Method and apparatus for contour tracking of an image through a class of non linear filters
US7272241B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 18, 2003 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Dec 5, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10072
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for automatically detecting and tracking the contour of an image that uses a class of filters, obtained from the first order absolute central moment. The method provides the steps of filtering a starting image through the absolute central moment e(n,m) of the intensity of a pixel of the image, being n and m the coordinates of each pixel, where the absolute central moment is obtained with the following steps: determining for each n,m the local mean calculated in a neighborhood about a pixel of coordinates n,m of the starting image, thus obtaining a first filtered image; determining for each n,m the sum of the absolute differences between the intensity of a pixel of coordinates n,m of the first filtered image and the intensity of all the pixels contained in a neighborhood about a pixel of coordinates n,m of either the starting image or a second filtered image obtained from the starting image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.