Method of processing gradation information
US4675831A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1984 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Aug 31, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A mother matrix pattern MMP is divided into (m.times.n) child matrix patterns CMP.sub.11 -CMP.sub.mn comprising m patterns in the main scanning direction and n patterns in the sub-scanning direction, where the first foot-character denotes the position of each child matrix pattern within the mother matrix pattern in the main scanning direction and the latter foot-character denotes the position thereof in the sub-scanning direction, the mother matrix pattern being expressed by; ##EQU1## and image information corresponding to one mother matrix pattern is obtained with (m.times.n) gradation data ##EQU2## comprising ICD.sub.11 -ICD.sub.mn similarly, information of the child matrix pattern CMP.sub.ij in the mother matrix pattern specified with the gradation data ICD.sub.ij is obtained as information in the form of bit distribution for the gradation data ICD.sub.ij. In other words, the position of each of the child matrix patterns for obtaining image information in accordance with both array of one mother matrix pattern and (m.times.n) gradation data is located in a position corresponding to the position of the gradation data within the mother matrix pattern. The reproduced image is thus …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.