Color reproducing device for reproducing matched colors and an outputting device for outputting information for reproducing a color of a coated surface

• US 5,590,251 A
• Filed: 08/05/1994
• Issued: 12/31/1996
• Est. Priority Date: 08/06/1993
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Takagi, Atsushi
• Primary Examiner(s): Herndon, Heather R.
• Assistant Examiner(s): BUCHEL JR, RUDOLPH JOHN
• Application Number:
  US08/286,350
• Time in Patent Office: 879 Days
• Field of Search: 395/130-131, 395/129, 395/127, 395/126, 395/9
• US Class Current: 345/604
• CPC Class Codes: C09D 7/00 Features of coating compositions, not provided for in group C09D5/00 driers C09F9/00; Processes for incorporating ingredients in coating compositions
• CPC Class Codes: G01J 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/462 Computing operations in or between colour spaces; Colour management systems
• CPC Class Codes: G01J 3/463 Colour matching
• CPC Class Codes: G01J 3/465 taking into account the colour perception of the eye; using tristimulus detection
• CPC Class Codes: G01J 3/504 Goniometric colour measurements, for example measurements of metallic or flake based paints
• CPC Class Codes: H04N 1/603 controlled by characteristics of the picture signal generator or the picture reproducer
• CPC Class Codes: H04N 1/6058 Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut

Abstract

By inputting a predetermined number of first data to a color reproducing device, a predetermined number of reproduced colors are respectively measured, and a plurality of relationships of correspondence between inputted first data and measured second data are determined. On the basis of the plurality of relationships of correspondence between the first data and the second data, relationships of interpolated correspondence, which express relationships between second data other than the measured second data and first data corresponding to the second data other than the measured second data, are estimated. After second data which is the same as or closest to a color to be reproduced is selected, first data corresponding to selected second data is selected on the basis of the relationships of correspondence and the relationships of interpolated correspondence. Selected first data is then inputted to the color reproducing device, and a color to be reproduced is reproduced.

Claims

1. A color reproducing device to which first data expressing a color expressed in a first colorimetric system is inputted, and which reproduces a color corresponding to the inputted first data and to be expressed in a second colorimetric system different than the first colorimetric system, comprising:

a measuring device measuring each of a predetermined number of colors reproduced by inputting a predetermined number of first data to said color reproducing device, and outputting a predetermined number of second data expressing a color expressed in the second colorimetric system;

estimating means for estimating relationships of interpolated correspondence expressing relationships between second data other than the measured second data and first data corresponding to the second data other than the measured second data, on the basis of a plurality of relationships of correspondence between the first data inputted to said color reproducing device and the measured second data; and

selecting means for, after second data which is the same as or closest to data of a color to be reproduced is selected on the basis of the relationships of correspondence and the relationships of interpolated correspondence, selecting first data corresponding to the selected second data on the basis of the relationships of correspondence and the relationships of interpolated correspondence,

wherein the selected first data is inputted to said color reproducing device, and said color reproducing device reproduces the color to be reproduced.

2. A color reproducing device according to claim 1, wherein the plurality of relationships of correspondence are nonlinear relationships.

3. A color reproducing device according to claim 1, wherein the first colorimetric system is an RGB colorimetric system, the second colorimetric system is an XYZ colorimetric system, the first data is data relating to at least one of a color material and a bright material, and the second data is data relating to tristimulus values.

4. An outputting device for outputting information for reproducing a color of a coated surface which is formed with one or a plurality of layers on an object to be coated and in which each of the layers is formed of at least one component material, comprising:

a color material mixing device to which characteristic values expressing respective quantities of all of the component materials forming the coated surface are inputted, and which generates a paint for forming the coated surface on the basis of the inputted characteristic values;

a measuring device measuring physical quantities expressing one of a spectral reflectance distribution and tristimulus values of each of a predetermined number of coated surfaces formed by coating on the object to be coated a paint which is generated by inputting to said color material mixing device a predetermined number of characteristic values in which at least one of the component material quantities is respectively different;

estimating means for estimating relationships of interpolated correspondence expressing relationships between physical quantities other than the measured physical quantities and characteristic values corresponding to the physical quantities other than the measured physical quantities, on the basis of a plurality of relationships of correspondence between the characteristic values inputted to said color material mixing device and the measured physical quantities;

selecting means for, after physical quantities relating to physical quantities of a paint color to be reproduced have been selected on the basis of the relationships of correspondence and the relationships of interpolated correspondence, selecting the characteristic values corresponding to the selected physical quantities on the basis of the relationships of correspondence and the relationships of interpolated correspondence; and

outputting means for outputting the selected characteristic values as information for reproducing the color of the coated surface.

5. An outputting device according to claim 4, wherein the physical quantities relating to physical quantities of the paint color to be reproduced are physical quantities which are the same as or closest to physical quantities of the paint color to be reproduced.

6. An outputting device according to claim 4, wherein said color material mixing device generates the paint on the basis of the information outputted from said outputting means.

7. An outputting device according to claim 4, further comprising:

display means for reproducing and displaying the color of the coated surface on the basis of the information outputted from said outputting means.

8. An outputting device according to claim 4, wherein said selecting means determines coordinate values on a coordinate expressing colors of a predetermined colorimetric system with respect to each of the tristimulus values in the relationships of correspondence and relationships of interpolated correspondence, and sets a plurality of coordinate values among the determined coordinate values as reference color coordinate values for expressing reference colors, and consecutively selects, as the characteristic values corresponding to the physical quantities, the characteristic values corresponding to the coordinate values between the tristimulus values of the paint color to be reproduced and at least one of the reference color coordinate values.

9. An outputting device according to claim 8, wherein said color material mixing device generates the paint on the basis of the information outputted from said outputting means.

10. An outputting device according to claim 8, further comprising:

display means for reproducing and displaying the color of the coated surface on the basis of the information outputted from said outputting means.

11. An outputting device according to claim 4, wherein said selecting means determines varied-angle characteristics of the coated surface expressing flip-flop relationships between a varied angle which is a light-receiving angle varied during reception of light reflected from the coated surface and brightness at the varied angle, on the basis of the spectral reflectance distributions in the relationships of correspondence and in the relationships of interpolated correspondence, and selects the characteristic values corresponding to the determined varied-angle characteristics as the characteristic values corresponding to the physical quantities.

12. An outputting device according to claim 11, wherein said color material mixing device generates the paint on the basis of the information outputted from said outputting means.

13. An outputting device according to claim 11, further comprising:

display means for reproducing and displaying the color of the coated surface on the basis of the information outputted from said outputting means.

14. An outputting device according to claim 4, wherein said selecting means determines a particle-size distribution of each of the component materials for each of the characteristic values in the relationships of correspondence and the relationships of interpolated correspondence, and determines depth indexes expressing the depth of paint colors on the basis of the determined particle-size distributions and the spectral reflectance distributions in the relationships of correspondence and in the relationships of interpolated correspondence, and selects the characteristic values corresponding to the determined depth indexes as characteristic values corresponding to the physical quantities.

15. An outputting device according to claim 14, wherein said color material mixing device generates the paint on the basis of information outputted from said outputting means.

16. An outputting device according to claim 14, further comprising:

display means for reproducing and displaying the color of the coated surface on the basis of the information outputted from said outputting means.