Method and arrangement for the representation of a halftone imag

Details Method and arrangement for the representation of a halftone imag Method and arrangement for the representation of a halftone imag

1985-10-03

1987-03-17

Goldberg, E. A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358296, 358283, 352 43, H04N 121, H04N 140, G03B 2132

Patent

active

046512284

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.

REFERENCES:
patent: 4374388 (1983-02-01), Heinzl
Institute of Electrical and Electronics Engineers, International Conference on Communications, Jun. 11-13, 1973, Seattle, Washington, New York; pp. 26-13 through 26-15.
IEEE #83 CH 1874-7, "A New Rule for Minimizing Unwanted Texture in Two-Level Rendition of Continuous-Tone Pictures by Fumitaka Ono et al. Coordinated Science Laboratory, University of Illinois, Urbana, Ill.

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