Facsimile and static presentation processing – Natural color facsimile – Measuring – testing – and calibrating
Patent
1995-01-20
2000-12-12
Grant, III, Jerome
Facsimile and static presentation processing
Natural color facsimile
Measuring, testing, and calibrating
H04N 146
Patent
active
06160643&
ABSTRACT:
An apparatus and a method are disclosed for digitizing a color negative picture and correcting the image signals in a way that they are linearly related to the luminance of the photographed scene for grey tones in the scene. A second embodiment allows obtaining on the basis of the color-corrected image signals a reproduction of true color of the scene on a color display unit. For determining the correction, use is made of the characteristic system curve indicating for each of the color components the relation between the luminance of a neutral color swatch in the scene and the density sensed by the scan system. Several methods for drafting said system curve are described. Furthermore, the way of obtaining the color-corrected image signals by means of a color transformation and the way of determining the transformation are explained.
REFERENCES:
patent: 5060061 (1991-10-01), Shishido et al.
patent: 5283671 (1994-02-01), Stewart et al.
patent: 5287418 (1994-02-01), Kishida
patent: 5387988 (1995-02-01), Hiratsuka et al.
patent: 5646750 (1997-07-01), Collier
Deschuytere Frank
Tuijn Chris
Agfa Gevaert N.V.
Grant, III Jerome
Kelley Edward L.
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