KR100999887B1 - Method of setup Color Zone, Method of Color Temperature Detection using Color Zone, Recording Media of the same and Image Apparatus of performing the same - Google Patents

Abstract

Provided are a recording medium recording a color temperature zone, a color temperature detection method using a color temperature zone, a recording medium recording a color temperature detection method using a color temperature zone, and a color temperature detection method using a color temperature zone. The color temperature zone setting method includes setting a color temperature reference line representing a characteristic of a color temperature in a three-dimensional coordinate space; And a color temperature reference line, and may include setting a color temperature zone including a plurality of spatial diagrams. Since the color temperature zone is set in the three-dimensional space, accurate color temperature detection is possible as compared with the use of the two-dimensional space, and it is not sensitive to noise and minimizes interference between colors. As a result, accurate white balance adjustment can be performed according to accurate color temperature detection.

Black Body, Light Source, Color Temperature, Color Temperature Zone, White Balance

Description

Image recording apparatus for recording color temperature using color temperature zones, recording temperature recording method using color temperature zones, color temperature detection method using color temperature zones, and color temperature detection method using color temperature zones. Color Zone, Recording Media of the same and Image Apparatus of performing the same}

The present invention relates to a recording medium for recording a color temperature zone setting method, a color temperature detection method using a color temperature zone, a recording medium recording a color temperature detection method using a color temperature zone, and a color temperature detection method using a color temperature zone. A recording medium recording an improved color temperature zone setting method, a color temperature detection method using a color temperature zone, a color temperature detection method using a color temperature zone, and a color temperature detection method using a color temperature zone.

A black body is a virtual object with a zero reflectance that absorbs 100% of all electromagnetic waves incident on it. In the assumption that it absorbs all light, it is named black object. The concept of blackbody was first used by Gustav Kirchhoff in 1862. However, the ideal black body radiates electromagnetic waves, and the black body emits electromagnetic waves called black body radiation.

The color of light emitted by an ideal blackbody is determined only by temperature according to Planck's law of radiation. When an object is shining with visible light and its color looks like the color of a black body radiating at a certain temperature, the temperature of the black body and the object's temperature are considered to be the same and the temperature is called the color temperature of the object. In other words, the color temperature is a numerical representation of the light of the light source using the properties of the black body.

The color temperature of the object is represented by the temperature of the black body of the same color light. For example, the color of the light bulb is 2800K, the fluorescent light is 4500K-6500K, the noon sun light is 5400K, the cloudy daytime light is 6500 ~ 7000K, and the clear blue sky is 12000 ~ 18000K.

If you capture a white object illuminated by a light source at a certain temperature with the camera, the encoder output of the camera should be in a state where the subcarriers are zero (electrically achromatic). In this way, adjusting the gain of each RGB channel so that the subcarrier becomes '0' according to the color temperature is called adjusting the white balance.

The color temperature zone means a zone containing a characteristic curve for color temperature determination. That is, the color temperature zone is intended to represent one light source, and can be said to set a zone for expressing a specific color temperature. However, in the conventional method of expressing the color temperature zone for measuring the color temperature, a two-dimensional plane is used, which causes a problem of inferior accuracy.

It is an object of the present invention to provide a color temperature zone setting method with improved accuracy.

Another object of the present invention is to provide a color temperature detection method using a color temperature zone with improved accuracy.

It is still another object of the present invention to provide a recording medium recording a color temperature detection method using a color temperature zone with improved accuracy.

It is still another object of the present invention to provide an image pickup device that performs a color temperature detection method using a color temperature zone with improved accuracy.

Color temperature zone setting method for achieving the above object of the present invention comprises the steps of setting a color temperature reference line representing the characteristic of the color temperature in the three-dimensional coordinate space; And a color temperature reference line, and including a color temperature zone configured by a plurality of spatial diagrams.

Here, the three coordinate axes constituting the three-dimensional coordinate space may be represented by any one of an RGB value, a YCrCb value, and a YUV value.

Here, the spatial figure may be characterized by being represented by a minimum value and a maximum value on three coordinate axes constituting the three-dimensional coordinate space, respectively.

Here, the spatial figure may be any one of a rectangular parallelepiped, a cone, a triangular pyramid, a square pyramid, and a cylinder.

Color temperature detection method using a color temperature zone to achieve the above object of the present invention is a color temperature detection method, at least one pixel constituting the image information provided from the image sensor coordinates of the three-dimensional coordinate space Expressed as a value; Whether the pixel is included in the color temperature zone formed by the step of setting a color temperature reference line representing the characteristic of the color temperature in the three-dimensional coordinate space and the color temperature zone including the color temperature reference line, the color temperature zone consisting of a plurality of spatial diagrams Is determined; And determining a color temperature of the provided image information by using the number of pixels included in the color temperature zone.

Here, the three coordinate axes constituting the three-dimensional coordinate space may be represented by any one of an RGB value, a YCrCb value, and a YUV value.

Here, in the step of determining whether the pixel is included in the color temperature zone, comparing whether the three coordinate values of the pixel is included between the minimum value and the maximum value of the three coordinate values of the spatial diagram representing the color temperature zone. It may be characterized in that the inclusion.

Here, the step of determining the color temperature for the provided image information by using the number of pixels included in the color temperature zone is characterized in that the color temperature is determined using a plurality of color temperatures selected in order of the number of pixels. It may be.

The recording medium recording the color temperature detection method using the color temperature zone for achieving the above another object of the present invention is a recording medium in which the color temperature detection method is recorded, at least one pixel constituting the image information provided from the image sensor A color temperature zone comprising a color temperature reference line comprising the step of expressing the coordinate value of the three-dimensional coordinate space, the step of setting a color temperature reference line representing the color temperature characteristic of the pixel in the three-dimensional coordinate space, and the color temperature reference line, And determining a color temperature of the provided image information by using the number of pixels included in the color temperature zone. It may be recorded.

According to another aspect of the present invention, there is provided an image pickup apparatus that performs a color temperature detection method using a color temperature zone, the image pickup apparatus including: an image sensor for providing image information corresponding to a subject; At least one pixel constituting the image information provided from the image sensor is expressed as a coordinate value in a three-dimensional coordinate space, and the pixel is set to a color temperature reference line representing a characteristic of a color temperature in the three-dimensional coordinate space; Determining whether the color temperature zone including a color temperature reference line and including the color temperature zone is included in the color temperature zone formed by setting the color temperature zone and using the number of pixels included in the color temperature zone. A color temperature detector for executing a color temperature detection method, comprising: determining a color temperature for the color temperature; An image processor configured to perform white balance adjustment on the image information by using the detected color temperature; A storage unit for storing the color temperature zone, the number of pixels included in the color temperature zone, and image information; And an output unit for outputting image information after the white balance is adjusted.

Here, the three coordinate axes constituting the three-dimensional coordinate space in the color temperature detector may be represented by any one of an RGB value, a YCrCb value, and a YUV value.

Here, the color temperature detection unit compares whether the three coordinate values of the pixel are included between the minimum value and the maximum value of the three coordinate values of the spatial diagram representing the color temperature zone, and whether the pixel is included in the color temperature zone. May be characterized in that it is determined.

Here, when the color temperature detection unit determines the color temperature for the provided image information by using the number of pixels included in the color temperature zone, the color temperature is determined by using a plurality of color temperatures selected in order of increasing number of pixels. It may be characterized as.

According to the color temperature detection method using the color temperature zone setting method as described above, since the image information transmitted from the image sensor can be used without conversion process, the operation can be minimized, and the color temperature zone is set in the three-dimensional space, thereby utilizing the two-dimensional space. The color temperature can be detected accurately. Therefore, it is not sensitive to noise and can minimize the interference between colors. As a result, accurate white balance adjustment can be performed according to accurate color temperature detection.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description.

However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In the following description of the present invention, the same reference numerals are used for the same elements in the drawings and redundant descriptions of the same elements will be omitted.

1 is a flowchart illustrating a method for setting a color temperature zone according to an embodiment of the present invention.

1, a color temperature zone setting method according to an embodiment of the present invention comprises the steps of setting a color temperature reference line representing the characteristic of the color temperature in the three-dimensional coordinate space (S110); And a color temperature zone including the color temperature reference line and setting a color temperature zone formed of a plurality of spatial diagrams (S120).

First, the three-dimensional coordinate space is proposed to overcome the limitation in the case of expressing the color temperature zone in two-dimensional coordinates, the three coordinate axes constituting the three-dimensional coordinate space is any one of the RGB value, YCrCb value and YUV value It can be characterized by the value represented by. That is, if the image information received from the image sensor is represented by the RGB value, it is possible to express the color temperature zone using the RGB three-dimensional coordinate space without further processing. In addition, when Bayer image information represented by YCrCb and YUV values is input from an image sensor, a three-dimensional coordinate space representing YCrCb and YUV values may be used.

Next, in step S110, in which the color temperature reference line indicating the characteristic of the color temperature in the three-dimensional coordinate space is set, a color temperature reference line corresponding to the characteristic of each light source is created for a specific region of the three-dimensional coordinate space. The color temperature reference line may be a straight line or a curve located in the three-dimensional coordinate space by the theoretical calculated value. It may also be a straight line or curve located in a three-dimensional coordinate space based on experimental data.

Next, the step S120 of setting the color temperature zone including the color temperature reference line and consisting of a plurality of spatial figures is to set the color temperature zone including the color temperature reference line, and the color temperature zone is represented by a plurality of spatial figures. Say something. That is, since there is a limit to expressing the color temperature reference line located in the three-dimensional coordinate space in one spatial diagram, the color temperature zone including the color temperature reference line is represented using a plurality of spatial plots. As the color temperature zone including the color temperature reference line is represented using a plurality of spatial plots, the calculation process may be simplified and simplified when determining whether the pixel includes the color temperature zone. Also, the number of spatial plots and the size of the spatial plots may vary depending on the precision of the color temperature zone.

For example, if the color temperature zone is to be precisely set, the boundary of the color temperature zone close to the distance from the color temperature reference line should be set, so that the number of spatial figures is large and the size of the spatial figures is small. On the contrary, if the color temperature zone is to be set wider, the boundary of the color temperature zone should be set from the color temperature baseline to the area farther away, so that the number of spatial figures is smaller and the size of the spatial figures can be increased.

2 is an exemplary view of setting a color temperature zone according to a light source according to an embodiment of the present invention.

Referring to FIG. 2, a spatial diagram for representing a color temperature zone according to a light source according to an exemplary embodiment of the present invention may be a spatial diagram of various forms according to a three-dimensional coordinate space. That is, when the three-dimensional coordinate space is any one of a rectangular coordinate system, a cylindrical coordinate system, a spherical coordinate system and a comb coordinate system, it is a spatial diagram that can be simply expressed by each coordinate system. For example, if the three-dimensional coordinate space is represented by a Cartesian coordinate system, the plurality of spatial figures may be rectangular parallelepipeds, and when expressed in a cylindrical coordinate system, the plurality of spatial figures are within the minimum and maximum values of the radius, It may be a pillar included in a certain range, if it is expressed in the spherical coordinate system, it may be in the shape of an onion shell with a thickness.

In addition, the spatial figure may be represented by a minimum value and a maximum value on three coordinate axes constituting the three-dimensional coordinate space, respectively. That is, it may have a feature of a spatial diagram that can be simply expressed so as to be included in the color temperature zone if it falls within the minimum and maximum values in each axis according to the type of the three-dimensional coordinate space. In addition, the spatial figure may be any one of a rectangular parallelepiped, a cone, a triangular pyramid, a square pyramid, and a cylinder.

For example, when the three-dimensional coordinate space is an orthogonal coordinate system with RGB as the respective axis, the color temperature is arranged along the color temperature reference line using a plurality of rectangular parallelepipeds formed by lines parallel to each axis including the color temperature reference line. You can express a zone. Therefore, when contrasting the RGB value of the pixel received from the image sensor, it may be determined whether it is included in the rectangular parallelepiped only by the minimum and maximum values along each axis of each rectangular parallelepiped. That is, when one rectangular parallelepiped representing the color temperature zone satisfies 3 ≦ r ≦ 5 on the R axis, 4 ≦ g ≦ 5 on the G axis, and 4 ≦ r ≦ 6 on the B axis, If the RGB value of the pixel corresponds to (4, 5, 5), it can be easily seen that it belongs to the inside of the rectangular parallelepiped, and the calculation process can be simply processed.

3 is a flowchart illustrating a color temperature detection method using a color temperature zone according to an embodiment of the present invention.

Referring to FIG. 3, in the color temperature detection method using a color temperature zone according to an embodiment of the present invention, at least one pixel constituting image information provided from an image sensor is a three-dimensional coordinate in a color temperature detection method. Represented by coordinate values of the space (S210); Whether the pixel is included in the color temperature zone formed by the step of setting a color temperature reference line representing the characteristic of the color temperature in the three-dimensional coordinate space and the color temperature zone including the color temperature reference line, the color temperature zone consisting of a plurality of spatial diagrams Is determined (S220); And determining a color temperature of the provided image information by using the number of pixels included in the color temperature zone (S230).

First, step S210 in which at least one pixel constituting the image information provided from the image sensor is expressed as a coordinate value of the three-dimensional coordinate space is performed for each pixel constituting the image information provided from the image sensor. It may be expressed as a coordinate value of. That is, if the three-dimensional coordinate space is represented by the RGB coordinate system, it can be expressed as having (3,6,10) as the RGB value for each pixel constituting the image information.

Here, the image information provided from the image sensor may be represented by a Bayer pattern in units of pixels. In this case, in order to represent each pixel as one point located in the three-dimensional coordinate space, a Gaussian filter or a mean filter may be used by applying an interpolation method. That is, since the pattern of the image information initially provided from the image sensor has only one value among the RGB values, it is expressed as a pixel having three RGB components using a Gaussian filter and an average filter.

For example, when image information input from an image sensor is processed in a pixel unit of 5X5 range, if the pixel located in the center has only R component, the average of R values of pixels in the 5X5 range with respect to the R value The R component value can be taken by taking a filter value or a Gaussian filter value that is weighted. A Gaussian filter value can be obtained by dividing Gr and Gb by weight for a G value, and a Gaussian that also weights a B value. It may be expressed using a filter value or using an average filter value.

4 is a conceptual diagram illustrating an interpolation method in a color temperature detection method using a color temperature zone according to an embodiment of the present invention.

Referring to FIG. 4, in the method of detecting color temperature using a color temperature zone, a Gaussian filter value and an average filter value are applied to all pixels to have RGB values by applying an interpolation method for image information received from an image sensor. It can be seen that using.

In the case of a centrally located R pixel, the pixel has only an R value, but may have both RGB values by applying an interpolation method. The R value can be calculated by applying a Gaussian filter by multiplying the value of R5 at the center of the 5X5 range by 4 and the weight of 2 at the R2, R4, R6, and R8 values near the center. In the case of the G value, Gr (G1 ~ G6) and Gb (G7 ~ G12) can be distinguished and calculated. Therefore, the G value can be calculated by multiplying the weights 2 by the relatively centered G3, G4, G8 and G9. In addition, in the case of the B value, it may be calculated by applying the same weight to B1, B2, B3, and B4 using the average filter, not the Gaussian filter.

Referring back to FIG. 3, next, the pixel is configured to set a color temperature reference line indicating a characteristic of the color temperature in the three-dimensional coordinate space and the color temperature zone including the color temperature reference line and configured with a plurality of spatial figures. In operation S220, it may be determined whether each pixel constituting the image information is included in the color temperature zone to increase the pixel counter of the corresponding light source. In addition, the average value may be calculated by adding all RGB values of pixels included in the color temperature region. Here, the three coordinate axes constituting the three-dimensional coordinate space may be represented by any one of an RGB value, a YCrCb value, and a YUV value, and whether the pixel is included in the color temperature zone. In the step of determining whether the three coordinate values of the pixel is included between the minimum value and the maximum value of the three coordinate values of the spatial diagram representing the color temperature zone can be characterized in that inclusion is determined. .

For example, when one rectangular parallelepiped representing a color temperature zone satisfies 9 ≦ r ≦ 11 in the R axis, 4 ≦ g ≦ 6 in the G axis, and 15 ≦ r ≦ 16 in the B axis. If the RGB value of the corresponding pixel corresponds to (10,5,15), it is included in the color temperature zone represented by the rectangular parallelepiped, and increases the pixel counter of the corresponding light source by one, and the RGB average value of the corresponding pixel to the RGB average value of the corresponding light source. It may reflect the value (10,5,15).

Next, in the step S230 of determining the color temperature of the provided image information by using the number of pixels included in the color temperature zone, the pixel counter included in the color temperature zone of each light source is compared with the largest number of pixels. Selecting a light source having a counter, it may be to determine the color temperature corresponding to the light source. Here, the step of determining the color temperature for the provided image information by using the number of pixels included in the color temperature zone is characterized in that the color temperature is determined using a plurality of color temperatures selected in order of the number of pixels. Can be. That is, the pixel counter included in the color temperature zone may be selected to include two or three light sources including one selected as a light source. In this case, the color temperature may be determined by taking the average of the RGB average values of the selected light source again.

For example, when only one light source is selected, the color temperature corresponding to the corresponding RGB average value may be determined as the color temperature for the corresponding image information. When three light sources are selected, the color temperature corresponding to the RGB average value of the light source having the most pixel counter is the most. With the weighted value, the RGB average value of the light source with the second large pixel counter is given a medium weight to obtain the RGB average value of the entire selected light source, and the color temperature corresponding to the RGB value may be determined as the color temperature for the corresponding image information. .

5 is a block diagram illustrating an image capturing apparatus using a color temperature zone according to an exemplary embodiment of the present invention.

Referring to FIG. 5, in the image capturing apparatus 500 using the color temperature zone according to an embodiment of the present invention, an image sensor 510 for providing image information corresponding to a subject in an image capturing apparatus performing a color temperature detection method ; At least one pixel constituting the image information provided from the image sensor is expressed as a coordinate value in a three-dimensional coordinate space, and the pixel is set to a color temperature reference line representing a characteristic of a color temperature in the three-dimensional coordinate space; Determining whether the color temperature zone including a color temperature reference line and including the color temperature zone is included in the color temperature zone formed by setting the color temperature zone and using the number of pixels included in the color temperature zone. A color temperature detector 520 for executing a color temperature detection method, comprising: determining a color temperature for the color temperature; An image processor 530 for performing white balance adjustment on the image information by using the detected color temperature; A storage unit 540 for storing the color temperature zone, the number of pixels included in the color temperature zone, and image information; And an output unit 550 for outputting image information after the white balance is adjusted.

First, the image sensor 510 for providing image information corresponding to a subject receives image information, which is reflected light in the subject and transmitted to the image sensor, that is, image information including reflected waves in the visible light region, as pixel information. It may be. Image information input from the image sensor may be a target of color temperature detection.

Next, at least one pixel constituting the image information provided from the image sensor is represented by a coordinate value of a three-dimensional coordinate space, the color temperature reference line is set to indicate that the pixel is a characteristic of the color temperature in the three-dimensional coordinate space And determining whether the color temperature zone including the color temperature reference line and including the color temperature reference line is included in the color temperature zone formed by setting the color temperature zone and the number of pixels included in the color temperature zone. The color temperature detection unit 520 for executing the color temperature detection method including the step of determining the color temperature of the received image information includes the color temperature of the image information received from the image sensor through the color temperature detection method as described above. To detect. Here, the three coordinate axes constituting the three-dimensional coordinate space may be represented by any one of an RGB value, a YCrCb value, and a YUV value, wherein the three coordinate values of the pixel are the color temperature zone. It may be determined whether or not the pixel is included in the color temperature zone by comparing whether it is included between the minimum value and the maximum value of the three coordinate values of the spatial figure representing the space temperature, and using the number of pixels included in the color temperature zone. When the color temperature of the received image information is determined, the color temperature may be determined using a plurality of color temperatures selected in order of the number of pixels.

Next, the image processing unit 530 that performs white balance adjustment on the image information by using the detected color temperature reflects the color temperature detected by the color temperature detection unit 520 to compensate for the difference from the color temperature of the standard position. Will give. Accordingly, the white balance of the image information can be adjusted.

Next, the storage unit 540 for storing the color temperature zone, the number of pixels included in the color temperature zone, and image information stores information about the color temperature zone, that is, the number of pixels included in the color temperature zone, that is, the pixel counter. It may store the, the RGB average value of the pixel included in the color temperature zone, and may store the value of the pixel constituting the image information.

Next, the output unit 550 for outputting the image information after the white balance adjustment may be an apparatus for outputting the image information after the white balance adjustment to the image information as a screen and a document. For example, an LCD screen of a digital camera may correspond to the output unit 550.

6 is a conceptual diagram for explaining color temperature detection and white balance using a color temperature zone according to an embodiment of the present invention.

Referring to FIG. 6, color temperature detection and white balance using a color temperature zone according to an embodiment of the present invention are expressed in a three-dimensional coordinate space using an interpolation method of pixel units for image information through an image sensor. It can be expressed as an RGB value. Subsequently, it is determined whether each pixel of the corresponding image information is included in a space of a preset color temperature zone. Here, since the color temperature zone may be set for each light source, the preset color temperature zone information may have at least one color temperature zone. It is determined whether each pixel constituting the image information is included in a specific color temperature zone, and if included, the pixel counter corresponding to the color temperature zone of the corresponding light source is increased, and the RGB value of the pixel is converted to the color temperature zone of the corresponding light source. Reflect on the RGB average value. Subsequently, one with the largest number of pixel counters or several light sources with many pixel counters are selected and given an average or weight to recalculate the RGB values. The color temperature of the corresponding light source is detected using the calculated RGB value. Subsequently, the white balance is adjusted for the image information using the detected color temperature to display the image information through a screen or the like.

Although described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

1 is a flowchart illustrating a method for setting a color temperature zone according to an embodiment of the present invention.

2 is an exemplary view of setting a color temperature zone according to a light source according to an embodiment of the present invention.

3 is a flowchart illustrating a color temperature detection method using a color temperature zone according to an embodiment of the present invention.

4 is a conceptual diagram illustrating an interpolation method in a color temperature detection method using a color temperature zone according to an embodiment of the present invention.

5 is a block diagram illustrating an image capturing apparatus using a color temperature zone according to an exemplary embodiment of the present invention.

6 is a conceptual diagram for explaining color temperature detection and white balance using a color temperature zone according to an embodiment of the present invention.

Description of the Related Art

510: image sensor 520: color temperature detector

530: Image processing unit 540: Storage unit

550: output unit

Claims (13)

delete delete delete delete In the color temperature detection method, Expressing at least one pixel constituting the image information provided from the image sensor as a coordinate value in a three-dimensional coordinate space; Whether the pixel is included in the color temperature zone formed by the step of setting a color temperature reference line representing the characteristic of the color temperature in the three-dimensional coordinate space and the color temperature zone including the color temperature reference line, the color temperature zone consisting of a plurality of spatial diagrams Is determined; And And determining a color temperature of the provided image information by using the number of pixels included in the color temperature zone. The method of claim 5, And three coordinate axes constituting the three-dimensional coordinate space are represented by any one of an RGB value, a YCrCb value, and a YUV value. The method of claim 5, In the step of determining whether the pixel is included in the color temperature zone, whether the three coordinate values of the pixel are included between the minimum value and the maximum value of the three coordinate values of the spatial figure representing the color temperature zone is compared. Color temperature detection method characterized in that it is determined. The method of claim 5, The determining of the color temperature of the provided image information by using the number of pixels included in the color temperature zone, the color temperature is determined using a plurality of color temperatures selected in order of the number of pixels. In a recording medium on which a color temperature detection method is recorded, At least one pixel constituting the image information provided from the image sensor is expressed as a coordinate value in a three-dimensional coordinate space, a step of setting a color temperature reference line indicating the characteristic of a color temperature in the three-dimensional coordinate space, and the color temperature Determining whether or not the color temperature zone includes a reference line and is included in the color temperature zone formed by the step of setting the color temperature zone; and using the number of pixels included in the color temperature zone in the received image information. And a color temperature detection method, comprising: determining a color temperature for the recording medium. An imaging device that performs a color temperature detection method, An image sensor for providing image information corresponding to a subject; At least one pixel constituting the image information provided from the image sensor is expressed as a coordinate value in a three-dimensional coordinate space, and the pixel is set to a color temperature reference line representing a characteristic of a color temperature in the three-dimensional coordinate space; The image information is received using a number of pixels included in the color temperature zone, including determining a color temperature zone formed by the step of setting a color temperature zone including a color temperature reference line and comprising a plurality of spatial diagrams. A color temperature detector for executing a color temperature detection method, comprising: determining a color temperature for the color temperature; An image processing unit which performs white balance adjustment on the image information by using the detected color temperature; A storage unit for storing the color temperature zone, the number of pixels included in the color temperature zone, and image information; And And an output unit for outputting image information after the white balance adjustment. The method of claim 10, And three coordinate axes constituting the three-dimensional coordinate space in the color temperature detector are represented by any one of an RGB value, a YCrCb value, and a YUV value. The method of claim 10, The color temperature detection unit determines whether the pixel is included in the color temperature zone by comparing whether the three coordinate values of the pixel are included between the minimum value and the maximum value of the three coordinate values of the spatial diagram representing the color temperature zone. An imaging device, characterized in that. The method of claim 10, When the color temperature detection unit determines the color temperature for the provided image information by using the number of pixels included in the color temperature zone, the color temperature is determined by using a plurality of color temperatures selected in order of increasing number of pixels. Imaging device.

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