JP2012002704A - Method for evaluating appearance color texture, device for evaluating appearance color texture and system for evaluating appearance color texture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for evaluating appearance color texture capable of objectively evaluating texture, a device for evaluating appearance color texture and a system for evaluating appearance color texture.SOLUTION: The method for evaluating appearance color texture comprises steps of: forming a coordinate space having at least two of brightness difference, chroma difference, and hue difference as coordinate axe; measuring colorimetrically attributes of a plurality of colors on a coated plate being an evaluation object in correspondence to a plurality of predetermined angles; calculating a measured brightness difference, a measured chroma difference, and a measured hue difference based on the attributes of respective measured colors; determining the position of an evaluation object plot in the coordinate space based on the measured brightness difference, the measured chroma difference, and the measured hue difference calculated respectively; drawing the evaluation object plot at the determined position in the coordinate space and displaying the coordinate space where the evaluation object plot is drawn; and evaluating the appearance color texture of the coated plate based on the position of the evaluation object plot in the coordinate space.

Description

  The present invention relates to an appearance color texture evaluation method, an appearance color texture evaluation apparatus, and an appearance color texture evaluation system for evaluating the texture of appearance colors such as metallic and pearl paint colors.

  Conventionally, the appearance color texture is sometimes evaluated based on the brightness or brightness obtained by measuring the color of a paint plate corresponding to a plurality of predetermined angles using a multi-angle colorimeter.

  In addition, for the evaluation of the appearance color texture, the texture is divided into a micro texture that is felt when looking closer and a macro texture that is felt when viewed from a distance. There is a method that is performed by determining the strength of the texture based on the color designer evaluating and ranking the feeling intensity (see Patent Document 1).

  Further, the appearance color texture is evaluated by measuring the micro texture using a micro glitter measurement device, thereby obtaining an HG (Hi-light Graininess) value representing particle feeling and an HB (Hi-light) representing glitter feeling. (Brilliance) value, while measuring the macro texture using a multi-angle colorimeter, the brightness and saturation of the highlight side and the brightness and saturation of the face (front) are obtained. There is a method of visually and intuitively describing the value, HB value, highlight side brightness and saturation, and face brightness and saturation on a radar chart (see Patent Document 2).

JP 2003-279413 A JP 2004-271467 A

  However, when the texture is evaluated based on the luminance or brightness obtained by measuring the color of the painted plate, the evaluation index is only the brightness or brightness, so the amount of data is small and it is difficult to determine the texture. Furthermore, since the texture cannot be quantitatively grasped, the paint color cannot be specified between the paint manufacturer and the automobile manufacturer, or between the color designer of the automobile manufacturer and the person in charge of the factory line. However, there is a problem that the development of paint and the quality control of paint color are difficult.

  In the invention described in Patent Document 1, since the color designer performs sensory evaluation, the texture evaluation results lack objectivity.

  Moreover, since the invention described in Patent Document 2 uses a micro brightness measurement device that is a special equipment, it is difficult to perform general-purpose texture evaluation, and the obtained texture evaluation It is unclear how objective the results are.

  In addition, it is difficult to develop and evaluate the quality of metallic and pearl-based paint colors, especially when it is difficult for anyone to understand the texture numerically and visually. Regarding texture, not only there are individual differences, but also there are differences in the senses and language of countries and ethnicities, so it is necessary to create objective indicators.

  An object of the present invention is to provide an external color texture evaluation method, an external color texture evaluation apparatus, and an external color texture evaluation system that can objectively evaluate the texture.

  The present inventors have found an external color texture evaluation method, an external color texture evaluation apparatus, and an external color texture evaluation system that can objectively evaluate the texture, and have completed the present invention. In order to solve the above problems, the present invention provides the following means.

  (1) A generation step for generating a coordinate space having at least two of the lightness difference, saturation difference, and hue difference as coordinate axes, and a plurality of evaluation target painted plates to be evaluated corresponding to a plurality of predetermined angles A colorimetric step for measuring the color attribute of each color, and a colorimetric brightness difference, a colorimetric chroma difference, and a colorimetric hue difference based on each color attribute measured corresponding to the plurality of predetermined angles. A calculating step for calculating, a position determining step for determining the position of the evaluation target plot in the coordinate space based on the colorimetric brightness difference, the colorimetric chroma difference and the colorimetric hue difference calculated by the calculating step; and the position determination A step of drawing an evaluation target plot at a position in the coordinate space determined by the step, and displaying a coordinate space in which the evaluation target plot is drawn; Based on the position of the valence target plot, characterized in that it comprises a, an evaluation step of evaluating the external color texture of the evaluation target coated plate appearance color texture evaluation method.

  According to such a configuration of the present invention, the evaluation object plot for determining the positions of the colorimetric brightness difference, the colorimetric saturation difference, and the colorimetric hue difference obtained based on the color measurement of one evaluation object coating plate. Is drawn in the coordinate space, and the appearance color texture of the evaluation target painted plate is evaluated based on the position and distribution of the evaluation target plot in the coordinate space. Therefore, according to the present invention, the texture can be objectively evaluated.

  (2) The colorimetric lightness difference, the colorimetric chroma difference and the colorimetric hue difference calculated in the calculating step are a plurality of brightnesses and a plurality of chromas obtained based on a plurality of color attributes corresponding to the plurality of predetermined angles. A maximum brightness difference, a maximum saturation difference, and a maximum hue difference, which are differences between the maximum value and the minimum value, and a first predetermined angle and a second of the plurality of predetermined angles. A predetermined angle is selected and obtained based on a plurality of color attributes corresponding to the second predetermined angle, and brightness, saturation, and hue obtained based on the plurality of color attributes corresponding to the first predetermined angle. The external appearance according to (1), characterized in that it is one of a two-angle lightness difference, a two-angle saturation difference, and a two-angle hue difference that are differences between the brightness, saturation, and hue, respectively. Color texture evaluation method.

  According to such a configuration of the present invention, the evaluation object plot based on the maximum brightness difference, the maximum saturation difference, and the maximum hue difference, and the evaluation object plot based on the two-angle brightness difference, the two-angle saturation difference, and the two-angle hue difference Can be drawn in the coordinate space. Therefore, it can be properly used for various evaluation target painted plates.

  (3) In the display step, the color of the evaluation target plot is set to the color of the evaluation target painted plate measured at a reference angle among the plurality of predetermined angles. (1) or (2) The appearance color texture evaluation method described.

  According to such a configuration of the present invention, the evaluation target plot drawn in the coordinate space indicates the coating color of the evaluation target painted plate at the reference angle, so that it is easy to grasp the coating color.

  (4) a setting step of setting an arbitrary region in the coordinate space; and an association step of associating the region set in the setting step with a texture language representing a texture, wherein the display step includes the step of When a texture language is selected, an area corresponding to the selected texture language is displayed in the coordinate space in which the evaluation target plot is drawn. Any one of (1) to (3) The appearance color texture evaluation method according to claim 1.

  According to such a configuration of the present invention, since an arbitrary region in the coordinate space is associated with a texture language representing a texture, it is possible to specify an evaluation target plot that applies to the texture corresponding to the texture language.

  (5) An image display unit for displaying an image, and an input for inputting attributes of a plurality of colors obtained by measuring the color of an evaluation target paint plate to be evaluated corresponding to a plurality of predetermined angles. A colorimetric value database unit for storing information on colorimetric lightness difference, colorimetric chroma difference and colorimetric hue difference obtained based on the plurality of color attributes, brightness difference, chroma difference and hue difference A texture language region database unit that stores correspondence information in which a region set in a coordinate space having at least two of the coordinate axes as a coordinate axis and a texture language representing a texture are associated with each other, and the coordinate space is displayed on the image display unit. Corresponding to each of the colorimetric lightness difference, the colorimetric chroma difference and the colorimetric hue difference based on each information of the colorimetric lightness difference, the colorimetric chroma difference and the colorimetric hue difference stored in the processing unit and the colorimetric value database unit Evaluate the position in the coordinate space A color difference display calculation unit that draws an elephant plot and draws the region in the coordinate space based on the correspondence information stored in the texture language region database unit. apparatus.

  According to such a configuration of the present invention, the evaluation object plot for determining the positions of the colorimetric brightness difference, the colorimetric saturation difference, and the colorimetric hue difference obtained based on the color measurement of one evaluation object coating plate. Is drawn in the coordinate space, and the appearance color texture of the evaluation target painted plate is evaluated based on the position and distribution of the evaluation target plot in the coordinate space. Therefore, according to the present invention, the texture can be objectively evaluated.

  (6) Colorimetric lightness difference, colorimetric chroma difference and colorimetric hue difference based on a plurality of color attributes obtained by measuring the evaluation target painted plate to be evaluated corresponding to a plurality of predetermined angles. Correspondence between the first database for storing each information of the above, the area set in the coordinate space having at least two of the brightness difference, the saturation difference, and the hue difference as coordinate axes, and the texture language expressing the texture A second database for storing information; an information processing apparatus for displaying the coordinate space; and a colorimetry based on information on a colorimetric brightness difference, a colorimetric chroma difference, and a colorimetric hue difference stored in the first database. An evaluation target plot is drawn at a position in the coordinate space corresponding to each of a lightness difference, a colorimetric chroma difference, and a colorimetric hue difference, and the region is defined based on the correspondence information stored in the second database. Characterized in that it comprises a color-difference display operation means for inscribing the space, the appearance color texture evaluation system.

  According to such a configuration of the present invention, the evaluation object plot for determining the positions of the colorimetric brightness difference, the colorimetric saturation difference, and the colorimetric hue difference obtained based on the color measurement of one evaluation object coating plate. Is drawn in the coordinate space, and the appearance color texture of the evaluation target painted plate is evaluated based on the position and distribution of the evaluation target plot in the coordinate space. Therefore, according to the present invention, the texture can be objectively evaluated.

  According to the present invention, the texture can be objectively evaluated.

It is a figure showing appearance color texture evaluation system 10 concerning one embodiment of the present invention. The texture space graph shown by the space constructed | assembled by making lightness difference, saturation difference, and hue difference into each coordinate axis is shown. It is a figure showing the position of the parameter | index plotted on a texture space graph when the paint color is solid color, metallic color, and pearl color. It is a flow explaining the flow of processing which displays a texture space graph. The texture space graph which shows the texture space graph shown by the space constructed | assembled by making the maximum brightness difference, the maximum saturation difference, and the maximum hue difference into each coordinate axis is shown. It is a flow explaining the flow of processing which creates a simulation image. It is a figure which shows an example of a simulation image. It is a figure which shows an example of the data reading image for producing | generating a simulation image. It is a flow explaining the flow of processing when creating a two-dimensional coordinate space. A ΔL * ΔC * plane on which a plurality of evaluation target plots are plotted is shown. A ΔL * Δh plane on which a plurality of evaluation target plots are plotted is shown. It is a flow explaining a language provision process. It is a figure shown about an example in the case of matching the texture language area | region in the texture space graph, and the word showing a texture. It is a flowchart of the process which displays a texture language area | region. It is a figure which shows the hardware constitutions of the information processing apparatus 500 which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described. This is merely an example, and the technical scope of the present invention is not limited to this. In some embodiments, the appearance color texture evaluation system according to the present invention typically shows that the paint color of an automobile is handled. However, the present invention is not limited to this, and the texture evaluation system for an appearance color including a paint color is not limited thereto. It is possible to operate as

  FIG. 1 is a diagram showing an appearance color texture evaluation system 10 according to an embodiment of the present invention. The appearance color texture evaluation system 10 includes a texture evaluation apparatus 20 as an information processing apparatus, a colorimetric value DB (database) 31 as a first database, a texture language area DB 32 as a second database, and a network 50. A digital multi-function peripheral 55, a user terminal 60, an electronic display device 65, and the like are included as appropriate.

  The texture evaluation apparatus 20 is preferably a computer device including digitized information input / output means, image display means, and color difference display calculation means described later. For example, the texture evaluation device 20 can be a computer device having a graphic display means such as a color monitor device, a keyboard, a mouse, a network interface that can be connected to a database server device, and the like.

  As will be described later, the colorimetric value DB 31 uses a multi-angle colorimeter (not shown) to measure a paint plate (evaluation target paint plate) to be evaluated corresponding to a plurality of predetermined angles. Stores information on brightness difference ΔL * (colorimetric brightness difference), saturation difference ΔC * (colorimetric saturation difference) and hue difference Δh (colorimetric hue difference) based on the attributes of multiple colors obtained by coloring. To do.

  As will be described later, the texture language area DB 32 displays areas set in a coordinate space (material space graph) having at least two of the lightness difference ΔL *, the saturation difference ΔC *, and the hue difference Δh as coordinate axes. Correspondence information corresponding to the texture language to be expressed is stored.

  The network 50 is a computer network in which the texture evaluation device 20, the colorimetric value DB 31, and the texture language area DB 32 can be connected to each other. The network 50 may be a local area network or a wide area network such as the Internet. The form of the network 50 may be anything such as wired or wireless.

  The digital multi-function peripheral 55 is an arbitrary component, and is preferably an input / output device having functions of a color scanner and a color printer. FIG. 1 shows a digital multi-function peripheral 55 having these functions in one housing. However, the present invention is not limited to this, and a single colorimeter, a single color printing machine, etc. It may be included in the evaluation system 10.

  The user terminal 60 is an arbitrary component, for example, a terminal device provided with a network interface that can be connected to the network 50. The electronic display device 65 is an arbitrary component, such as a large display device that can present images to a plurality of users.

  FIG. 1 shows an example in which the colorimetric value DB 31 and the texture language area DB 32 are connected to the texture evaluation apparatus 20 via the network 50, but these databases are directly connected to the texture evaluation apparatus 20. Or it may be built in. The form of these databases may be an independent server device or the like, or may be provided by appropriately dividing a magnetic storage medium or the like.

  Such an appearance color texture evaluation system 10 uses a texture space graph representing a texture in order to evaluate the texture of a metallic or pearl paint color. FIG. 2 shows a texture space graph represented by a space constructed with brightness difference, saturation difference and hue difference as coordinate axes. As shown in FIG. 2, the texture space graph is a coordinate space having the lightness difference ΔL *, the saturation difference ΔC *, and the hue difference Δh as coordinate axes. The texture space graph shows the positions corresponding to the lightness difference ΔL *, the saturation difference ΔC *, and the hue difference Δh based on a plurality of colorimetric values obtained by measuring the color of one coated plate. When drawn (plotted), the texture space graph shows one evaluation target plot (“black circle” shown in FIG. 2) at positions corresponding to the lightness difference ΔL *, saturation difference ΔC *, and hue difference Δh. Is placed. FIG. 2 shows a case where a plurality of evaluation target plots are drawn on the texture space graph based on the color measurement of a plurality of painted plates.

  There is a specific tendency corresponding to the paint color of the paint plate at the position of the evaluation target plot plotted on the texture space graph described above. FIG. 3 is a diagram showing the position of the evaluation target plot drawn on the texture space graph when the paint color is solid color, metallic color, and pearl color.

  When the paint color is a solid color, the evaluation target plot is plotted near the position 101 shown in FIG. When a multi-colored colorimeter measures colors corresponding to a plurality of predetermined angles, the colorimetric values corresponding to the plurality of predetermined angles are substantially the same. Therefore, all of the values of the lightness difference, the saturation difference, and the hue difference are close to 0 value, and the evaluation target plot is distributed in the corner of the texture space graph.

  When the paint color is a metallic color, the evaluation target plot is plotted near the position 102 shown in FIG. When the color of the metallic color is measured by a multi-angle colorimeter corresponding to a plurality of predetermined angles, the colorimetric values (particularly brightness) corresponding to the plurality of predetermined angles are different. Brightness difference increases. For this reason, when the paint color is metallic color, the evaluation target plot is plotted at a position where the brightness difference in the texture space graph is large.

  Furthermore, when the paint color is a pearl color, the evaluation target plot is plotted near the position 103 shown in FIG. The pearl color causes irregular reflection of light, so that the hue distribution range becomes large at the expense of less gloss. For this reason, when the paint color is a pearl color, the evaluation target plot is biased toward the coordinate axis representing the hue difference.

  In general, the basic texture of a metallic or pearl paint color is determined by the shading. The shading is a brightness of 15 ° or 25 °, generally called highlight among a plurality of predetermined angles (here, 15 °, 25 °, 45 °, 75 ° and 110 °), and the face (front). It is expressed from a 45 ° lightness called flip-flop value that is the difference between the two lightness values. When the flip-flop value is large, shading is increased. Then, in the case of a paint color with a large shading feeling, the evaluation target plot corresponding to the paint color is drawn at a position where the value on the coordinate axis of the brightness difference ΔL * is large in the texture space graph. Further, the greater the lightness difference ΔL *, the more glossy and more sparkling the paint color will be. Also, in the case of a pearl-based paint color in which light is irregularly reflected, the distribution range of the hue h becomes large instead of having a low glossiness. In this way, depending on the type of paint color, there is a tendency of how the evaluation target plot drawn in the texture space graph is distributed. That is, the plot position of the evaluation target plot in the texture space graph changes depending on the texture of the paint color.

  Next, the flow of processing for displaying the texture space graph on the image display means will be described. FIG. 4 is a flow for explaining the flow of processing for displaying the texture space graph. FIG. 5 shows a texture space graph represented by a space constructed with the maximum brightness difference, maximum saturation difference, and maximum hue difference as coordinate axes.

  In step ST100, a multi-angle colorimeter (not shown) measures the attributes of a plurality of colors on the painted plate to be evaluated corresponding to a plurality of predetermined angles. The attributes of the plurality of colors are, for example, lightness L *, chromaticity a *, and chromaticity b * in the L * a * b * color system. The multi-angle colorimeter, for example, makes light incident at an angle of −45 ° with respect to the paint plate, and a plurality of predetermined angles (for example, 15 °, 25 °, 45 °, 90 °, and 110) with respect to the paint plate. The colorimetric measurement may be performed based on receiving light at °).

  In step ST101, the texture evaluation device 20 inputs a plurality of color attributes (colorimetric values) from the multi-angle colorimeter.

  In step ST102, the texture evaluation apparatus 20 calculates a hue difference, brightness difference, and saturation difference for each two angles. That is, the texture evaluation apparatus 20 calculates a colorimetric brightness difference, a colorimetric chroma difference, and a colorimetric hue difference based on the attributes of each color measured corresponding to a plurality of predetermined angles.

Specifically, the texture evaluation apparatus 20 first determines the color of the L * C * h color system from the colorimetric values (lightness L *, chromaticity a * and chromaticity b *) input from the multi-angle colorimeter. The degree C * and the hue h are obtained. In this case, the saturation C * is obtained from the chromaticity a * and the chromaticity b * as shown in Equation 1. The hue h is obtained from the chromaticity a * and the chromaticity b * as shown in Equation 2.

  Next, the texture evaluation apparatus 20 selects a first predetermined angle and a second predetermined angle from a plurality of predetermined angles measured by the multi-angle colorimeter. Here, as the first predetermined angle and the second predetermined angle, a plurality of predetermined angles measured by a multi-angle colorimeter, for example, 15 °, 25 °, 45 °, 90 °, and 110 ° are used here. Different angles arbitrarily selected from the above. The texture evaluation apparatus 20 calculates the difference between the brightness obtained based on the color measurement result at the first predetermined angle and the brightness obtained based on the color measurement result at the second predetermined angle for each angle. Find as difference. Similarly, the texture evaluation device 20 calculates the difference between the saturation obtained based on the color measurement result at the first predetermined angle and the saturation obtained based on the color measurement result at the second predetermined angle. Obtained as the saturation difference for each two angles. In addition, the texture evaluation apparatus 20 calculates the difference between the hue obtained based on the color measurement result at the first predetermined angle and the hue obtained based on the color measurement result at the second predetermined angle for each two angles. Obtained as the hue difference.

  In step ST103, the texture evaluation apparatus 20 determines the maximum hue difference, the maximum brightness difference, and the maximum based on the result of color measurement corresponding to a plurality of predetermined angles (here, five angles) by the multi-angle colorimeter. Calculate the saturation difference. The maximum hue difference is the maximum and minimum values of hues obtained based on the results of color measurement corresponding to a plurality of predetermined angles (here, five angles) by a multi-angle colorimeter. The difference between Similarly, the maximum lightness difference is the maximum value of the lightness values obtained based on the results of color measurement corresponding to a plurality of predetermined angles (here, five angles) by a multi-angle colorimeter. This is the difference from the minimum value. The maximum saturation difference is the maximum value among the saturations obtained based on the results of color measurement corresponding to a plurality of predetermined angles (here, five angles) by a multi-angle colorimeter. And the minimum value.

  The processes in steps ST100 to ST103 described above are processes performed on one painted plate. Therefore, when there are a plurality of coated plates, the processes of steps ST100 to ST103 are performed on each of the plurality of painted plates.

  In step ST104, when a plurality of processes of step ST100 and step ST101 are performed, the texture evaluation apparatus 20 draws (plots) a texture on the texture space graph corresponding to the evaluation target plot (display coating). Plate).

  In step ST105, the texture evaluation apparatus 20 uses the hue difference (bi-angle hue difference) obtained in step ST102 as the colorimetric hue difference, colorimetric brightness difference, and colorimetric saturation difference for drawing the evaluation target plot in the texture space graph. The brightness difference (two-angle brightness difference) and the saturation difference (two-angle saturation difference) and the maximum hue difference, maximum brightness difference, and maximum saturation difference obtained in step ST103 are selected.

  In step ST <b> 106, the texture evaluation device 20 includes the two-angle hue difference, the two-angle lightness difference, and the two-angle saturation difference, the maximum hue difference, the maximum brightness difference, and the maximum saturation difference selected in step ST <b> 105. Based on one, a plot position for drawing the evaluation target plot in the texture space graph is calculated. The texture space graph is generated by the texture evaluation device 20 before the process of step ST100 is performed.

  In step ST107, the texture evaluation apparatus 20 (the color difference display calculation means constituting the texture evaluation apparatus 20) draws (plots) the plot position (evaluation target plot) calculated in step ST106 on the texture space graph (FIG. 2). And the texture space graph on which the evaluation target plot is drawn is displayed on the image display means. The evaluation target plot is represented by a sphere. In addition, the evaluation target plot may be set to the color of the painted plate measured at a reference angle among a plurality of predetermined angles. In this case, it is preferable that the reference angle is 45 ° which is the front surface among a plurality of predetermined angles (here, 15 °, 25 °, 45 °, 75 ° and 110 °). One evaluation target plot is obtained from one painted plate. In addition, the texture space graph may include a plurality of evaluation target plots based on the color measurement of a plurality of paint plates as shown in FIGS. 2 and 5. Only one evaluation target plot may be drawn. When a plurality of plots to be evaluated are plotted on the texture space graph, it becomes easy to compare the textures of the paint colors of the plurality of paint plates with one texture space graph.

  The position and distribution of the evaluation target plot in the texture space graph differ depending on the type of the glitter material included in the paint when the paint color is metallic or pearl. For this reason, the tendency of the texture of the paint color can be objectively grasped based on the position and distribution of the evaluation target plot in the texture space graph.

  In step ST108, the texture evaluation apparatus 20 determines whether or not to change the painted plate (display painted plate) selected in step ST104. When changing a display coating board (Yes), it progresses to step ST104 and the process after it is repeated. That is, another display paint board is selected in step S104, and a texture space graph for another display paint board is displayed in steps ST105 to ST107. If the display coating plate is not changed (No), the process proceeds to step ST109.

  In step ST109, the texture evaluation apparatus 20 determines whether or not to change the calculation result selected in step ST105. When changing a calculation result (Yes), it progresses to step ST105 and the process after it is repeated. In step ST106, another calculation result is selected, and in step ST106 and step ST107, a texture space graph for the other calculation result is displayed. When the calculation result is not changed (No), the process of displaying the texture space graph is terminated and the process of evaluating the texture is performed. That is, the texture evaluation process is a process for evaluating the texture of the paint color according to the tendency of the position where the evaluation target plot is arranged in the texture space graph.

  As described above, the texture of the paint color on the paint plate can be evaluated based on the position and distribution of the evaluation target plot drawn on the texture space graph. For this reason, the paint color can be specified between the paint manufacturer and the automobile manufacturer, or between the color designer of the automobile manufacturer and the person in charge of the factory line, and it is easy to develop and market the paint color of the color designer. At the same time, it becomes possible to create distribution maps with different texture sensations in different countries around the world, and to grasp the taste of textures that could not be expressed so far. In addition, it is possible to evaluate the difference in texture between multiple paint colors, and support the development of paint colors for marketing and color design.

  In the appearance color texture evaluation system 10 as described above, when the evaluation target plot drawn in the texture space graph is selected, as a specific example, the texture space graph and the evaluation target plot are displayed on the image display means of the texture evaluation device 20. In addition, when an evaluation target plot is selected with a mouse or the like, the colorimetric values corresponding to the selected evaluation target plot may be displayed on the image display means as a simulation image.

  Next, the flow of processing for creating a simulation image will be described. FIG. 6 is a flow for explaining the flow of processing for creating a simulation image. FIG. 7A is a diagram illustrating an example of a simulation image. FIG. 7B is a diagram illustrating an example of a data read image for generating a simulation image.

Here, the processing from step ST201 to step ST204, which will be described later, may be performed together with the processing from step ST101 to step ST107 for displaying the above-described texture space graph, or any step of displaying the texture space graph. The same processing as the processing may be shared.
In step ST201, the multi-angle colorimeter (not shown) corresponds to a plurality of predetermined angles (for example, 15 °, 25 °, 45 °, 90 °, and 110 °) and is a coating plate to be evaluated. Measure multiple color attributes. The attributes of the plurality of colors are, for example, lightness L *, chromaticity a *, and chromaticity b * in the L * a * b * color system.

  In step ST202, the texture evaluation apparatus 20 inputs a plurality of color attributes (colorimetric values) from the multi-angle colorimeter.

  In step ST203, the texture evaluation device 20 calculates an interpolation line (color solid colorimetric curve) for interpolating between the colorimetric values measured corresponding to a plurality of predetermined angles. Interpolation using the color solid colorimetric curve may be performed using an interpolation type spline curve, or may be performed using other interpolations such as a Beju curve. When the evaluation target plot drawn in the texture space graph and displayed on the image display means is selected (clicked) by the input / output means of the texture evaluation apparatus 20, the color solid colorimetric curve is displayed in the L * a * b * table. It may be drawn in the coordinate space of the color system and displayed on the image display means together with the coordinate space.

  In step ST204, the texture evaluation apparatus 20 creates a simulation image for indicating the colorimetric value input in step ST202, the saturation C * and the hue h obtained by the above equations 1 and 2, and the like. It is displayed on the image display means.

  As shown in FIG. 7A, the simulation image includes a colorimetric value display area 111, a color display area 110, and a color difference display area 112. The colorimetric value display area 111 has lightness L *, chromaticity a *, chromaticity b *, and saturation corresponding to a plurality of predetermined angles (here, 15 °, 25 °, 45 °, 75 °, and 110 °). C * and hue h are displayed. The color display area 110 continuously displays colors corresponding to a plurality of predetermined angles (colors on the color solid colorimetric curve) with respect to the angles. In the color difference display area 112, when two angles are designated, for example, as shown by reference numeral 113 in the lower part of FIG. 7B, when 15 ° of highlight and 45 ° of face are designated, brightness difference (ΔL *) Saturation difference (ΔC *) and hue difference (Δh) are displayed. In the case of maximum difference, the maximum brightness is selected from all the color values of 15 °, 25 ° 45 °, 75 ° and 110 °. And the difference between the minimum brightness (maximum brightness difference ΔL *), the difference between the maximum saturation and the minimum saturation (maximum saturation difference ΔC *), the difference between the maximum hue and the minimum hue (maximum hue difference Δh), etc. indicate.

  Here, the texture evaluation apparatus 20 described above, in step ST106, sets the colorimetric lightness difference, the colorimetric chroma difference, and the colorimetric hue difference in a coordinate space having the lightness difference ΔL *, the chroma difference ΔC *, and the hue difference Δh as coordinate axes. (One of the two-angle hue difference, the two-angle lightness difference and the two-angle saturation difference obtained in step ST102 and the maximum hue difference, the maximum brightness difference and the maximum saturation difference obtained in step ST103) is plotted. is doing. However, in order to make it easy to grasp the tendency of the texture of the paint color, the texture evaluation apparatus 20 determines the brightness difference ΔL *, the saturation difference ΔC *, and the hue difference from the colorimetric brightness difference, the colorimetric saturation difference, and the colorimetric hue difference. You may plot in the coordinate space which uses two of (DELTA) h as a coordinate axis. Next, the flow of processing when plotting the colorimetric brightness difference, the colorimetric chroma difference, and the colorimetric hue difference in a two-dimensional coordinate space will be described. FIG. 8 is a flow for explaining the flow of processing when creating a two-dimensional coordinate space.

  Since the processing from step ST301 to step ST306 is the same as the processing from step ST100 to step ST105, the description thereof is omitted.

  In step ST307, the texture evaluation apparatus 20 selects a display surface in order to plot the colorimetric hue difference, colorimetric brightness difference, and colorimetric saturation difference in a two-dimensional coordinate space (display surface). Here, the texture evaluation device 20 includes a ΔL * ΔC * plane having the brightness difference ΔL * and the saturation difference ΔC * as coordinate axes, and a ΔL * Δh plane having the brightness difference ΔL * and the hue difference Δh as coordinate axes. Of these, select which one to use as the display surface.

  In step ST308, the texture evaluation apparatus 20 selects one of the two-angle hue difference, the two-angle brightness difference, and the two-angle saturation difference, the maximum hue difference, the maximum brightness difference, and the maximum saturation difference selected in step ST303. Based on one, the plot position for drawing the evaluation target plot on the display surface is calculated. The display surface is generated by the texture evaluation device 20 before the process of step ST301 is performed.

  In step ST309, the texture evaluation apparatus 20 determines whether the display surface selected in step ST309 is the ΔL * ΔC * surface or the ΔL * Δh surface. If the selected display surface is the ΔL * ΔC * surface, the process proceeds to step ST310. When the selected display surface is the ΔL * Δh surface, the process proceeds to step ST311.

  In step ST310, the texture evaluation apparatus 20 draws the plot position (evaluation target plot) calculated in step ST308 on the ΔL * ΔC * plane (see FIG. 9). FIG. 9 shows a ΔL * ΔC * plane on which a plurality of evaluation target plots are plotted. In the ΔL * ΔC * plane, the vertical axis represents the lightness difference ΔL *, and the horizontal axis represents the saturation difference ΔC *. On the ΔL * ΔC * plane shown in FIG. 9, plots for evaluation of brightness difference and saturation difference are indicated by “black circles”. The evaluation target plot may be set to the color of the painted plate measured at a reference angle among a plurality of predetermined angles.

  In step ST311, the texture evaluation apparatus 20 displays the plot position calculated in step ST308 on the ΔL * Δh plane (see FIG. 10). FIG. 10 shows a ΔL * Δh plane on which a plurality of evaluation target plots are plotted. In the ΔL * Δh plane, the vertical axis represents the brightness difference ΔL *, and the horizontal axis represents the hue difference Δh. The evaluation target plot may be set to the color of the painted plate measured at a reference angle among a plurality of predetermined angles.

  Further, on the ΔL * ΔC * surface and ΔL * Δh surface, a plurality of evaluation target plots may be drawn based on the fact that a plurality of painted plates are color-measured as shown in FIGS. Only one evaluation target plot may be drawn based on the color measurement of two painted plates. When multiple evaluation target plots are plotted on the ΔL * ΔC * surface or ΔL * Δh surface, it is easy to compare the textures of the paint colors of multiple paint plates using the ΔL * ΔC * surface or ΔL * Δh surface become.

  In step ST312, the texture evaluation apparatus 20 determines whether or not to change the display surface selected in step ST307. If the display surface is to be changed (Yes), the process proceeds to step ST307. When the display surface is not changed (No), the process of drawing the colorimetric hue difference, the colorimetric brightness difference, and the colorimetric saturation difference in the two-dimensional coordinate space (display surface) is terminated.

  As described above, even when the evaluation target plot is drawn on the ΔL * ΔC * plane or the ΔL * Δh plane, similarly to the case where the evaluation target plot is drawn on the above-described texture space graph, it is based on the position and distribution of the evaluation target plot. Thus, the texture of the paint color on the paint plate can be evaluated.

  In addition, the appearance color texture evaluation system 10 sets an arbitrary area in the coordinate space (the texture space graph, the ΔL * ΔC * plane, and the ΔL * Δh plane), and associates the set area with the texture language representing the texture. Thereafter, when a texture language is selected, an area corresponding to the selected texture language can be displayed in the coordinate space in which the evaluation target plot is drawn. This will be described in detail below.

  The texture language includes a glittery feeling, a glittering feeling, a tecateka feeling, a smooth feeling, a particle feeling, and a missing feeling. If a texture language such as glitter or glitter is associated with an arbitrary area in the texture space graph, the distribution trend of the evaluation target plot drawn in the texture space graph using the texture language (paint color It is possible to easily determine the tendency of the texture).

  First, a process (language providing process) for associating a texture language with a set area (texture language area) in the texture space graph will be described. FIG. 11 is a flow for explaining language assignment processing. FIG. 12 is a diagram illustrating an example of a case where a texture language area in a texture space graph is associated with a texture language.

First, a texture language area is set.
In step ST401, the texture evaluation device 20 sets a range of brightness difference ΔL * for setting a texture language area.
In step ST402, the texture evaluation device 20 sets a range of the saturation difference ΔC * for setting the texture language area.
In step ST403, the texture evaluation apparatus 20 sets a range of the hue difference Δh for setting the texture language area.

  In step ST404, the texture evaluation device 20 assigns a texture language to the three-dimensional area (texture language area) surrounded by the brightness difference, saturation difference, and hue difference ranges set in steps ST401 to ST403. To do. As shown in an example in FIG. 12, there are a texture language such as a glittery feeling, a glittering feeling, a ticker feeling, and a smooth feeling, and each three-dimensional area (each texture language area: an area indicated by a broken line in FIG. 12) in the texture space graph. It is associated.

  In step ST405, the texture evaluation apparatus 20 determines whether or not to add a new texture language. That is, the texture evaluation device 20 determines whether or not a texture language and a texture language area are newly associated with each other. If a new texture language is to be assigned (Yes), the process proceeds to step ST401. When a new texture language is not assigned (No), the texture language area set by the texture language assignment process described above is stored in the texture language area DB 32, and the series of processes is terminated.

  Next, a process for displaying the texture language area set by the language providing process on the image display unit of the texture evaluation apparatus 20 will be described. FIG. 13 is a flowchart of processing for displaying a texture language area. In the following, an example in which a texture language area is displayed on the texture space graph will be described.

  In step ST501, the texture evaluation apparatus 20 selects the texture language set by the language providing process described above. As an example, the texture evaluation apparatus 20 selects a glitter feeling when a glitter feeling, a glitter feeling, a ticker feeling, and a smooth feeling are set as the texture language.

  In step ST502, the texture evaluation apparatus 20 (the color difference display calculation means constituting the texture evaluation apparatus 20) sets the texture language area corresponding to the texture language selected in step ST501 (for example, the above-described glitter feeling) to the texture language area DB 32. Are displayed on the texture space graph and the evaluation target plot plotted in the texture language area is displayed. Note that, when the texture language area is displayed on the texture space graph, the texture evaluation apparatus 20 can also display only the evaluation target plot inside the displayed texture language area.

  In step ST503, the texture evaluation apparatus 20 determines whether to select another texture language area in order to display other texture language areas other than the texture language area displayed in step ST502 on the image display means. . When another texture language area is selected (Yes), the process proceeds to step ST501. When another texture language area is not selected (No), the process of displaying the texture language area is ended.

  When a plurality of texture language areas are selected by the processing from step ST501 to step ST503, a plurality of texture language areas are displayed on the texture space graph as shown in FIG.

  As a result, by associating the texture language area in the texture space graph with the texture language that is a human sense, what is the brightness difference, saturation difference, and hue difference, a metallic feeling, a nuisance feeling, a glittering feeling, It can be visually confirmed whether or not individual textures such as glare, transparency, depth, clearness, color accumulation, and denseness are generated. In addition, the texture of the paint color can be objectively evaluated regardless of differences in the senses and language of each country and ethnic group. Further, by associating the texture language area with the texture language, it is possible to display the evaluation target plot plotted on the texture space graph for each texture language.

  FIG. 14 is a diagram illustrating a hardware configuration of the information processing apparatus 500 according to an embodiment of the present invention. An information processing apparatus 500 as an appearance color texture evaluation apparatus includes an input device 550 as an input / output unit (input unit), an image display unit 540 as a display unit, a CPU 510 as a processing unit (processing unit), and a main storage unit 520. Prepare. The input device 550 receives a colorimetric value obtained by measuring the color of the painted plate with a multi-angle colorimeter (not shown). The image display unit 540 displays an image. The CPU 510 causes the image display unit 540 to display a coordinate space having the brightness difference, the saturation difference, and the hue difference as coordinate axes, or a coordinate space having two of the brightness difference, the saturation difference, and the hue difference as coordinate axes.

  The information processing apparatus 500 includes control units such as an image display control unit 530, a colorimetric value input control unit 552, a texture language area input control unit 554, and a USB terminal control unit 570 including a USB terminal 572. In addition, a colorimetric value database unit 610 and a texture language region database unit 620 are connected to the information processing apparatus 500. The colorimetric value database unit 610 stores information on brightness difference, saturation difference, and hue difference obtained based on the colorimetric values. The texture language area database unit 620 stores information in which an arbitrary range set in each of the brightness difference, the saturation difference, and the hue difference is associated with a language representing the texture.

In addition, a color difference display calculation unit 580 is connected to the information processing apparatus 500. The color difference display calculation unit 580 stores the brightness difference, the saturation difference, and the hue difference based on the information on the brightness difference, the saturation difference, and the hue difference stored in the colorimetric value database unit 610, and the texture language region database unit 620. The area surrounded by the arbitrary range based on the information that associates the determined arbitrary range with the language expressing the texture is displayed in any coordinate space displayed on the image display unit 540 by the CPU 510.
The input device 550 includes a keyboard input control unit 556, a keyboard 558, an external input terminal input control unit 560, an external input terminal 562, and the like.

  Preferably, the information processing apparatus 500 has the function of the information processing apparatus of the appearance color texture evaluation system 10 according to the present invention. That is, the information processing apparatus 500 shown in FIG. 14 is used as the texture evaluation apparatus 20 shown in FIG. Alternatively, the input device 550 that is an input / output unit of the information processing device 500 may be included in the user terminal 60 illustrated in FIG. 1, and the image display unit 540 that is a display unit may be the electronic display device 65, and image processing may be performed. The CPU 510 and the main storage unit 520 that are means may be included in the texture evaluation device 20.

DESCRIPTION OF SYMBOLS 1 Appearance color texture evaluation system 20 Texture evaluation apparatus 31 Colorimetric value database 32 Texture language area database 500 Information processing apparatus

Claims (6)

A generation step for generating a coordinate space having at least two of brightness difference, saturation difference and hue difference as coordinate axes;
A colorimetric step for measuring a plurality of color attributes of the evaluation target painted plate to be evaluated in correspondence with a plurality of predetermined angles;
A calculation step of calculating a colorimetric brightness difference, a colorimetric saturation difference, and a colorimetric hue difference based on the attributes of each color measured corresponding to the plurality of predetermined angles;
A position determining step for determining a position of the evaluation target plot in the coordinate space based on the colorimetric brightness difference, the colorimetric saturation difference and the colorimetric hue difference calculated by the calculating step;
Drawing an evaluation target plot at a position in the coordinate space determined by the position determination step, and displaying a coordinate space in which the evaluation target plot is drawn; and
An external color texture evaluation method, comprising: an evaluation step of evaluating an external color texture of the evaluation target painted plate based on the position of the evaluation target plot in the coordinate space. The colorimetric lightness difference, colorimetric saturation difference and colorimetric hue difference calculated in the calculating step are:
Among a plurality of brightnesses, a plurality of saturations and a plurality of hues obtained based on a plurality of color attributes corresponding to the plurality of predetermined angles, a maximum brightness difference which is a difference between each maximum value and a minimum value, a maximum Saturation difference and maximum hue difference,
A first predetermined angle and a second predetermined angle are selected from the plurality of predetermined angles, and brightness, saturation, and hue obtained based on a plurality of color attributes corresponding to the first predetermined angle; A two-angle lightness difference, a two-angle saturation difference, and a two-angle hue difference that are differences between the brightness, saturation, and hue obtained based on a plurality of color attributes corresponding to two predetermined angles;
The appearance color texture evaluation method according to claim 1, wherein the appearance color texture evaluation method is one of the above.   The appearance color texture according to claim 1 or 2, wherein, in the display step, a color of the evaluation target plot is set to a color of the evaluation target painted plate measured at a reference angle among the plurality of predetermined angles. Evaluation methods. A setting step for setting an arbitrary area in the coordinate space;
An association step of associating the region set in the setting step with a texture language representing a texture;
2. The display step according to claim 1, wherein when the texture language is selected, an area corresponding to the selected texture language is displayed in the coordinate space in which the evaluation target plot is drawn. 4. The appearance color texture evaluation method according to any one of items 1 to 3. An image display unit for displaying an image;
In response to a plurality of predetermined angles, an input unit for inputting attributes of a plurality of colors obtained by measuring the color of an evaluation target paint plate to be evaluated;
A colorimetric value database unit for storing each information of colorimetric brightness difference, colorimetric chroma difference and colorimetric hue difference obtained based on the attributes of the plurality of colors;
A texture language region database unit for storing correspondence information in which a region set in a coordinate space having at least two of lightness difference, saturation difference, and hue difference as coordinate axes and a texture language representing a texture are associated with each other;
A processing unit for displaying the coordinate space on the image display unit;
In the coordinate space corresponding to each of the colorimetric lightness difference, the colorimetric chroma difference and the colorimetric hue difference based on each information of the colorimetric lightness difference, the colorimetric chroma difference and the colorimetric hue difference stored in the colorimetric value database unit A color difference display calculation unit that draws an evaluation target plot at a position and draws the region in the coordinate space based on the correspondence information stored in the texture language region database unit. Color texture evaluation device. Information on colorimetric brightness difference, colorimetric chroma difference, and colorimetric hue difference based on the attributes of multiple colors obtained by measuring the color of the evaluation target paint plate to be evaluated corresponding to multiple predetermined angles. A first database for storing
A second database that stores correspondence information in which a region set in a coordinate space having at least two of lightness difference, saturation difference, and hue difference as coordinate axes, and a texture language representing a texture, are associated;
An information processing apparatus for displaying the coordinate space;
Positions in the coordinate space corresponding to each of the colorimetric lightness difference, the colorimetric chroma difference and the colorimetric hue difference based on the information on the colorimetric lightness difference, colorimetric chroma difference and colorimetric hue difference stored in the first database. A color difference display calculation means for drawing an evaluation target plot in the coordinate space and drawing the area on the basis of the correspondence information stored in the second database. Evaluation system.

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