Apparatus for processing digitized images
US4853970A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1987 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Nov 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30176
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for processing a video image so as to feature the boundaries between light and dark regions of the image. The method and apparatus are applicable to a video image which is represented by an array of pixels, in which each pixel is associated with a gray scale intensity value. According to the invention a center pixel is selected along with a plurality of pixels forming a two-dimensional neighborhood of the center pixel. From the intensity values associated with the pixels of the neighborhood, a determination is made whether or not the center pixel lies in a transition region, in which the image undergoes a rapid variation between light and dark. A bit value is then assigned to the center pixel, indicating whether the center pixel is to be black or white in the processed image. The bit value is assigned according to one of two predetermined algorithms depending on whether the center pixel was determined to lie within or not to lie within a transition region. For center pixels lying in a transition region, a first algorithm assigns the bit value with respect to a virtual boundary between light and dark. For center pixels not lying in a transition region, a secon…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.