Image thinning process
US4539704A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1984 |
| Grant date | Sep 3, 1985 |
| Priority date | — |
| Expiry date | Feb 21, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A process for thinning an image, comprising the steps of defining an image in terms of a plurality of discrete picture elements (pixels), convolving each horizontal string of pixels of the image with itself shifted a predetermined number of pixels, weighting each shifted position of each horizontal string, selecting certain of the pixels of the weighted horizontally convolved pixel strings which correspond to predetermined descriptors, convolving each vertical string of pixels of the image with itself shifted a predetermined number of pixels, weighting each shifted position of each vertical string, selecting certain of the pexels of the weighted vertically convolved pixel strings which correspond to predetermined descriptors, adding thee selected pixels from the weighted vertical and horizontal convolutions and the pixels of the original image, retaining those pixels which are common to the original image and the selected pixels of both the horizontal and vertical weighted convolutions, discarding those pixels which are absent from the original image, filtering those pixels which are common to the original image and the original image and only one of the selected pixels of the hori…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.