KR101499004B1 - Method and apparatus for searching test target in photo image by using color light - Google Patents

Abstract

Provided by the present invention is a method to search a test target on a photographed object using color light. The search method includes the following steps of: preparing a test target; illuminating white light to the test target; photographing the test target and outputting the photographed object; setting a test area on the photographed object; extracting a color of the test area and the representative value of the color; controlling the brightness of the illumination in response to the extracted representative value; and performing the output of the photographed object, the extraction of the color, and the brightness control of the illumination again. The present invention is able to easily distinguish a test target by: radiating light of a color corresponding to the color of the test target to the test target in a photographed object after photographing the test target; emphasizing the color of the test target by radiating light of a color corresponding to the complementary color of the color of the test target; or emphasizing colors of objects besides the test target.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for searching an object to be inspected on a photograph using a color illumination,

More particularly, the present invention relates to an illuminating device and method, and more particularly, to an illuminating device and a method for illuminating an illuminant corresponding to a color of an object to be inspected, The present invention relates to a method and an apparatus for searching an object to be inspected on a photographed object by using a color light to illuminate the object.

Various methods have been used for the inspection of products manufactured in food manufacturing and other manufacturing industries. A method of inspecting a manufactured product using a camera and then inspecting and inspecting the product using the captured product is disclosed.

In order to perform such inspection, it is necessary to search only a specific inspection object on a photographing object of the inspection object. For this purpose, light of appropriate brightness and color needs to be irradiated to the object to be inspected.

However, most of the illumination used in the conventional inspection apparatuses is a single color such as white, red, orange, yellow, green, and blue.

In the case where the illumination is monochromatic, if the object to be inspected does not correspond to the color of the illumination, or if it has various colors, there is a problem that the precision of the inspection is deteriorated.

Korean Patent Publication No. 2006-0057940 discloses a solution to the above problem.

The prior art described above allows color information to be reproduced using a complementary color signal of a color signal of an object in an image of an object taken through a predetermined color filter, so that an object to be inspected can be searched through color information.

In the prior art described above, since the image is photographed through the color filter, the color information of the photographed object can be limited according to the color of the color filter itself, and various color filters are required to overcome the color information. .

To prevent this, an inspection apparatus capable of combining a plurality of lights corresponding to the three primary colors of light and illuminating them in a predetermined color has been disclosed.

Although the above-described inspection apparatus can output various colors, the process of combining a plurality of lights is performed manually by a worker, which results in a problem that precision of inspection is lowered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a color image forming apparatus, a color image forming apparatus, A method and an apparatus for searching an object to be inspected on a photographed object by using light of a color corresponding to the complementary color of the object to be inspected and the color of the inspection object is weakened and the color of the object other than the inspection object is highlighted do.

According to a first aspect of the present invention for achieving the above object, Illuminating the inspection object with white light; A step of photographing the object to be inspected and outputting a photographing object; Setting an inspection area on the photographing object; Extracting representative values of color and hue of the inspection region; Controlling brightness of the illumination corresponding to the extracted representative value; And a step of re-executing the image output, color extraction, and illumination brightness control.

According to a second aspect of the present invention for accomplishing the above object, Illuminating the inspection object with white light; A step of photographing the object to be inspected and outputting a photographing object; Setting an inspection area on the photographing object; Extracting a color and a representative value of the inspection area; Detecting a complementary color of the extracted color and a representative value of the complementary color; Controlling brightness of the illumination corresponding to the detected complementary color; And outputting the captured image again, and extracting the color and the color value again.

The white light can be emitted by a combination of R, G, and B illumination units whose brightness is controlled by current control.

The brightness control of the illumination may be performed by current control.

The step of extracting the color and the representative value of the inspection region includes the steps of obtaining R, G, and B values of the pixels included in the inspection region, obtaining an average of the R, G, and B values, , G, and B values, which are overlapping values.

The step of detecting the complementary colors may perform the following Equations 1 to 4 sequentially.

[Equation 1]

여기서, W는 무채색인 백색의 값

Here, W represents a value of white which is an achromatic color

&Quot; (2) "

&Quot; (3) "

&Quot; (4) "

The control of the light source according to the complementary color can be performed by the following equations (8) to (10).

&Quot; (8) "

&Quot; (9) "

&Quot; (10) "

(Where r, g, and b are the brightness of the complementary color light source)

According to an aspect of the present invention, there is provided an illumination device for detecting color in a photographed object photographed by an inspection object and for searching the inspection object for illuminating illumination corresponding to the sensed color, An illuminator for illuminating light with respect to an object to be inspected; A power supply unit for supplying power to the illumination unit; A photographing unit photographing the object to be inspected and outputting a photographing object; A control unit for setting an inspection area on the photographing object, detecting a color and a color representative value of the set inspection area, and outputting the corresponding power supply unit control signal; And a display unit for displaying an operation state of the control unit and the illumination unit.

The illumination unit may include at least one of R, G, B, and W LEDs.

The illumination unit may include at least one of R, G, B, and W integrated LEDs.

The illumination unit may include at least one of R, G, and B LEDs.

The illumination unit may include at least one of R, G, and B integrated LEDs.

The present invention as described above is characterized by irradiating a light of a color corresponding to a color of an object to be inspected to an object to be inspected on a photographed object after photographing the object to be inspected or irradiating light of a color corresponding to a complementary color of the object to be inspected, Or an object other than the object to be inspected is added, thereby making it easy to distinguish the object to be inspected.

1 is a flowchart showing a configuration of a method for searching an inspection object on a photographing object according to the first aspect of the present invention.
2 is a block diagram showing a configuration of an apparatus for searching an object to be inspected on a photographing object according to an embodiment of the present invention.
3 is a view showing an example of a manual control unit used in the present invention.
4 is a view showing an example of the arrangement state of the illumination unit and the photographing unit used in the present invention.
5 and 6 are views each showing an example of an illumination unit used in an apparatus for searching an object to be inspected on a photographing object according to the present invention.
7 is a view showing another example of an illumination unit used in a lighting apparatus according to the present invention.
8 is a flowchart showing a configuration of a method for searching an inspection object on a photographing object according to the second aspect of the present invention.

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

1 is a flowchart showing a configuration of a method for searching an inspection object on a photographing object according to the first aspect of the present invention.

Referring to FIG. 1, a method for searching an object to be inspected on a photographing object according to the first aspect of the present invention includes a mode selecting step S110, an object preparing step S120, a white light illuminating step S130, A step S160 of outputting a color value, a step S150 of setting an inspection region, a step S160 of detecting a hue and a color value, a step S170 of illuminating the color illumination, and a step S180 of re-executing.

Here, in the method of searching an object to be inspected on a photographing object according to the first aspect of the present invention, the color of the object to be inspected may be further emphasized, and then the object to be inspected may be searched using the highlighted color.

2 is a block diagram showing a configuration of an apparatus for searching an object to be inspected on a photographing object according to an embodiment of the present invention.

2, the lighting apparatus 100 according to the present invention includes a mode selection unit 110, a manual control unit 120, a communication unit 130, an illumination unit 140, a power supply unit 150, 160, a control unit 170, and a display unit 180.

The present invention will be described with reference to Figs. 1 and 2 at the same time.

The mode selection step S110 is a step of selecting whether to control the illumination of the inspection target by the operator directly or by the control unit 170, which will be described later.

When manually set by the operator, the operator can control the current applied to the illuminating unit, which will be described later, by operating the manual adjusting unit 120. [ 3 is a view showing an example of a manual control unit, which includes an R, G, B, and W adjustment switch 122 operated by a user and a numeric keypad 124 indicating an adjustment amount.

Meanwhile, the power supply unit 150, which will be described later, can be controlled by receiving a control signal from the outside through the communication unit 130 without passing through the manual control unit 120. [ The signal input through the communication unit 130 is input to the power supply unit 150 through a control unit 170 described later.

When the automatic adjustment mode is selected and set by the control unit 170, it may be performed as follows.

The step of preparing the inspection object (S120) is a step of arranging the inspection object (1) in the predetermined table (10). The objects to be inspected can be variously set according to the needs of users, such as industrial products and foods.

4 is a view showing an example of the arrangement state of the illumination unit and the photographing unit used in the present invention.

The table 10 on which the inspection target 1 is disposed can prevent the inspection target 1 from vibrating due to vibrations externally applied while the inspection is proceeding and can prevent the inspection target 1 from moving The table 10 is not limited to a predetermined shape and may be formed in various shapes.

The step of illuminating the white light (S130) illuminates the object to be inspected using the illumination unit 140. Here, the illumination unit 140 used is preferably an LED.

Here, the illumination unit 140 may be a single white LED that emits only white light. However, the red, green, and blue LEDs may be disposed in the illumination unit 140, and white light may be generated by a combination of red, It may be an LED that can illuminate.

5 and 6 are views each showing an example of an illumination unit used in an apparatus for searching an inspection object on a photographing object according to the present invention.

Referring to FIG. 5, a red LED, a green LED, and a blue LED are arranged to emit white light by a combination of R, G, and B lights emitted from the unit LEDs. .

Referring to FIG. 6, the red, green, blue and white LEDs are arranged to emit red, green and blue light in the red, green and blue LEDs. It can be seen that it is an illuminating part capable of illuminating white light or illuminating white light emitted from a W (white) unit LED.

In addition, the illumination unit 140 may have a configuration in which a plurality of unit LEDs are arranged, but may be an LED in which R, G, B, or R, G, B, and W are integrally combined.

7 is a view showing another example of the illumination unit used in the illumination apparatus according to the present invention. The illumination unit may be various shapes according to the needs of the user such as a square, a circle, and a bar size, It is preferable to have a ring shape. The illuminating unit 140 is in the form of a ring, and a photographing unit 160, which will be described later, may be disposed at the center of the illuminating unit 140.

For operation of the illumination unit 140, a power supply unit 150 is used. The power supply unit 150 supplies power to the illumination unit 140 having a predetermined voltage and current so that the illumination unit 140 can emit light. In this case, when the illumination unit 140 includes a plurality of unit LEDs, it is preferable that the power supply unit 150 is configured to individually supply power to each unit LED.

Also, the power supply unit 150 may supply power to the components included in the illumination device 100 according to the present invention.

The predetermined power source is supplied to the illumination unit 140 at the initial stage of operation of the apparatus according to the present invention. However, after the start of the operation, the power source of the power source unit 150 is controlled by the control unit 170, ). ≪ / RTI >

In the step S140 of outputting the photographed object, when illumination is applied to the object to be inspected, the photographed object is photographed and the photographed object is outputted. For performing the step S130 of outputting the photographic object, the photographing unit 160 is applied.

When the illumination unit 140 illuminates the inspection target 1, the photographing unit 160 photographs the inspection target 1 and outputs a photograph. For this purpose, the photographing unit 160 is connected to the power supply unit 150 so that the operation of the power supply unit 150 and the photographing unit 160 can be interlocked. The photographing unit 160 may be disposed in a room immediately above the inspection target 1. [ Also, the photographing unit 160 may be arranged to be movable in the X-axis, Y-axis, and Z-axis directions according to the needs of the user.

It is preferable that the photographing unit 160 is adjusted so that the subject to be inspected is arranged at the center on the photographing object.

Here, the output image may be a color image. Further, in the case of a monochrome image, it can be output after being colorized.

The photographing unit 160 is preferably a digital camera or a digital camera module for outputting photographs in the form of a graphic file immediately after photographing. Therefore, the photographing output from the photographing unit 160 may be a graphic file (for example, jpg, tif, etc.) having a predetermined pixel size (for example, 1024x768).

In the present embodiment, it is preferable that the photographing unit 160 uses a camera which can control the exposure time according to the user's needs and uses a solid-state photographing element such as CCD or CMOS.

Referring again to FIG. 4, the photographing unit 160 may be disposed directly above the inspection target 1 in a state where the inspection target 1 is disposed on the table 10. It is preferable that the illumination unit 140 is ring-shaped or uniformly arranged around the photographing unit 160 so as to be uniformly illuminated with respect to the object 1 to be inspected. In this case, the plurality of lighting units 140 have the same specifications, and each lighting unit 140 is preferably connected to the power supply unit 150 and the current control unit 170, which will be described later.

The step of setting an inspection area (S150) is a step of setting an inspection area of a predetermined area on the output imaged product. The controller 170 is used for performing the step of setting the inspection area (S150). The control unit 170 receives the photographing object output from the photographing unit 160 and sets an inspection area of a predetermined area on the photographing object. Here, it is preferable that the area of the inspection area to be set corresponds to the area of the inspection object.

The color and representative value detection step S160 detects R, G, and B colors and representative values of R, G, and B colors of the subject to be photographed displayed in the set inspection area.

The setting of the color and the detected representative value will be described in more detail.

The control unit 170 sets an inspection area of a predetermined area on the input image, calculates the R, G, and B values of the pixels included in the inspection area, and then obtains the average R, G, and B values of the inspection area The average R, G, and B values can be set to representative R, G, and B values.

Alternatively, the controller 170 obtains the R, G, and B values of each of the pixels included in the inspection region, and then subtracts the values of the R, G, and B values of the inspection region pixels from the R, , G, and B values.

In addition, the R, G, and B values can be set using arithmetic mean, weighted arithmetic mean, geometric mean, harmonic mean, square mean, median select, mode selection, quartile method, .

The control unit 170 outputs a control signal corresponding to the detected hue and representative value to a power supply unit 150 described later.

The step of illuminating the color illumination (S170) controls the brightness and color of the illumination unit 140 according to the control signal output from the control unit 170, and irradiates the controlled illumination. That is, the control unit 170 outputs a predetermined control signal to control the brightness of the illumination unit 140 by controlling the current of the power source that the power supply unit 150 outputs to the illumination unit 140. Here, the brightness of each of the unit LEDs included in the illumination unit 140 is controlled to illuminate light of a required color.

Here, it is preferable that the brightness of the illumination unit 140 is such that the value obtained by removing the achromatic portion from the R, G, and B values detected on the photographing object can enhance the color of the inspection object.

The achromatic color is the smallest R, G, B value of the inspection area set in the photograph, and R ', G' and B 'can be obtained by subtracting the R, G and B values obtained from the smallest value.

For example, if R = 50, G = 80, and B = 150, R '= 0, G' = 30, and B '= 120 are obtained by subtracting R, .

More specifically, if the representative value set in the inspection area is R (red), the power supply unit 150 controls the illumination unit 140 to illuminate R (red). When the light of the illumination unit 140 is illuminated, the color of the inspection object in the inspection area can be further emphasized, but the object other than the inspection object becomes achromatic color such as white and the color is weakened.

In the inspection area, the part appearing in the chromatic color is selected as the inspection target, and the inspection (the inspection of the heat treatment degree) required by the user is performed. Hereinafter, a method of distinguishing achromatic color from achromatic color in the inspection area is well known in the art as disclosed in Japanese Patent Application No. 10-1208575, and therefore, a detailed description thereof will be omitted.

When the object to be inspected is distinguished on the photographed object by the illumination control as described above, the next object to be inspected is prepared and the inspected object is inspected. If the inspection object is not distinguished, the representative color and color (S180) of performing the detection of the value and the illumination control again. Here, the re-execution step S180 does not initialize the illumination, but is performed again in the controlled state in the step S170.

The re-execution step S180 may be repeated until the inspection object can be clearly distinguished in the inspection area.

The display unit 180 may display the brightness of the illumination of the controlled illumination unit 140 as R, G, B or R, G, B, W, respectively, and provide the display brightness to the user. In addition, the display unit 180 can provide a photograph to the user.

When the inspection target can be distinguished on the photograph, it is possible to carry out the necessary work (detection of the heat treatment of the metal, etc.) by using it.

8 is a flow chart showing a configuration of an illumination method according to a second aspect of the present invention.

Referring to FIG. 8, the illumination method according to the second aspect of the present invention includes a mode selection step S210, an inspection object preparation step S220, a white light illumination step S230, a step S240 A step S260 of detecting a color and a color value, a step S270 of detecting a complementary color and a representative value of a complementary color, a step S280 of controlling the brightness of the illumination, (S290).

A detailed description of the same configuration as that of the previous embodiment will be omitted and only differences will be described.

The illumination device implementing the above-described illumination method may be the same as the illumination device used in the previous embodiment, and a detailed description thereof will be omitted.

The step of illuminating the white light (S230) illuminates the white light emitted from the white LED, not the white light caused by the combination of the R, G, and B lights, with respect to the object to be inspected.

The step of detecting a representative value of the complementary color and the complementary color (S270) calculates a complementary color of the color detected in the inspection region, and calculates a representative value of the calculated complementary color. The color of the object to be inspected is suppressed to be achromatic, and the colors of objects other than the object to be inspected are emphasized so that objects other than the object to be inspected and the object to be inspected can be distinguished from each other as a color.

The control unit 170 outputs a control signal corresponding to the calculated complementary value of the complementary color and the complementary color so that the illumination unit 140 is controlled.

Here, the detection of the complementary color can be performed as follows.

When the R, G, and B values of the pixels included in the inspection region and the representative values of the R, G, and B values are obtained in the previous step (S260), the redundant values of the R, G, and B values, that is, . Here, the minimum value is a value corresponding to an achromatic white color, which can be found by the following formula (1).

After obtaining the achromatic color value in Equation (1), a new representative value can be obtained by subtracting the R, G, and B values from the representative values of the R, G, and B values.

This can be obtained by Equations (2) to (4).

By using Equations (1) to (4), a complementary color to a value obtained by subtracting the achromatic color value from the R, G, and B representative values can be obtained. If necessary, the complementary color may be obtained without subtracting the achromatic color value. Here, R, G, and B are cyan, magenta, and yellow, respectively, of complementary colors cyan, magenta, and yellow, b.

The complementary colors can be obtained by the following equations (5) to (7). Equations (5) to (7) can be performed in the case of obtaining complementary colors without considering the achromatic color.

The above equation indicates that a particular color and its complementary color have a phase difference of 180 degrees.

The brightness values r, g and b of the complementary color light sources from the complementary colors Cyan (Cyan), M (Magenta) and Y (Yellow) detected by the above Equations 5 to 7 are calculated by the following Equations 8 to 10 . In this case, the values obtained by removing the achromatic color from the original colors R, G, and B, that is, subtracting the minimum value are referred to as R`, G`, and B`, respectively. The vector directions of r, g, and b are on the R, G, and B axes, respectively, and their sizes are as follows.

The above equation indicates that the color difference is 60 degrees from the neighboring hue.

The illumination unit 140 outputs a control signal corresponding to the r, g, and b values calculated by the above equations. When the power supply unit 150 supplies the current-controlled power according to the control signal, Performs illumination corresponding to the detected complementary color so that the color of the object 1 to be inspected becomes achromatic on the inspection region and the color of the object other than the inspection object can be emphasized.

The present invention is characterized in that, after an object to be inspected is photographed, the object to be inspected on the object is irradiated with light of a color corresponding to the color of the object to be inspected, or light of a color corresponding to the complementary color of the object to be inspected is irradiated, So that the color of the subject other than the subject to be inspected can be emphasized and the subject to be examined can be easily distinguished.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Lighting device
110: Mode selection unit
120: manual control unit
130:
140:
150: Power supply
160:
170:
180:

Claims (12)

Preparing an inspection target;
Illuminating the inspection object with white light;
A step of photographing the object to be inspected and outputting a photographing object;
Setting an inspection area on the photographing object;
Extracting a color of the inspection region and a representative value of the color;
Controlling brightness and color of illumination corresponding to the extracted representative value and examining color illumination according to the controlled brightness and color;
If the inspection target is not distinguished, the control unit illuminates the illumination controlled in the step of illuminating the illumination, and illuminates the captured image output step, the color and representative value extraction step, and the color illumination according to the controlled brightness and color Re-executing the step,
Wherein the step of illuminating the color illumination includes illuminating the color of the inspection target so that the inspection target is distinguished. Preparing an inspection target;
Illuminating the inspection object with white light;
A step of photographing the object to be inspected and outputting a photographing object;
Setting an inspection area on the photographing object;
Extracting a color and a representative value of the inspection area;
Detecting a complementary color of the extracted color and a representative value of the complementary color;
Controlling brightness of the illumination corresponding to the detected complementary color;
Outputting the captured image again, and extracting the color and the color value again,
Wherein the step of detecting the complementary colors comprises the steps of: < EMI ID = 14.0 >
[Equation 1]

Here, W represents a value of white which is an achromatic color
&Quot; (2) "

&Quot; (3) "

&Quot; (4) "

3. The method according to claim 1 or 2,
The white light,
A method for searching an object to be inspected on a photographed object by using color light emitted by a combination of R, G, B illumination units whose brightness is controlled by current control. 3. The method according to claim 1 or 2,
Wherein the brightness control of the illumination is performed by using a color illumination achieved by current control. 3. The method according to claim 1 or 2,
The step of extracting the hue and representative value of the inspection region may include:
Obtaining R, G, and B values of pixels included in the inspection region,
Obtaining an average of the R, G, and B values;
And removing the overlapping achromatic color values from the R, G, and B values. delete 3. The method of claim 2,
Wherein the control of the light source according to the complementary color is performed by using the color illumination performed by the following Equations (8) to (10).
&Quot; (8) "

&Quot; (9) "

&Quot; (10) "

(Where r, g, and b are the brightness of the complementary color light source)
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