Apparatus and method for characterizing, encoding, storing, and searching images by shape
US6678411B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2000 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Mar 27, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/92
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical image characterizer 10 detects light energy as discrete angular orientations of a slit in a rotating spatial filter positioned at the focal plane of a Fourier transform lens, where a Fourier transform pattern of spatial frequencies of an image are formed. Detection of light energy with a small array (e.g., 16×16) photodetector is enhanced by splitting the beam containing the filtered light energy pattern and projecting it onto two photodetector arrays in offset, virtual juxtaposed relation to each other. Detected light intensities I at discrete angular orientations R are stored in RIXel data arrays with or without searchable flags X, such as distortion factors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.