JP4897987B2 - Tint measurement system - Google Patents

Description

  The present invention relates to a hue measurement system capable of determining and inspecting the hue of industrial products such as clothing, food colors such as human skin color and beef.

When adjusting and inspecting the color of industrial products such as clothing in factories, it is difficult to reproduce the same color and clarify the criteria for judging the hue of the appearance of multiple people using words and color charts. is there. Inspectors, when performing inspections, different locations may result in different results. In addition, things that are color swatches may become discolored as they become old.
Therefore, in order to maintain stable product quality at any time, it is necessary to measure and digitize the color so that everyone can reproduce the color in the same way, and to transmit and store it. .

  As a technique for measuring and digitizing (coloring) the color, color measurement is performed for the RGB, hue, saturation, and brightness color systems that make up the color of the inspection product, and the average value of the entire inspection area is taken. It is known to compare with a color measurement of a reference product. (For example, Patent Document 1)

  The hue measurement method disclosed in Patent Document 1 is a process for inspecting the hue of an inspection object based on an inspection area and color elements in a color image obtained by a camera for hue inspection of industrial products, agricultural products, and the like. Specifically, the color data (RGB) is converted into the CIELab color system, and the average value of L *, a *, and b * is obtained for the entire inspection area, and this average value is the color measurement of the reference product. A method is used in which the quality of the color is determined based on whether the value is within an allowable range determined from the value. The average value of the entire pixel is obtained from the color image, and one color is determined in the Lab color space, and this is compared with a reference color prepared in advance to determine whether or not the color of the inspection product is the same. Is what you do.

JP-A-9-203664

  In the conventional color measurement method, for example, clothing to be color-inspected is carried by a conveyor belt, a color image is acquired from above by a camera, and the color of the inspection area in the color image is converted into data, and the reference color data and In comparison, it is determined whether or not the color of the inspection product is the same.

  However, in the color inspection of clothes, etc., when a color image is simply acquired with a camera etc. from above according to the texture direction and material of the fabric, and color information is converted into data, the color seen by the human eye and the inspection Thus, an error between the color determined by the color code increases and accurate color inspection becomes difficult.

  When viewed with the human eye, the object is viewed from various angles to determine whether the colors are the same. In order to determine the color, it is recommended that the object is observed from an angle of 45 degrees instead of looking directly from above (this is a JIS object measurement standard). However, in the case of an apparatus in which a color inspection object is transported by a transport belt or the like and is photographed by a camera, if the observation object has a three-dimensional shape, it is difficult to align the camera. Even if the object to be observed is a plane such as a cloth, there are some irregularities, and there is also a problem of camera alignment.

  Therefore, the present invention has been made to solve such problems, and is a hue that enables a slight hue judgment based on the texture direction angle of the fabric and the difference in surface properties regardless of the light environment. An object is to provide a measurement system.

In order to achieve the above object, a hue measurement system according to the present invention includes a mirror cylindrical body in which an object to be photographed is placed immediately below the central axis of the cylinder and at least a part of the inner wall surface of the cylinder is a mirror surface, and the object , A camera equipped with a fisheye lens arranged so that the lens optical axis coincides with the cylindrical central axis of the mirror cylindrical body, and an image recording means for recording an image obtained via the fisheye lens, and the mirror cylindrical body A color chart, a color chart illuminating means for illuminating the color chart, an object illuminating means for illuminating the object, an image of the color chart photographed and recorded simultaneously by the image recording means of the camera, and a mirror cylindrical body a system comprising a color image analysis means for comparing analysis of color images from the reflection image of the object that crowded reflection of the mirror surface of the inner wall, the height of the mirror cylinder body, of the bottom surface It is the same or an integer multiple of.

  According to the above configuration, the fish-eye lens can shoot an image of the entire viewing angle radially around the lens optical axis, and the color image of the color chart arranged inside the mirror cylindrical body and the mirror surface of the side inner wall of the mirror cylindrical body It is possible to take a picture together with the object being reflected. Due to the nature of the cylindrical mirror surface, this reflected image is an image that is seen from an omnidirectional viewpoint that surrounds the object, and a color image from an omnidirectional viewpoint is obtained by taking the reflected image. Can be obtained at once. In addition, by using a fisheye lens, there is no need for focusing, and there is a feature that even a color image from a different viewpoint can be obtained clearly.

That is, it is possible to easily acquire color information obtained by observing an object with a camera from an oblique angle of 45 degrees, which is said to be suitable for judging a color, and in the same way as in the case where the object is viewed with human eyes. By looking at the object from various angles, it will be possible to determine whether the hue is the same. Note that, even in the JIS target measurement standard, when measuring a color, the object is observed from an angle of 45 degrees.
Further, since color images from omnidirectional viewpoints can be obtained at a time, it is not necessary to position the camera. This is because all directions are possible at an angle of 45 degrees, or all directions are possible at other angles.

  In the above-described color measurement system of the present invention, it is preferable to further provide a black curtain sheet that partially covers the inner wall of the mirror surface cylindrical body. By making at least a part of the inner wall surface of the cylinder as a mirror surface as described above, a color image from an omnidirectional viewpoint is captured with a fisheye lens at an angle of about 45 degrees. At this time, the inner wall surface of the portion other than the mirror surface A black curtain sheet is provided so as to partially cover the inner wall of the mirror surface cylindrical body so as not to capture the image. In other words, in order to compare the color chart image with the image observed only from the vicinity of 45 degrees obliquely, by providing a black curtain sheet that partially covers the inner wall of the mirror surface cylindrical body, the optimum according to the shape of the object An image taken from an angle can be compared with a color chart, and the accuracy of the color contrast can be improved.

In the above-described hue measurement system of the present invention, the reason why the height of the mirror cylinder is the same as or an integral multiple of the inner diameter of the bottom surface will be described below . There may be a plurality of reflected images of the object reflected on the mirror surface of the inner wall of the side surface of the mirror cylindrical body, that is, a so-called one-time reflected image reflected once by the mirror surface and captured by the fisheye lens, twice on the mirror surface. There can be a so-called n-time reflected image reflected n times (n is a natural number) on the mirror surface and captured by the fish-eye lens, such as a so-called twice reflected image reflected and captured by the fish-eye lens.
Here, an image obtained by observing an object from an oblique angle of 45 degrees, which is said to be suitable for judging the color, by making the height of the mirror-cylindrical body the same as or an integral multiple of the diameter of the bottom surface, It is possible to shoot with the camera via

  In the above-described hue measurement system of the present invention, the color chart and the object illumination unit are held by the transparent plate provided on the mirror cylindrical body, and the color chart is disposed so as to face the fisheye lens, and the hue determination is performed. Object illumination means is arranged to face the object to be performed. The color chart is illuminated by a color chart illumination device that illuminates the color chart from a 45 degree direction.

  In the color measurement system of the present invention described above, the color chart is arranged in a donut shape on the inner wall of the bottom surface of the mirror cylindrical body, and the color chart is arranged in a band shape on a part of the inner wall surface of the mirror cylindrical body. There is something that is set up. In order to simultaneously capture a color chart image and a reflection image of an object reflected on the mirror surface of the inner wall of the mirror cylindrical body, the arrangement and shape of the color chart are taken into consideration. Details will be described in detail in Examples described later.

Furthermore, in the above-described hue measurement system of the present invention, the color image analysis means is provided in a computer server connected via a wired or wireless communication network. When the color image analysis means is provided in the computer server connected via the communication network, the information on the hue determination result can be stored in the computer server, and the determination processing logic program is upgraded. There is convenience. As an application example, it is conceivable to capture an image of an object including a color chart, send it to an analysis center via a communication network, and return the analysis result to a terminal such as a portable terminal.
The hue measurement system is separated into a hue determination terminal and a computer server that performs color image analysis, and the hue measurement terminal and the computer server transmit and receive data via a communication network. Instead of the need for color image analysis means, the hue determination terminal is newly provided with communication means.

  In the hue measurement system according to the present invention, a fish-eye lens can shoot an image of the entire viewing angle radially around the lens optical axis, and the color chart color image arranged inside the mirror cylindrical body and the side inner wall of the mirror cylindrical body It is suitable for judging the color because it can acquire the color image of the object from the omni-directional viewpoint at once by taking the reflected image of the object reflected on the mirror surface of Color information obtained by observing an object with a camera at an angle of 45 degrees, which is said to be present, can be easily acquired. It is possible to determine whether or not the same.

  Hereinafter, embodiments of the hue measurement system of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to the specific applications, shapes and dimensions shown in the following examples.

  An example of the hue measurement system of the present invention according to Example 1 will be described below. FIG. 1 is a diagram schematically illustrating a basic configuration of a hue measurement system 1 according to the first embodiment.

  The object 4 to be judged for hue is, for example, clothes of industrial products, human skin, meat, etc., and by evaluating the hue, let's evaluate the quality of the product, the condition of the human skin, the freshness of the meat, etc. It is a thing of the object.

  The mirror cylindrical body 2 has a cylindrical shape with a perfect cross section, and its inner wall surface is a mirror surface. The mirror surface cylindrical body referred to in the present invention refers to a cylindrical body whose inner wall surface is cylindrical and has a mirror surface. The outer wall surface of the cylindrical body does not necessarily have to be cylindrical and does not have to be a mirror surface. For example, the outer shape is a quadrangular prism and is made of a plastic material, but includes a cylindrical hollow on the inside and a mirror surface on the inner wall.

  The camera 3 includes a fisheye lens 31 and image recording means 32. The fisheye lens 31 faces the object 4 and is arranged so that the lens optical axis coincides with the cylindrical central axis of the specular cylindrical body 2. In this example, the fisheye lens 31 is disposed on the upper surface of the mirror cylindrical body 2 and is installed downward so as to face the object 4. The central axis (lens optical axis) of the fisheye lens 31 is arranged so as to coincide with the central axis (cylindrical central axis) of the cylindrical mirror body 2.

  The image recording means 32 is not particularly limited as long as it can record an image obtained through the fisheye lens 31, and may be a so-called analog image recording means for exposing and recording on an analog film, and a light receiving element such as a CCD (Charge Coupled Device). It is also possible to use so-called digital recording means for receiving light and recording as digital data. As an example, the image recording unit 32 is a digital image recording unit.

  The illuminating means 5 is disposed on the central axis of the mirror cylindrical body 2 and illuminates the object 4 so as to face the object 4. Here, the illumination means is gripped by a transparent plate (not shown) provided on the inner wall of the mirror cylindrical body 2.

The color chart 6 is provided above the illuminating means 5 and is configured so that a color image of the color chart 6 can be taken directly from the camera 3. The color chart 6 is obtained by collecting the color elements of the reference color in a fan-shaped block shape in accordance with the color of the object whose hue is to be determined, and making it an annular shape.

The color image analyzing means 7 receives the two-dimensional color image photographed by the camera 3, and the reflection image equivalent to the obtained color image of the color chart 6 and the image of the object 4 photographed from a predetermined angle direction. Are identified, the color is identified, and the hue of the object 4 is determined.
By comparing the color of the object at an oblique angle of approximately 45 degrees with the reference color of the color chart 6, the color of the object 4 is identified, and the quality of the hue is determined based on whether or not it is within the allowable range. It goes.

  The partition plate 8 is located on the bottom surface of the mirror surface cylindrical body 2. The partition plate 8 has a circular hole so that the camera 3 can photograph the object 4 from the hole. The shape of the hole may be rectangular instead of circular.

  In the hue measurement system 1 of the present invention, at least two images of the image of the color chart 6 and the reflected image of the object 4 are obtained by one photographing. Here, the reflection image is an image obtained by receiving a light beam reflected from the object 4 on the inner wall mirror surface of the mirror cylindrical body 2 and incident on the fisheye lens 31, that is, the inner wall of the mirror cylinder 2 from the viewpoint of the fisheye lens 31. It means a reflection image of the object 4 reflected on the mirror surface. The reflected image is reflected once on the inner wall mirror surface of the mirror surface cylindrical body 2 and incident on the fisheye lens 31, and reflected twice on the inner wall mirror surface of the mirror surface cylindrical body 2 and incident on the fisheye lens 31 twice. This includes images obtained by reflection many times, such as the reflected image R2. Therefore, what is reflected n times (n is a natural number) on the inner wall mirror surface of the mirror cylindrical body 2 and enters the fisheye lens 31 is an n-time reflected image Rn.

FIG. 2 is a diagram schematically showing, in a vertical section of the hue measuring system 1, how the image of the color chart 6 and the reflected image of the object 4 are received by the camera 3. As shown in FIG. In FIG. 2, attention is paid only to a point A on the surface of the object. Light that is emitted from the point A, reflected once on the inner wall mirror surface of the mirror cylindrical body 2 and incident on the fisheye lens 3 is an optical path A1 that forms a reflected image once. Light emitted from the point A, reflected twice on the inner wall mirror surface of the mirror cylindrical body 2 and incident on the fisheye lens 31 is an optical path A2 that forms a reflected image twice.
Although there are optical paths that reflect three or more times, FIG. 2 shows the optical path A2 that reflects twice, and the illustration of the optical paths beyond that is omitted. Further, FIG. 2 shows the optical path focusing only on the point A, but light emitted from all points on the surface of the hue determination object enters the fisheye lens 31 according to the same principle as in FIG.

FIG. 3 is a diagram schematically showing an image obtained by photographing an object for hue determination with the camera 3. The image seen at the center in FIG. 3 is the image C of the color chart 6. In FIG. 3, the circle surrounding the image C of the color chart 6 is the edge E of the mirror cylindrical body 2. Next, the outer ring-shaped object surrounding the edge E is a one-time reflected image R1 of the object reflected on the inner wall mirror surface of the mirror cylindrical body 2. The object is reflected in a form that goes around the inner wall mirror surface of the mirror cylindrical body 2.
In the hue measurement system 1 of the present invention, the image C of the color chart 6 and the image R1 of the reflection image of the object 4 can be obtained by one shooting as described above.

  FIG. 4A shows an optical path constituting a one-time reflected image of the measurement object. FIG. 4B shows an optical path constituting a twice reflected image of the measurement object. In FIG. 4A, the photographing viewpoint of the object 4 in the one-time reflected image is equivalent to a photographed image that would be obtained by photographing with a virtual fisheye lens indicated by a broken line. Similarly, in FIG. 4B, it is shown that the photographing viewpoint of the object 4 in the twice reflected image is equivalent to a photographed image that would be obtained by photographing with a virtual fisheye lens indicated by a broken line. .

Here, assuming that the inner diameter (radius) of the mirror cylindrical body 2 is L / 2, in the case of FIG. 4A, the photographing viewpoint is located at a distance L from the fisheye lens, and in the case of FIG. 4B, the photographing viewpoint is the fisheye lens. 2L away.
If the height of the mirror-cylindrical cylinder 2 is L, the image in the one-time reflection image is equivalent to an image that would be obtained from a camera in which the object 4 is taken from a shooting viewpoint from an angle of 45 degrees. is there.

Since the above description using FIG. 4 is established between all the points on the surface of the object 4 and the inner wall mirror surface of the mirror cylinder 2 facing each other, the inner wall mirror surface of the mirror cylinder 2 shown in FIG. The once reflected image R1 reflected in the image is equivalent to an image collected by photographing the object 1 while moving the virtual camera 3 ′ around the circumference of the radius L around the circumference of the radius L around the center axis of the cylinder. It has become an image.
Similarly, the twice-reflection image R2 is obtained by shooting the object 4 while moving the virtual camera 3 ″ around the circumference of the radius 2L around the circumference of the cylinder center axis with the center axis of rotation as the center of rotation. The image is equivalent to an image obtained by collecting only images.

  That is, the image C of the color chart 6 obtained by the hue measurement system 1 of the present invention, the reflected image R1 and the reflected image R2 of the object 4 are added to the direct image from the actual viewpoint F0 where the fisheye lens 31 is disposed, It includes an image shot from the shooting viewpoint of a camera that would be arranged to surround the circumference separated from the central axis of the cylinder by a radius L and the circumference separated by a radius of 2L.

  Further, by setting the height of the mirror cylindrical body 2 to L, an image of the point A in the once-reflection image R1 will be obtained from a camera in which the object 4 is taken at a shooting viewpoint from an oblique angle of 45 degrees. Equivalent to the image of point A. Therefore, an image obtained by observing an object from an oblique angle of 45 degrees, which is said to be suitable for determining a color, can be photographed by a camera via a fisheye lens.

  The above is the case where the height of the mirror cylinder 2 is the same as the diameter L of the bottom surface of the mirror cylinder 2, but the height of the mirror cylinder 2 is an integral multiple of the diameter of the bottom surface of the mirror cylinder 2. May be. For example, when the height of the mirror surface cylindrical body 2 is twice the diameter of the bottom surface of the mirror surface cylindrical body 2, the image of the point A in the twice reflected image R2 captures the object 4 from an angle of 45 degrees. This is equivalent to an image of point A that would be obtained from a camera at the viewpoint.

Next, an example of the hue measurement system of the present invention according to Example 2 will be described below. FIG. 5 is a diagram schematically illustrating the basic configuration of the hue measurement system 1 according to the second embodiment.
In the second embodiment, the position and shape of the color chart 6 are different from those of the first embodiment. In the second embodiment, as shown in FIG. 5, the color chart 6 is disposed at the partition plate 8 in the first embodiment. By arranging the color chart 6 at the location of the partition plate 8, it becomes possible to match the illumination environment of the object 4 to be photographed from the hole of the partition plate and the illumination environment of the color chart 6. Moreover, although the illumination means 5 is arrange | positioned on the cylinder central axis in FIG. 5, it can also be arrange | positioned beside the camera 3. FIG.

  FIG. 6 is a diagram schematically showing an image obtained by photographing the object for hue determination with the camera 3. In FIG. 6, the image that looks like the innermost ring is the image C of the color chart 6. In FIG. 6, the outer circle surrounding the image C of the color chart 6 is the edge E of the mirror cylindrical body 2. The outer ring surrounding the edge E is a one-time reflection image R1 of the object reflected on the inner wall mirror surface of the mirror cylindrical body 2, and is the same as in the first embodiment.

Next, an example of the hue measurement system of the present invention according to Example 3 will be described below. FIG. 7 is a diagram schematically illustrating the basic configuration of the hue measurement system 1 according to the third embodiment.
In the third embodiment, the positions and shapes of the color chart 6 and the first embodiment are different. In the third embodiment, as shown in FIG. 7, the color chart 6 is arranged on the inner wall of the mirror cylindrical body 2.

Next, an example of the hue measurement system of the present invention according to Example 4 will be described below. FIG. 8 is a diagram schematically illustrating the basic configuration of the hue measurement system 1 according to the fourth embodiment.
In the fourth embodiment, compared with the second embodiment, the position of the camera 3 and the position of the illumination means 5 are interchanged. The camera 3 is positioned between the illumination means 5 and the object 4, and direct light from the illumination means 5 does not reach the object 4, but the reflected light of the illumination means 5 is reflected by the inner wall mirror surface of the mirror cylindrical body 2. The image can be captured by reaching the object 4. In FIG. 8, the color image analyzing means 7 is not shown (omitted).

Next, an example of the hue measurement system of the present invention according to Example 5 will be described below. FIG. 9 is a diagram schematically illustrating a configuration of a hue measurement system according to the fifth embodiment.
In the fifth embodiment, the color image analyzing means 7 in the first embodiment is provided in a computer server 10 connected via a wireless communication network 11.

FIG. 10A shows an experimental apparatus for the hue measurement system of the present invention. The mirror is provided in a partial area in the cylinder, as shown by hatching in the figure. A white LED is used as the illumination means. The HC-300Z made by FUJIFILM is used for the CCD camera. The photographed image is shown in FIG. It can be seen that the photographed image has an observation direction of 45 degrees suitable for hue measurement and is obtained from all directions of the object to be measured. In this example, the installation of a color chart is omitted.
Further, the results of measurement using this experimental apparatus with a plain weave fabric as shown in FIG. 11 as a measurement object (relationship of hue by observation direction angle, relationship of saturation by observation direction angle, relationship of brightness by observation direction angle) ) Is shown in the graphs of FIGS.
On the surface of the plain weave cloth that is the object to be measured, the reflection intensity in each reflection direction of the reflected light changes due to slight surface irregularities caused by the intersection of the threads, and as a result, the hue that is the color measurement result for each observation direction , Saturation and lightness are changing. It has been measured that the hue changes in FIG. 12 and the saturation in FIG. 13 slightly changes depending on the viewing direction. In FIG. 14, the measurement result of the brightness is similarly shown, but in the case of this example, a large difference was not recognized depending on the observation direction. Measurement sensitivity also varies depending on the signal processing method. For example, in FIGS. 12 and 13, the change in sensitivity due to the difference in the method of white balance adjustment (hereinafter also referred to as WB in the drawings) to be adjusted between the camera and the illumination light source is significant. . In this example, the annular hue determination image is not divided in the radial direction (in the figure, one division), and is divided into five regions each divided into two large and small regions around the 45 ° direction of the observation angle ( In the figure, 5 divisions) are compared. Even when the image was not divided, a slight change in hue that occurred on the fabric surface could be measured. However, when the number of divisions is large, the effect of removing the effects of uneven illumination of the illumination light source is great, and this occurs on the fabric surface. A slight change in hue can be measured with high sensitivity. In FIG. 14, the measurement result of the brightness is similarly shown, but in the case of this example, a large difference was not recognized depending on the observation direction.

  The hue measurement system according to the present invention is useful for a hue inspection apparatus for industrial products such as clothing, a human skin color condition check apparatus, and crop color management.

It is the figure which showed typically the basic composition of the hue measurement system which concerns on Example 1 ((a), (b)). In the hue measurement system according to Example 1, the light received by the camera is schematically represented in the longitudinal section of the hue measurement system. FIG. 3 is a diagram schematically illustrating an image obtained by photographing with a camera in the hue measurement system according to the first embodiment. It is the figure which showed typically a mode that the imaging | photography viewpoint of the (a) once reflected image with respect to a target object, (b) the twice reflected image with respect to a target object was expand | deployed equivalently. It is the figure which showed typically the basic composition of the hue measuring system which concerns on Example 2. FIG. FIG. 6 is a diagram schematically illustrating an image obtained by photographing with a camera in the hue measurement system according to the second embodiment. It is the figure which showed typically the basic composition of the hue measuring system which concerns on Example 3. FIG. It is the figure which showed typically the basic composition of the hue measuring system which concerns on Example 4. FIG. It is the figure which showed typically the structure of the hue measuring system which concerns on Example 5. FIG. (A) shows the experimental apparatus of the hue measuring system of the present invention according to Example 6, and (b) shows an image taken with this experimental apparatus. Appearance of plain weave fabric Graph showing the relationship between viewing direction angle and hue change Graph showing the relationship between viewing direction angle and saturation change Graph showing the relationship between viewing direction angle and brightness change

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Color measurement system 2 Mirror surface cylindrical body 3 Camera 4 Object 5 Illumination means 6 Color chart 7 Color image analysis means 8 Partition plate 9 Communication means 10 Computer server 11 Communication network 21 Inner mirror 22 Dark curtain sheet 31 Fisheye lens 32 Image recording means 51 Object Light source for object illumination 52 Light source for color chart illumination

Claims (7)

An object for hue determination is placed directly below the central axis of the cylinder, and a mirror cylindrical body having at least a part of the inner wall surface of the cylinder as a mirror surface, a cylinder facing the object, and a lens optical axis of the cylinder of the mirror cylindrical body A fisheye lens arranged so as to coincide with a central axis, a camera including an image recording means for recording an image obtained via the fisheye lens, a color chart arranged inside the mirror cylinder, and Color chart illuminating means for illuminating the color chart, object illuminating means for illuminating the object, the image of the color chart photographed simultaneously by the image recording means of the camera, and the mirror surface of the mirror cylindrical body A color image analysis means for comparing and analyzing a color image from the reflected image of the object ,
A hue measuring system , wherein the height of the mirror cylinder is equal to or an integral multiple of the inner diameter of the bottom surface .   2. The hue measuring system according to claim 1, further comprising a black curtain sheet that partially covers an inner wall of the mirror cylindrical body. The fisheye lens, the color chart, the object illuminating means, and the object are all arranged in order from the top along the cylindrical central axis of a mirror cylindrical body, and the color chart is disposed facing the fisheye lens, The hue determination system according to claim 1 , wherein the object illumination unit is disposed to face the object. The color determination system according to claim 1 , wherein the color chart and the object illumination unit are held by a transparent plate provided in the mirror surface cylindrical body. The color measurement system according to claim 1 , wherein the color chart is arranged in a donut shape on an inner wall of a bottom surface of the mirror cylindrical body. The color measurement system according to claim 1 , wherein the color chart is disposed in a band shape on a part of the inner wall surface of the mirror cylindrical body. The color measurement system according to claim 1 , wherein the color image analysis means is provided in a computer server connected via a wired or wireless communication network.