KR20070053073A - Display apparatus and control method thereof - Google Patents

Abstract

The present invention relates to a display apparatus having a display unit for displaying an image, the display apparatus comprising: an image processing unit which processes an image so that an image corresponding to an input image signal is displayed on the display unit; A color converting unit converting the image signal so that an area mapped to a predetermined color coordinate of the image signal processed by the image processing unit is enlarged or reduced along a predetermined direction; And a control unit controlling the color conversion unit so that the enlargement or reduction of the area is adjusted according to the user's adjustment. As a result, it is possible to simplify the process of adjusting the specific color of the image, thereby providing a display device that increases the processing speed.

Display device, color space, color coordinates, color tone

Description

DISPLAY APPARATUS AND CONTROL METHOD THEREOF}

1 is a block diagram briefly illustrating a configuration of a display apparatus according to an embodiment of the present invention.

2 illustrates a color gamut mapped to UV color coordinates of an image signal,

3 is a flowchart illustrating an operation of a display apparatus according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: display device 110: display unit

120: user input unit 130: signal receiving unit

140: OSD generation unit 150: Demodulation unit

160: demultiplexer 170: color conversion unit

180: scaler 190: control unit

The present invention relates to a display apparatus, and more particularly, to a display apparatus for simplifying a process of adjusting a specific color of an image and increasing a processing speed.

A display device having a display unit for transmitting visual information such as a TV (TeleVision), a digital TV (DTV), a thin film transistor (TFT) monitor, a digital camera, a projector, etc., wherein the display state of an image displayed on the display device is adjusted. The method is generally applied to a method of processing attributes such as Hue, Lightness, Saturation, etc. of an image signal applied to the display device. For example, the color of the image displayed on the display apparatus is adjusted by increasing or decreasing the saturation and / or color component of the colored portion of the image signal applied to the display apparatus.

According to the conventional display apparatus, a color gamut recognized by the user's eye in a two-dimensional space on a color coordinate as a color to be changed by the user in the form of an ellipse, and the user prefers the desired color of the center of the set elliptic area. When set to move to, each color in the ellipse was adjusted in a way that shifted accordingly. According to this conventional technique, it is determined whether an input pixel is included in a color gamut of a color to be changed, and filters pixels that are excessively far from the color gamut.

According to this conventional technology, when considering the two-dimensional spatial concept on the color coordinate, the calculation must be made in two directions, and there is a problem that a complicated equation is required.

Accordingly, an object of the present invention is to solve the above problems, and to provide a display device that simplifies the process of adjusting a specific color of an image and increases processing speed.

In order to achieve the above object, the present invention provides a display apparatus having a display unit for displaying an image, comprising: an image processing unit for processing an image corresponding to an input image signal to be displayed on the display unit, and image processing from the image processing unit; A color conversion unit for converting the video signal so that an area mapped to a predetermined color coordinate of the image signal is enlarged or reduced along a predetermined direction, and the color conversion unit for adjusting the enlargement or reduction of the area according to a user's adjustment It provides a display device comprising a control unit for controlling.

Here, the direction in which the area is enlarged or reduced may be changed according to the color.

In addition, the color coordinates are preferably YUV coordinates.

In addition, the enlargement or reduction of the region is preferably performed by the following Equation 1 to Equation 4.

[Equation 1]

(Wherein Y, U and V denote coordinate values in YUV coordinates of the video signal data to be converted, and Y ', U' and V 'denote coordinate values after conversion.)

[Equation 2]

(However, the θ value represents the angle between the V axis in the YUV coordinates and a predetermined direction in which the area is reduced or enlarged.)

[Equation 3]

[Equation 4]

According to an aspect of the present invention, there is provided a control method of a display apparatus having a display unit for displaying an image, the method comprising: performing image processing such that an image corresponding to an input image signal is displayed on the display unit; And converting the video signal such that an area mapped to the color coordinate of the image is enlarged or reduced along a predetermined direction.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 is a block diagram schematically showing the configuration of a display apparatus 100 according to an embodiment of the present invention, Figure 2 shows a color gamut mapped to the UV color coordinate of the image signal, Figure 3 is a view of the present invention 1 is a flowchart illustrating an operation of the display apparatus 100 according to an exemplary embodiment. 1, 2 and 3 will be described in detail an embodiment of the present invention.

The display apparatus 100 according to the present exemplary embodiment receives and processes a broadcast signal from a broadcasting station and displays the same on the display 110. The display apparatus 100 according to the present embodiment includes a display 110, a user input 120, a signal receiver 130, an OSD generator 140, a demodulator 150, a demultiplexer 160, and a color converter. 170, a scaler 180, and a controller 190.

The display unit 100 according to the present exemplary embodiment receives an image signal output from the color converter 150 and displays an image on the screen based on the image signal. The display unit 100 includes a display module such as a cathode ray tube (CRT), a digital light processing (DLP), a liquid crystal display (LCD), a plasma display panel (PDP), etc., on which an image is displayed, and a color conversion unit 150. It includes a module driver for processing the input image signal to display the image on the display module. When the display module is DLP, the module driver includes an optical engine. When the display module is an LCD, the module driver includes a printed circuit board for converting an image signal input from the color converter 170 into a data signal and a gate signal. Done. As such, the display 110 may have a configuration of a corresponding module driver according to the type of each display module.

The user input unit 120 according to the present embodiment receives a predetermined instruction from the user and transfers it to the controller 190. The user input unit 120 may include a channel up / down key of the display apparatus 100, a numeric key for selecting a broadcast channel, a menu key provided in a remote controller or a casing, and a key signal generator for generating a key signal in response to a key operation. It may include. The user input unit 120 receives a command from the user to perform a so-called MCC (my color control) function of adjusting a TINT and saturation of a specific color through a predetermined menu key, and transmits it to the controller 190.

The signal receiver 130 according to the present embodiment tunes the received broadcast signal to a broadcast signal having a frequency band corresponding thereto according to a channel selected by the user and outputs the broadcast signal to the demodulator 150. The signal receiver 130 may include a tuner. The OSD generator 140 of the present exemplary embodiment provides a user interface for color conversion of colors distributed in a color gamut under the control of the controller 190. The user interface according to the present invention includes a color control unit operated on a screen, and a converted image display window on which the converted image is displayed. The user adjusts the color controller to convert the colors distributed in the color gamut.

The demodulator 150 according to the present embodiment outputs the broadcast signal input from the signal receiver 130 in the form of a transport stream through a demodulation process and an error correction process. The demultiplexer 160 according to the present embodiment separates the broadcast signal input from the demodulator 150 into a video signal, an audio signal, and various additional data, and outputs the bit signal.

The color converter 170 of the present exemplary embodiment converts the video signal such that an area mapped to a predetermined color coordinate of the video signal input from the demultiplexer 160 is enlarged or reduced along a predetermined direction. Color coordinates are a way of representing colors logically, representing all colors on a coordinate system. In the present embodiment, YUV color coordinates are applied, but other color coordinates are also applicable. YUV color coordinates are used in the PAL system of television broadcasting as a color coordinate in the form of dividing the color into the brightness component Y, the color component U and V in view of the fact that the human eye is more sensitive to the brightness than the color.

2 illustrates a color gamut mapped to UV color coordinates of an image signal. An example of a color conversion process by the color conversion unit 170 according to the present invention will be described in detail with reference to FIG. 2. In this embodiment, color conversion is performed on the skin color.

 A color gamut is defined by a set of multiple colors on a color coordinate. The color conversion unit 170 recognizes the color gamut by the geometric equation of the color gamut on the color coordinate system. For example, when the color gamut has an elliptic shape on the UV coordinate system, the color converter 170 may recognize the color gamut by an elliptic equation.

Also, the color gamut may include a memory color gamut defined based on a distribution of memory colors recognized for one object. Here, the memory color means a color perceived with respect to a specific object, such as an object familiar in people's long-time memories, and examples thereof include a skin color, a sky color, and a full color.

In order to perform the color conversion, the color gamut is reduced or enlarged along the direction in which the color gamut of the color to be converted is located and the axis crossing the origin of the UV coordinate axis.

In this embodiment, color conversion is performed on the skin color. The skin color is located at a point in the -33 'direction with respect to the V axis on the color coordinate. First, the coordinate axis is moved by 33 ㅀ, and the color gamut C1 to be converted is expanded along the I axis, which is the direction in which the skin color is located, of the I and Q axes that are moved in correspondence with the U axis and the V axis. . After the color gamut C2 extended in the I-axis direction is obtained, the color gamut on the final converted YUV color coordinate is obtained by axial shifting by -33 ㅀ again.

The axis shift of the U and V coordinates to the I and Q coordinates is calculated by [Equation 1].

[Equation 1]

,

,

Here, θ is the angle in the direction in which the color gamut of the color to be converted is located, and θ = 33 ° in this embodiment.

The color gamut is expanded along the I-axis converted by the above equation coinciding with the direction of the color gamut of the skin color. This is calculated by [Equation 2].

[Equation 2]

Here, I 'is the I coordinate value of the converted color gamut.

At this time, the difference D between the color gamut C1 before the conversion and the color gamut C2 after the conversion depends on the conversion coefficient K value. According to the degree of change of the K value, the extent of the color gamut is also changed, and thus the color of the image is converted. In the present embodiment, the color of the skin is converted into color. For example, if K = 1.5, a skin color with red light is displayed, and if K = 0.5, a skin color with yellow light is displayed.

The -θ ° axis shift of the converted I 'and Q' into the U and V coordinate axes is calculated by [Equation 3].

[Equation 3]

,

,

 The above [Formula 1]-[Formula 3] are the same as [Formula 4] and [Formula 5].

[Equation 4]

[Equation 5]

Finally, the conversion of the YUV color coordinates to the RGB color coordinates is calculated by [Equation 6]-[Equation 9].

[Equation 6]

[Equation 7]

(Eq. 8)

(9)

The color conversion unit 170 converts the image signal as described above and outputs the image signal to the scaler 180.

The scaler 180 of the present exemplary embodiment converts the image signal received from the color converter 170 to match the vertical frequency, resolution, aspect ratio, and the like of the output standard of the display 110.

The controller 190 of the present exemplary embodiment may include a display 110, a user input 120, a signal receiver 130, an OSD generator 140, a demodulator 150, a demultiplexer 160, and a color converter ( 170 and overall control of the function of the scaler 180. The controller 190 may enlarge or reduce the area mapped to the color coordinates of the image signal along the direction of the color gamut to be converted based on the input signal input through the user input unit 120. 170).

3 is a flowchart illustrating an operation of the display apparatus 100 according to an exemplary embodiment of the present invention. Referring to Figure 3 will be described in detail the operation of the display apparatus 100 according to an embodiment of the present invention.

The controller 190 controls the signal receiver 130, the demodulator 150, and the demultiplexer 160 to perform image processing on the input broadcast signal (S10). The controller 190 controls the OSD generator 140 to provide a user interface for color conversion of colors distributed in the color gamut based on an input signal from the user input unit 120, and displays the display 110. Mark on.

The user instructs color conversion for a specific color through the user input unit 120 based on the information displayed on the display 110. The color conversion unit 170 shifts the YUV coordinate axis by a predetermined angle based on the position of the color gamut of the color to be converted, reduces or expands the color gamut according to the instructions of the control unit 190, and then again the first YUV. The axis is moved to the coordinate axis (S14). The color conversion unit 170 outputs the image signal converted in accordance with the process S14 to the scaler 180, and the scaler 180 displays the input signal on the display 110 in a proper form (S16). .

As mentioned above, the present invention has been described in detail through preferred embodiments, but the present invention is not limited thereto and may be variously implemented within the scope of the claims.

As described above, according to the present invention, by extending or contracting an area mapped to a color coordinate of an image signal along a predetermined direction, a display for increasing processing speed by simplifying a process of adjusting a specific color of an image displayed on a display unit. A device can be provided.

Claims (5)

In the display device having a display unit for displaying an image, An image processor which processes an image so that an image corresponding to an input image signal is displayed on the display unit; A color converting unit converting the image signal so that an area mapped to a predetermined color coordinate of the image signal processed by the image processing unit is enlarged or reduced along a predetermined direction; And a control unit controlling the color conversion unit so that the enlargement or reduction of the area is adjusted according to a user's adjustment. The method of claim 1, The display device, characterized in that the direction in which the area is enlarged or reduced in accordance with the color. The method according to claim 1 and 2, And the color coordinates are YUV coordinates. The method of claim 3, A display device according to claim 1, wherein the enlargement or reduction of the area is performed by Equation 1 to Equation 4. [Equation 1]

(Y, U and V denote coordinate values in the YUV coordinates of video signal data to be converted, and Y ', U' and V 'denote coordinate values after conversion.) [Equation 2]

(However, the θ value represents the angle between the V axis in the YUV coordinates and a predetermined direction in which the area is reduced or enlarged.) [Equation 3]

[Equation 4]

In the control method of the display device having a display unit for displaying an image, Image processing to display an image corresponding to an input image signal on the display unit; And converting the video signal such that an area mapped to a predetermined color coordinate of the image processed video signal is enlarged or reduced along a predetermined direction.

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