JPS6033020A - Acceptance an rejection deciding device for figured cloth - Google Patents

Abstract

PURPOSE:To decide the acceptance or rejection of a figured cloth material accurately by using the result of a visual acceptance/rejection decision and the result of an acceptance/rejection dicision based upon contrast due to a shift or fog of a pattern in combination. CONSTITUTION:When a placing table for a sample 1 stops at a specific colorimetric position, a spectrophotometer 3 measures a reflection factor distribution corresponding to each wavelength of reflected light from a specific area of the sample 1; and a color specification values at the colorimetry position is calculated from the measurement output, respectively summed up, and the mean color specification value is regarded as a standard color specification value. When the color difference between the mean color specification value and a standard color specification value is compared with permissible difference to perform an acceptance/rejection decision. Further, the difference in color specification value at each measurement point is calculated to calculate the difference between said difference and the difference in color specification value from the reference sample, and the difference in color specification value is compared with permissible value to make an acceptance/rejection decision.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an acceptance/rejection determination device for patterned dyed materials, printed materials, etc.

(Prior technology) In the past, color matching for dyed products and printed matter was done based on the experience and intuition of experts, but recently, as part of streamlining the color matching work, dyeing has been carried out using a combination of spectrophotometers, color difference meters, and computers. Color embellishment devices have been proposed that quantify the color characteristics of objects.

That is, the pass/fail judgment of the test object, which was conventionally performed by visual inspection, is now performed based on the color characteristic values output from the colorimetric device.
, it is something that will happen.

However, conventionally proposed colorimetric devices are generally limited to cases in which the object to be examined is a plain object, and there is no disclosure of application techniques for patterned objects.

(Objective) It is an object of the present invention to provide an automatic pass/fail determination device that more accurately determines pass/fail for pattern samples.

(Structure) The present invention basically includes a first pass/fail judgment means for determining the pass/fail of a patterned material sample based on coloring data in a plurality of colored areas having a certain area set for the sample; The present invention is characterized by comprising a second pass/fail determination means for determining pass/fail based on the colorimetric data of each movable colorimetric portion when moved a distance.

That is, the first pass/fail judgment means is a judgment means set based on the technical idea that, even for patterned objects, embellished color data from a certain area including the pattern can be regarded as a solid object with virtual colors mixed. It has been found that by providing appropriate criteria, the results of the pass/fail judgments for patterned items are in good agreement with the visual inspection results.

The second pass/fail determining means detects a difference in contrast caused by misalignment or blurring of the pattern, and determines whether the pattern is pass/fail.

That is, patterned items generally go through several coloring processes, but during this process, misalignment or blurring of the pattern may occur due to misalignment or wear and tear of the mold, as shown in FIG.

In FIG. 1, (a) is a normal pattern 1F')l is an example of its deviation; (C) is also a normal pattern, and ldl is an example of its boundary portion being blurred.

When such phenomena occur, visual inspection gives an impression that is quite different from that of the reference sample, so the observer should include these phenomena in comparison with the reference sample when determining the pass/fail of the measurement sample. However, there are cases where the first pass/fail judgment means cannot necessarily detect the difference in contrast due to such a phenomenon, and in such cases, the second pass/fail judgment means is used in combination. By doing so,
We have discovered that even more accurate pass/fail judgments can be made.

Embodiments of the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a sample placed on a movable sample stage (not shown).

2 is a light source p that irradiates a predetermined colorimetric area having a certain area on the surface of the sample 1; 3 is a spectrophotometer t that receives reflected light from the sample 1 at the colorimetric area and transmits its spectral distribution; 4 is a spectrophotometer t that receives reflected light from the sample 1 at the colorimetric area; Color value calculation means for inputting the spectral distribution from the spectrophotometer 3 and calculating one or more types of color value. 5 is a calculation constant storage means for storing constants used in the color value calculation means 4! Reference numeral 6 denotes an average color value calculation means for calculating the respective average values of the various color values at each color measurement site sent from the color value calculation means 4. 7 represents an average of one or more types of the target reference sample. The target colorimetric value storage means 8 for storing colorimetric values stores one or more types of average colorimetric values output from the average colorimetric value calculation means 6 and the target colorimetric value storage means 7. A color difference calculating means for comparing the target color values of one or more types of color data and calculating a color difference based on the difference between the color values in the image table; 9 is an allowable color difference storage means for recording the allowable color difference; 10 is 1
@1 pass/fail judgment means for comparing the color difference outputted from the recorded color difference calculating means 8 and the allowable color difference stored in the above-mentioned allowable color difference storage means 9 to judge the pass/fail of the measurement sample 1; 11 is the first pass/fail judge; This is first display means for displaying the determination result by means 10.

Further, in step 12, when the sample 1 is moved at minute intervals, one type of colorimetric value at each movable colorimetric portion is inputted from the colorimetric value calculating means 4, and the relationship between each moving distance and the colorimetric value is calculated. Pattern value calculation means for calculating - 13 is a real name target pattern value calculation means for storing pattern values for the target reference sample; 14 is a pattern value outputted from the pattern value calculation means 12 and the target pattern value storage means 13; Pattern value difference calculation means t for calculating the difference from the stored target pattern value 15 is an allowable pattern slight difference storage means for storing the allowable pattern value difference 16 is a pattern value difference output from the pattern value difference calculation means 14 The second pass/fail judgment means t17 compares the difference in allowable pattern values stored in the allowable pattern slight difference storage means 15 and judges the pass/fail of the measurement sample. It is a display means.

Next, the calculation method used in this embodiment will be explained.

One or more types of colorimetric values calculated by the colorimetric value calculation means 4 are defined in CIE1976Lab7. L+a
+1) r (r H, which is calculated from the tristimulus values x, y, and z according to the following equation.

a. Calculation of tristimulus values x, y, z The calculation formula for the tristimulus values x, y, and z is given as follows.

Here, K is a constant defined by the following equation, and takes a constant trajectory depending on the designated light source.

Engineering. (λ); Equicyclic function that takes a constant value depending on the specified light source (
Green) λ: Wavelength In the above equations (1) to (3), S(λ) is the spectral distribution of illumination light as shown in FIG. 3 ia), and takes a constant value depending on the designated light source.

ρ(λ) is the spectral reflectance distribution at the colored portion of the sample obtained by a spectrophotometer as shown in FIG. 3 (bl).

The product S(λ)ρ(λ) is the reflected light distribution of the sample as shown in Figure 3 (C1), which represents the spectral distribution of the reflected light at the colorimetric portion of the sample that enters the spectrophotometer. There is.

X(λ), y(λ), and 2(λ) are equicircular functions in which the observer's 2-degree visual field for red, green, and blue is a 10-degree visual field, as shown in the 31st ffi (di). (10 degree field of view).The function is given as a constant.

S(λ)ρ(λ) and the color matching function Ma(λ)・y(λ), T(
As shown in FIG. 3(e), each product with .lamda.

Figure 3 (The function of el is expressed as ZC+ of the above equations (1) to (3))
<Integrate to find X and Z.

This X, Y, and Z are the 'D14441 for the observer and the measurer.
The color stimulus value of x, that is, the color of the sample perceived by the
, y, z, and are the tristimulus halls of that color under the illumination light S(λ) of the specified light source.

The 73jf formula for b0 colorimetric value L, a, b, c, [1, a, , , 11 is given as follows.

L= 116 f (x/x□) --(51a=5
oo (f (X/X□)-f (Y/Y□))-・
・(61b=200[f(Y/Yo)−f(2770・−+7)c=Ja 2+b 2−River−ts+14
= tan ” (b/a) ・−・・−・(91 Here, f(X/Xo), f(Y/Yo)'+f(Z/Zo
) is tl=7.787L when t<0.008856.
-... It is a function expressed by (11).

Xo and YotZo are tristimulus values of irradiation light, and take constant values depending on the designated light source.

Average color value calculation means The average color value calculation means 6 calculates L ir a 1 +b at each color measurement site of the sample output from the color value calculation means 4.
i, Ci and ■11 average values L, a, b,
Calculate c and n. The average color value is the spectral reflectance ρ(
λ) or tristimulus values X, Y, and Z.

Color difference calculation means The color difference calculation means 8 calculates each color value L, a,, c, H calculated by the average color value calculation means 6, the target color value, and the valley table of the reference sample stored in the storage means 7. Color value Lo
, a o , b □ + Co + H □ to quantify the color difference between the measurement sample and the reference sample, and which color value is used as the evaluation factor for pass/fail judgment.
Alternatively, it is necessary to determine through experiments depending on the specific measurement sample which calculation formula should be used for quantification, but according to the experiments of the present inventors, if the color difference ΔE obtained by the following formula is used, It was found that the results generally matched well with the tendency for visual pass/fail judgments.

Here 0・k2. In 3, weighting between each color value is a coefficient.

Furthermore, depending on the measurement sample, the accuracy of pass/fail determination can be improved by using factors other than ΔE as evaluation factors.

Pattern value calculation means The pattern value calculation means 12 uses any one of the colorimetric values outputted from the colorimetric value calculation means 4. It quantifies the change behavior of .

The method of quantification also needs to be determined through experiments depending on the sample to be measured, but there are methods that use the pattern diagram itself as shown in FIG. 4, or methods that use colorimetric values at individual movement positions.

That is, in FIG. 4, the solid line is a pattern diagram showing the variation of the L value corresponding to the moving distance 11u d i obtained for the reference sample, and the dotted line is a pattern diagram obtained for the measurement sample.

To explain the quantification method of calculating the pattern value of a sample exhibiting such behavior using the colorimetric value at each moving position, in Fig. 4, moving distance 11d5 showing the highest L value for the reference sample is shown.
, or the moving distance d of, for example, three locations showing a high L value,
, d3. d5 and a moving distance d2 showing the lowest L value,
Alternatively, the moving distance d2 of three locations exhibiting low L values. d6.
d8, and the set displacement a distance n! for the measurement sample. ,
d1, d2, d3, d5, d6,
(L value β1 at 18.C2,13,15,C6,1
From 8 onwards, it is quantified using the following formula.

The pattern value difference calculation means 14 calculates the difference between the measurement sample and the reference sample based on the pattern value calculated by the pattern value calculation means 12 and the z6 value of the reference sample stored in the target pattern value storage means 13. It quantifies pattern value differences.

fil When using the pattern diagram itself as shown in Figure 4 as a pattern value, the pattern diagram of the measurement sample is translated in parallel so that it overlaps the pattern diagram of the reference sample, and the overlap resulting from the difference between the two pattern diagrams is minimized. Calculate the sum of areas or the sum of squares of the areas.

(2) When using colorimetric values at individual movement positions as pattern values The difference between the colorimetric values of the reference sample and the measurement sample at one or more specific movement positions is calculated.

(Operation) Next, the operation of the present invention will be explained with reference to the flowchart shown in FIG. 5 (Figure N and FIG. 5(B)).

(1) Trial with sample 1 placed 1) When the table moves to a predetermined coloring position and stops, the spectrophotometer 3 inputs the reflected light from a certain area of the sample 1 irradiated by the light source 2 and inputs the reflected light for each wavelength. A spectral reflectance distribution ρ1(λ) corresponding to λ is measured (steps S□, S2 and S3).

(2) If the above color measurement position is not a specific color measurement position,
The sample stage is moved to the next predetermined color measurement position, and the spectral reflectance distribution ρ2(λ) at the color measurement position is measured. This operation is repeated for all color measurement positions (steps s4.s5.s
6).

(3) When measurements at all color measurement positions are completed, the sample stage moves to a predetermined position (for example, sample exchange position) (step S7
).

(4) Spectral reflectance distribution ρ output from spectrophotometer 3
i(λ) to the colorimetric value Li at the color measurement position.

ai, J, ci, Hl as calculation constants, S (within λ”10・
Y 10 (λl, Z iotλ), Xo, Yo, Z
Calculate using o (steps S s , S 9 )
.

+51 1. Add the color values for each measurement position, and when the measurement at all color positions is completed, the average color value is obtained.

a, b, c, and H are calculated (step 51o).

(6) When the colorimetric sample is a reference sample, the above average colorimetric values are set as standard colorimetric values L□, a, ), bo, co, and Ho (steps 511 and 512).

(7) When the colorimetric sample is not a reference sample, a color difference ΔE is calculated from the difference between the average color value and the standard color value (step 513).

(8) Compare the above color difference △E and allowable color difference △Eo,
Displays failure when E>△Eo, and displays pass when △E△EO (step 5141S15IS161S17)
Note that in this example, acceptance or failure of the sample is determined by the allowable color difference △E.

However, depending on the target colorimetric sample, a-a stone-bc-cI4H.

Tolerance △a01△bo, △Co, △H0 for the difference in Otsu OI O+
The determination may be made by setting .

For example, for samples that place particular importance on the difference in red color, in addition to the above-mentioned △ILo, judgments are made using △aO or . , toE□, and also Δl)o or ΔCo or ΔI-10.

(9) When the color measurement position is a specific color measurement position, the sample stage moves in one direction by 1jd and stops (step 5181s19). The reflectance distribution ρd(λ) is measured by inputting reflected light from a certain area at a position d away from the color measurement position (step 520).

(u) Move the sample stage further in the same direction by a minute distance d, and measure the reflectance distribution ρ d (λ) at the color measurement position. This operation is repeated a predetermined number of times (step 521).

(12) Reflectance distribution ρid output from spectrophotometer 3
The colorimetric value Ldi at the color measurement position is calculated from (λ) (step 522).

(13) When the colorimetric sample is a reference sample, store the position D showing the maximum color value, the position D2 showing the ν color value, and the difference LM between the color values at both positions D□ and D2. (Steps 523-526).

(14) If the colorimetric sample is not the reference sample, use the rll above.
Calculate the difference Lm between the colorimetric values at fixed positions D1 and D2, and calculate the difference Lm between the colorimetric values and the difference LM between the colorimetric values of the reference sample.
The difference ΔL between the two is calculated (steps 527 to 529).

('15) Difference △L of color specification values determined above and tolerance △L
Compare with o and fail if △L>△Lo
If o, display pass (steps 530 to 533)
Q (16) If it is determined that the result is passed based on the above, proceed to step S5.
However, if it is determined to be a failure, the process goes to step S7.

Note that if you want pass/fail information for all colorimetric locations, go to steps ``21'' to ``55'' above.

(Measurement Results) Table 1 shows the measurement data for reference sample No. and measurement samples N1 to N4 of the same pattern measured in this example.

The sample used was an A4 size multicolor print.

The color difference value △E is the corresponding colorimetric portion of each sample (diameter 3att) 5
Each average color value obtained from 6 points is determined by a and b, and the pattern value LM is the maximum value when color measurement is performed at 10 points while moving 3 mm from a specific position on the pattern part of the reference sample. Lm is the difference between the color value at the bright color position where the reference sample shows the maximum and minimum values for other measurement samples, and L is the difference between pattern value difference 7. L
It is a value indicated by M−L m.

According to the observer's visual judgment of these measurement samples N4 to N4, samples N1 and N4 were determined to be defective.

In other words, if the color difference value △E is large, it is determined to be a defective product, and even if the color difference value E is small, if the pattern value difference △L is thick, it is determined to be a defective product. Therefore, each reference sample should not be tolerated. Color difference value △Eo and pattern value difference △
By setting Lo, it is possible to automatically determine whether each measurement sample passes or fails.

In this example, as the pattern value difference, △L, which is generally recognized by an observer as a difference in brightness contrast, is used, but △C or 1-1, which is recognized as a difference in candy contrast depending on the measurement sample, is used. It's okay. Furthermore, these may be used in combination.

Note that when the pattern value difference ΔL is used in this embodiment, the allowable pattern value difference Lo needs to be changed depending on whether the contrast of the measurement sample is larger or smaller than that of the standard sample.

Effect C) As described below, since the present invention is configured to measure a patterned sample using both the average color value and the pattern value, differences in contrast may occur due to, for example, mechanical causes. However, even if it is difficult to make an accurate pass/fail judgment because the average color value is averaged within the measurement point, the contrast difference can be detected by the pattern value, making it possible to judge pass/fail for patterned samples. can be done more correctly.

[Brief explanation of drawings]

Figure 1 shows the state of the printed pattern.
al, (C1 is normal, (bl is off, (di is blurred. The figures are pattern diagrams when the sample is slightly moved, Figure 5 (A) and Figure 5.
(B) is a flowchart showing the operation of the embodiment. 1... Sample, 2... Light source, 3... Spectrophotometer,
10...First pass/fail determining means, 16...Second pass/fail determining means. Patent applicant Kurashiki Boseki Co., Ltd. Agent Patent attorney I: Blue and white Ao 2 other people Figure 3 included (nm) λ (nm) Included (nm) Figure 4 do d+ dz ds d+ ds ds d7 d
8 ds part! 7I distance group 5rA) Figure 58) Go to Figure S7 Go to 55

Claims (1)

[Claims] 1) A sample on which a sample is placed, and a plurality of colorimetric sites set for the sample are sequentially moved to the coloring position, and the colorimetric sites at the chain side 1 are also moved at minute intervals. a stage; a light source that illuminates a colorimetric part of the sample placed at a colorimetric position by the movement of the sample stage; a colorimetric value calculating means for calculating one or more types of average colorimetric values in all colorimetric parts; and one or more types of average colorimetric values calculated by the colorimetric value calculating means, and a colorimetric value set for the standard sample. a color difference calculation means that calculates a color difference based on the difference between the same type of color specification value, and a first color difference calculation means that compares the color difference calculated by the color difference calculation means with a set allowable color difference to determine whether the sample is acceptable. The pass/fail judgment means and the fineness of the sample stage mentioned above! One type is obtained by receiving the reflected light from each minutely moving colorimetric part of the sample irradiated by the above light source, which is obtained when the colorimetric part of the sample placed at the colorimetric position is slightly moved by J\ movement. A pattern value calculation means calculates the above colorimetric value in correspondence with the moving distance, and a pattern value calculated by the above pattern value calculation means is compared with a pattern value at the corresponding color measurement part set for the standard sample. 1. A patterned article acceptance/rejection determination device, comprising: a second acceptance/rejection determination means for determining acceptance/rejection of a sample. 2) Claim 1 in which the color value is calculated based on the spectral reflectance output from a spectrophotometer attached to a light source.
The patterned material acceptance/failure determination device described in Section 1.