Patent Publication Number: US-2005140693-A1

Title: Display system

Description:
CROSS-REFERENCE TO RELATED APPLICATION  
      This application claims the benefit of Korean Patent Application No. 2003-60946, filed Sep. 1, 2003, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.  
     BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to a display system, and more particularly, to a display system which converts a color distributed only in a particular color area of a color space, a method of operating, and a user interface method thereof.  
      2. Description of the Related Art  
      Display apparatuses, especially color display apparatuses, are widely used in display devices to present information in a visual form. Examples of display devices that utilize display apparatuses include TVs, DTVs (Digital TVs), projectors, TFT (Thin Film Transistor) monitors, TFT TVs, color printers, digital cameras, cell phones, and so on.  
      Generally, in a conventional display apparatus the condition of displayed images is controlled by changing the properties of hue, brightness, and saturation of an image signal supplied to the display apparatus. For example, the color of an image displayed in a display apparatus can be controlled by increasing or decreasing the saturation and/or hue (color) components of a colored portion of the image signal input to the display apparatus.  
      However, when the color components and/or saturation of a certain color is changed, the color components and/or saturation of all the colors displayed in the display apparatus are changed. For example, when the property settings of a color are changed to increase a red component and decrease saturation for only a skin-tone color in an image displayed in the display apparatus, the entire color of the image displayed therein, including the skin-tone color and other colors associated with a background image are affected. That is, in a conventional display apparatus, changing a certain color of an image, such as the skin-tone color, results in unexpected changes to the rest of the image.  
     SUMMARY OF THE INVENTION  
      Accordingly, it is an aspect of the present invention to provide a display system which is capable of changing one or more color components and/or the saturation of a predetermined color, for example, a skin-tone color, a sky-blue color, or a grass/tree-green color, without affecting the other colors, and therefore, without affecting the rest of the image. That is, it is an aspect of the present invention to provide a display apparatus which changes a color distributed in a certain color area in a color space according to a user&#39;s taste or a predetermined setting provided thereto, for example, via the Internet.  
      Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.  
      To achieve the above and/or other aspects of the present invention, there is a display system to display an image having a color area, the image resulting from an image signal, the display system including a color converter which converts the image signal to change a color distributed in the color area in a color space and the color is changed within the color area of the image.  
      According to an aspect of the present invention, the color area is grouped by a plurality of colors and is formed as one of a variety of geometric shapes including complex geometric shapes in the color space.  
      According to an aspect of the present invention, the color converter sets a predetermined color in the color area as a standard color, and determines a conversion degree in color of the other colors in the color area based on a conversion degree in color of the standard color.  
      According to an aspect of the present invention, the color space may include a YCbCr color space, a CIELAB (Commission International de Eclairage) (L*a*b*) color space, or a CIELUV (L*u*v*) color space.  
      According to an aspect of the present invention, the color converter changes one or more color components and/or the saturation of the color area without affecting the rest of the image.  
      According to an aspect of the present invention, the image signal includes a luminance signal and a chrominance signal, and the color converter converts the chrominance signal to change the color in the color area.  
      According to an aspect of the present invention, the color area may be a memorial color area having memorial color components, the memorial color area being the color of a certain object/thing that a user of a predetermined region is accustomed to and/or perceives as the color of the object/thing.  
      According to an aspect of the present invention, the color area is an ellipse-like shape in the color space.  
      According to an aspect of the present invention, the display system further includes a user interface generator, which provides one or more user interface components to visually confirm and accommodate the change of color distributed in the color area.  
      According to an aspect of the present invention, the display system further includes a user input which operates one or more of the user interface components and generates a key signal to convert the color in the color area.  
      According to an aspect of the present invention, the display system further includes a controller which controls the display system, the controller adopting one or more image components of the image and/or one or more components obtained via a network, as one or more of the user interface components. According to an aspect of the present invention, the color converter changes the color distributed in the color area according to a predetermined setting obtained via a network.  
      To achieve the above and/or other aspects of the present invention, there is a display system to display an image having one or more color areas, the image resulting from an image signal, the display system including a color converter which processes the image signal to change colors distributed in the color areas in a color space of the image, and a user interface generator which provides one or more user interface components to accommodate the color change in the respective color areas.  
      According to an aspect of the present invention, the user interface generator provides one or more color control bars and a converted image display window having one or more converted images that correspond to the one or more color areas, so as to visually confirm and accommodate the change of colors distributed in the color areas by operating the respective color control bars.  
      According to an aspect of the present invention, the user interface generator provides one or more converted image display windows that correspond to the one or more color areas, and each of the converted display windows includes a converted image and a color control bar so as to visually confirm and accommodate the change of colors distributed in the color areas by operating the respective color control bars. According to an aspect of the present invention, the user interface generator further provides one or more standard image display windows corresponding to the one or more color areas, and each of the standard image display windows includes a standard image that corresponds to a respective one of the converted images so as to visually facilitate a before and after comparison.  
      According to an aspect of the present invention, the color converter changes one or more color components of a selected one of the color areas without affecting the rest of the color areas and/or the image. According to an aspect of the present invention, the color areas include skin-tone color, sky-blue color and grass/tree-green color areas.  
      According to an aspect of the present invention, the display system adopts one or more image components of the image signal and/or one or more components obtained via a network, as one or more of the user interface components. According to an aspect of the present invention, the color converter processes one or more of the color areas to change color according to a predetermined setting obtained via a network.  
      To achieve the above and/or other aspects of the present invention, there is a display system to display an image having a color area, the image resulting from an image signal, the display system including a user interface generator which provides one or more user interface components to visually confirm and accommodate a change in a color or colors distributed in the color area in a color space of the image. According to an aspect of the present invention, the user interface generator adopts one of a pre-stored component, an image component of the image signal, and a component obtained via a network as one of the user interface components.  
      To achieve the above and/or other aspects of the present invention, there is a display system to display an image having one or more color areas, the image resulting from an image signal, the display system including a user interface generator which provides one or more reference images requesting a user preferred change in color of the one or more color areas, and presents the one or more reference images to visually indicate the change in color in real time. According to an aspect of the present invention, the user interface generator further provides one or more standard images corresponding to the one or more reference images for a before and after comparison. According to an aspect of the present invention, the user interface generator further provides one or more color control bars corresponding to the one or more color areas to provide a visual representation of the level of the color change.  
      To achieve the above and/or other aspects of the present invention, there is a method of operating a display system to display an image having a color area, the image resulting from an image signal for display, the method including providing one or more user interface components which request a user operation to change a color distributed in a color area in a color space, in response to a user preference key signal, and presenting the one or more user interface components to visually indicate the color change according to the user operation. According to an aspect of the present invention, the method further includes converting the image signal according a conversion setting which corresponds to the user operation. According to an aspect of the present invention, the method further includes displaying the image resulting from the converted image signal.  
      According to an aspect of the present invention, the converting of the image signal includes setting a predetermined color in the color area as a standard color, and determining a conversion degree of the other colors in the color area based on a conversion degree of the standard color.  
      According to an aspect of the present invention, the converting of the image signal comprises changing one or more color components and/or the saturation of the color area, and/or converting a chrominance signal of the image signal to change the color distributed in the color area, without affecting the rest of the image.  
      According to an aspect of the present invention, the method further comprises processing the image signal according to a conversion setting corresponding to, and in response to, the user operation, and processing the image signal according to a predetermined setting in response to a signal indicating a preference for a preset color change in the color area.  
      According to an aspect of the present invention, the providing of the one or more user interface components includes adopting one or more pre-stored components, one or more components of the image signal, and one or more components obtained via a network, or a combination thereof, as the one or more user interface components.  
      According to an aspect of the present invention, the providing of the one or more user interface components includes providing an operable color control bar and a converted image display window having a converted image corresponding to the color area, so as to visually confirm and accommodate the color change, and the presenting of the one or more user interface components includes presenting the color change implemented to the converted image display in real time. According to an aspect of the present invention, the providing of the one or more user interface components further includes providing a standard image display window having a standard image corresponding to the converted image so as to facilitate a before and after comparison.  
      To achieve the above and/or other aspects of the present invention, there is a method of changing a color distributed in a color area of an image, the image resulting from an image signal for display, the method including converting an input coordinate value of an input color, corresponding to a color difference signal, into a converted coordinate value in a coordinate system that is set based on the longest and the shortest axis of a geometric shape defining the color area, in response to the input coordinate value not being identical to a coordinate value of a predetermined standard color, wherein the color difference signal is indicative of the hue and/or saturation of the color, determining a color conversion coefficient for a color conversion of the converted coordinate value and a color conversion coordinate value of the input color in response to the input color not being included in the color area, and converting the color difference signal corresponding to the determined color conversion coordinate value.  
      To achieve the above and/or other aspects of the present invention, there is a method of user interfacing to controllably display an image having one or more color areas, the image resulting from an image signal for display, the method including providing one or more reference images requesting a user predetermined change in color of the one or more color areas, and presenting the one or more reference images to visually indicate the change in color in real time. According to an aspect of the present invention, the method further includes providing one or more standard images corresponding to the one or more reference images for a before and after comparison. According to an aspect of the present invention, the method further includes providing one or more color control bars corresponding to the one or more color areas to provide a visual representation of a level of color change.  
      To achieve the above and/or other aspects of the present invention, there is a method of changing an image having one or more color areas, the image resulting from an image signal for display, the method comprising providing one or more reference images requesting a user preference change in color of the one or more color areas, and converting the image signal to change the color of the one or more color areas within the respective color areas without affecting the rest of the image, according to the user preference change.  
      To achieve the above and/or other aspects of the present invention, there is a computer readable medium encoded with operating instructions for implementing a method of operating a display device to display an image having a color area, the image resulting from an image signal for display, performed by a computer, the method comprising providing one or more user interface components requesting a user operation to change a color distributed in a color area in a color space, in response to a user preference key signal, and presenting the one or more user interface components to visually indicate the color change according to the user operation. According to an aspect of the present invention, the operating instructions further comprise processing the image signal according a conversion setting corresponding to the user operation, the processing of the image signal including setting a predetermined color in the color area as a standard color, and determining a conversion degree of the other colors in the color area based on a conversion degree in the color of the standard color.  
      To achieve the above and/or other aspects of the present invention, there is a method in a computer system to process an image having a color area, the image resulting from an image signal for display, the method comprising controlling a user interface generator to provide one or more user interface components to visually confirm and accommodate a change in color distributed in the color area in a color space and the color is changed within the color area of the image, and controlling a color converter to convert the image signals to change the color in the color area of the image. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the aspects of the present invention, taken in conjunction with the accompanying drawings of which:  
       FIG. 1  is a control block diagram of a display system according to an embodiment of the present invention;  
       FIG. 2  is a drawing illustrating a color space and color areas in an XYZ coordinates system, according to an aspect of the present invention;  
       FIGS. 3 and 4  are XY plane graphs describing a color conversion method according to an aspect of the present invention;  
       FIG. 5  is a flow chart illustrating a color conversion method according to an aspect of the present invention; and  
      FIGS.  6  to  8  are drawings illustrating various user interfacing methods according to several aspects of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.  
       FIG. 1  shows a display system according to an embodiment of the present invention. The display system comprises a display  10  which displays an image, a signal processor  14 , a signal input  13 , a color converter  17 , and a controller  18  which controls the foregoing components. According to an aspect of the present invention, a user interface (UI) generator  19 , a UI data storage, and a user input are also provided as described below.  
      The display  10  displays an image according to an image signal output from the color converter  17 . The display  10  comprises a display module  12  which displays the image, and a module driver  11  which processes the image signal output from the color converter  17  and enables the image to be displayed in the display module  12 . It is understood that the display module  12 , according to an aspect of the present invention, may be one of a variety of display modules known or to be known, for example, a CRT (Cathode Ray Tube), a DLP (Digital Light Processing) display, an LCD (Liquid Crystal Display), a PDP (Plasma Display Panel), and the like. Accordingly, where the display module  12  is a DLP display, the module driver  11  may include an optical engine, and where the display module  12  is an LCD, the module driver  11  may include a printed circuit board that converts an image signal output from the color converter  17  into a data signal or a gate signal. That is, the display  10  may comprise different components, for example, a different module driver  11 , corresponding to the type of the display module  12 .  
      The signal processor  14  converts an image signal output from the signal input  13  into a displayable image signal for the display  10 . The signal processor  14 , according to the present invention, can be variously formed depending on the type of the display module  12 . For example, where the display module  12  is one of an LCD, a PDP, and a DLP display, the signal processor  14  may comprise a scaler  15  that scales a digital image signal, as shown in  FIG. 1 . The signal processor  14  may further comprise a frame buffer  22  which temporarily stores the image signal input through the signal input  13  and outputs it to the scaler  15 . Where the display module  12  is a CRT, the signal processor  14  may comprise an amplifier (not shown) that amplifies the image signal input through the signal input  13 , and horizontal/vertical deflectors (not shown) that deflect an electron beam based on vertical and horizontal synchronizing signals.  
      The signal input  13  receives the image signal, and then outputs it to the signal processor  14 . The signal input  13  is also formed depending on the type of the display module  12 . For example, where the signal processor  14  processes a digital image signal, the signal input  13  may comprise an A/D (Analog to Digital) converter (not shown) and/or other components to assist an LVDS (Low Voltage Differential Signaling) or a TMDS (Transition Minimized Differential Signal) interface to process the digital image signal. Where the display system according to an aspect of the present invention receives a TV signal, a tuner (not shown) is provided in the signal input  13 .  
      The controller  18  controls the signal processor  14 , the color converter  17 , and the signal input  13 . The controller  18  according to an aspect of the present invention controls the color converter  17  to convert the image signal output from the signal processor  14  based on a key signal input through a user input part  21  (to be described later).  
      According to an aspect of the present invention, the color converter  17  converts the image signal output from the signal processor  14  to enable colors which are displayed in the display  10  and distributed in at least one color area (CA 1 , CA 2 , CA 3 ) grouped by a plurality of colors, in a color space (CS) to be converted within the color area (CA 1 , CA 2 , CA 3 ).  
      Here, to logically describe color, the CS refers to all colors represented in a three dimensional coordinates system. The YCbCr color space is an example of a CS. Also, the CIELAB (L*a*b*) or CIELCH (L*c*h*) color space disclosed by Commission International de Eclairage (CIE) may be used as the CS. It is understood that other color spaces may be used without departing from the principles and spirit of the present invention.  
       FIG. 2  depicts a YCbCr color space being used as the CS, and shows the CS formed by a relationship between brightness, hue, and saturation of a color using an XYZ coordinate system. Here, where a color space phase is changed in the XZY coordinates system, the color is also changed, and where a distance between a zero point and a coordinate X, Y, or Z is changed, saturation of the color is changed. Also, where a coordinate Z of the CS is changed centering on a zero point, the brightness of the color is changed. The CS according to an embodiment of the present invention uses six axes formed by six basic colors: R (Red), Y (Yellow), G (Green), C (Cyan), B (Blue), and M (Magenta).  
      A color area is defined by, for example, grouping a plurality of colors distributed in a CS. The three color areas CA 1 , CA 2 , and CA 3  in  FIG. 2  are each defined by grouping a plurality of colors distributed in the CS. The color converter  17  of the present invention recognizes the color areas CA 1 , CA 2 , and CA 3  by calculating them using a geometric equation in the XYZ coordinate system. For example, where the color areas CA 1 , CA 2 , and CA 3  are elliptically shaped in the XYZ coordinate system, the color converter  17  recognizes the color areas CA 1 , CA 2 , and CA 3  by calculating them using an elliptical equation.  
      According to an aspect of the present invention, the color areas CA 1 , CA 2 , and CA 3  may comprise memorial color areas defined according to a distribution of memorial colors. Here, a memorial color area refers to a particular color, or a combination of colors of a certain object/thing that a user is accustomed to and/or perceives as what the color of the object/thing should be in his/her memory. It is understood, for example, that while a skin-tone color, a grass/tree-green color, and a sky-blue color are exemplified, the present invention may be applied with respect to other memorial color areas. Referring to  FIG. 2 , a distribution of a memorial color area is generally an ellipse-like shape in the CS formed by the relationship between brightness, hue, and saturation, and the color areas CA 1 , CA 2 , and CA 3  in  FIG. 2  correspond to the memorial color areas, that is, the skin-tone color, the grass/tree-green color, and the sky-blue color, that are defined based on the distribution of respective memorial colors.  
      According to an aspect of the present invention, a color change is provided within a color area in a color space, and the color area may be of a geometric shape that is not formed of a linear combination of axes of the color space, that is, for example, an area between two lines in a coordinate system of the color space. Accordingly, while not specifically disclaimed, the color change is provided within the color area and the color area need not be moved within the color space to facilitate a color change of an image.  
      Referring to  FIGS. 3 through 5 , a color conversion method according to an aspect of the present invention is described below. As an illustration, the method exemplifies a conversion of hue and saturation in the color converter  17 . Here, the color area (CA 1 , CA 2 , CA 3 ) in the color space (CS) is exemplified in parallel to an X-Y plane. That is, even though a color is converted in the color area (CA 1 , CA 2 , CA 3 ), brightness of the color is not being changed. In this case, the color converter  17  changes hue and saturation of the color in the image signal by converting a color difference signal that represents hue and/or saturation of the color in the image signal output from the signal processor  14 . As shown in  FIGS. 3 and 4 , the color area CA 1  is elliptically shaped. The corresponding elliptical equation and coordinates use X and Y coordinates of the XY coordinate system.  
      The following terminology and parameters are used to describe the color conversion method:  
                                  &lt;Terminology&gt;                     standard color:   a predetermined color to determine a           degree of color change of other           colors in a color area                 &lt;Parameters&gt;                     m1 = cos(−θ), m2 = sin(−θ):   a parameter for a rotation angle of an           ellipse       f, g:   a parameter for an elliptical equation       R(xr, yr):   a coordinate value of the standard color       R′(xr′, yr′):   a color conversion coordinate value of           the standard color                  
 
      Referring to  FIG. 5 , in operation S 10 , parameters (m1, m2, f, g, R(xr, yr), and R′(xr′, yr′)), used for the color conversion by the color converter  17 , are set. That is, the parameters are predetermined/preset in the operation S 10 . Where the image signal from the signal processor  14  is input, the input image signal is divided into a luminance signal and a chrominance signal that define brightness. In operation S 11 , the color converter  17  checks whether a coordinate value (P(x,y)) of a color (hereinafter, “input color”), corresponding to a color difference signal, and a coordinate value (P(xr, yr)) of the standard color are identical. Where the values are identical, the color conversion coordinate value (P(x′,y′)) of the input color becomes the color conversion coordinate value (P(xr′, yr′)) of the standard color, in operation S 17 .  
      Where the coordinate value (P(x,y)) of the input color and the coordinate value (P(xr, yr)) of the standard color are not identical, the coordinate value (P(x,y)) of the input color is converted into a coordinate value (P(x1, y1)) in a coordinate system that is set based on the longest axis and the shortest axis of the ellipse defining the color area CA 1 , in operation S 12 . Here, the conversion of the coordinate value (P(x,y)) of the input color is calculated using Equation 1:  
               [         x1           y1         ]     =       [         m1         -   m2             m2       m1         ]     ⁡     [           x   -   xr               y   -   yr           ]               Equation   ⁢           ⁢   1             
 
      In operation S 13 , a determination is made as to whether the input color is included in the color area CA 1  using Equations 2 and 3 below. The Equation 2 is an ellipse equation to define the color area CA 1  in the new coordinate system set based on the longest axis and the shortest axis of the ellipse forming the color area CA 1  of  FIG. 3 , as shown in  FIG. 4 . Since the coordinate value (P(x,y)) is converted in the operation S 12 , Equations 2 and 3 may be simply calculated based on the coordinate system of  FIG. 4 . 
 
 f×x   2   +g×y   2 =1  Equation 2 
 
 f×x 1 2   +g×y 1 2 ≦1  Equation 3 
 
      Where the input color is not included in the color area CA 1 , the color converter  17  outputs the color difference signal as is, corresponding to the input color, to the display  10 . Where the input color is included in the color area CA 1 , the color converter  17  outputs a color conversion coefficient (a) for the color conversion of the coordinate value (P(x1, y1)) of the input color, in operation S 14 . The color conversion coefficient (a) is calculated using Equations 4 and 5 below:  
             r   =           xc   2     +     yc   2         =         1   +     B   2         f   +     g   ×     B   2                       Equation   ⁢           ⁢   4             
 
       (       B   =     y1   x1       ,         
 
 if x1 is 0, then  
           r   2     =     1   g       ,       
 
 if y1=0, then  
           r   2     =     1   f       ,       
 
 (xc, yc) is a coordinate value of Q)  
             a   =       r   -           (     x   -   xr     )     2       ×       (     y   -   yr     )     2         r             Equation   ⁢           ⁢   5             
 
      In operation S 15 , the color conversion coordinate value (P(x′, y′)) of the input color is calculated using Equation 6 below:  
               [           x   ′               y   ′           ]     =       [         x           y         ]     +     a   ⁡     [             xr   ′     -   xr                 yr   ′     -   yr           ]                 Equation   ⁢           ⁢   6             
 
      Where the color conversion coordinate value (P(x′, y′)) of the input color is calculated, the color converter  17  converts the color difference signal corresponding to the calculated color conversion coordinate value, and outputs it to the display  10 , in operation S 16 .  
      Referring back to  FIG. 1 , the display system according to an aspect of the present invention further comprises the UI (User Interface) generator  19  which provides a user interface through which a user can convert the colors distributed in the color area CA 1 . Here, image signals corresponding to a particular user interface output from the UI generator  19  are input to a mixer  16  of the signal processor  14 . The mixer  16  mixes the image signals input from the signal processor  14  and the UI generator  19 , and outputs it to the color converter  17 .  
      Referring to  FIG. 6 , the user interface according to an aspect of the present invention includes a color controller  30 , which is controlled through a screen, and/or a converted image display window  31 , which displays a converted image  32 . For example, by controlling the color controller  30 , the user may convert the colors distributed in the color area CA 1 . Here, where the color controller  30  is controlled by the user, the color conversion coordinate value (R′(xr′, yr′)) of the aforementioned standard color is changed, and a display condition of the converted image  32  displayed in the converted image display window  31  is changed corresponding to an operation of the color controller  30 . Therefore, the converted image  32  includes corresponding colors distributed in the color area CA 1 .  
      Referring back to  FIG. 1 , the display system according to an aspect of the present invention further comprises the user input  21  which applies a key signal to the controller  18  to convert the colors distributed in the color area CA 1 . The key signal corresponds to, for example, a user interface operation of the color controller  30  to convert the colors distributed in the color area CA 1 . According to an aspect of the present invention, the user input  21  comprises an OSD button provided in a front side of the display system, a keyboard or a mouse of a computer connected to the display system, and/or a remote controller.  
       FIGS. 6 through 8  further illustrate user interfaces according to aspects of the present invention.  
      As shown in  FIG. 6 , the user interface includes the converted image windows  31  corresponding to the color areas CA 1 , CA 2 , and CA 3 , and the converted images  32 , each having colors distributed in a corresponding one of the color areas CA 1 , CA 2 , and C 3 . The converted images  32  are displayed in the respective converted image display windows  31 .  
      The user interface in  FIG. 7  displays a plurality of the color controllers  30 . Correspondingly the converted images having the colors distributed in a plurality of the color areas CA 1  and CA 2 , in one converted image display window is present. Furthermore, it is desirable to include a face of the person distributed corresponding to the color area CA 3 , in the converted images of  FIG. 7 . The converted image display window  31  may include less than all of the converted images  32 , in which case the color controller  30  corresponding to the non-displayed converted image may be inactive or not displayed. According to an aspect of the present invention, the color controllers  30  are displayed outside of the converted image display window  31 . According to an aspect of the present invention, the utilization of the color controllers  30  is optional.  
      The user interface illustrated in  FIG. 8  comprises standard image display windows  33  which display standard images  34  corresponding to, for example, the converted images  32  prior to conversion. Each of the standard images  34  displayed in the respective standard image display windows  33  includes colors distributed in a corresponding one of the color areas CA 1 , CA 2 , and CA 3 , and for a comparison, the colors are not changed by the respective one of the color controllers  30 . For example, a control of a color controller  30  converts colors distributed in a color area (CA 1 , CA 2 , or CA 3 ), thereby changing an image  32  displayed in a respective converted image display window  31  in real time. Here, the state of the corresponding standard image  34  is not changed to facilitate the comparison.  
      According to an aspect of the present invention, data, for example, data related to interfaces of the converted images  32  and the standard images  34 , is stored in the UI data storage  20 , as shown in the display system of  FIG. 1 . While not limited thereto, a flash memory may be used for the UI data storage  20 . The UI data storage  20  outputs the data of the interfaces such as the converted image  32  and the standard image  34  to the frame buffer  22  of the signal processor  14  as controlled by the controller  18 .  
      While the color areas CA 1 , CA 2 , and CA 3  are described as an elliptical shape in the foregoing aspects, it is understood that they may be of various geometric shapes including complex geometric shapes. It is also understood that while color areas CA 1 , CA 2 , and CA 3  have been described with respect to skin-tone color, grass/tree-green color, and sky-blue color, other color areas corresponding to other colors may be provided. For example, other color areas may be provided for other skin-tone colors.  
      Furthermore, while the controller  18  has been described as outputting the interface data of the standard images  34  stored in advance in the UI data storage  20 , to facilitate the user interface, the controller  18  may adopt data from any image in the image signal input to the frame buffer  22  from the signal input  13  as a standard image for the user interface. Also, the controller  18  may adopt data of any image in the image signal as data of a standard image to store it in the UI data storage  20 , and display it to the corresponding standard image display window  33 . The controller  18  may likewise adopt data of an image obtained through a network, such as the Internet, for the user interface. The same may apply with respect to the standard images  34  for the user interface.  
      In addition, while a user interface has been described with respect to color change in a color area in a color space, it is understood that the user interface aspect of the present invention can be applied to facilitate a color change with respect to a display system capable of color change using known or to be known color changing apparatuses and/or methods.  
      As described the above, the display system according to the present invention allows a conversion in color of an image, the color being distributed only in a certain color area in a color space, and applies the change to an image or an image stream for display. The settings corresponding to a user desired conversion may be stored for later applications.  
      Because conversion in color for the colors distributed in the color area occurs within the color area, the display system of the present invention prevents discontinuity of the colors caused by conversion in color. That is, the display system minimizes the number of colors not displayed therein. Also, since colors distributed only in a predetermined color area are changed, other colors and/or color areas are not affected.  
      According to an aspect of the present invention, using an XYZ coordinate system for the color conversion, the color areas are formed in various geometric shapes, and calculations for the conversion are performed with ease, while not specifically disclaimed, without, for example, using a look up table. It is understood that the present invention is not limited to the six basic colors, and as described above, not limited to a color area comprising a linear combination thereof, that is, the color areas may be formed of complex geometric shapes. In other words, while not specifically disclaimed, a color area of the present invention need not be within a linear combination of colors with respect to axes of a color space.  
      It is understood that a system which uses the present invention may also include permanent or removable storage, such as magnetic and optical discs, RAM, ROM, etc., on which the process and data structures of the present invention can be stored and distributed. The operations can also be distributed, for example, via downloading over a network such as the Internet.  
      Although a few embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.