Method and arrangement for the representation of a halftone image by use of a detection-adapted grid
US4651228A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1985 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | Oct 3, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method and arrangement for the representation of a halftone image upon employment of a detection-adapted grid, the halftone image formed of intensity stages is generated by picture elements of identical size situated at prescribed grid positions. A given plurality of grid positions is combined to form an image spot. The plurality of picture elements and their grid positions within an image spot defines the respective intensity stage. The grid structure is oriented on a curve of the detection limit for the perceptability of sinusoidal grids. For producing a hexagon-like impression given the employment of grid positions situated in quadratic matrices, successive change lines of joining matrices or sub-matrices are shifted relative to one another by half a side length of the matrices or sub-matrices in the formation of the image spots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.