Effective pigment identification method, identification system, identification program, and recording medium therefor

• US 8,290,275 B2
• Filed: 01/09/2007
• Issued: 10/16/2012
• Est. Priority Date: 01/20/2006
• Status: Expired due to Fees

• Current Assignee: Kansai Paint Company Limited
• Original Assignee: Kansai Paint Company Limited
• Inventors: Sai, Keisuke, Masuda, Yutaka, Arai, Yoshinori
• Primary Examiner(s): DULANEY, KATHLEEN YUAN
• Application Number:
  US11/621,505
• Publication Number:
  US 20070172113A1
• Time in Patent Office: 2,107 Days
• Field of Search: 382/224, 382/190, 382/305, 382/162, 382/100, 345/591, 358/515, 356/402
• US Class Current: 382/190
• CPC Class Codes: G01J 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/463 Colour matching
• CPC Class Codes: G01J 3/504 Goniometric colour measurements, for example measurements of metallic or flake based paints
• CPC Class Codes: G01N 21/25 Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands

Abstract

The method of identifying an effective pigment comprises:

• • a first step of imaging a target effective pigment to obtain image data thereof;
  • a second step of subjecting the obtained image data to background processing and extracting image data concerning a region containing one particle of the effective pigment as image data for processing;
  • a third step of extracting image characteristic parameters from the image data for processing; and
  • a fourth step of identifying the target effective pigment, based on the image characteristic parameters of the target effective pigment extracted in the third step, using a pre-prepared database that stores information on various kinds of effective pigments in such a manner as to correlate with the image characteristic parameters of various kinds of effective pigments extracted by conducting the second and third steps.

Claims

1. A method of identifying an effective pigment comprising:

imaging the effective pigment to obtain first image data, wherein the imaged effective pigment imparts a design effect that changes appearance with angle of observation;

subjecting, using a computer, the obtained image data to background processing and extracting image data concerning a region containing only one particle of the effective pigment as second image data;

calculating, using the computer, characteristic parameters of the effective pigment from the second image data; and

identifying the effective pigment based at least in part on the extracted characteristic parameters and a pre-prepared database that stores, in a memory, information indicative of various kinds of effective pigments respectively associated with image data and characteristic parameters of the various kinds of effective pigments,

wherein the identified effective pigment imparts a design effect that changes appearance with angle of observation and the various kinds of effective pigments stored in the database each impart a design effect that changes appearance with angle of observation, and

wherein the stored image data of the various kinds of effective pigments each contain only one particle and the characteristic parameters of the various kinds of effective pigments are obtained by conducting said subjecting and said calculating, the characteristic parameters including parameters representing a color of the effective pigment, the parameters representing;

the color of the effective pigment including sine and cosine values of a dominant color hue angle, intensity of the dominant color, and saturation of the dominant color.

2. The method according to claim 1 wherein the characteristic parameters further include at least one characteristic parameter representing a surface condition of the effective pigment.

3. The method according to claim 2 wherein the characteristic parameters representing the surface condition of the effective pigment include a number of constituent colors, an average intensity gray level, and an average saturation gray level,

the number of constituent colors being a number of colors that occupy at least a certain proportion of a color-reduced image obtained by color-reducing an image of one particle of the effective pigment,

the average intensity gray level being determined by converting an image of one particle of the effective pigment into an intensity grayscale image, subjecting the intensity grayscale image to edge extraction to obtain an edge image, and calculating the average intensity gray level of the pixels in the intensity edge image;

and

the saturation gray level average being determined by converting an image of one particle of the effective pigment into a saturation grayscale image, subjecting the saturation grayscale image to edge extraction to obtain an edge image, and calculating the average saturation gray level of the pixels in the saturation edge image.

4. The method according to claim 3 wherein the characteristic parameters comprise at least one characteristic parameter representing a particle shape of the effective pigment.

5. The method according to claim 2 wherein the image characteristic parameters further include at least one characteristic parameter representing a particle shape of the effective pigment.

6. The method according to claim 5 wherein the characteristic parameters representing a particle shape of the effective pigment include particle size, circularity, outline condition, and number of notches,

the outline condition being a number of peaks and valleys in a two-dimensional contour profile obtained by plotting a distance from a centroid of one particle of the effective pigment in an image to pixels on an outline of the particle, in the order of tracing the outline, and

the number of notches being a number of deep valleys in the two-dimensional contour profile.

7. The method according to claim 1 wherein

the dominant color hue angle is a mode of a hue angle histogram of pixels in an image of one particle of the effective pigment in the HSI color space,

the intensity of the dominant color is an average intensity of pixels having the dominant color hue angle, and

the saturation of the dominant color is an average saturation of pixels having the dominant color hue angle.

8. The method according to claim 7 wherein the characteristic parameters comprise at least one characteristic parameter representing a particle shape of the effective pigment.

9. The method according to claim 1 wherein identifying the effective pigment comprises applying a neural network that uses the characteristic parameters of a particular effective pigment as input units and information regarding the particular effective pigment as output units.

10. The method according to claim 9 wherein output values of the output units are real numbers, and a predetermined number of effective pigments are selected from the database according to the output values of the output units.

11. The method of claim 1, wherein the characteristic parameters comprise at least one characteristic parameter representing a particle shape of the effective pigment.

12. The method of claim 1, wherein the characteristic parameters comprises at least one characteristic parameter representing a particle size of the effective pigment.

13. An effective pigment identification system comprising:

an image-capturing device for imaging an effective pigment and obtaining first image data, wherein the imaged effective pigment imparts a design effect that changes appearance with angle of observation;

a characteristic parameter detector for background processing the first image data, extracting an image of only one particle of the effective pigment as second image data, then image processing the second image data to computer characteristic parameters of the effective pigment; and

a recording device for storing a database of information indicative of various types of effective pigments respectively associated with image data and characteristic parameters of the various kinds of effective pigments, wherein the various types of effective pigments stored in the database each impart a design effect that changes appearance with angle of observation, wherein the image data of the various kinds of effective pigments each contain only one particle and the characteristic parameters of the various kinds of effective pigments are obtained by conducting said extracting and said computing;

wherein the characteristic parameter detector identifies the effective pigment based at least in part on the computed characteristic parameters and the database, and

wherein the identified effective pigment imparts a design effect that changes appearance with angle of observation, the characteristic parameters including parameters representing a color of the effective pigment, the parameters representing the color of the effective pigment including sine and cosine values of a dominant color hue angle, intensity of the dominant color, and saturation of the dominant color.

14. The system of claim 13, wherein the characteristic parameters comprise at least one characteristic parameter representing a particle shape of the effective pigment.

15. The system of claim 13, wherein the characteristic parameters comprises at least one characteristic parameter representing a particle size of the effective pigment.

16. A non-transitory computer-readable medium storing computer-executable instructions which, when executed cause a system to perform a method of identifying an effective pigment, the method comprising:

imaging the effective pigment to obtain first image data, wherein the imaged effective pigment imparts a design effect that changes appearance with angle of observation;

subjecting the obtained image data to background processing and extracting image data concerning a region containing only one particle of the effective pigment as second image data;

calculating characteristic parameters of the effective pigment from the second image data, the characteristic parameters including parameters representing a color of the effective pigment, the parameters representing the color of the effective pigment including sine and cosine values of a dominant color hue angle, intensity of the dominant color, and saturation of the dominant color; and

identifying the effective pigment based at least in part on the extracted characteristic parameters and a pre-prepared database that stores information indicative of various kinds of effective pigments respectively associated with image data and characteristic parameters of the various kinds of effective pigments,

wherein the identified effective pigment imparts a design effect that changes appearance with angle of observation and the various kinds of effective pigments stored in the database each impart a design effect that changes appearance with angle of observation, and

wherein the image data of the various kinds of effective pigments each contain only one particle and the characteristic parameters of the various kinds of effective pigments are obtained by conducting said subjecting and said calculating, the characteristic parameters including parameters representing a color of the effective pigment, the parameters representing the color of the effective pigment including sine and cosine values of a dominant color hue angle, intensity of the dominant color, and saturation of the dominant color.

17. The non-transitory computer-readable medium of claim 16 further comprising the pre-prepared database.

18. The non-transitory computer-readable medium of claim 16, wherein the characteristic parameters comprise at least one characteristic parameter representing a particle shape of the effective pigment.

19. The non-transitory computer-readable medium of claim 16, wherein the characteristic parameters comprises at least one characteristic parameter representing a particle size of the effective pigment.

20. An effective pigment identification system comprising:

a camera configured to image an effective pigment and obtain first image data, wherein the imaged effective pigment imparts a design effect that changes appearance with angle of observation;

a database configured to store information indicative of various types of effective pigments respectively associated with image data and characteristic parameters of the various kinds of effective pigments, wherein the various types of effective pigments stored in the database each impart a design effect that changes appearance with angle of observation; and

a processor configured to;

extract an image of only one particle of the effective pigment from the first image data as second image data,

compute characteristic parameters of the effective pigment from the second image data, and

identify the effective pigment based at least in part on the computed characteristic parameters and the database, wherein the identified effective pigment imparts a design effect that changes appearance with angle of observation,

wherein the image data of the various types of effective pigments each contain only one particle and the characteristic parameters of the various types of effective pigments are obtained by said processor configured to extract and compute, the characteristic parameters including parameters representing a color of the effective pigment, the parameters representing the color of the effective pigment including sine and cosine values of a dominant color hue angle, intensity of the dominant color, and saturation of the dominant color.