Multispectral color reproduction system with nonlinear coding

US6816284B1 · kind B1 · utility

Assignee

• Color Aix Perts GmbH · DE

Inventors

• Bernhard Hill · Hamburg, DE
• Friedhelm König · Aachen, DE

Key dates

• Filing date: Apr 7, 2000
• Grant date: Nov 9, 2004
• Expiry date: Apr 7, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N1/64
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A multispectral color reproduction systems in which the spectral distribution of the light reflected by an exposed image, which distribution contains the color information, is recorded dot by dot and is coded in the form of a linear decomposition into weighted basic functions with multispectral coefficients as weighting coefficients and is transmitted to an image reproduction device, where a decoding takes place. The multispectral coefficients of the linear spectral display is nonlinearly distorted in a coding system adapted to the human color distinction capacity, wherein the distortion is made dependent on all or individual dominant amplitudes of the multispectral coefficients and the distortion is again canceled in a decoding system. This may be embodied by based on multidimensional look-up tables or by use of a system with distortion and correction functions controlled in a stepwise manner. The coding be based on only the differences of nonlinearly distorted amplitudes being transmitted to estimated values.