JP4556523B2 - Video signal processing apparatus and video signal processing method - Google Patents

Description

  The present invention relates to a video signal processing apparatus and method for executing a required process on a video signal, and in particular, a so-called superimposing display of character images such as characters and figures with a normal display image as a background image. The present invention relates to a video signal processing apparatus and method for an on-screen display.

  For example, a video apparatus such as a current television receiver is usually provided with a so-called on-screen display (OSD) function. As is well known, OSD displays an original display image as a background image so that an on-screen display image, which is an image of characters, symbols, graphics, etc., is superimposed on a predetermined position of the background image. Is done. As a typical example, depending on the on-screen display function, there are an input source corresponding to an image currently displayed and output, a channel number of a broadcasting station, a setting operation screen for a user to perform a predetermined setting operation, and the like. Is displayed.

JP 2003-338991 A

By the way, the on-screen display image is generally displayed in a predetermined fixed color. For this reason, depending on the content of the original display image that is the background image, it may be difficult to see the on-screen display image. For example, if the on-screen display image has a color tone based on green, and the background image tends to be green, the on-screen display image is easily assimilated into the background image. It becomes difficult to visually recognize screen display images clearly.
For this reason, at present, it is required to make it easy to visually recognize the on-screen display image regardless of the content (color) of the background image that changes over time. I can say. Further, in this case, if the on-screen display image is generated so that the display image is most easily seen by the user according to individual differences of the user, the on-screen display function is further enhanced. Would be preferable.

In view of the above-described problems, the present invention is configured as a video signal processing apparatus as follows.
That is, a color determination unit that takes a video signal to be displayed and output as a background image for an on-screen display image, determines a reference image color that is regarded as a color of the image displayed by the video signal, and a color of the background image A selection method based on the relationship between the display screen and an operation means capable of specifying the color tendency of the on-screen display image including the selection range, and the color tendency of the on-screen display image specified by the operation on the operation means. Based on the information holding means for holding the designation information to be designated, the reference image color determined by the color determination means and the designation information held by the information holding means, the color of the on-screen display image is other than the reference image color A color determining means for determining a specific color of the image, and an on-screen by the color determined by the color determining means. As the display image is displayed superimposed on the background image, it was decided and a signal processing means for executing processing for video signals to be displayed and output as a background image.

Further, as a signal processing method, a color determination procedure for capturing a video signal to be displayed and output as a background image with respect to an on-screen display image and determining a reference image color regarded as a color of an image displayed by the video signal; An operation input procedure that enables an operation to specify a color method of an on-screen display image including a selection method and a selection range based on the relationship with the color of the background image, and an on-screen display obtained by the operation input procedure A reference as the color of the on-screen display image based on the information holding procedure that holds the designation information that specifies the color tendency of the image, the reference image color determined by the color determination procedure, and the designation information that is held by the information holding procedure The color determination procedure for determining a specific color other than the image color and the color determined by this color determination procedure On-screen display image was be configured to perform a signal processing procedure for executing the processing for the video signal to be displayed and output as a background image to be displayed superimposed on the background image.

In each of the above configurations, first, it is possible to designate the tendency of the color of the on-screen display image with respect to the color of the background image by a user operation. Then, in displaying the on-screen display image with respect to the background image, based on the color designation information indicating the color tendency designated by the user operation described above and the reference image color determined as the background image color, The color of the on-screen display image is determined.
Since the color of the on-screen display image determined in this way is first a color other than the reference image color, it is a color different from the color of the background image when actually displayed as an image. The state is always obtained. Further, since the determined color of the on-screen display image is specified according to the color tendency indicated by the color designation information on the basis of the reference image color which is the background image color at that time, the color tendency specified by the user It will match. Then, the on-screen display image is displayed so as to be superimposed on the background image by the color thus determined.

  Thus, according to the present invention, a color different from the background image is set for the change in the content (color) of the background image for the on-screen display image. A state that is easy to recognize is secured. In addition, the color of the on-screen display image is determined according to the color tendency designated by the user himself / herself. In other words, according to the present invention, the colors of the on-screen display image are always visually distinguishable regardless of changes in the background image, and adapted to individual differences such as the user's preference for color and ease of viewing the color, for example. It is possible to make it. This will provide a much richer on-screen display capability than ever before.

Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described. In this embodiment, the video signal processing apparatus according to the present invention is applied to a television receiver as an example.
The television receiver of this embodiment has a so-called on-screen display function. In other words, for example, a video signal image obtained by receiving and selecting a channel is used as a background image (main image), and if necessary, characters, pictures, graphics, such as channel numbers, volume levels, and setting images for various settings. For example, a partial image is displayed so as to be superimposed on the background image.

As the on-screen display function of the present embodiment, basically, the color tone of the background image changes as the content of the background image (main image) changes and the color tone changes. Different on-screen display image colors can be set. As a result, the on-screen display image is not assimilated with the background image regardless of changes in the background image, and is easy to see.
However, if the algorithm for setting the color of the on-screen display image with respect to the color tone of the background image is determined according to a predetermined rule, the on-screen display image can be clearly seen and recognized with respect to the background image. Depending on the user, the color tendency of the on-screen display image may not be his or her preference. Also, for example, in the color relationship between the background image displayed according to the setting algorithm and the on-screen display image, depending on the user, it may be too difficult to see, or conversely, it may be more prominent. In this way, there may be individual differences in impressions.
Therefore, in this embodiment, the color of the on-screen display image different from the color tone of the background image can be set after adapting to the user's preference as described above, individual differences in the impression of color, and the like. Configured as follows.

  Then, in setting the color of the on-screen display image, in order to reflect the user's preference and the like as described above, the television receiver according to the present embodiment relates to the color of the on-screen display image. It can be set by user operation. For this reason, the television receiver according to the present embodiment can display the on-screen display color setting screen shown in FIG. This setting screen can be called on the display screen when the user performs a predetermined operation on the television receiver, for example. Also, the setting screen itself is an on-screen display image superimposed on the background image (main image) by the on-screen display function of the television receiver.

  In the on-screen display color setting screen of FIG. 5, first, five items of “basic fixed color”, “complementary color”, “similar color”, “same color”, and “user setting” are shown as “selection method” items. In this case, these items are selected by enabling / disabling radio buttons. The figure shows a case where the item “complementary color” is selected.

  When “basic fixed color” is selected, a predetermined basic color is fixedly set as the color of the on-screen display image.

When “complementary color” is selected, an algorithm for selecting and setting a color having a complementary color relationship with the color of the background image for the on-screen display image is executed.
This will be described with reference to FIG.
In the present embodiment, as shown in FIG. 6, as colors that can be set in the on-screen display image, yellow, yellow green, green, blue green, green blue, blue, blue purple, Twelve colors of purple, magenta, red, red-orange and yellow-orange are available. Accordingly, in determining the color of the background image, the determination result is output using any one of the 12 colors based on the hue circle. As will be described later, as colors that can be set for the on-screen display image, two colors of “white” and “black” expressed by brightness other than the hue ring are prepared. In most cases, the background screen has some color, so basically one of the 12 colors in the hue circle is output as the determination result for the background image color. The

Here, when the user selects “complementary color” as the “selection method”, it is determined that the color of the background image (reference image color) is blue as shown in FIG. In the hue circle, the positions are opposed to each other at 180 °, and the color farthest in distance is complementary. Therefore, when the color of the background image is blue, yellow-orange having a complementary color relationship with blue is determined as the color of the on-screen display image as illustrated.
When this “complementary color” item is selected, the color of the on-screen display image is most distinguishable from the background color.

Further, when the item “similar color” is selected from the “selection method” on the on-screen display color setting screen in FIG. 5, the color of the on-screen display image is determined as shown in FIG. 7.
In the hue circle, the closer the distance between each other, the more similar the colors are. However, here, as the similar colors in the on-screen display image setting, The color is the closest distance.
In this case as well, if it is determined that the background image color is blue, the similar color is either green blue or bluish purple. That is, in the case of similar colors, two color candidates are generated according to the clockwise and counterclockwise directions of the hue circle. One of these is selected and determined as the color of the on-screen display image. It should be noted that which of the two candidate colors is to be selected may follow a preset rule. For example, an algorithm is included so as to select a color having a closer distribution (balance) of R, G, and B values of the color determined as the background image color (that is, a color that is considered to be closer to the color). It is possible. It is also conceivable that selection can be determined according to a user operation.
The on-screen display image based on the “similar color” has a weaker degree with respect to the background image color than when the “complementary color” item is selected, for example. However, for example, depending on the user, the on-screen display image may be too conspicuous and difficult to see with complementary colors. In such a case, the “similar color” is an option for the user.

In addition, when the “same color” item is selected from the “selection method” on the on-screen display color setting screen in FIG. 5, the same color as the determination color of the background image is set to the color of the on-screen display image in the hue circle. As will be selected and determined.
When this “same color” item is selected, the degree of the background image color is weaker than when the “similar color” is selected. However, as will be described later, since the background image color determination result is, for example, an average color for the background image (main image), the background image determination color is used as the color of the on-screen display image. Even if the same color is set, the on-screen display image is not completely assimilated with the background image and cannot be visually recognized. Therefore, this “same color” is also an option when it is desired to prevent the on-screen display image from becoming too conspicuous, similarly to the “similar color”.

  Further, when the item “user setting” is selected from the “selection method” on the on-screen display color setting screen in FIG. 5, for example, colors that can be set to the on-screen display image (in this embodiment, the hue ring) A selection screen for selecting and determining one color from the two colors of white, black and white, and a total of 14 colors) is displayed. When the color is determined by an operation on the selection screen, the on-screen display image is fixed by the determined color regardless of the background image color.

  Further, the basic color selection algorithm when “complementary color” or “similar color” is selected as the “selection method” is the same as that described above with reference to FIGS. When “complementary color” or “similar color” is selected, the item “selection range” in FIG. 5 can be selected. As a result, the “complementary color” or “similar color” can be selected for the on-screen display image. In addition, it is possible to set a range for candidate colors according to the item selected in the “selection range”. Here, each item of “selection range” can also be selected by operating a radio button.

  First, when “complementary color” or “similar color” is selected as the “selection method” and “all colors” is selected as the “selection range”, all of the 12 color hue rings described above are selected. The color is a candidate for the color of the on-screen display image. The selection algorithm in this case is the same as described with reference to FIGS. In other words, the color selection determination of the on-screen display image as “complementary color” or “similar color” described with reference to FIGS. 6 and 7 is performed when “all colors” is set for “selection range”. Will be.

Further, when “cold color” is selected as the “selection range”, the color of the on-screen display image is determined as shown in FIG. 8, for example.
When “cold color” is selected as the “selection range”, as shown in FIG. 8, the 12 colors forming the hue circle are classified into two color ranges, warm color and cold color. Here, six colors of yellow, yellow-orange, red-orange, red, red-purple, and purple are classified as being in the warm color range, and six colors of yellow-green, green, blue-green, patina, blue, and blue-violet are cold-colored. Classified as in range.
In addition, in the example of FIG. 8, “complementary color” is selected as the “selection method”, and the determination color of the background image is blue.
In this case, first of all, the yellow complementary color in the 12-color hue circle is the blue complementary color. However, yellow-orange is a color in the warm color range. Therefore, in this case, yellowish green that is the closest color to this yellow-orange and is included in the cold color range is selected and determined as the color of the on-screen display image.

When “warm color” is selected as the “selection range”, the “cold color” color selection algorithm described with reference to FIG. 8 is changed to select the “warm color” color range, and the on-screen display is selected. The color of the image is determined.
For example, as shown in FIG. 8, “complementary color” is selected as the “selection method”, the determination color of the background image is blue, and “warm color” is selected as the “selection range”. In this case, yellow-orange, which is a complementary color of blue in the hue circle, is in the warm color range. Therefore, in this case, yellow-orange is selected and determined as it is as the color of the on-screen display image.
Further, when “similar color” is selected as the “selection method” and “warm color” or “cold color” is selected as the “selection range”, the rules for selecting similar colors described above with reference to FIG. The color selection rule based on the warm and cold color ranges shown in FIG. 8 may be combined.

When “primary colors only” is selected as the “selection range”, as shown in FIG. 9, for example, only three primary colors of blue, red, and green light are displayed on the screen in a 12-color hue circle. Candidate for image color.
As a specific example, assuming that “primary color only” is selected as the “selection range”, “complementary color” is selected as the “selection method”, and it is determined that the background image color is blue. The complementary color will be yellow-orange. In the 12-color hue circle, the three primary colors closest to yellow-orange are red among blue, red, and green. Therefore, in this case, red is selected and determined as the color of the on-screen display image.

When “monotone” is selected as the “selection range”, as shown in FIG. 10, white or black is not a color within the 12-color hue circle but a candidate for color selection.
For example, when determining the color of the background image, the brightness is also determined. Then, based on the brightness determination result, it is determined whether the background image is included in the white range or the black range. When the determination result that the background image is included in the white range is obtained, the opposite black is set for the on-screen display image. Similarly, when a determination result that the background image is included in the black range is obtained, white is set for the on-screen display image.

  In the screen shown in FIG. 5, the item “user setting” can be selected in the “selection range”. When you select this “User Settings” item, you can specify a selection range other than the above “All Colors”, “Cool Colors”, “Warm Colors”, “Primary Colors Only”, and “Monotone” items, and detailed settings for these items. The setting screen for this is displayed.

In this manner, in the present embodiment, the color of the on-screen display image can be set according to the user operation.
In particular, when “complementary color” or “similar color” is selected as the “selection method”, the color of the on-screen display image different from the background image is determined according to the tendency of the color designated as “complementary color” or “similar color”. It is to be selected. In other words, for the color of the on-screen display image, a color that is easy to visually recognize without being assimilated with the background image is selected, and the user can specify the tendency of the selected color. Therefore, it is possible to deal with individual differences in color-related sensations such as user preference and visibility. Further, in the present embodiment, as described above, when “complementary color” or “similar color” is selected as the “selection method”, the condition of the color tendency bundled by the type of “complementary color” or “similar color” is satisfied. Thus, it is possible to set a more detailed (limited) color tendency by selecting an item of “selection range”.
In this way, the present embodiment not only sets the color of the on-screen display image that is easily visually recognized with respect to the background image, but also the color of the on-screen display image matches the user's intention. Considered to be. As a result, the on-screen display image display can be improved in quality than before. In addition, since the color tendency of the on-screen display image changes according to the user's setting operation, it also has the property of giving the user enjoyment.

Here, FIG. 11 shows a state example of the display screen on which the on-screen display color setting screen is displayed.
As shown in this figure, the main image as the background image is displayed on the entire display screen 100 of the television receiver. An on-screen display color setting screen is superimposed and displayed as an on-screen display image on the upper center side of the background image (main image).
When the user sets the “selection method” and “selection range” as described above with the on-screen display color setting screen displayed in this way, the setting is an on-screen display image that is an on-screen display image. It is also reflected on the color setting screen. Thereby, the user can check the color set on the on-screen display color setting screen (on-screen display image) while performing an operation on the on-screen display color setting screen.

  Next, a technical configuration example for realizing the operation of selecting and determining the color of the on-screen display image according to the present embodiment described above with reference to FIGS. 5 to 10 will be described with reference to FIGS. I will explain.

First, FIG. 1 shows a configuration example of a television receiver which is a video signal processing apparatus as an embodiment of the present invention.
In the television receiver shown in this figure, a reception signal obtained by receiving a predetermined broadcast wave by the antenna 1 is supplied to the tuner unit 2. Here, as an example, for example, a broadcast wave by radio waves is received, but this broadcast wave may be any of terrestrial broadcast and satellite broadcast. Further, it may be configured to receive a cable transmitted by CATV (Cable Television) or the like.

The tuner unit 2 tunes the input received signal and performs necessary signal processing such as decoding processing for predetermined encoding as necessary, for example, a video signal of a required channel. To be output. Here, the video signal output from the tuner unit 2 is an RGB signal based on the three primary colors of light.
The video signal output from the tuner unit 2 is branched and input to the synthesis processing unit 3 and the hue analysis processing unit 5.

The synthesis processing unit 3 receives the video signal output from the tuner unit 2 and corresponds to the on-screen display image portion generated by the OSD processing unit 7 when displaying the on-screen display image. An on-screen image signal as a signal is input. The composition processing unit 3 uses the video signal output from the tuner unit 2 (hereinafter also referred to as a main image video signal) as a background image, and the image displayed by the on-screen display image signal as described above. To generate a video signal (synthesized video signal) obtained by synthesizing the main image video signal and the on-screen image signal in order to obtain an on-screen display image displayed so as to be superimposed on a required position on the background image. Signal processing is executed, and this synthesized video signal is output to the display unit 4.
In addition, what is necessary is just to employ | adopt the technique known until now as signal processing for obtaining such a synthetic | combination video signal. Further, this processing may be digital signal processing or analog signal processing.
For confirmation, when it is not necessary to display an image on the on-screen display, the synthesizing processing unit 3 does not perform the synthesizing process and the main image video signal input from the tuner unit is not executed. The data is output to the display unit 4 as it is.

  The display unit 4 includes a predetermined type of display device and a drive circuit unit that drives the display device based on a video signal input so that an image is displayed and output on a display screen of the display device. In the present embodiment, the display device employed in the display unit 4 is not particularly limited. However, in the present situation, for example, an LCD, a CRT, a plasma display panel, and the like can be given.

  The hue analysis processing unit 5 takes in the main image video signal output from the tuner unit 2, and displays the color (background image) of the main image when the main image video signal is displayed and output as an image according to the procedure described later. Analysis processing for determining what kind of color (reference image color) is executed. As described above, the determination result of the background image color corresponds to the closest color among any of the twelve colors forming the hue circle shown in FIG. Information on the background image color determined by the analysis processing of the hue analysis processing unit 5 is input to the color determination processing unit 6.

The color determination processing unit 6 executes a process for determining the color of the on-screen display image based on the background image color information determined by the hue analysis processing unit 5 and the color designation information.
Here, the color designation information is information generated as having the contents in accordance with the contents set by the user by operating the on-screen display color setting screen shown in FIG. For example, if the user sets “similar color” as the “selection method” and “warm color” as the “selection range”, the color designation information has contents indicating this. . Although this color designation information is not shown here, it is actually stored in a storage means composed of a nonvolatile memory element or the like that is assumed to be provided in the television receiver of the present embodiment. It has come to be remembered. In addition, in the television receiver of this embodiment, control such as generation of color designation information corresponding to the operation result on the on-screen display color setting screen and writing / reading of color designation information to / from the storage means are performed in various control processes. A microcomputer that executes is executed.
Then, when the color determination processing unit 6 determines a color, a process according to an algorithm configured to execute the color selection procedure exemplified above with reference to FIGS. 6 to 10 is executed. The Accordingly, the colors of the on-screen display image determined by the color determination processing unit 6 are selected as candidates from a total of 14 colors of 12 colors forming the hue circle defined in the present embodiment and white and black. It becomes.
When the color of the on-screen display image is determined in this way, the color determination processing unit 6 notifies the OSD processing unit 7 of the determined color information (determined color information).

  The OSD processing unit 7 generates characters (including symbols, etc.), image data of a predetermined shape pattern corresponding to required display contents, which are materials of an on-screen display image called a character generator, Based on the generated image data, an on-screen image signal that is an image signal to be superimposed on the background image is generated.

Further, the on-screen display function of this embodiment includes a color palette. The color pallet here is information indicating colors that can be used as image colors when the OSD processing unit 7 generates image data for on-screen display. Is data having a table structure as shown in FIG.
As shown in FIG. 2, as the color palette, first, a color number is defined as an identifier for each color prepared in this color palette. In the present embodiment, the colors prepared as the color palette are a total of 14 colors including 12 colors forming the hue circle described above with reference to FIGS. 5 to 10 and two colors of white and black. As a result, the colors of the on-screen display image have variations based on these 14 colors. In addition, although it is only an example, here, the color number is a value in the range of 1 to 14 by a natural number, and for these color numbers 1 to 14, respectively yellow, yellow green, green, blue Green, patina, blue, blue-violet, purple, magenta, red, red-orange, yellow-orange, white, and black are to be supported.
For each of these color numbers, R, G, and B values that are color component values for expressing the color corresponding to the color number are associated with each other. In FIG. 2, the R, G, and B value columns are shown as blank, but in reality, information on predetermined actual values is stored in each of these columns.
The data as the color pallet is stored in advance in, for example, a ROM or a non-volatile memory element that is assumed to be actually provided in the television receiver.

When the OSD processing unit 7 generates the on-screen display image signal, the color component value (R) corresponding to the color (color number) indicated by the determined color information notified from the color determination processing unit 6 is referred to the color palette. , G, B values). Then, after generating image data for on-screen display using the read color component values (R, G, B values), an on-screen display image signal is generated and output.
With such an operation, the television receiver according to the present embodiment performs the color setting for the on-screen display image as described with reference to FIGS.

  Further, the operation input unit 8 shown in FIG. 1 calls at least a user operation for obtaining the color designation information described above, that is, the on-screen display color setting screen shown in FIG. In addition, it is composed of predetermined operation means for enabling an operation on the called on-screen display color setting screen. For example, a predetermined operator provided in a television receiver, a predetermined operator provided in a remote controller attached to the television receiver, and an operation information signal transmitted from the remote controller are transmitted on the television receiver side. It comprises a receiving unit for receiving a command signal.

  Note that the configuration of the television receiver according to the present embodiment shown in FIG. 1 indicates functional parts related to color selection of an on-screen display image as the present embodiment. For this reason, the block configuration shown in FIG. 1 includes a portion showing a software configuration as a functional block in addition to an actual hardware configuration. As described above, the television receiver according to the present embodiment includes a microcomputer including a CPU, a ROM, a RAM, and the like, and various control processes are executed by the microcomputer. In the configuration shown in FIG. 1, for example, the operations of the hue analysis processing unit 5 and the color determination processing unit 6 are performed after the microcomputer captures the video signal of the background image (main image) and holds it in the RAM. For example, it can be obtained as a process executed by the CPU according to a program stored in the ROM. As for the operation as the OSD processing unit 7 or the like, the process of setting the R, G, and B values read from the color palette in response to the notification of the color determination information can be configured as a control process executed by the microcomputer. .

  Next, with respect to the configuration for realizing the on-screen display with the color according to the color designation information described with reference to FIG. 1 above, the microcomputer (CPU) included in the television receiver should be executed according to the program. This will be described with reference to the flowcharts of FIGS.

  Assuming that it is time to execute some on-screen display as the operation of the television receiver, the microcomputer of the television receiver outputs from the tuner unit 2 which is the processing as step S101 in FIG. A process for hue analysis of a video signal as a background image (main image) is executed. This processing corresponds to the function as the hue analysis processing unit 5 in FIG.

The hue analysis process as step S101 is, for example, as shown in FIG.
In FIG. 4, first, in step S201, the video signal of the background image output from the tuner unit 2 is captured in units of frame images (or in units of field images), and for example, as one frame image data, Stored in the RAM.
In the next step S202, when the frame image data held in the RAM as described above is viewed as a two-dimensional image for one screen, for example, the region is divided by a predetermined division pattern. As a division pattern at this time, for example, an appropriate measurement result may be obtained by equally dividing one screen by a predetermined number so that the two-dimensional shape size of each divided region obtained by division is the same. It is preferable in obtaining. In subsequent step S203, a pixel at a predetermined position for each divided region obtained in step S20 is extracted, and each of R, G, and B values that are color component values for the extracted pixel is measured.

At the stage where the processing of step S203 is completed, the color component values (R, G, B values) for each divided region are obtained. Therefore, in the subsequent step S204, an average value for each of the R value, the G value, and the B value forming the color component value is obtained by using the color component value for each of these divided regions. That is, an average value Ra of R values is calculated from a plurality of R values obtained for each divided region, and similarly, an average value Ga of G values is calculated from a plurality of G values obtained for each divided region. And an average value Ba of B values is calculated from a plurality of B values obtained for each divided region.
When the average values Ra, Ga, and Ba thus obtained are viewed as one color component value (Ra, Ga, Ba), the color component values (Ra, Ga, Ba) are converted into frame images in step S201. It can be said that the average hue of the background image captured by the unit is expressed.

In the next step S205, the color component values (Ra, Ga, Ba) obtained by the average values Ra, Ga, Ba obtained in the above step S204 among the color numbers indicated in the color palette are assumed to be the shortest distance. A color number having a color component value is specified. This process is a process of specifying a color that is the closest to the color as the screen average of the background image captured in step S201 from the colors prepared in the color palette.
However, in the present embodiment, the color of the on-screen display image is determined corresponding to the background image, first, as described with reference to FIG. This complementary color or similar color is selected using the hue circle of 12 colors shown in FIG. Corresponding to this, the color numbers that are selection candidates in step S205 correspond to 12 colors that form a hue circle from among the color numbers 1 to 14. That is, among the color numbers 1 to 14, the color numbers 1 to 12 are obtained by excluding the color numbers 13 and 14 corresponding to white and black that are not expressed depending on the hue (not included in the hue ring).

で表される演算を、色番号１〜１２ごとに行うようにされる。そして、この（数１）による演算により得られた値が最小（min）となる色成分値（Ｒ，Ｇ，Ｂ）を持つ色番号を、ステップＳ２０５における特定結果として出力するようにされる。
このようにして、図３のステップＳ１０１（図４のステップＳ２０１〜Ｓ２０５）の処理が実行されることによっては、色相解析結果として、実施の形態の１２色の色相環のうちから、背景画像の画面平均色に一致するとされる色相が、カラーパレットの色番号により特定されることになる。そして、ステップＳ１０１の処理を終了すると、図３のステップＳ１０２の処理に進むことになる。 In step S205, in order to specify the color number having the color component value with the shortest distance with respect to the color component values (Ra, Ga, Ba), as an example, the color number i (1 ≦ i) in the color palette is used. ≦ 12) R, G, B values as Rpi, Gpi, Bpi respectively

Is performed for each of the color numbers 1-12. Then, the color number having the color component value (R, G, B) at which the value obtained by the calculation according to (Equation 1) is the minimum (min) is output as the specific result in step S205.
In this way, by executing the processing of step S101 in FIG. 3 (steps S201 to S205 in FIG. 4), the hue analysis result is obtained from the 12 color hue circles of the embodiment as the background image. The hue that matches the screen average color is specified by the color number of the color palette. Then, when the process of step S101 ends, the process proceeds to step S102 of FIG.

In step S102, for example, the color designation information currently stored and held in the nonvolatile memory is read out and held in the RAM, for example.
For confirmation, the color designation information indicates the setting contents for the on-screen display image color obtained by the user's operation on the on-screen display color setting screen shown in FIG. Is.

In the next step S103, the hue analysis result in step S101, that is, the information on the color number of the color pallet corresponding to the hue that matches the screen average color of the background image, and the color designation information fetched in step S102 above. To determine the color to be used for the on-screen display image. In determining the color to be used for the on-screen display image, all 14 colors prepared in the color palette are candidates.
As the processing of step S103, first, in the content of the color designation information, when the “selection method” is either “complementary color” or “similar color”, basically (the selection range is “all colors”). 6), as described with reference to FIGS. 6 and 7, a color that is complementary or similar to the hue (color number of the color palette) specified as the hue analysis result in step S101 is selected. To be. In addition, depending on the designated content of the “selection range”, the color corresponding to the designated information content is finally determined as described with reference to FIGS. Thus, the information of the determined color obtained as the process of step S103 is indicated by the color number of the color palette, for example.
In addition, when the color selection information is set to “basic fixed color” or “user setting” as the content of the color selection information and a specific color is specified, the color corresponding to the specified color The color number of the palette is output as it is as the processing result of step S103.
The processing in step S103 corresponds to the function as the color determination processing unit 6 in FIG. That is, the processing result of step S103 becomes the determined color information described with reference to FIG.

In the next step S104 and the subsequent step S105, in correspondence with FIG. 1, the OSD processor 7 functions as a function of the microcomputer to receive the notification of the decision color information and generate an on-screen image signal. This is the control process.
In step S104, by referring to the color palette, the color component values (R, G, B values) corresponding to the color numbers indicated by the determined color information are read out and acquired. In step S105, the color component values (R, G, B values) acquired in step S104 are set as the R, G, B values used by the OSD processing unit 7 for the on-screen display image data. Then, control processing is executed so that on-screen display image data having the required image content is generated. Then, an on-screen image signal, which is an image signal corresponding to the on-screen display image data generated in this way, is output to the synthesis processing unit 3 shown in FIG. As a result, as described above with reference to FIG. 1, the on-screen display image is superimposed and displayed in the color selected in accordance with the setting operation on the on-screen display color setting screen shown in FIG.

  Further, in the present embodiment, the processing shown in FIG. 3 is repeatedly executed, for example, at a fixed cycle timing from when on-screen display is started until the predetermined condition is satisfied and ended. As a result, for example, when “complementary color” or “similar color” is selected as the setting method of the on-screen display color, the content of the background image (main image) changes, Even if the color tendency of the entire screen changes, the color of the on-screen display image is dynamically changed according to this, and an on-screen display as intended by the user is always obtained. Further, since the on-screen display color setting screen shown in FIG. 5 is also one of the on-screen display images, when an operation is performed on this on-screen display color setting screen, according to the setting contents changed according to the operation. Therefore, the color of the on-screen display color setting screen itself changes. For example, the user looks at such a change in the color of the on-screen display color setting screen and determines whether the setting result is appropriate.

The present invention should not be limited to the embodiments described so far.
For example, in the embodiment, an example in which the on-screen display based on the present invention is applied to a television receiver is given. However, the present invention is not limited to this, and for example, a video recorder, a single digital broadcast tuner, or the like. It can be applied to various video devices that perform on-screen display using a main image as a background image.
In the embodiment, 14 colors of 12 color circles and 2 colors of white and black are used for color selection. However, this is just an example, and it is the number of colors to be selected. Further, what color is selected as a selection candidate may be appropriately changed.
Further, the processing for determining the color of the background image (main image) is not limited to the procedure of the hue analysis of the video signal in the embodiment. For example, in the embodiment, the color determination is performed on the entire frame image area of the background image. On the other hand, the frame image area of the background image is adapted to the display position of the on-screen display image. Only a required partial area may be used for color determination. In this way, for example, the amount of image data to be processed required for analyzing colors is reduced, so that it can be expected that the processing for color analysis will be light.
In addition, the calculation for obtaining the analysis result is not limited to that shown in (Equation 1), and other calculation formulas may be adopted as long as an analysis result having a reasonably high reliability can be obtained. It doesn't matter.
In addition, the color determination (color analysis) of the background image (main image) includes the average values (Ra, Ga, Ba) for the R, G, and B values and the R, G, and R for each color prepared in the color palette. For example, the ratio between the R, G, and B values of the background image (main image) is obtained, and the R, for each color prepared in the color palette is determined based on the ratio value. A method of color determination other than based on the average value, such as comparison with G and B values, can be considered.

It is a block diagram which shows the structural example of the television receiver provided with the video signal processing function as embodiment of this invention. It is a figure which shows the data structure of the color palette with which a television receiver is provided corresponding to the on-screen display function of embodiment. It is a flowchart which shows the processing operation for implement | achieving the on-screen display function of this Embodiment. It is a flowchart which shows the hue analysis process of the video signal in FIG. It is a figure which shows the example of the content of an on-screen display color setting screen. It is a figure which shows the example of a setting (correction method: complementary color) of an on-screen image color. It is a figure which shows the example of a setting (correction method: similar color) of an on-screen image color. It is a figure which shows the example of a setting (correction method: complementary color correction range: cold color) of an on-screen image color. It is a figure which shows the example of a setting (correction range: three primary colors) of an on-screen image color. It is a figure which shows the example of a setting of an on-screen image color (correction range: monotone). It is a figure which shows the example of a display of the on-screen display color setting screen on a display screen.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Antenna 2 Tuner part 3 Composition processing part 4 Display part 5 Hue analysis processing part 6 Color determination processing part 7 OSD processing part 8 Operation input part 100 Display screen

Claims (2)

Color determination means for capturing a video signal to be displayed and output as a background image with respect to the on-screen display image, and determining a reference image color regarded as a color of the image displayed by the video signal;
A selection method based on the relationship with the color of the background image and an operation means capable of specifying a color tendency of an on-screen display image including a selection range ;
Information holding means for holding designation information for designating a color tendency of an on-screen display image designated by an operation on the operation means;
Based on the reference image color determined by the color determination means and the designation information held by the information holding means, a specific color other than the reference image color is determined as the color of the on-screen display image. Color determining means;
Signal processing means for executing processing on the video signal to be displayed and output as the background image so that the on-screen display image with the color determined by the color determination means is displayed superimposed on the background image;
Ru a video signal processing apparatus. A color determination procedure for capturing a video signal to be displayed and output as a background image with respect to an on-screen display image, and determining a reference image color regarded as a color of the image displayed by the video signal;
A selection method based on the relationship with the color of the background image and an operation input procedure that enables an operation to specify a color tendency of an on-screen display image including a selection range ;
An information holding procedure for holding designation information for designating the color tendency of the on-screen display image obtained by the operation input procedure;
Based on the reference image color determined by the color determination procedure and the designation information held by the information holding procedure, a specific color other than the reference image color is determined as the color of the on-screen display image. Color determination procedure;
A signal processing procedure for performing processing on the video signal to be displayed and output as the background image so that the on-screen display image with the color determined by the color determination procedure is displayed superimposed on the background image;
A video signal processing method that perform.

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