform of the product of these two transmittances was taken and the resultant intensity pattern recorded. The center intensity value was found by using a frame grabber and the Image-Pro software. The result was the ordinary moment of the object. The moment values were digitally processed to form a PSRI feature set. The moments, both ordinary and PSRI, were tested for pattern recognition possibilities. The Euclidean distances between the objects were calculated, revealing the separation necessary for pattern recognition.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1988
- Accession Number
- ADA202594
Entities
People
- Vicky L. Robinson
Organizations
- Air Force Institute of Technology