Method and system for selecting a previous color match from a set of previous color matches that best matches a color standard

• US 5,841,421 A
• Filed: 12/18/1995
• Issued: 11/24/1998
• Est. Priority Date: 12/18/1995
• Status: Expired due to Term

• Current Assignee: Sabic Innovative Plastics IP BV (Government of Saudi Arabia)
• Original Assignee: General Electric Company
• Inventors: Graf, John Frederick, Cheetam, William Estel
• Primary Examiner(s): Mengistu, Amare
• Application Number:
  US08/574,013
• Time in Patent Office: 1,072 Days
• Field of Search: 345/150, 356/402, 356/421, 356/425, 364/526, 395/131, 428/64
• US Class Current: 345/593
• CPC Class Codes: G01J 3/463 Colour matching
• CPC Class Codes: G01J 3/50 using electric radiation detectors

Abstract

The present invention discloses a method and system for selecting a previously used color match from a plurality of previously used color matches that best matches a color standard. In the present invention, each of the plurality of previously used matches are identified with a spectral reflectance and a color formula. The present invention includes measuring a color spectrum and spectral reflectance of the color standard. The spectral reflectance of each of the plurality of the previously used color matches are then processed. The processed plurality of previously used color matches are searched for a set of previous color matches that have a high probability of being adapted to attain the color spectrum and spectral reflectance of the color standard. Next, a color match that provides the best match with the color of the standard is determined from the set of previous color matches. The formula of the best match is used to reproduce the color of the standard. The color formula of the best match is adapted until there is an acceptable match with the color of the standard.

Claims

1. A computer-implemented method for selecting a previously used color match from a plurality of previously used color matches that best matches a color standard, each of the plurality of previously used matches identified with a spectral reflectance and a color formula, the method comprising the steps of:

measuring a color spectrum and spectral reflectance of the color standard;

processing the spectral reflectance of each of the plurality of the previously used color matches;

searching the processed plurality of previously used color matches for a set of previous color matches that have a high probability of being adapted to attain the color spectrum and spectral reflectance of the color standard;

determining a color match that provides the best match with the color of the standard from the set of previous color matches;

using the color formula of the best match to reproduce the color of the standard; and

adapting the color formula of the best match until there is an acceptable match with the color of the standard.

2. The computer-implemented method according to claim 1, wherein the color spectrum and spectral reflectance of the color standard is obtained by a spectrophotometer.

3. The computer-implemented method according to claim 1, wherein the step of processing comprises normalizing the spectral reflectance of the plurality of previously used color matches.

4. The computer-implemented method according to claim 1, wherein the step of processing comprises determining the slopes of the spectral reflectance of the plurality of previously used color matches.

5. The computer-implemented method according to claim 1, wherein the step of processing comprises determining the minima and maxima of the spectral reflectance of the plurality of previously used color matches.

6. The computer-implemented method according to claim 1, wherein the step of searching comprises comparing the spectral reflectance of the color standard to the processed spectral reflectance of each of the plurality of previously used color matches.

7. A system for selecting a previously used color match from a plurality of previously used color matches that best matches a color standard, each of the plurality of previously used matches identified with a spectral reflectance and a color formula, the system comprising:

a spectrophotometer for measuring and a color spectrum and spectral reflectance of the color standard; and

a processor for selecting a previously used color match from the plurality of previously used matches that best matches the color standard, the processor including means for processing the spectral reflectance of each of the plurality of the previously used color matches, means for searching the processed plurality of previously used color matches for a set of previous color matches that have a high probability of being adapted to attain the color spectrum and spectral reflectance of the color standard, means for determining a color match that provides the best match with the color of the standard from the set of previous color matches, means for using the color formula of the best match to reproduce the color of the standard, and means for adapting the color formula of the best match until there is an acceptable match with the color of the standard.

8. The system according to claim 7, wherein the processing means normalizes the spectral reflectance of the plurality of previously used color matches.

9. The system according to claim 7, wherein the processing means determines the slopes of the spectral reflectance of the plurality of previously used color matches.

10. The system according to claim 7, wherein the processing means determines the minima and maxima of the spectral reflectance of the plurality of previously used color matches.

11. The system according to claim 7, wherein the processor further includes means for comparing the spectral reflectance of the color standard to the processed spectral reflectance of each of the plurality of previously used color matches.