KR102249615B1 - Colorimetry device and method - Google Patents

Abstract

The colorimetric device according to the present invention comprises: a housing having an inner space; A plurality of colorimetric modules disposed on the inner surface of the housing, including an illumination unit for irradiating light to an object and a light receiving unit for detecting reflected light reflected from the object, and measuring colorimetric information from the detected reflected light; And a control unit that controls illumination and light reception of the colorimetric module, receives the colorimetric information measured by the colorimetric module, and calculates the color of the object, wherein the colorimetric module is disposed at a plurality of positions. Inside the housing, the object may be illuminated and received from various angles.

Description

Colorimetry device and method

The present invention relates to a colorimetric apparatus and a colorimetric method, and more specifically, to a colorimetric apparatus and a colorimetric method capable of colorimetry from multiple angles using a plurality of colorimetric modules capable of simultaneously lighting and receiving light.

The importance of color measurement and inspection management is increasing as the color quality is emphasized due to the recent product upgrade, and the issue of minimizing quality dispersion due to the generalization of mass production technology has emerged. Since the human color perception process follows antagonism in which the ambient signal decreases in a logarithmic function around the maximum signal intensity, the position of the maximum signal on the surface of the object depends on the fine shape of the object surface and the angle of the light source and the observer. Changes, and the perceived color changes accordingly. There have been a number of studies to reduce the deviation between perceived colors by reflecting these characteristics to a measuring instrument, but due to limited experimental conditions, it was not possible to sufficiently derive the relationship between various surface shapes and perceived colors. If the relationship of perceived color to various surface shapes can be identified, it is possible to measure more precisely than the existing color measurement, and by using it, the quality of products can be expected to improve in the overall industry that demands color.

The conventional colorimetric technique does not reflect the pattern characteristics of the object surface because it measures the average color of a very small area. In addition, since the object color is measured from a limited angle, if there is a color difference when viewed from a different angle, there is a problem that an error occurs when measuring the actual object color. To compensate for this, even if the object color is measured multiple times while changing the light-receiving angle or lighting, it takes time and cost to change the angle, and the characteristics of the object change over time or the surrounding environment changes over time. It is impossible to experiment with various angles under the same conditions.

Japanese Unexamined Patent Application Publication No. Hei 10-137194 (1998.05.26.)

The present invention has been conceived to solve the above problems, and an object of the present invention is to provide a colorimetric apparatus and a colorimetric method that performs colorimetry at various three-dimensional angles and calculates a color result close to the color perceived by an observer. .

In addition, an object of the present invention is to provide a colorimetric apparatus and a colorimetric method capable of measuring a color distribution by location of a fine shape rather than an average color of an object.

In addition, an object of the present invention is to provide a colorimetric apparatus and a colorimetric method using both direct sunlight and diffused light.

In addition, an object of the present invention is to provide a colorimetric apparatus and a colorimetric method capable of shortening the calculation time of a colorimetric result while enabling accurate and high-dimensional data acquisition compared to a conventional colorimetric method.

In order to achieve the above object, a colorimetric device according to an embodiment of the present invention includes: a housing having an inner space; A plurality of colorimetric modules disposed on the inner surface of the housing, including an illumination unit for irradiating light to an object and a light receiving unit for detecting reflected light reflected from the object, and measuring colorimetric information from the detected reflected light; And a control unit configured to control illumination and light reception of the colorimetric module, receive the colorimetric information measured by the colorimetric module, and calculate the color of the object; wherein the colorimetric module is disposed at a plurality of positions to calculate the color of the object. It is characterized in that the object is illuminated and received from various angles from the inside.

Here, the housing may have a hemispherical shape.

In addition, a frame further includes a frame disposed along an inner curved surface from an upper end to a lower end of the housing, and each of the colorimetric modules may be disposed to be spaced apart from each other at a predetermined angular interval on the frame.

In addition, the colorimetric device according to an embodiment of the present invention further includes a rotating means for rotating the frame, wherein the frame can be rotated along the inner surface of the housing by the rotating means.

In addition, the control unit may select at least one colorimetric module to perform illumination or light reception among the plurality of colorimetric modules.

In addition, the controller may receive the location information of the colorimetric module from each of the plurality of colorimetric modules, and calculate the color of the object using the location information and the colorimetric information.

A colorimetric method according to an embodiment of the present invention includes: a housing having an inner space; A plurality of colorimetric modules disposed on an inner surface of the housing and including an illumination unit for irradiating light to an object and a light receiving unit for detecting reflected light reflected from the object, and measuring colorimetric information from the detected reflected light; And a controller configured to calculate the color of the object by controlling illumination and light reception of the colorimetric module and receiving the colorimetric information measured by the colorimetric module. Irradiating light onto an object and detecting reflected light reflected from the object by the light receiving unit; Measuring, by the colorimetric module, the colorimetric information from the detected reflected light; And calculating, by the control unit, the colorimetric information measured by the colorimetric module and calculating the color of the object; wherein the colorimetric module is disposed at a plurality of positions to illuminate the object at multiple angles within the housing. And receiving light.

In the colorimetric method according to an embodiment of the present invention, the housing may have a hemispherical shape.

In addition, in the colorimetric method according to an embodiment of the present invention, prior to the step of irradiating light to the object by the illumination unit and detecting the reflected light reflected from the object by the light receiving unit, illumination or light receiving among the plurality of colorimetric modules It may further include a step of selecting at least one colorimetric module to perform the;

In addition, in the colorimetric method according to an embodiment of the present invention, each of the colorimetric modules is disposed to be spaced apart from each other at predetermined angular intervals on a frame disposed along an inner curved surface from an upper end to a lower end of the housing, and the frame Can be rotated along the inner surface of the housing.

In addition, in the colorimetric method according to an embodiment of the present invention, in the step of measuring colorimetric information from the detected reflected light and calculating the color of the object, position information of the colorimetric module is obtained from each of the plurality of colorimetric modules. It is transmitted, and the color of the object may be calculated using the location information and the colorimetric information.

According to the present invention, since a colorimetric module capable of performing illumination and light reception at the same time is provided to perform colorimetry at various three-dimensional angles, a color result close to the color perceived by the observer can be calculated.

In addition, according to the present invention, based on the location information of each colorimetric module, it is possible to measure a color distribution for each location of a fine shape rather than an average color of the colorimetric target object.

Further, according to the present invention, both direct sunlight and diffused light can be used in measuring the color of an object, so that the accuracy of the measurement can be improved.

In addition, according to the present invention, since each colorimetric module performs multi-angle colorimetry at the same time, it is possible to obtain accurate and high-dimensional data compared to a conventional colorimetric method and shorten the calculation time of the colorimetric result.

1A and 1B are diagrams showing a conventional colorimetric device.
2 is a schematic diagram of a colorimetric apparatus according to an embodiment of the present invention.
3 is a diagram illustrating an exemplary configuration of a colorimetric module in a colorimetric device according to an embodiment of the present invention.
4 is a flowchart of a colorimetric method according to an embodiment of the present invention.

Hereinafter, a colorimetric apparatus and a colorimetric method according to the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are provided by way of example only in order to sufficiently convey the technical idea of the present invention to those skilled in the art, and the present invention is not limited to the drawings presented below and may be embodied in any other form. have.

1A and 1B are diagrams showing a conventional colorimetric device.

Conventional colorimetric devices often have a relatively simple geometric structure. Referring to FIG. 1A, this is a method of measuring according to conditions by adjusting the angles of illumination and light reception. A device having such a structure performs colorimetry at a specified angle. In the case where the reflection characteristics are changed by surface conditions such as roughness of an object to be measured, it is difficult to reflect that the colorimetric information is changed as the angular condition of illumination or light reception is changed. Due to this, the difference between the perceived color and the measured color may become more severe.

1B is a method of measuring the color of an object through light reception at an arbitrary angle using diffuse lighting. As a device including an integrating sphere as a configuration, high-precision information can be provided. However, since diffused illumination is used, there is a limitation in that it is difficult to calculate colorimetric information under directional illumination conditions.

2 is a schematic diagram of a colorimetric apparatus according to an embodiment of the present invention.

A colorimetric device according to an embodiment of the present invention includes a housing 100, a colorimetric module 200, and a control unit 300.

The housing 100 may be formed in the shape of a hemisphere or a dome, and has an inner space. The lower surface of the housing 100 may have an open structure, and when measuring the color of the object, the object to be colorimetric is located at the center O of the lower surface opening.

The colorimetric module 200 may include both an illumination unit 210 that irradiates light to an object and a light receiving unit 220 that detects reflected light reflected from the object, and is provided in plural.

The lighting unit 210 may include a light source capable of irradiating light to a colorimetric target object. As the light source, a pulsed xenon light source or the like may be used.

The light-receiving unit 220 includes a light-receiving element capable of detecting reflected light reflected from the colorimetric target object, and may further include a color filter or a spectral sensor according to a colorimetric technique. As the light-receiving element, a light detection sensor such as a photodiode may be used.

As mentioned above, since the colorimetric module 200 includes both the lighting unit 210 and the light receiving unit 220 to constitute one module, the colorimetric module 200 is All of the light reception for detecting reflected light reflected from the target object can be performed. In addition, colorimetric information can be measured from the detected reflected light. In this case, the colorimetric information may be the tristimulus value (x, y, z value) or spectral reflectance of the reflected light according to the colorimetric technique, and the measurement of this colorimetric information is a direct reading method for measuring the tristimulus value and the spectral reflectance. Since it is possible by a conventional technique such as a spectrophotometric method to be measured, a detailed description thereof will be omitted.

Each colorimetric module 200 is disposed on the inner surface of the housing 100 at various angles in a plurality of positions on the inner surface of the housing 100 to illuminate the object to be measured from multiple angles, and the reflected light reflected from the object is received from multiple angles. can do.

Meanwhile, the colorimetric module 200 may be disposed on the inner surface of the housing 100 to be spaced apart at predetermined angular intervals.

For example, the colorimetric module 200 has the center (O) of the lower surface opening of the housing 100 as the center of the circle, and along the trajectory on the circumferences (110, 120, 130, 140) passing through the uppermost vertex (O') of the housing 100 It may be directly disposed on the inner surface of the housing 100 with a predetermined angular interval.

Or, for example, the colorimetric device according to the present invention may further include a frame disposed along an inner curved surface from an upper end to a lower end of the housing 100, and each of the colorimetric modules 200 is at a predetermined angular interval on the frame. And can be arranged to be spaced apart from each other in the vertical direction.

The predetermined angular interval may be a constant angular interval (e.g., 25° intervals), or a different angular interval between each colorimetric module 200 (e.g., the interval between the first colorimetric module and the second colorimetric module is 15°, The distance between the second colorimetric module and the third colorimetric module may be 25°). These angular intervals can be appropriately changed according to functional needs.

In this case, the frame may be provided in a single or plural number, and both ends of the frame in the longitudinal direction may be installed to be spaced apart a predetermined distance from the uppermost vertex (O') and the lowermost open surface of the housing.

In the colorimetric apparatus according to the present invention, the colorimetric module 200 may freely select and change its position in the x, y, and z directions.

For example, the device according to the present invention may further comprise a rotating means for rotating the frame, by means of which the frame can be rotated between 0° and 360° along the inner surface of the housing 100.

The frame can guide the position of the colorimetric module 200 by the rotational movement, so that the colorimetric module 200 may be moved to a predetermined position to perform illumination and light reception, and the colorimetric module 200 is placed at a predetermined time interval. It is also possible to perform illumination and light reception while rotating and moving.

Here, the rotating means may be a mechanical member for manual rotation or a motor for automatic rotation. When the motor is used as a rotating means, a connection member for transmitting rotational power from the motor to the frame and a power supply for supplying power may be further included between the frame and the motor.

In addition, the device according to the present invention can move each colorimetric module 200 itself on a frame. For example, each of the frame and the colorimetric module 200 is provided with means for enabling the detachment of the colorimetric module 200 to manually detach or detach the colorimetric module 200 according to the user's convenience, operation mode, or functional needs. It can be attached to move its position. Alternatively, the colorimetric module 200 may be automatically moved in the vertical direction along the frame using a moving means such as a motor. For this, the frame may adopt a rail structure.

As described above, by moving the frame in which the colorimetric module 200 is disposed or the colorimetric module 200 itself, it is possible to select and change the position of the colorimetric module 200 in the x, y, and z directions.

In the conventional colorimetric method, when the surface of the colorimetric object is rough, the lighting element and the light-receiving element of the colorimetric device are fixed and set, and different colorimetric information is measured even though the object is the same according to the set angle, resulting in the color of the object. This can be calculated differently, reducing the accuracy of the colorimetric result.

In addition, since the conventional colorimetric method is an average color measurement in one point or a local area, a difference between the colorimetric result and the perceived color result may occur in the case of an object having a large-area color distribution. That is, the large area conditions (shape, material, pattern, etc.) may not be considered. In addition, it is possible to measure several times at various angles for more accurate colorimetry, but in this case, the time consuming is increased. If an object to be colorimetrically changed over time, color information may be distorted and measured when colorimetric is performed multiple times as described above.

However, according to the colorimetric apparatus of the present invention, since the colorimetric module 200 capable of both illumination and light reception can be arranged at various angles in a three-dimensional image centering on an object, and the position of the three-dimensional image can be freely changed, the colorimetric target object Even when the surface of is rough, colorimetric information measured at various angles can be obtained, and a more precise colorimetric result can be calculated by synthesizing the information.

In addition, since the plurality of colorimetric modules 200 simultaneously illuminate and receive light from multiple angles, a precise colorimetric result can be obtained and a calculation time of the colorimetric result can be shortened.

In addition, when the illumination unit 210 of the colorimetric module 200 arranged at multiple angles simultaneously illuminates an object, not only direct sunlight is irradiated to the object, but also diffused light reflected and diffused from the inner surface of the housing 100 may be irradiated. More information can be obtained when calculating the colorimetric result.

The controller 300 controls illumination and light reception of the colorimetric module 200, receives colorimetric information measured by the colorimetric module 200, and calculates a color of an object.

In addition, the controller may receive the location information and the measured colorimetric information of each colorimetric module 200 from each of the plurality of colorimetric modules 200 and calculate the color of the object using the location information and the colorimetric information.

In this case, the location information may be location information determined on the x, y, and z axes.

In addition, the control unit 300 may acquire not only average information of a color of an object to be colorimetric but also distribution information of a color of a fine shape of the object through the location information of the colorimetric module 200. That is, according to the colorimetric apparatus of the present invention, it is possible to measure a two-dimensional color of a fine shape of an object.

The controller 300 may select at least one colorimetric module 200 to measure the color of an object by performing illumination or light reception among the plurality of colorimetric modules 200. Lighting and light reception are performed using only the colorimetric module 200 selected in this way, and the color of an object may be calculated using only colorimetric information measured by the selected colorimetric module 200.

In addition, the controller 300 may designate an operation mode to perform at least one of illumination and light reception for each of the plurality of colorimetric modules 200.

For example, the control unit 300 may designate a colorimetric module 200 to perform only illumination on an object by activating only the illumination unit 210 for each colorimetric module 200 (illumination mode), or the light receiving unit 220 By activating the bay, it can be designated to perform only the role of receiving light reflected from an object (light-receiving mode), or it can be designated to perform illumination and light-receiving simultaneously (simultaneous mode). Of course, since the colorimetric module 200 to measure the color of an object can be selected, the colorimetric module 200 that is not selected is in a state in which neither illumination nor light is received (inactive mode).

In this case, in selecting the colorimetric module 200 to perform illumination, it is of course possible to freely select the conditions of direct sunlight or diffused light.

That is, in other words, the colorimetric apparatus of the present invention can measure the color of an object using only the selected colorimetric module 200, and whether the role of each colorimetric module 200 is illumination or light reception, or simultaneous performance of illumination and light reception. You can also control it.

Accordingly, colorimetry can be performed by selecting an optimal operation mode according to functional conditions related to the size, shape, and surface roughness of an object, or economic conditions related to cost, time, and the like.

In addition, an operation mode may be previously stored in the control unit 300, and in this case, the user may select a previously stored operation mode in consideration of the complexity of the object shape, time required, and cost.

On the other hand, since the lighting unit 210 and the light receiving unit 220 in one colorimetric module 200 can perform both illumination and light reception at the same time, the light source of the illumination unit 210 and the light receiving element of the light receiving unit 220 are appropriately arranged to prevent lighting and light reception. Make sure there is no interference. For example, as shown in FIG. 3, a light-receiving element is placed in the center of the colorimetric module 200, and a plurality of light sources surround the light-receiving element in a circular shape. Even if light is irradiated from a given light source, interference may not occur in the light receiving element in the same colorimetric module 200.

4 is a flowchart of a colorimetric method according to an embodiment of the present invention.

Here, each step of the colorimetric method according to an embodiment of the present invention includes a colorimetric device according to an embodiment of the present invention, that is, a housing having an inner space; A plurality of colorimetric modules disposed on the inner surface of the housing and including both an illumination unit for irradiating light to an object and a light receiving unit for detecting reflected light reflected from the object, and measuring colorimetric information from the detected reflected light; And a control unit configured to control illumination and light reception of the colorimetric module, and calculate the color of the object by receiving the colorimetric information measured by the colorimetric module.

The colorimetric method according to an embodiment of the present invention includes the following process.

First, the lighting unit 210 irradiates light onto an object, and the light receiving unit 220 detects reflected light reflected from the object (S200). Thereafter, the colorimetric module 200 measures colorimetric information from the detected reflected light (S300), and the controller 300 receives the measured colorimetric information and calculates the color of the object (S400). In this case, the colorimetric module 200 may be disposed at a plurality of positions to perform illumination and light reception on the object from inside the housing 100 from multiple angles.

Here, the housing 100 may have a hemispherical shape.

In addition, each of the colorimetric modules 100 may be disposed to be spaced apart from each other at predetermined angular intervals on a frame disposed along an inner curved surface from an upper end to a lower end of the housing 100, and the frame You can move along the rotation.

In the colorimetric method according to an embodiment of the present invention, before the step (S200) of irradiating light to an object by the lighting unit 210 and detecting the reflected light reflected from the object by the light receiving unit 220 (S200), the control unit 300 The step (S100) of selecting at least one colorimetric module 200 to perform illumination or light reception among the three colorimetric modules 200 may be further included.

In addition, in the step of selecting the colorimetric module 200 (S100), the control unit 300 may designate an operation mode to perform at least one of illumination and light reception for each of the plurality of colorimetric modules 200. That is, for each colorimetric module 200, which colorimetric module 200 activates only the illumination unit 210 and designates it to perform only illumination on the object (illumination mode), or activates only the light receiving unit 220 to reflect from the object. It may be designated to perform only the role of receiving the received light (light-receiving mode), or it may be designated to perform illumination and light-receiving at the same time (simultaneous mode). Of course, since the colorimetric module 200 to measure the color of an object can be selected, the colorimetric module 200 that is not selected is in a state in which neither illumination nor light is received (inactive mode).

In the colorimetric method according to an embodiment of the present invention, when the step of selecting the colorimetric module 200 (S100) is further included, the illumination unit 210 irradiates light to the object and the light receiving unit 220 is reflected from the object. In the step of detecting the reflected light (S200), the light is irradiated from the illumination unit of the colorimetric module designated as the illumination mode or the simultaneous mode among the selected colorimetric modules, and the reflected light is detected from the light receiving unit of the colorimetric module designated as the light-receiving mode or the simultaneous mode among the selected colorimetric modules. .

Meanwhile, in the step of calculating the color of an object (S400), the location information of the colorimetric module 200 is received from each of the plurality of colorimetric modules 200, and the color of the object is calculated using the location information and the colorimetric information. can do.

In addition, when the colorimetric method according to an embodiment of the present invention further includes the step of selecting the colorimetric module 200 (S100), in the step of calculating the color of the object (S400), the selected colorimetric module 200 Illumination and light reception are performed using only, and the color of the object may be calculated using only the colorimetric information measured by the selected colorimetric module 200.

As described above, since each step of the colorimetric method according to an embodiment of the present invention can be performed by the colorimetric apparatus according to an embodiment of the present invention, a more detailed description and effects not mentioned for each step are described herein. It can be replaced with a description of the colorimetric device according to the embodiment of FIG. 2 of the invention.

As described above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited to the above-described embodiments, and various modifications and variations are made from these descriptions to those of ordinary skill in the field to which the present invention pertains. It is possible. Therefore, the technical idea of the present invention should be grasped only by the claims, and all equivalent or equivalent modifications thereof will be said to belong to the scope of the technical idea of the present invention.

100: housing
200: colorimetric module
210: lighting unit
220: light receiving unit
300: control unit

Claims (11)

A housing having an inner space;
A plurality of colorimetric modules disposed on the inner surface of the housing, including an illumination unit for irradiating light to an object and a light receiving unit for detecting reflected light reflected from the object, and measuring colorimetric information from the detected reflected light, wherein a plurality of positions A colorimeter module disposed in the housing to illuminate and receive light from multiple angles on the object; And
Includes; a control unit that controls the illumination and light reception of the colorimetric module, receives the colorimetric information measured by the colorimetric module and calculates the color of the object,
The control unit,
A colorimetric apparatus, characterized in that, among the plurality of colorimetric modules, one or more colorimetric modules to be used for color measurement of the object are selected, and control to perform at least one operation of illumination and light reception for each of the selected one or more colorimetric modules.
The method of claim 1,
The colorimeter device, characterized in that the housing has a hemispherical shape.
The method of claim 2,
Further comprising a frame disposed along the inner curved surface from the upper end to the lower end of the housing,
Each of the colorimetric modules is arranged to be spaced apart from each other at predetermined angular intervals on the frame.
The method of claim 3,
Further comprising a rotating means for rotating the frame,
Here, the frame is a colorimetric device, characterized in that the rotational movement along the inner surface of the housing by the rotation means.
delete The method of claim 1,
The control unit,
Receiving the location information of the colorimetric module from each of the plurality of colorimetric modules,
The colorimetric device, characterized in that calculating the color of the object by using the location information and the colorimetric information.
A housing having an inner space;
A plurality of colorimetric modules that are disposed on the inner surface of the housing and include an illumination unit that irradiates light to an object and a light receiving unit that detects reflected light reflected from the object, and measures colorimetric information from the detected reflected light, at a plurality of positions A colorimeter module disposed inside the housing to illuminate and receive light from multiple angles on the object; And
As a method of colorimetry using a colorimetric device comprising; a control unit for controlling the illumination and light reception of the colorimetric module and receiving the colorimetric information measured by the colorimetric module to calculate the color of the object,
Irradiating light to the object by the lighting unit and detecting reflected light reflected from the object by the light receiving unit;
Measuring, by the colorimetric module, the colorimetric information from the detected reflected light; And
Comprising, by the control unit, receiving the colorimetric information measured by the colorimetric module and calculating the color of the object; and
Before the step of irradiating light to the object by the lighting unit and detecting the reflected light reflected from the object by the light receiving unit, one or more colorimetric modules to be used for color measurement of the object are selected from among the plurality of colorimetric modules, and the selected one A colorimetric method, characterized in that one or more operations of illumination and light reception are performed for each of the colorimetric modules.
The method of claim 7,
The colorimetric method, characterized in that the housing has a hemispherical shape.
delete The method of claim 7,
Each of the colorimetric modules is disposed to be spaced apart from each other at predetermined angular intervals on a frame disposed along an inner curved surface from an upper end to a lower end of the housing,
The colorimetric method, characterized in that the frame rotates along the inner surface of the housing.
The method of claim 7,
In the step of measuring colorimetric information from the detected reflected light and calculating the color of the object,
Receiving the location information of the colorimetric module from each of the plurality of colorimetric modules,
And calculating the color of the object by using the location information and the colorimetric information.

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