KR101570616B1 - Colorimetry method using mobile app - Google Patents

Abstract

The present invention relates to a colorimetry method using a mobile app which enables a user to use a mobile device as a colorimeter by installing a colorimetriy application in the mobile device of ordinary users without using an expensive colorimeter equipment. The colorimetry method of the present invention includes: a first process of driving the colorimetry application installed in the mobile device; a second process of calling a photograph including an area for colorimetry, after the first process is done; a third process of obtaining a color measurement value by extracting a color as to a corresponding point as the user designates the point on the photograph called in the second process; and a fourth process of obtaining an international color standard coordinate as to the color measurement value of the third process, and displaying the result thereof in a colorimeter desired by the user.

Description

COLORIMETRY METHOD USING MOBILE APP}

The present invention relates to a colorimetric method using a mobile application, and more particularly, to a colorimetric method using a mobile app which enables a colorimetric application to be installed in a mobile device carried by ordinary users without using an expensive colorimetric device, ≪ / RTI >

The technical idea of the present invention is most preferably applied by installing a colorimetric application on a smart phone but is not necessarily limited to a mobile communication terminal, a portable multimedia player (PMP), a personal digital assistant Assistant, a digital camera, and the like.

In general, the measurement of color is referred to as colorimetry. In more detail, a Munsell colorimetric system, which is represented by a numerical value by physically measuring color, includes a color system corresponding to the three primary colors X, Y, An XYZ color system represented by Z, and the like.

The purpose of colorimetry is to measure color, accurately grasp, communicate, and reproduce color. In other words, it recognizes the color accurately, interprets it as a certain color system, transmits it, and connects the process of producing the color accurately.

The colorimetry of these colors plays an important role in the designation of objective color values and the management of colors. In order to make an objective measurement of color, international measurement standard and color display standard are provided, and scientific progress has been made so that the same colorimetry can be performed anywhere in the world.

Recently, its importance has become increasingly important not only in electronic products such as monitors, televisions, printers, but also in a wide variety of fields such as cloth fabrics, interior decoration, lighting, painting, rubber, dyeing, food, fermented foods, agriculture, , And the importance of metering and colorimetry equipment is increasing to realize higher quality of products.

In order to perform colorimetry, initially, a method of measuring color by the naked eye was used. However, in that case, the color difference may appear different depending on the characteristics and purpose of the observer, and since the color is discriminated by a very subjective criterion, And there was an issue that became unclear.

For example, when a red color is produced only by a human sensation, there may be a problem that the red color is changed every time the red color is changed due to the lightness of the maker and the subjective judgment of the maker.

Ultimately, a colorimeter was developed for accurate measurement, reducing the variability that can occur as a result of visual coloring.

A colorimeter for colorimetry is a filter type colorimeter for measuring three values of three sensor values, X, Y, and Z, which have three spectral sensitivities corresponding to the human eye and the same sensitivity, The spectral reflectance of the object is measured by measuring the reflectance, and the spectroscopic colorimetric system is used to calculate the tristimulus value or the chromaticity coordinate using a CIE standard light source and a standard observer.

About 10 companies worldwide, including the US, Japan, and Germany, are producing and supplying colorimetric colorimeters. They can be used as monitor light sources, spectrophotometers, colorimeters, portable spectrophotometers, luminance meters, spectrophotometers, Color difference system.

The CRT color analyzer is used for measuring the luminance and chromaticity of the CRT and PDP production lines, and is a meter for measuring and managing the color of the monitor by RGB.

The spectroradiometer is used for measuring luminance, chromaticity, correlated color temperature, non-contact object color, and luminance chromaticity of various light sources in the field of CRT and LCD display, and is a non-contact distance measurement type spectrometer.

The chroma meter is used for color adjustment of an illumination light source, a projector, a CRT and other display devices, a color adjustment of a light box or a light booth, and the development and production of various lights such as an LED. , And the chromaticity is measured.

The portable spectrophotometer is used for the measurement of all object colors except for rubber, painting, automotive interior and exterior materials, dyeing, fiber, painting, food, fluorescent products and transparent materials. to be.

The luminance colorimeter is used for luminance measurement, road illumination measurement, railway measurement, airport and outdoor sign measurement of CRT, LCD, EL, and the like, and accurate light is measured for each point as the camera is focused.

The spectrophotometer is used for transmission color measurement and fluorescence color measurement, and is a computer-controlled high-precision measuring device capable of measuring transparent color.

The colorimeter is applied to the fields of painting, rubber, printing, textile, dyeing, food, agriculture, and fisheries, and is used after measuring the tristimulus values using xenon (xenon) light.

However, such a colorimeter is formed at a very high price for a sensitive and sophisticated reason, which hinders enlargement of the use of the colorimeter.

In addition, since a customized white tile is provided for each colorimeter to increase the accuracy, there is a problem that a large maintenance cost is required due to regular calibration and repair.

In addition, there is a problem that there exists a colorimetric apparatus in which a colorimetric object is brought into close contact with or adhered to a colorimetric apparatus, or there is a colorimetric apparatus having a limitation on a place.

In addition, there is a problem in that colorimetric data are not compatible with each other when a colorimeter used at a factory differs from a colorimeter used by a buyer even when an expensive colorimeter is purchased and used.

Korean Patent Publication No. 10-2008-0009536 (published on 2008, 01, 29) Korean Registered Patent No. 10-1071541 (registered on 2011, 10, 04)

It is an object of the present invention to provide a colorimetric application for a mobile device (smart phone) carried by a user without using an expensive colorimeter, And to provide a method of colorimetry using a mobile app.

It is another object of the present invention to provide a color image processing method and a color image processing method in which a color of a desired portion is extracted from a photograph taken through a camera of a mobile device or a photograph stored in a mobile device to allow the user to colorize the image regardless of time or place And to provide a method of colorimetry using a mobile app.

It is another object of the present invention to provide a method of colorimetry using a mobile app that can calibrate an application so that an optimal color of a current state can be extracted through a calibration of an application before a photograph for a colorimetry is called.

It is another object of the present invention to provide a colorimetric method using a mobile application capable of calculating and providing a chrominance difference in color extraction for two or more points in a photograph.

However, the object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention for achieving the above object,

A first process of driving a colorimetric application installed in a mobile device;

A second step of, after the first step, calling a photograph including a region to be colorimetric;

A third step of extracting a color with respect to the point as a user designates a point on a photograph called in the second step and obtaining a color measurement value; And

And a fourth step of obtaining an international color standard coordinate for the color measurement value of the third process and displaying the result of the international color standard coordinate using the colorimetric desired by the user.

According to an additional feature of the present invention, in the first step, the step of preparing the camera so that the photograph including the colorimetry object can be extracted by the calibration at the time of photographing using a mobile device so as to extract an optimal color .

According to another additional feature of the present invention, a method for calling a photograph including an area to be color-checked in the second process includes shooting, loading, and history; The photographing includes a step of activating a camera function of the mobile device to display a photograph immediately taken, the importing displaying a list of photo files stored in a memory of the mobile device, and displaying the photographs according to a user's selection And the history includes a result list in which the coloring has been performed by the user and displaying the corresponding photograph.

L * a * b, L * C * h, L * u * v * for each point designated by the user on the called photograph in the third process, , a step of obtaining a color measurement value with a color gamut of sRGB,

In the fourth step, a photograph and a selected color are separated and displayed on the display unit of the mobile device, and the user selects a desired color among XYZ, Yxy, L * a * b, L * C * h, L * And displaying an international color standard coordinate for the colorimetric value of the system with an overlap of the selected color.

According to still another additional feature of the present invention, in the fourth step, when two colors are simultaneously selected, two selected colors are separated and displayed at the same time, and the international color standard coordinates for the color measurement values are overlapped with the selected color respectively, and displaying the color difference using? E * ab and? E * 00.

By applying the above-described coloring method using the mobile app of the present invention, it is not necessary to purchase an expensive colorimeter.

In addition, since a colorimetric application is installed on a mobile device (smart phone) carried by a user, the colorimetry can be easily performed by anyone simply by using it as a colorimeter, and the user can colorimetry regardless of time or place There is an effect that the problem of compatibility and correction of the colorimetric data can be solved.

In addition, when two or more points in a photograph are extracted, the color difference is calculated by using ΔE * ab and ΔE * 00 to provide the color difference error range. If the color error range is exceeded, Thereby enabling colorimetry.

Further, when the user executes the colorimetry application, there is an effect that more clear and accurate pictures (images) can be obtained through preparatory operation for obtaining the parameter value of the internal factors of the camera through the calibration.

Further, there is an effect that the color selected when the user is selecting a colorimetric object from the displayed photograph is enlarged and intuitively confirmed.

In addition, since the international color standard coordinates of the selected color are provided, an accurate color measurement value can be confirmed.

In addition, since the color list including the reference color is provided at the time of color selection, the position of the selected color on the chromaticity coordinates can be roughly known.

In addition, since the colorimetry object selected by the user is photographed and the colorimetry is performed using the displayed photographs, the colorimetric values of plants, foods, fruits, and organisms that have not been colorimetrically measured by a general colorimeter can be obtained.

Further, since coloring is performed using a photograph including the object to be colorimated after photographing the object to be colorimetric by the camera, remote colorimetry is possible and the object to be colorimetric is broadened.

1 is a flowchart schematically illustrating a process of colorimetry using a mobile application according to a preferred embodiment of the present invention.
2 is an exemplary view showing an application execution screen in the process of colorimetry according to a preferred embodiment of the present invention.
Fig. 3 is a view for explaining a colorimetric system for displaying a colorimetric result. Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims.

Also, terms used herein are for the purpose of illustrating embodiments and are not intended to limit the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising "used in the specification do not exclude the presence or addition of components other than the components mentioned. Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs.

First, a mobile device and an APP will be described in order to understand the present invention.

In general, mobile is interpreted in the dictionary meaning to be movable, mobile, mobile, and accurate. In other words, devices that are mobile and capable of wireless communication are called mobile devices, but most of the time, most of them talk about mobile phones, smart phones, and tablet PCs.

Recently, the number of cellular phones in Korea has been surveyed to more than 50 million, and it has become a necessary necessity. Among them, Korea's smartphone penetration rate is the highest in the world, with more than 40 million people using smartphones. A normal smartphone is easy to operate and easy to use, and it is a time when various communities and contents are being developed.

Currently, iOS and Android are widely used, and users can download various apps (APP) through mobile store and use various contents.

One of the fundamental differences between mobile phones and smartphones is that they can be installed and used depending on the application. It is the same concept as various programs used in computer. For example, computer applications such as MS Word, Hangul, Explorer, Firefox, video playback programs, and various online games are common computer applications.

In addition, even if the smartphone operating system or the mobile service provider is different, the same service can be used if the same app can be installed.

In addition, the smartphone can provide various functions such as internet banking, bus and subway route, navigation, movie, music appreciation simply by installing the corresponding application.

In addition, the cameras installed in smartphones have been developed rapidly. In modern times, the camera installed on the smartphone has a performance that is not inferior to that of a general camera such as an optical 10x zoom lens and a 20.7 million pixel camera.

As such, the development of smart phones and the improvement of the camera performance make the use of smartphone cameras more often than the use of general digital cameras.

The camera on the smartphone has various editing functions such as shooting function, enlargement, reduction and cropping.

In the present invention, a colorimetric application is installed in the smart phone, and a desired color can be measured in a photographed photograph.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flowchart schematically illustrating a process of colorimetry using a mobile application according to a preferred embodiment of the present invention. FIG. 2 is a flowchart illustrating a process of colorimetry according to a preferred embodiment of the present invention. Fig.

Referring to FIGS. 1 and 2, a coloring application installed in a mobile device is driven (refer to step S10). This operation is performed by touching a corresponding icon among a plurality of APP icons installed on a smart phone, ) Is executed.

At this time, calibration is performed to prepare a camera of a mobile device that obtains a parameter value of a camera internal factor, so that a clearer and more accurate picture (image) can be obtained (step S20)

After the above process is completed, a method of calling a picture is selected (refer to step S30)

The method of calling a photograph including the area to be colorimetated includes photographing, retrieval, and history, and is displayed as an icon as shown in FIG.

At this time, if the icon for photographing is touched, the camera function of the mobile device is activated to display a screen to be photographed on the screen of the mobile device (refer to step S41), and touches the setting icon to display automatic, bright, blur, landscape, (Refer to step S42). When the photographing icon is touched, the photographing is performed (refer to step S43), and the photographed photograph is displayed on the screen of the mobile device (refer to step S44)

On the other hand, when the retrieve icon is touched, a list of photo files stored in the memory of the mobile device is displayed (refer to step S51), and the photo is displayed on the screen of the mobile device according to the user's selection (refer to step S52). (Refer to step S53). At this time, the list of the stored photo files is displayed as a preview photo so that the user can confirm the photo in advance.

On the other hand, if the history icon is touched, a result list in which the user has previously performed coloring has been displayed and corresponding pictures are displayed (refer to step S61). In accordance with the user's selection (refer to step S62) (Refer to step S63)

When a photograph is called and displayed by the above process, if a user designates a point of a color to be extracted from a photograph, the color of the point is accumulated at the bottom, and color extraction is performed up to a maximum of six colors (S70 At this time, the photograph and the selected color are separated and displayed on the screen of the mobile device, and when a specific selected color is touched, the entire screen is enlarged and displayed.

Then, the international color standard coordinates of the extracted color measurement values are calculated (refer to step S80). At this time, color extraction is performed for each point designated by the user, and XYZ, Yxy, L * a * b , L * C * h, L * u * v *, and sRGB colorimetric system.

In the above process, a photograph and a selected color are separated and displayed on a screen of a mobile device, and a colorimetric system such as XYZ, Yxy, L * a * b, L * C * h, L * u * Value is overlapped with the selected color to display the international color standard coordinate (refer to step S85)

In this case, if two colors are simultaneously selected (refer to step S90), the two selected colors are separated and displayed at the same time, and the international color standard coordinates of the color measurement values are overlapped with the selected color, respectively , And the color difference is displayed using? E * ab and? E * 00 (refer to step S95)

Thereafter, the photographs, color coordinates, color difference, date, and time used in the colorimetry are stored and managed.

On the other hand, the color system represented on the colorimeter is KS (Korean Industry Standard), ISO (International Standard), ASTM (American Standard), JIS (Japanese Industrial Standard), DIN Standard), there are chromatic systems of XYZ, Yxy, L * a * b, L * C * h, L * u * v * and sRGB as shown in FIG.

XYZ - XYZ The concept of trinity is based on the three primary color theory of color vision. There are three types of color matching functions, x (λ), y (λ), and z (λ), which have high sensitivity to red, green, and blue light, respectively.

Yxy - Y is the brightness (corresponding to the triplet Y), and x and y are the coordinates representing the chromaticity calculated at the tristimulus value XYZ. The color system becomes achromatic as it goes to the center, and becomes higher as it goes to the periphery.

L * a * b * - L * a * b * In the color space, L * represents brightness, and a * and b * represent chromaticity coordinates. In this diagram, a * and b * indicate the color direction. That is, + a * indicates red, -a * indicates green, + b * indicates yellow, and -b * indicates blue. The center is achromatic. As the a * and b * values increase, the saturation increases as the point moves from the center to the outside.

L * c * h - L * C * h The color space uses the same diagram as L * a * b *. However, instead of using square coordinates, use cylindrical coordinates. In this color space, L * represents brightness as L * in L * a * b *. C * is chroma (saturation) and h is hue angle. The C * value for chroma is 0. at the center and increases as the distance from the center increases. The color imprint h is defined as starting from the + a * axis and is set to 0. Here, So 0. is + a * (red), 90. is + b * (yellow), 180. is -a * (green), and 270. is -b * (blue).

L * u * v * - In many practical applications, color stimuli with matching lines in an additive mixture of color stimuli in the same line are used to characterize color and chroma in color television and color photographs. L * represents the dimension of brightness, u * and v * represent the two saturation axes. U * roughly represents the yellow to blue axis, and v * represents the red to green axis, although the endpoints of the axes do not represent opposite or unique colors. The formula for obtaining the L * u * v * coordinates is obtained through the uv and u'v 'values.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be appreciated that one embodiment is possible. Accordingly, the true scope of the present invention should be determined by the technical idea of the claims.

Claims (5)

A first process of driving a colorimetric application installed in a mobile device;
A second step of, after the first step, calling a photograph including a region to be colorimetric;
A third step of extracting a color with respect to the point as a user designates a point on a photograph called in the second step and obtaining a color measurement value; And
A fourth step of obtaining an international color standard coordinate for the color measurement value of the third process and displaying the result of the international color standard coordinate by a colorimetric desired by the user;
In the fourth step, when two colors are selected at the same time, two selected colors are separated and displayed at the same time, and international color standard coordinates for the color measurement values are overlapped with the selected color to display ΔE * ab And displaying a color difference using? E * 00.
The method according to claim 1,
Wherein the first step includes a step of preparing a camera by obtaining a parameter value of a camera internal factor through a calibration when photographing a photograph including a colorimetric object using a mobile device, Colorimetric method.
The method according to claim 1,
The method for calling a photograph including an area to be color-checked in the second process includes shooting, loading, and history;
Wherein photographing comprises activating a camera function of the mobile device to display a photograph immediately taken,
The loading includes displaying a list of photo files stored in the memory of the mobile device and displaying the photo according to a user's selection,
Wherein the history includes a result list in which the user has previously been colorimetrically analyzed and a corresponding photo displayed.
The method according to claim 1,
In the third step, a color measurement value is obtained by a color system of XYZ, Yxy, L * a * b, L * C * h, L * u * v *, and sRGB for each point designated by the user on the called photograph / RTI >
In the fourth step, a photograph and a selected color are separated and displayed on the display unit of the mobile device, and the user selects a desired color among XYZ, Yxy, L * a * b, L * C * h, L * And displaying the international color standard coordinates of the color measurement value in the overlapping manner with the selected color.
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