Method of and arrangement for line-by-line and point-by-point re

Details Method of and arrangement for line-by-line and point-by-point re Method of and arrangement for line-by-line and point-by-point re

1987-08-14

1988-07-12

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 77, G03B 2780

Patent

active

047573511

ABSTRACT:
A transparent colored original is scanned region-by-region and the density of each region in each of the primary colors red, green and blue determined. Each region represents an area constituted by a large number of points. The densities for each region are processed to generate parameters characteristic of the coloring of the respective region. These parameters are compared with respective threshold values. An overall density for the original in each of the primary colors is now calculated. In performing these calculations, those regions for which the characteristic color parameters exceed the respective threshold values are assigned less weight than the remaining regions. This is due to the fact that the former regions are assumed to contain color dominants. The orginal is next scanned line-by-line and point-by-point in each of the primary colors to generate imaging signals for use in printing the original on copy material. The magnitudes of the imaging signals are regulated in such a manner that the magnitudes of the signals for the different primary colors have a relationship similar to the overall densities of the original in the primary colors. The imaging signals are electronically processed to enhance the image of the original and the processed imaging signals are then supplied to a printer which reproduces the original line-by-line and point-by-point.

REFERENCES:
patent: 4101217 (1978-07-01), Fergg et al.
patent: 4279502 (1981-07-01), Thurm et al.
patent: 4406538 (1983-09-01), Buhler
patent: 4492458 (1985-01-01), Bickl et al.
patent: 4561768 (1985-12-01), Fursich et al.
"An Experimental Cathode-Ray Tube Printer", Durkin, Journal of Imaging Technology, vol. 12, No. 3, Jun. 1986, pp. 135-139.

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