Coating color database creating method, search method using the database, their system, program, and recording medium

• US 8,392,347 B2
• Filed: 06/19/2008
• Issued: 03/05/2013
• Est. Priority Date: 06/20/2007
• Status: Expired due to Fees

• Current Assignee: Kansai Paint Company Limited
• Original Assignee: Kansai Paint Company Limited
• Inventors: Fujieda, Tsukasa, Sai, Keisuke, Masuda, Yutaka
• Primary Examiner(s): CHEN, ALAN S
• Application Number:
  US12/663,364
• Publication Number:
  US 20100169255A1
• Time in Patent Office: 1,720 Days
• Field of Search: None
• US Class Current: 706/25
• CPC Class Codes: C23C 16/52 Controlling or regulating the coating process C23C16/45557, C23C16/279 take precedence
• 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: G06N 3/08 Learning methods

Abstract

The subject invention provides a method of creating a database for searching for a paint color having a desired texture, a search method using the database, and systems, programs, and recording mediums for carrying out the method and the search. The method for creating a database includes a step (S11) for storing spectral reflectance data and micro-brilliance data of a plurality of paint colors after associating each spectral reflectance data and each micro-brilliance data with a paint color code; a step (S13) for storing texture evaluation values of sample paint colors after associating the each texture evaluation value with the paint color code; a step (S14) for calculating characteristic quantities of the paint colors expressing textures using the spectral reflectance data and the micro-brilliance data, and storing the characteristic quantities after associating the each characteristic quantity with the paint color code; a step (S15) for carrying out a process for training a neural network using the characteristic quantities and the texture evaluation values of the sample paint colors as training data; and a step (S16) for inputting characteristic quantities of the paint colors other than the sample paint colors into the neural network after the training process, and storing output data after associating the each output data with the paint color code.

Claims

1. A method for creating a paint color database, comprising:

a first step of storing spectral reflectance data and micro-brilliance data expressing particle feeling of a plurality of paint colors in a recording unit after associating each spectral reflectance data and each micro-brilliance data with a code for specifying each paint color;

a second step of storing texture evaluation values of sample paint colors selected from the plurality of paint colors in the recording unit after associating the each texture evaluation value with the code;

a third step of calculating characteristic quantities of the paint colors expressing textures using the spectral reflectance data and the micro-brilliance data, and storing the characteristic quantities in the recording unit after associating the each characteristic quantity with the code;

a fourth step of carrying out a process for training a neural network having input units corresponding to the characteristic quantities and output units corresponding to the texture evaluation values, using the characteristic quantities and the texture evaluation values of the sample paint colors as training data; and

a fifth step of inputting characteristic quantities of the paint colors other than the sample paint colors into the neural network after the training process, and storing output data in the recording unit after associating the each output data with the code.

2. The method for creating a paint color database according to claim 1,

wherein:

the first step comprises a step of obtaining image data of each paint color using an imaging device and calculating micro-brilliance data from the image data,

the micro-brilliance data are HG, HB, HBL and SB,

the HG has a condition such that;

in cases where IPSL≧

0.32;

HG=500·

IPSL−

142.5

in cases where 0.32>

IPSL≧

0.15;

HG=102.9·

IPSL−

15.4

in cases where 0.15>

IPSL;

HG=0

the HB has a condition such that;

HB=(BV−

50)/2

the HBL is an HB found from the image data taken under a condition where GL=14, and the SB is an HG found from the image data taken under a condition where GL=125,

wherein GL represents an average gray level of image data, V and A respectively represent gross luminance volume and gross luminance area greater than a threshold=“

GL+32”

binarized by the threshold, L represents an average particle diameter binarized by a threshold=“

GL+24”

, PHav and PSav respectively represent an average peak height and an average peak skirt of luminance image that satisfy;

PHav=3V/A, PSav=L/PHav and BV=PHav+350PSav,

IPSL satisfies;

IPSL=∫

₀^N∫

₀^2π

P(ν

,θ

)dν

dθ

/P(0,0)

wherein ν

represents spatial frequency, θ

represents angle, P(ν

,θ

) represents power spectrum found from the image data, and 0 to N are spatial frequency regions for the particle feeling.

3. The method for creating a paint color database according to claim 1,

wherein:

the characteristic quantities include;

a characteristic quantity L*₁₅, a characteristic quantity a*₁₅, and a characteristic quantity b*₁₅, which are L* value, a* value, and b* value calculated from a spectral reflectance at an observation angle of 15°

in the L*a*b* color space, a characteristic quantity L*₄₅, a characteristic quantity a*₄₅, and a characteristic quantity b*₄₅, which are L* value, a* value, and b* value calculated from a spectral reflectance at an observation angle of 45°

in the L*a*b* color space, a characteristic quantity L*₇₅, a characteristic quantity a*₇₅, and a characteristic quantity b*₇₅, which are L* value, a* value, and b* value calculated from a spectral reflectance at an observation angle of 75°

in the L*a*b* color space;

a characteristic quantity FF(15,25), a characteristic quantity FF(25,45), a characteristic quantity FF(45,75), a characteristic quantity FF(75,110) and a characteristic quantity FF(15,45), which are found according to 2×

(Y₁₅−

Y₂₅)/(Y₁₅+Y₂₅), 2×

(Y₂₅−

Y₄₅)/(Y₂₅+Y₄₅), 2×

(Y₄₅−

Y₇₅)/(Y₄₅+Y₇₅), 2×

(Y₇₅−

Y₁₁₀)/(Y₇₅+Y₁₁₀), and 2×

(Y₁₅−

Y₄₅)/(Y₁₅+Y₄₅), respectively, wherein Y₁₅ represents a Y value calculated from a spectral reflectance at an observation angle of 15°

in the XYZ color space, Y₂₅ represents a Y value calculated from a spectral reflectance at an observation angle of 25°

in the XYZ color space, Y₄₅ represents a Y value calculated from a spectral reflectance at an observation angle of 45°

in the XYZ color space, Y₇₅ represents a Y value calculated from a spectral reflectance at an observation angle of 75°

in the XYZ color space, Y₁₁₀ represents a Y value calculated from a spectral reflectance at an observation angle of 110°

in the XYZ color space;

a characteristic quantity c*₁₅ that is a c* value calculated from a spectral reflectance at an observation angle of 15°

in the L*C*h* color space, a characteristic quantity c*₄₅ that is a c* value calculated from a spectral reflectance at an observation angle of 45°

in the L*C*h* color space, and a characteristic quantity c*₇₅ that is a c* value calculated from a spectral reflectance at an observation angle of 75°

in the L*C*h* color space;

a characteristic quantity cFF(15,25) that is found according to 2×

(c*₁₅−

c*₂₅)/(c*₁₅+c*₂₅), a characteristic quantity cFF(25,45) that is found according to 2×

(c*₂₅−

c*₄₅)/(c*₂₅+c*₄₅), a characteristic quantity cFF(45,75) that is found according to 2×

(c*₄₅−

c*₇₅)/(c*₄₅+c*₇₅), a characteristic quantity cFF(75,110) that is found according to 2×

(c*₇₅−

c*₁₁₀)/(c*₇₅+c*₁₁₀), and a characteristic quantity cFF(15,45) that is found according to 2×

(c*₁₅−

c*₄₅)/(c*₁₅+c*₄₅), wherein c*₂₅ represents a c* value calculated from a spectral reflectance at an observation angle of 25°

in the L*C*h* color space, and c*₁₁₀ represents a c* value calculated from a spectral reflectance at an observation angle of 110°

in the L*C*h* color space; and

characteristic quantities HG, HB, HBL and SB which are the micro-brilliance data.

4. A method for searching for a paint color in a paint color database created by the method for creating a paint color database according to claim 1, comprising:

a first step of receiving, as a search query, texture and an evaluation value that denotes a degree of presence of the texture;

a second step of retrieving an evaluation value corresponding to the texture from the database, and determining whether the evaluation value is a value indicating the presence of the texture; and

a third step of, if determining that the evaluation value is a value indicating the presence of the texture in the second step, giving a corresponding paint color code as a search result.

5. A system for searching for a paint color in a paint color database created by the method for creating a paint color database according to claim 1, comprising:

an arithmetic unit having a recording unit storing the database,

wherein;

the arithmetic unit receives, as a search query, texture and an evaluation value that denotes a degree of presence of the texture,

the arithmetic unit retrieves an evaluation value corresponding to the texture from the database, and determines whether the evaluation value is a value indicating the presence of the texture; and

if determining that the evaluation value is a value indicating the presence of the texture in the second step, the arithmetic unit gives a corresponding paint color code as a search result.

6. A non-transitory computer readable recording medium having stored thereon a program for searching for a paint color in a paint color database created by the method for creating a paint color database according to claim 1, by causing a computer to perform:

a first function of receiving, as a search query, texture and an evaluation value that denotes a degree of presence of the texture;

a second function of retrieving an evaluation value corresponding to the texture from the database, and determining whether the evaluation value is a value indicating the presence of the texture; and

a third function of, if determining that the evaluation value is a value indicating the presence of the texture in the second step, giving a corresponding paint color code as a search result.

7. A system for creating a paint color database, comprising:

an arithmetic unit having a recording unit;

a spectrophotometer; and

an imaging device,

wherein;

the arithmetic unit measures spectral reflectance data for each of a plurality of paint colors using the spectrophotometer,

the arithmetic unit obtains image data of the paint colors using the imaging device, and calculates micro-brilliance data expressing particle feeling of the paint colors from the image data,

the arithmetic unit stores the spectral reflectance data and the micro-brilliance data of the paint colors in the recording unit after associating each spectral reflectance data and each micro-brilliance data with a code for specifying each paint color,

the arithmetic unit stores texture evaluation values of sample paint colors selected from the paint colors in the recording unit after associating the each texture evaluation value with the code,

the arithmetic unit calculates characteristic quantities of the paint colors expressing textures using the spectral reflectance data and the micro-brilliance data, and stores the characteristic quantities in the recording unit after associating the each characteristic quantity with the code,

the arithmetic unit carries out a process for training a neural network having input units corresponding to the characteristic quantities and output units corresponding to the texture evaluation values, using the characteristic quantities and the texture evaluation values of the sample paint colors as training data; and

the arithmetic unit inputs characteristic quantities of the paint colors other than the sample paint colors into the neural network after the training process, and stores output data in the recording unit after associating the each output data with the code.

8. A non-transitory computer readable recording medium having stored thereon a program for creating a paint color database by causing a computer to realize:

a first function for storing spectral reflectance data and micro-brilliance data expressing particle feeling of a plurality of paint colors in a recording unit after associating each spectral reflectance data and each micro-brilliance data with a code for specifying each paint color;

a second function for storing texture evaluation values of sample paint colors selected from the plurality of paint colors in the recording unit after associating the each texture evaluation value with the code;

a third function for calculating characteristic quantities of the paint colors expressing textures using the spectral reflectance data and the micro-brilliance data, and storing the characteristic quantities in the recording unit after associating the each characteristic quantity with the code;

a fourth function for carrying out a process for training a neural network having input units corresponding to the characteristic quantities and output units corresponding to the texture evaluation values, using the characteristic quantities and the texture evaluation values of the sample paint colors as training data; and

a fifth function for inputting characteristic quantities of the paint colors other than the sample paint colors into the neural network after the training process, and storing output data in the recording unit after associating the each output data with the code.