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Title:
COLOUR MEASURING METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO1997044642
Kind Code:
A3
Abstract:
The system includes a signal acquisition chain with a video camera (2), a microprocessor (3) and a cathode-ray tube display (6). The camera has three charge-coupled devices (8-10) delivering analogue red, green and blue signals for each pixel of the image of an object (O) exposed advantageously to a xenon lamp (7). The microprocessor incorporates a three-channel digitiser (6) providing 8-bit encoded signals. The transfer matrix and a correction function for nonlinearity of the chain are computed iteratively from known trichromatic components in a primary-colour reference system with at least two grey levels.

Inventors:
CAISEY-BLUTEAU LAURENCE (FR)
AUBERT JOHAN (FR)
Application Number:
PCT/FR1997/000911
Publication Date:
January 08, 1998
Filing Date:
May 23, 1997
Export Citation:
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Assignee:
OREAL (FR)
CAISEY BLUTEAU LAURENCE (FR)
AUBERT JOHAN (FR)
International Classes:
G01J3/50; G01J3/46; G06T5/00; H04N5/14; H04N17/04; H04N17/02; (IPC1-7): G01J3/50
Domestic Patent References:
WO1990000733A11990-01-25
WO1996005489A11996-02-22
WO1987003470A11987-06-18
Foreign References:
US5495429A1996-02-27
EP0562745A21993-09-29
EP0560170A21993-09-15
Other References:
SIMPSON M L ET AL: "IMAGING COLORIMETRY: A NEW APPROACH", APPLIED OPTICS, vol. 30, no. 32, 10 November 1991 (1991-11-10), pages 4666 - 4671, XP000241792
PEYRUCA J -F: "LA MESURE DES COULEURS", MESURES REGULATION AUTOMATISME, no. 666, 1 June 1994 (1994-06-01), pages 127 - 132, XP000455101
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