Method and an apparatus for generating a video binary signal for a video image having a matrix of pixels
US5189710A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1990 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Sep 17, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/403
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In the present invention, a method and an apparatus for dynamically setting a discrimination threshold for the processing of an image is disclosed. The image is composed of a matrix of pixels with each pixel having a grey scale value. The pixels are arranged in a plurality of lines with each line having a plurality of pixels. The plurality of pixels are supplied to a line buffers memory. From the line buffers memory, the white peak line and the black minimum line are supplied to a peak and minimum detectors which determine the white peak value and the black minimum value associated with an edge. The white peak value and the black minimum values are stored. The stored white peak and black minimum values are supplied to a threshold calculator to which a user selectable input is also supplied. The output of a threshold calculator is a threshold level which is used by comparator. Another input to the comparator is the grey scale value of the pixel from the image. The output of the comparator is a binary video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.