JP3154007B2 - Color identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color discriminating apparatus for measuring the color of a color discrimination object and discriminating to which of a plurality of reference colors it belongs.

[0002]

2. Description of the Related Art In a conventional RGB color identification device, the following procedure is used to identify to which of a plurality of reference colors a color of a color identification object belongs. First, red, green, and blue color component signals R, G, and B of the color sensor are measured for all necessary reference colors in advance, and values represented by the following four equations are obtained and registered as color information. deep.

S = R + G + B X = R / S Y = G / S Z = B / S Then, allowable values are set for the respective values of S, X, Y and Z. In color identification, a color of an object to be color-identified is measured, and a reference color in which all the values of S, X, Y, and Z for the color fall within the allowable value range is searched, and the corresponding color is output. I do.

[0004]

However, in the conventional color discriminating apparatus, if the permissible values of S, X, Y, and Z are large, a plurality of colors of the color discrimination object are output, or conversely, the permissible If is small, no output may be obtained.

[0005] For this reason, in the conventional color discriminating apparatus, the purpose,
There was a trouble that the allowable value had to be adjusted according to the use conditions. Therefore, there has been a lack of versatility.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. In one apparatus, the color of a color identification object can be changed to one of a plurality of reference colors without adjustment. An object of the present invention is to provide a versatile color identification device that can be identified as being.

[0007]

SUMMARY OF THE INVENTION A color identification apparatus according to the present invention compares color information (X, Y, Z) of a color to be identified with color information (X, Y, Z) of a reference color. Choose the color information that has the most difference from among them, and determine the degree of belonging to all the reference colors of the identified color according to the difference, that is, the larger the difference, the smaller the degree of belonging It is provided with color identification means for identifying that the color to be identified belongs to the reference color having the highest degree of belonging.

[0008]

In the color discriminating apparatus provided with the above-described color discriminating means, the discriminated color is discriminated by comparing the degree of belonging of each color to each reference color, so that the answer is almost one.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an electrical configuration of a color identification device according to an embodiment. In the sensor head 1, the standard light emitted from the halogen lamp 2 is condensed by the lens 3 and applied to the color identification object 4, the reflected light is received by the titanium oxide / selenium color sensor 5 and the output current is To obtain color component signals R, G, B.

In the apparatus main unit 7, this signal is A / D converted by the A / D converter 8 and sent to the CPU 9. CPU 9
Various operations are performed based on the processing procedure and the database written in the memory 10 to perform color identification. Note that the memory 10
, Values represented by the above-described four formulas of S, X, Y, and Z for all necessary reference colors are registered as color information in advance. At this time, the operation state is input via the interface 11 by the mode change switch 12 and the reference color registration switch 13, and is output to the liquid crystal display 14. The apparatus main body 7 includes a circuit power supply 15 and a lamp power supply 1.
6 is also incorporated, and is turned ON and O by the power switch 17.
FF.

Next, a processing procedure by the CPU 9 will be described with reference to FIG. First, the system is initialized (step 1). When the mode changeover switch 12 is in the reference color setting mode (step 2), the name of the reference color is displayed on the liquid crystal display 14 (step 3). When the reference color registration switch 13 is registered (step 4), the color component signals R, G, and B of the color sensor 5 receiving the reflected light from the reference color are taken in (step 5), and X, Y, and Z are calculated. Then, the value is stored (step 6), and the registration is displayed on the liquid crystal display 14 (step 7). When the reference color registration switch 13 is ready (step 8), the operation for registering the next reference color is started.

When the mode switch 12 is set to the color identification mode (steps 2 and 9), the color component signals R, G and B of the color sensor 5 receiving the reflected light from the color identification object 4 are taken in (step 10). Calculate X, Y, Z (Step 1)
1). X of one reference color stored in the memory 10,
The values of Y and Z are read (step 12), and the degree of belonging of the measured color to the reference color is calculated (step 13). Steps 12 and 13 are repeated for all the reference colors (step 14), the reference color having the highest degree of belonging is selected (step 15), and the result is displayed on the liquid crystal display 14 (step 16).

The color identification method of steps 12 to 15 will be described in detail with reference to FIG. Here, the reference color is A
And B are two colors. The graph 21 is a membership function for the reference color A with respect to X, in which the vertical axis represents the membership degree of the reference color A and the horizontal axis represents X. X obtained by measuring the reference color A is set as the degree of belonging 1 and is taken at the top of the graph 21. In the embodiment, the shape of the membership function is a triangle, and the width of the base is uniformly 0.5. The quantization precision at the time of digital processing was set to 32 levels for both the height and the base of the triangle. Similarly, graph 22 is a membership function for Y of reference color A, graph 23 is a membership function for Z of reference color A, graph 25 is a membership function for X of reference color B, and graph 26 is a reference color The membership function for B with respect to Y, and graph 27 is the membership function for reference color B with respect to Z.

Now, the color of the color identification object is measured, and its X
Is the vertical dashed line between the graphs 21 and 25, the Y value is the vertical dashed line between the graphs 22 and 26, and the Z value is the graph 23.
And a vertical dashed line in the graph 27.
The value of this X on graph 21 and the value of Y on graph 22
The value taken by Z and the value taken by Z on the graph 23 are shown by a horizontal broken line. The three values are compared, and the smallest value is set as the degree of belonging of the identified color to the reference color A. That is graph 24. In this example, the degree of belonging to X is adopted. Similarly, the degree of belonging of the discriminated color to the reference color B is determined as shown in a graph 28 by adopting the lowest degree of belonging to Z in the graphs 25 to 27 since it is the smallest. When the graph 24 and the graph 28 are compared, since the degree of belonging to the reference color B is larger, the color of the color identification object is identified as the reference color B.

This color identification device is only one embodiment. The color sensor may be replaced by another sensor such as a silicon color sensor, and not limited to the three-color sensor, but may be a two-color sensor or a sensor of more colors. A xenon lamp can be used instead of a halogen lamp. The optical system, electrical configuration, and processing procedure are not limited to those described above. There are various forms of membership function. A triangle having a shape different from the above-mentioned triangle may be used, and a trapezoid or a graph that is represented by a curve may be used. X, Y, and Z can be different functions. The quantization accuracy of the height and width of the membership function is not limited to the above.

[0016]

As described above, the color identification device according to the present invention can identify the color of the color identification object as one of the plurality of reference colors under any circumstances. Therefore, there is an effect that one device can be used for various purposes without adjustment.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of an embodiment.

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 is an explanatory diagram of a color identification method in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sensor head 2 Halogen lamp 3 Lens 4 Color identification object 5 Titanium oxide / selenium color sensor 6 Preamplifier 7 Main body 8 A / D converter 9 CPU 10 Memory 11 Interface 12 Mode switch 13 Reference color registration switch 14 Liquid crystal display 15 Circuit power supply 16 Lamp power supply 17 Power switch

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Kobayashi 225 Shirahatakami-cho, Kanagawa-ku, Yokohama-shi, Kanagawa-ken Inventor Yu Hotta 205 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Moririka Research Department, Inc. JP-A-145928 (JP, A) JP-A-3-27442 (JP, A) JP-A-3-43827 (JP, A) JP-A-3-214237 (JP, A) JP-A-2-93940 (JP, A) JP-A-2-280019 (JP, A) JP-A-3-218425 (JP, A) JP-A-60-171424 (JP, A) JP-A-63-163219 (JP, A) (58) Field (Int.Cl. ^7, DB name) G01J 3/00 - 3/52 G06F 9/44 G01N 21/00 - 21/74 JICST file (JOIS)

Claims (1)

(57) [Claims] A color sensor receives light from a color identification object, and outputs a plurality of color component signals output from the color sensor or a plurality of color information obtained by calculating based on these values. A color identification device that performs color identification by comparing with color information of a reference color, selects color information that has the most difference by comparing color information of a color to be identified and color information of a reference color, and selects color information that is the most different according to the degree of the difference. A color identifying means for determining the degree of belonging of the discriminated color to all reference colors and including color discriminating means for discriminating that the discriminated color belongs to the reference color having the largest degree of belonging among all the reference colors. Identification device.