Image processing apparatus
US4805226A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1986 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Feb 4, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/36
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for processing images which have been sampled on a rectangular grid and which have been binary digitized with one bit per pixel, each pixel being considered in relation to at least some of the eight surrounding pixels in the rectangular grid. The apparatus includes a control unit (4), a random access memory (5) for storing the pixel bits, and a feedback loop connecting the image memory output to its input via at least one feedback assembly (6) comprising shift register unit (6A, 6B), a function memory (7) and a selector (8). The shift register units comprises at least one write unit (6A) and at least one read unit (6B), with the read unit being connected to the output of the image memory and being connected to supply nine bits simultaneously to the input of the function memory. The nine bits correspond to a pixel under examination and to the eight surrounding pixels, and are changed at each shift of the shift register units. The function memory provides new values for the bit of the pixel under examination on the basis of thenine bits applied to its inputs and in accordance with a plurality of predetermined criteria. The selector receives the new values from the function …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.