Methods and systems for forming images of moving optical codes
US8181876B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 2008 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Dec 13, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/1491
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method aligns a second image of an object taken at a second time with a first image taken at a first time, wherein the object experiences motion relative to an imager between the first and second times. The images are formed of sets of pixels arranged horizontally and vertically in a pattern. The method operates on the pixels of the second image by performing a series of operations to affect an affine transformation without performing matrix arithmetic, preferably by table look-up. The method shifts the pixels of the second image vertically by a constant vertical offset, shifts the pixels of the second image horizontally by a constant horizontal offset, shears the second image horizontally by a skew factor, shears the second image vertically by a skew factor, scales the second image horizontally by a horizontal scale factor; and scale the second image vertically by a vertical scale factor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.