JP2015045593A - Method of inspecting numeric value of color of exterior material, and correction tool therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of inspecting a numeric value of a color of an exterior material, and a correction tool therefor, by and with which numeralization of a color of an exterior material can be performed regardless of image-capturing environment such as sunshine even in the case of the exterior material being rugged, without a dedicated measuring instrument.SOLUTION: Numeralization of a color of an exterior material is performed as follows. A correction tool 1 is prepared which is divided into a gray part 1a and a white part 1b, of which numeric values of colors are known, and is provided with an evaluation window 3 in a part surrounded by the gray part 1a. The correction tool 1 is put on the exterior material 4 such as an exterior wall so that the evaluation window 3 is located in an inspection position of the exterior material 4 and the white part 1a is located below. In this state, the correction tool 1 is image-captured by digital imaging-capturing means 2 along with the exterior material 4 within the evaluation window 3. A color of an image of captured digital image data is compared with the known color numeric values of the correction tool 1 to correct differences between the captured image data and the known color numeric values, respectively, whereby a numeric value of a color of the exterior material 4 is calculated. The calculated numeric value of the color is compared with an initial value of the color or the like to determine deterioration of the exterior material.

Description

  This invention is used for judgment of the degree of deterioration of exterior materials that are members facing the outside such as outer wall materials and roof materials in houses and other buildings, quality control at the time of new construction of the exterior materials and the production stage, etc. In particular, the present invention relates to a color numerical inspection method and a correction tool thereof for inspecting color numerical values.

  Exterior materials such as outer walls in buildings deteriorate due to the effects of solar heat, moisture, ultraviolet rays, etc., and color changes, choking, dirt, etc. appear over time. In particular, the color change often occurs at a stage before choking or smearing. For this reason, it is common to digitize the color and grasp the degree of deterioration based on the difference from the initial value. A color difference meter is used for digitizing the color.

  As a method for digitizing the color, a method represented by “Lab” or the like using a color difference meter or the like is generally performed. Here, “L” represents lightness, and “ab” represents green, red, blue, and yellow saturation, and evaluation of the degree of progress of deterioration by brightness difference, saturation difference, and color difference that comprehensively evaluates them. Used as an indicator. Note that “Lab” and “ab” are numerical values generally indicated by the color systems of “L * a * b *” and “a * b *”. In this specification, the following explanation is given. The star symbol is also omitted in FIG.

  The color difference meter has a mechanism for measuring a vertical color reflected by directing diffused light from multiple directions by directly contacting a sensing portion of about 8 mm in diameter with an outer wall or the like. The structure around the φ8mm sensor is equipped with a horizontal auxiliary member (attachment) of φ40mm to improve the adhesion between the sample and the sensor and prevent extra light from entering from the outside. is there.

  Usually, the outer wall material has unevenness such as a handle that can be judged visually. In some cases, a groove having a width of about 20 mm is provided. For this reason, the attachment of the color difference meter interferes and may not be in close contact, and there is a possibility that measurement cannot be performed correctly. In addition, when the groove pitch of the outer wall is narrow, there is a possibility that a recess is included in the sensing unit. In addition, since the sensing unit is small, there is a problem that variation is large for each measurement site in the case of a multicolor sample. Furthermore, since the color difference meter is expensive and wired, it has disadvantages such as poor operability in the realization field and limitations on measurement.

As described above, the color difference meter may not be able to measure correctly with uneven exterior materials, etc., and is an expensive dedicated device, so it is easy to numerically calculate the color of degraded parts etc. without using a color difference meter. A method has been proposed. For example, using a commercially available digital camera, a photograph including a color card with a known color value such as Lab and a part to be evaluated is taken, and color correction of the known color part is performed, so that the entire part including the evaluation part is corrected. A simple and inexpensive method for correcting the color has been proposed.
Color cards include 18% gray cards used to adjust exposure and color when shooting still life and people with a camera, and 18% gray, absolute black, and pure white are combined on a cube surface. There is a cube shape that corrects the image at the reference point.

JP 2011-099709 A Japanese Patent No. 4158350 JP 2010-117259 A

  In a camera such as a digital camera, the brightness of a subject is recognized as 18% gray, which is an intermediate color, so that white objects appear darker and black objects appear brighter. On the other hand, when the 18% gray reflector is photographed with automatic exposure, it is designed so that the appropriate exposure is always obtained. Therefore, the reflected peripheral colors are photographed with colors close to natural.

  The gray card of the prior art is composed of an intermediate color whose surface is close to 18% gray. By including it in the subject, the camera's auto function can provide optimal exposure and color values are clear. The resulting 18% gray is reflected, which has the advantage of making it easier to adjust the color of the image after shooting. However, if you want to shoot a part of a large plane such as the outer wall, it will inevitably include an outer wall with a relatively large area other than the card.For example, in the case of a white outer wall color, the area is about half the shooting range. There is a problem that only the white part of the outer wall is included, the exposure does not match, and it becomes darker than the real thing.

  On the other hand, when shooting a wall surface including a cubic tool, the 18% gray part is small in the first place, and the problem is that the exposure does not match as in the case of the gray card, as well as the subject wall surface and the tool surface. Because the angles are different, when used on the wall facing the alley between the dwelling units, the upper half of the tool appears brighter due to sunlight and the lower half appears darker. In addition, since the tool is three-dimensional, the subject may become a shadow of a cube tool, and there is a problem that the accuracy is not improved until color correction after shooting.

An object of the present invention is to provide a color numerical value inspection method for an exterior material that can correctly digitize the color even if the exterior material has unevenness or the shooting environment such as sunshine is different, without using a dedicated measuring instrument, and its It is to provide a correction tool.
Another object of the present invention is to make it possible to correctly quantify a color and to perform deterioration determination with high accuracy.

The method for inspecting the color value of an exterior material according to the present invention is a surface material, and the surface has two parts, a part where L in the Lab display is known, L is 45 to 55, and L is 98 to 105. And a preparation step (S1) of preparing a correction tool having an evaluation window at a position where L is surrounded by a portion of 45 to 55.
Overlaying the correction tool on the exterior material so that the evaluation window is located at the inspection location of the exterior material to be inspected and the portion where L is 45 to 55 is located on the bright side of the surrounding environment Process (S2);
A photographing step (S3) of photographing the surface of the correction tool together with the surface of the exterior material in the evaluation window with a digital photographing means in a state where the correction tool is overlaid,
A color numerical value calculating step (S4) for calculating a numerical value of the color of the portion of the exterior material in the evaluation window from the color of the image of the photographed digital data;
including.
For example, the exterior material is a built-up outer wall, and the L of the correction tool is positioned on the upper side in the overlapping process and the photographing process. The portion where L is 45 to 55 and the portion where L is 98 to 105 are portions that become gray and white, respectively, in an achromatic color.

  In many cases, the degree of deterioration of the exterior material 2 such as the outer wall is usually evaluated by the color difference ΔE, but ΔE is often determined by ΔL (change in brightness) in Lab. In camera shooting, the element that determines the “brightness” of the subject is “exposure”. The present invention focuses on this, and the correction tool is used as means for realizing shooting with high accuracy and high reproducibility. Is used. The color values are not limited to being expressed in Lab, and the same applies to the case where they are expressed in RGB or CMKY.

According to this method, a correction tool whose color value is known is photographed with digital photographing means together with the exterior material in the evaluation window, so the environment changes during photographing such as sunlight and weather, and the model of the digital photographing means Even if there is a difference in characteristics due to, the color of the exterior material is color-corrected appropriately by correcting the color of the exterior material according to the change in the color image of the correction tool part in the image, and numerical values Can be
Moreover, since the periphery of the evaluation window of the correction tool is a portion where L is 45 to 55, photographing itself can be performed appropriately. That is, since the digital photographing means, so-called digital camera, has a characteristic that the photographing screen is averaged to 18% gray at the time of photographing in general, when a color known surface in which 18% gray is the majority is photographed together, it is reflected. The surrounding colors were taken with colors close to nature. In this way, since the image is captured with a color closer to natural at the time of shooting, the numerical value of the color can be obtained with higher accuracy.

Further, the correction tool is color-coded into two parts, L part of 45 to 55 and L part of 98 to 105, and the part of L 45 to 55 is positioned on the bright side of the surrounding environment. Since the correction tool is stacked on the exterior material, the influence of light can be leveled even if the shooting environment is light and dark depending on the direction.
For example, in the case of an outer wall in a state where an exterior material is built, the portion of the correction tool where L is 45 to 55 is positioned on the upper side.
The upper part of the outer wall is strongly affected by sunlight and looks bright. On the other hand, the lower part appears darker than the upper part due to the influence of reflection from the ground. In order to cancel the influences, that is, the correction tool is arranged such that L is in the upper part of 45 to 55 and lower part is in the lower part of 98 to 105, so that the influence of light can be leveled.
Not only the exterior wall in the built state, but also when inspecting the exterior materials at the production stage indoors, the lighting environment to shoot often has directionality and bias, in such cases, The effect of light can be leveled by overlaying the correction tool on the exterior material so that the portion of L of 45 to 55 is positioned on the bright side of the surrounding environment.

For a photographed image, for example, a commercially available image editing software or the like is used to select a range to be evaluated, and an average Lab of the selected range is read, so that the numerical value of the color can be known. Alternatively, a method may be used in which a known 18% gray portion of the numerical value of the color is selected as a range, the average Lab of the selected range is read, and the difference is compared with the known Lab.
In this way, even when the shooting environment such as sunshine is different, it is possible to correctly perform color digitization.

The exterior numerical value inspection method of the present invention may include a deterioration determination process for determining deterioration of the exterior material from the color value of the exterior material calculated in the color numerical value calculation process.
For example, the brightness, saturation difference, and color difference are obtained from the initial Lab prepared in advance and the Lab obtained from the image photographed by the digital photographing means (2) in the actual building. In this way, by knowing the difference in the numerical values of the color such as brightness, saturation difference, color difference, etc., by comparing this with a prediction diagram of deterioration prepared in advance, the degree of deterioration of the exterior material, and the remainder Appropriate presentation of service life and maintenance time is possible.

The correction tool has an upper portion of gray with L of about 50 and a lower portion of white with about L100, and a shooting frame indicating a shooting range is provided on the surface of the correction tool, and the ratio of the white portion in the shooting frame is determined. It is preferable to set it to 15 to 25% with respect to the whole surface of the correction tool.
By providing a photographing frame and photographing so that the ratio of the white portion falls within an appropriate range, it is possible to correctly quantify the color and perform accurate deterioration determination. Appropriate proportions of white parts have been found to be in the range of 15-25% by testing.

The correction tool for color value inspection of an exterior material according to the present invention is a correction tool used in the color value inspection method for exterior material according to the present invention, and is formed into a face material and the surface has L known in Lab display. And L is divided into two parts, that is, a part of 45 to 55 and a part of L is 98 to 105, and an evaluation window is provided at a place surrounded by the part of L of 45 to 55.
According to this correction tool, as described above for the color value inspection method of the exterior material of the present invention, without using a dedicated measuring instrument, even with an uneven exterior material, or even in a shooting environment such as sunshine, Color can be digitized correctly.

According to the method for inspecting the color values of the exterior material according to the present invention, the surface is formed into a face material and the surface is color-coded into two parts, that is, L in the Lab display and L is 45 to 55 and 98 to 105, respectively. And a preparation process for preparing a correction tool having an evaluation window at a location surrounded by the portion of L of 45 to 55, the evaluation window is positioned at the inspection location of the exterior material to be inspected, and the L And a process of superimposing the correction tool on the exterior material so that a portion of 45 to 55 is positioned on the bright side of the surrounding environment, and with the surface of the exterior material in the evaluation window in a state of overlapping the correction tool A photographing process for photographing the surface of the correction tool with a digital photographing means, and a color numerical value calculating process for calculating a numerical value of a color of the portion in the evaluation window of the exterior material from the color of the image of the photographed digital data Including Because it is, without using a dedicated measuring instrument, in exterior materials an uneven, also be different shooting environment sunshine, etc., it is possible to perform color digitizing correctly.
A correction tool for color value inspection of an exterior material according to the present invention is a correction tool used in a color value inspection method for an exterior material. The correction tool is formed into a face material and has a surface whose L in the Lab display is known and L Is divided into two parts, that is, a part of 45 to 55 and a part of L is 98 to 105, and the evaluation window is provided in a place surrounded by the part of L to 45 to 55 without using a dedicated measuring instrument. Even if the exterior material is uneven, and the photographing environment such as sunshine is different, the numerical value of the color can be correctly obtained.

It is a front view of the correction tool used for the color numerical value inspection method of the exterior material which concerns on one Embodiment of this invention. It is explanatory drawing of the color numerical value inspection method of the exterior material. It is a graph which shows the relationship between white distribution and the outer wall L value of a correction tool. It is a block diagram which shows the hardware structural example of the color numerical value inspection apparatus used for the same color numerical value inspection method. It is a block diagram which shows the conceptual structure of the same color numerical inspection apparatus.

  An embodiment of the present invention will be described with reference to the drawings. This exterior color material inspection method includes a preparation process (S1) for preparing the correction tool 1 composed of the color card shown in FIGS. 1 and 2, and an overlap of the correction tool over the inspection location of the exterior material 4 to be inspected. In step (S2), in this overlapped state, a photographing step (S3) in which the surface of the correction tool 1 together with the surface of the exterior material 4 in the evaluation window 3 of the correction tool 1 is photographed by the digital photographing means 2, A color numerical value calculating step (S4) for correcting the color of the image G of the digital data and calculating the numerical value of the color of the exterior material 4. Note that the color correction of the image G is not necessarily performed. After the calculation of the numerical value of the color, determination of deterioration of the exterior material 4 is performed in a determination process (S5). The information processing means 5 performs the color value calculation process (S4) and the determination process (S5) such as deterioration.

  In many cases, the degree of deterioration of the exterior material 4 such as the outer wall is usually evaluated by the color difference ΔE, but ΔE is often determined by ΔL (change in brightness) in Lab. In camera shooting, the factor that determines the “brightness” of the subject is “exposure”. Focusing on this, the correction tool is used as means for realizing shooting with high accuracy and high reproducibility. The color values are not limited to being expressed in Lab, and the same applies to the case where they are expressed in RGB or CMKY.

The digital photographing means 2 is a means capable of photographing a color digital image, such as a digital camera (so-called digital camera), a mobile phone terminal having a camera function, another portable information processing terminal (PDA, tablet) or the like. Also good.
The information processing means 5 is a personal computer, a multifunctional mobile phone terminal such as a so-called smart phone, a PDA or a tablet-type mobile information processing terminal.

  The correction tool 1 is in the form of a face material, and as shown in FIG. 1, in this example, the surface of a horizontally long rectangular substrate 1A is divided into two parts, a gray portion 1a and a white portion 1b, each having a known numerical value of color. The color card is divided into upper and lower parts 1a and 1b, and an evaluation window 3 is provided at a location surrounded by the gray part 1a. On the surface of the correction tool 1, a photographing frame 6 indicating an appropriate range to be photographed at the time of photographing is provided by printing or the like. The gray portion 1a and the white portion 1b are not necessarily achromatic, but the gray portion 1a has L of 45 to 55, and the white portion 1b has L of 98 to 105.

More specifically, in the correction tool 1, the gray portion 1a is 18% gray, and the white portion 1b is white as close as possible to pure white. In terms of Lab display, the gray portion 1a is gray in which L is about 50 and white in which the lower portion is about L100.
18% gray is L = 50, a = 0, b = 0 in Lab display, but is not limited to this, for example, a red system such as L = 50, a = 50, b = 50 Intermediate colors in gray scale, such as blue ones such as L = 50, a = 0, b = 20, green ones such as L = 50, a = 30, b = 0 .

  As a material of the correction tool 1, a white material close to pure white is Kent paper. In this example, the gray portion 1a is provided with a studio gray tape, and the white portion 1b is provided with a Kent paper attached to the surface of the substrate 1A. The substrate 1A is made of a material that is elastic and does not bend, for example, a plastic plate. However, if the substrate 1A is too thick, a shadow is formed on the evaluation part in the evaluation window 3, and the thickness is about 0.5 mm. Things are appropriate. In addition to this, instead of providing the plastic substrate 1A, 18% gray tape may be attached to the Kent paper so that the Kent paper can be used as the substrate 1A and the white portion 1b.

  The evaluation window 3 is an opening for evaluating and photographing the exterior material 4 to be inspected, and is provided near the center of the correction tool 1. The evaluation window 3 is, for example, a rectangle having vertical and horizontal dimensions h and w of about 20 mm. If the size of the evaluation window 3 is too small, a gap is formed between the correction tool 1 and the exterior material 4 due to irregularities such as the outer wall that is the exterior material 4 to be inspected, and a shadow is formed on the evaluation site. This is not preferable because there is a possibility. On the other hand, if it is too large, the part of the exterior material 4 that is focused and specified in the field may be different from the evaluation part selected at the time of reproduction and correction of the photographed image, and the photographing area of the subject becomes large. A problem similar to that of the prior art occurs. As a method for solving this problem, there is a method of increasing the distance between the subject and the digital photographing means 2, but in this case, there is a problem that the resolution becomes coarse. The overall size of the correction tool 1 is, for example, about 150 to 300 mm in length and about 200 to 300 mm in width.

  The range H in the vertical direction indicated by the photographing frame 6 is set such that the range H1 including the gray portion 1a is 75 to 85% from the upper side, and the range H2 including the white portion 1b is the remaining 25 to 15%. The

  Next, each process (S1) to (S5) will be described. In the superimposing process (S2), the correction tool 1 is placed on the front surface of the exterior material 4 which is an existing outer wall that is vertically built, for example, the portion to be color-inspected, and the gray portion 1a on the upper side and the white on the lower side are white. Overlay to be part 1b. At this time, the overlapping is performed so that the portion to be inspected for the color numerical value enters the evaluation window 3. In the example of the figure, the exterior material 4 is provided with a joint pattern portion 4a having a concavo-convex pattern in a brick shape.

  In the photographing process (S3), the digital photographing means 2 photographs the correction tool 1 superimposed as described above so that the entire photographing frame 6 is just within the photographing range. FIG. 2C is a conceptual diagram of the photographed captured image G.

  In the color numerical value calculation step (S4), the numerical value of the color is calculated for the image of the exterior material 4 that is the image portion Ga corresponding to the evaluation window 3 in the captured image G from the captured image G thus captured. At this time, the color of the photographed image G, which is digital data, is compared with the numerical value of the known color of the correction tool 1 to correct the difference, and the evaluation window 3 of the exterior material 4 is corrected with the corrected value. The numerical value of the color of the inside is calculated.

  In the deterioration determination process (S5), the deterioration of the exterior material 4 is determined according to a predetermined rule from the color value of the exterior material 4 calculated in the color value calculation process (S4).

According to this method, since the correction tool 1 whose color value is known is photographed by the digital photographing means 2 together with the exterior material 4 in the evaluation window 3, the change in the environment during photographing such as sunlight and weather, Even if there is a difference in characteristics depending on the model of the photographing means 2, the color of the exterior material 2 is corrected by color-correcting the image of the exterior material 2 in accordance with the change in the color image of the portion of the correction tool 1 in the image. Can be color-corrected and digitized.
Since the periphery of the evaluation window 3 of the correction tool 1 is gray, photographing itself can be performed appropriately. That is, since the digital photographing means 2, that is, a so-called digital camera, generally has a characteristic that the photographing screen is averaged to 18% gray and is photographed. The surrounding colors were taken with colors close to nature. In this way, since the image is captured with a color closer to natural at the time of shooting, the numerical value of the color can be obtained with higher accuracy.

Further, the correction tool 1 is color-coded into two parts, a gray part 1a and a white part 1b, and the correction tool 1 is applied to the exterior material 2 so that the gray part 1a is located on the bright side of the surrounding environment. Therefore, the effect of light can be leveled even if the shooting environment is light and dark depending on the direction.
When the exterior wall 2 is an outer wall in a state where it is built, the gray portion 1a of the correction tool 1 is positioned on the upper side.
The upper part of the outer wall is strongly affected by sunlight and looks bright. On the other hand, the lower part appears darker than the upper part due to the influence of reflection from the ground. The correction tool 1 can level the influence of light by arranging the gray portion 1a in the upper portion and the white portion 1b in the lower portion so as to cancel out these influences.

  In order to level the effects of light received at the upper and lower portions of the outer wall surface with high accuracy, it is necessary to photograph so that the ratio of the gray portion 1a and the white portion 1b of the correction tool 1 becomes a fixed ratio. . In this regard, when the correction tool 1 is provided with the shooting frame 6, it is possible to take an image so that there is no variation in the shooting distribution of the gray portion 1a and the white portion 1b. Further, the presence of the photographing frame 6 can stabilize the photographing distance and improve the image quality and accuracy necessary to obtain the numerical value of the color.

  It should be noted that the lighting environment to be photographed often has a directionality or a bias even when inspecting the exterior material 2 in the production stage indoors as well as the outer wall in the built state. In this case, the effect of light can be leveled by overlaying the correction tool 1 on the exterior material 2 so that the gray portion is positioned on the bright side of the surrounding environment.

In the color numerical value calculation process (S4), for a photographed image, for example, commercially available image editing software or the like is used to select a range to be evaluated, and an average Lab of the selected range is read to know the numerical value of the color. be able to. Alternatively, a method may be used in which a known 18% gray portion of the numerical value of the color is selected as a range, the average Lab of the selected range is read, and the difference is compared with the known Lab. In this way, even when the shooting environment such as sunshine is different, it is possible to correctly perform color digitization.

  In the deterioration determination step (S5), for example, brightness, saturation difference, and color difference are obtained from an initial Lab prepared in advance and a Lab obtained from an image photographed by the digital photographing means 2 in an actual building. In this way, by knowing the difference in the numerical values of the color such as brightness, saturation difference, color difference, etc., by comparing this with a prediction diagram of deterioration prepared in advance, the degree of deterioration of the exterior material, and the remainder Appropriate presentation of service life and maintenance time is possible.

  FIG. 3 shows the results of trials on a building built outdoors. The color of the exterior material 4 which is an outer wall is a kind of L value 82 and 63 in a color difference meter. Using the digital photographing means 2 which is a so-called digital camera of two companies of Company A and Company B, the L value was obtained from an image photographed while changing the ratio of the white portion 1b of the correction tool 1 in FIG.

Regardless of the outer wall color (even if the L value is 82 and 63), both Company A and Company B tend to have smaller (darker) L values as the proportion of the white portion 1b increases. If the L value of the color difference meter is a true value, the L value obtained from the digital camera image can be obtained by photographing the white portion 1b at a rate of 15 to 25% regardless of the camera manufacturer and the outer wall color. This indicates that the difference between the value and the true value is small, and the optimum range with a small error is obtained. For this reason, the appropriate range of the white portion 1b in the photographing frame 6 is 15 to 25% as described above.
From this figure, the L value of the white portion 1b of 0% is different from the present invention because there are few differences depending on the camera, but the correction tool 1 in FIG. 3), an approximate straight line equation as shown in FIG. 3 is prepared for each camera, and a correction can be made by setting a (correct) color in the case of a white distribution of about 15%.

The effects of the color numerical value inspection method of the above embodiment are summarized below.
It becomes possible to know the remaining life of the exterior material 4 such as the outer wall.
The remaining life diagnosis of the exterior material 4 made of a roof material can also be used using the same principle.
-The color of the exterior material 4 such as an outer wall including multiple colors can be quantified.
・ A general-purpose digital camera can be used to diagnose the remaining life at low cost.
・ Diagnosis can be made by a method close to the conventional method without taking time.
・ Diagnosis equipment can be reduced.
-By presenting to the user as the remaining life, it becomes possible to explain the degree of danger and urgency to the user in an easy-to-understand manner.
-Appropriate presentation of maintenance time for exterior materials such as outer walls becomes possible.
・ Use as a sales tool for maintenance work orders.
-By linking with devices such as personal computers, it is possible to present diagnostic results on the spot immediately after inspection.
・ In addition to diagnosing deterioration, quality control can be performed using the same method as described above at the site of construction and production.

Next, a color numerical value inspection apparatus for an exterior material will be described with reference to FIGS.
In FIG. 4, the information processing means 5 is a form terminal such as a personal computer or a smartphone or a tablet terminal. The information processing means 5 has a CPU (central processing unit) 15, a storage means 16, and an input / output port 17. A color numerical value inspection program 19 is stored in the storage means 16 and installed in a state that can be executed by the information processing apparatus 5. The storage means 16 collectively shows a large-capacity storage device such as a hard disk or SSD and a memory. The storage means 16 stores an OS (operation program) (not shown), and is provided with a data storage area 16a for storing data such as image data. The color value inspection program 19 is an application program executed on the OS.

  In addition, an input device 21 such as a keyboard, a mouse, and a touch panel and a screen display device 22 which is an output device capable of displaying an image such as a liquid crystal display device are connected via the input / output port 17. The input / output port 17 has an interface such as a USB standard, and an image photographed by the digital photographing means 2 is input to the information processing apparatus 5 through the input / output port 17, for example. The image photographed by the digital photographing means 2 may be stored in a removable memory chip (not shown) and input to the information processing device 3 from the memory chip.

  The color numerical value inspection program 19 and the hardware of the information processing means 5 constitute an input processing means 31, a color correction means 32, a color numerical value inspection means 33, and an output processing means 34. The input processing means 31 is a predetermined storage area of the storage means 16 from the digital photography means 2 for a color image of digital data obtained by photographing the exterior material 4 to be subjected to the color numerical inspection and the known color body 1 together. It is a means to memorize | store in 16a. The color correction means 32 and the color numerical value inspection means 33 are respectively a part of the color numerical value calculation process (S4) described above with reference to FIG. 1 and a process of calculating a color numerical value based on the value after color correction. It is a means for performing processing. The output processing means 34 is a means for displaying the processing results in the color value calculation process (S4) and the determination process (S5) on the screen of the screen display device 22.

DESCRIPTION OF SYMBOLS 1 ... Correction tool 2 ... Digital imaging | photography means 3 ... Evaluation window 4 ... Exterior material 5 ... Information processing means 6 ... Shooting frame

Claims (5)

The surface is formed into a face material, and the surface is color-coded into two parts, L in the Lab display, where L is 45 to 55 and L is 98 to 105, and L is 45 to 55. A preparation process for preparing a correction tool having an evaluation window in a place surrounded by
Overlaying the correction tool on the exterior material so that the evaluation window is located at the inspection location of the exterior material to be inspected and the portion where L is 45 to 55 is located on the bright side of the surrounding environment Process,
A photographing process of photographing the surface of the correction tool together with the surface of the exterior material in the evaluation window with a digital photographing means in a state where the correction tool is overlaid,
From the color of the image of the captured digital data, a color numerical value calculation process for calculating the numerical value of the color of the portion in the evaluation window of the exterior material,
Method for color numerical inspection of exterior materials including   2. The color value inspection method for an exterior material according to claim 1, wherein the exterior material is an outer wall in a built state, and the L of the correction tool is set to 45 to 55 in the overlapping process and the imaging process. A method for inspecting the numerical values of the exterior material placed on the upper side.   3. The exterior color value inspection method according to claim 1, further comprising a deterioration determination step of determining deterioration of the exterior material from a numerical value of the color of the exterior material calculated in the color value calculation process. Color numerical inspection method for exterior materials.   4. The color value inspection method for an exterior material according to claim 1, wherein the correction tool is configured such that the upper part is gray with L of about 50 and the lower part is white with L of about 100, A method for inspecting a color value of an exterior material in which a photographing frame indicating a photographing range is provided on a surface of a correction tool, and a ratio of the white portion in the photographing frame is 15 to 25% with respect to the entire surface of the correction tool.   A correction tool used in a method for inspecting a color value of an exterior material, wherein the surface is formed in a face material shape, and the surface has a known L in Lab display, a portion of L of 45 to 55, and a portion of L of 98 to 105, respectively. A correction tool for color value inspection of an exterior material, characterized in that an evaluation window is provided at a location where the L is surrounded by the portions of 45 to 55.

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