KR20050055911A - Apparatus and method to switch between osd layers - Google Patents

Abstract

The present invention is to provide a device and method for selectively determining a layer to be placed on a pixel-by-pixel with a layer (switching plane) that determines the top and bottom between the two layers, a plurality of through the receiver An OSD unit that performs a scaler by receiving a caption signal and / or an image signal, and a switching plane that outputs a control signal for setting an upper layer and a lower layer for each pixel to be displayed in the same area among the signals input through the OSD unit ( an alpha blending processor configured to perform alpha blending by determining pixels to be displayed in the same region as the upper layer and the lower layer through a switching plane) and a control signal output from the switching plane, and the alpha blending processor It is configured to include a display unit for displaying an image The.

Description

Switching device and method between OSD layers {apparatus and method to switch between OSD layers}

The present invention relates to a vertical switching device and method between On Screen Display (OSD) layers in a display device.

Recently, TV-related technologies are rapidly developing quantitatively and qualitatively as the technology of devices such as digital television, digital camera, PDA, etc. is changed from analog method to digital method. In particular, the number of channels broadcast on TV will increase exponentially by digital method that can operate much more channels than analog in terms of quantity.

Therefore, the user may not only utilize various channels by simply recognizing the names of some channels or broadcasting stations, but also may be difficult to watch the broadcasting programs he / she wants. Therefore, the recent digital broadcasting technology has a broadcasting information guide function for displaying the broadcasting program information of each channel provided from the broadcasting station on the screen so that the viewer can easily identify and select each broadcasting program. In order to cope with the development, the technical development of the broadcasting information guidance function is urgently required.

One of the methods currently used to solve such a requirement is to separate the additional information (subtitle signal and another video signal) transmitted with the video signal from the receiving apparatus and display the superimposed on one video signal (OSD). On Screen Display).

The OSD (On Screen Display) is commonly used as a screen for adjusting a menu by placing a graphic layer on top of a video image. In addition, an alpha value indicating transparency is set in the OSD layer, and the transparency of the plurality of overlapping images is adjusted by using the same so that a plurality of images can be simultaneously displayed on one screen. This method is called alpha blending.

1 and 2 are hardware diagrams illustrating a method of implementing alpha blending according to the prior art. Assuming that an upper OSD layer is OSD1 and a lower OSD layer is OSD2, FIG. 1 is an upper layer. Is a diagram illustrating alpha blending, and FIG. 2 is a diagram illustrating alpha blending when OSD2 is a higher layer.

First, referring to FIG. 1, when the display unit 60 displays a portion where the OSD1 input to the first OSD unit 10 and the OSD2 input to the second OSD unit 20 overlap, the upper layer is displayed. Value of OSD1 Is processed using.

At this time, the Has a value between 0 and 1 when the intensity of the color to be displayed is 1. In other words, the alpha value of the OSD layer is between the minimum and maximum values that a color can have.

Therefore, for alpha blending, the color value of the upper layer OSD1 ( ) Is the alpha value of OSD1 ( Multiply by (30). Subsequently, the color value of the lower layer OSD2 is subtracted from the alpha value of 1 ( Multiply by 40.

The multiplied two result values are added to output the color value to be finally displayed on the display unit 60.

The alpha blending method between the two layers is expressed by the following equation.

At this time, : Color value of OSD1, : Alpha value of OSD1

: Color value of OSD2, : Color value to be displayed.

Next, referring to FIG. 2, when the OSD 1 input to the first OSD unit 10 and the OSD 2 input to the second OSD unit 20 overlap each other, the upper portion of the display unit 60 displays an upper portion. Alpha value of the OSD2 layer Is processed using.

At this time, the Has a value between 0 and 1 when the intensity of the color to be displayed is 1. In other words, the alpha value of the OSD layer is between the minimum and maximum values that a color can have.

For alpha blending, we first set the color value of the upper layer OSD2 ( ) Is the alpha value of OSD2 ( Multiply by 42. Subsequently, the color value of the lower layer OSD1 is subtracted from the alpha value of 1 ( Multiply by (32).

The multiplied two result values are added to output the color value to be finally displayed on the display unit 60.

The alpha blending method between the two layers is expressed by the following equation.

However, such alpha blending is difficult to move up and down smoothly between the upper layer and the lower layer during the alpha blending process.

That is, the alpha blending is calculated by setting the same alpha value in image units at the front of the alpha blending processor when multiplying the alpha value in each layer, so that pixels according to one image cannot be alpha blended through other alpha values. Will be lost. Therefore, partial vertical movement between the upper layer OSD1 and the lower layer OSD2 becomes impossible.

For example, assuming that OSD1 is the upper layer and OSD2 is the lower layer, and the user wants to view the OSD2 further in a predetermined area including the upper layer OSD1, the alpha value of the OSD1 ( ) Becomes '1' and has 100% opacity, the OSD2 portion, which is a lower layer, cannot be seen at all in the overlapping predetermined region.

Accordingly, the present invention has been made to solve the above problems, the device having a layer (switching plane) to determine the top and bottom between the two layers to selectively determine the layer to be placed on the pixel by pixel And to provide a method.

Another object of the present invention is to provide various display effects by allowing the upper and lower layers to be freely adjusted.

A feature of the switching device between OSD layers according to the present invention for achieving the above object is an OSD unit for performing a scaler by receiving a plurality of subtitle signals and / or video signals through a receiver, and a signal input through the OSD unit A switching plane for outputting a control signal for setting an upper layer and a lower layer for each pixel to be displayed in the same area among the pixels and a pixel to be displayed in the same area at the same time through the control signal output from the switching plane And an alpha blending processor configured to perform alpha blending by determining layers and lower layers, and a display unit for displaying an image processed by the alpha blending processor.

Another feature of the switching device between OSD layers according to the present invention for achieving the above object is a first OSD unit for performing a scaler by receiving the subtitle signal and / or video signal OSD1 through the receiver, and through the receiver A second OSD unit which performs a scaler by receiving OSD2, which is a caption signal and / or an image signal simultaneously displayed on the same screen as OSD1, and an upper layer and a lower layer for each pixel among signals input through the first and second OSD units, respectively. An alpha blending processing unit that performs alpha blending by determining an upper layer and a lower layer for each pixel of the OSD1 and OSD2 through a switching plane for outputting a control signal for setting a layer and a control signal output from the switching plane. And a display unit for displaying an image processed by the alpha blending processor. There is.

In this case, the alpha blending processor is configured to display the alpha value of OSD1 in each pixel of the OSD1 signal output from the first OSD unit. A first multiplier for multiplying and an alpha value of OSD2 for each pixel of the OSD2 signal output from the second OSD unit A second multiplier for multiplying and an alpha value of OSD1 for each pixel of the OSD1 signal output from the first OSD unit; A third multiplier for multiplying and an alpha value of OSD2 for each pixel of the OSD2 video signal output from the second OSD unit; A fourth multiplier for multiplying the first multiplier, a first mux for selectively outputting one of the color values of the pixels output from the first multiplier and the second multiplier, and a control signal output from the switching plane; A second mux for selectively outputting one of the color values of the pixels output from the third multiplier and the fourth multiplier according to a control signal output from the switching plane, and each pixel output from the first mux and the second mux It is preferable to include an adder for calculating the final color value to be displayed by adding the color value of the output to the display unit.

Also, the And Preferably has a value between the minimum value (0) and the maximum value (1) that the color to be displayed can have.

A feature of the switching method between OSD layers according to the present invention for achieving the above object is that when a plurality of caption signals and / or video signals are received from the outside from the outside, a plurality of caption signals input to one screen at the same time or Outputting each pixel by performing a scaler using a plurality of OSD units, and using the characteristic information of a plurality of subtitle signals received through the receiver unit and / or a signal input together with the image signals. Determining the order of the upper and lower layers of the pixel layer according to the caption signal and / or the video signal, and generating a control signal according to each of the plurality of signals inputted through the plurality of OSD units through the generated control signal. Determining an upper layer and a lower layer of each star and performing alpha blending; and displaying a final color value of the alpha blended. There makin comprises the step of displaying.

In this case, the alpha blending processing may include determining an order of heights of a plurality of pixels output through a scaler using the generated control signal, and using an alpha value of a pixel layer determined to be the highest among the plurality of pixels. And setting a corresponding alpha value to all pixels, multiplying the color value of each corresponding pixel by the set alpha value, and adding all of the multiplied pixels to calculate a final color value. desirable.

The characteristic information of the signal may be at least one of transparency, color value, height information, and size information of each pixel.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments with reference to the accompanying drawings.

A preferred embodiment of the switching method between OSD layers according to the present invention will be described with reference to the accompanying drawings.

3 is a diagram illustrating a structure implementing alpha blending according to the present invention.

Referring to FIG. 3, first, the first OSD unit 100, which performs a scaler by receiving OSD1, which is a caption signal and / or an image signal, from the outside, is performed on the same screen as the OSD1 through the receiving unit. The second OSD unit 200 receives a subtitle signal and / or an image signal OSD2 displayed at the same time and performs a scaler. A switching plane 400 for outputting a control signal for setting an upper layer and a lower layer for each pixel among the signals input through the first and second OSD units 100 and 200, and the switching. An alpha blending processor 300 for performing alpha blending by determining an upper layer and a lower layer for each pixel of the OSD1 and OSD2 through the control signal SP output from the plane 400, and the alpha blending processor 300. The display unit 500 displays a processed image.

In this case, the alpha blending processing unit 300 may assign an alpha value of OSD1 to each pixel of the OSD1 signal output from the first OSD unit 100. Multiply by The alpha value of OSD2 in each pixel of the multiplier 310 and the OSD2 signal output from the second OSD unit 200. Multiply by The alpha value of OSD1 in each pixel of the multiplier 320 and the OSD1 signal output from the first OSD unit 100. Multiply by The alpha value of OSD2 in each pixel of the multiplier 330 and the OSD2 signal output from the second OSD unit 200. Multiply by The multiplication unit 340 is configured. And said Multiplication unit 310 and A first mux 350 selectively outputting one of color values of pixels output from the multiplier 320 according to a control signal output from the switching plane 400, and Multiplication unit 330 and The second mux 360 selectively outputs one of the color values of the pixels output from the multiplier 340 according to the control signal output from the switching plane 400, and the first mux 350. And an adder 370 that calculates a final color value to be displayed by adding the color value of the pixel and the color value of the pixel output from the second mux 360 and outputs the color value to be displayed on the display unit 500.

When the alpha blending processed by the alpha blending processing unit 300 is expressed by an equation, Equation 3 is obtained.

At this time, : Color value of OSD1, : Color value of OSD2,

: Color value to be displayed.

And said And Is an alpha value selected from the first and second muxes 350 and 360, respectively, and is defined as shown in Table 1 below by the control signal SP output from the switching plane 400. In this case, Table 1 may be changed by the user's setting.

SP description 0 If OSD1 is higher One OSD2 is higher

The switching method between the OSD layers according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

4 is a flowchart illustrating a switching method between OSD layers according to the present invention.

First, as shown in FIG. 4, when a plurality of caption signals and / or video signals are externally received through the receiver (S10), a plurality of caption signals or / and video signals simultaneously input to one screen (2 for simplicity of explanation). OSD1 and OSD2 are input to the first OSD unit 100 and the second OSD unit 200, respectively (S20).

In this case, the caption signal and / or the video signal received through the receiver includes characteristic information of each signal. The characteristic information includes pixel transparency, color, height, and size information.

Accordingly, the switching plane 400 determines the top and bottom order for each pixel of the layer according to each video signal by inputting the characteristic information input together with the caption signal and / or the video signal, and generates a control signal accordingly (S30). ).

Subsequently, the first OSD unit 100 and the second OSD unit 200 perform scalers on the input OSD1 and OSD2 to output the alpha blending processing unit 300 for each pixel, and the switching plane 400 performs the scaler. The control signal corresponding to each pixel output to the alpha blending processing unit 300 is output through S40.

Then, the alpha blending processing unit 300 each pixel of the plurality of image signals OSD1 and OSD2 inputted through the first and second OSD units 100 and 200 through the control signal output from the switching plane 400. The alpha blending process is performed by determining the upper and lower layers of the star (S50).

That is, when the control signal SP output from the switching plane 400 is 0, the alpha blending processor 300 determines the pixel input from OSD1 as the upper layer and the pixel input from OSD2 as the lower layer. . In addition, when the control signal SP output from the switching plane 400 is 1, the alpha blending processor 300 determines a pixel input from OSD1 as a lower layer and a pixel input from OSD2 as an upper layer.

As such, when it is determined that the pixel input from the OSD1 is the upper layer and the pixel input from the OSD2 is the lower layer according to the control signal output from the switching plane 400, when displaying a portion where the two pixels overlap. The upper layer OSD1 is the alpha value And the lower layer OSD2 is alpha value. Alpha blended using.

In addition, if it is determined that the pixel input from the OSD2 is an upper layer and the pixel input from the OSD1 is a lower layer, when displaying a portion where two pixels overlap each other, the upper layer OSD2 is an alpha value. And the lower layer OSD1 is alpha value. Alpha blended using.

At this time, the And Has a value between 0 and 1 when the intensity of the color to be displayed is 1. In other words, the alpha value of the OSD layer is between the minimum and maximum values that a color can have.

Therefore, for alpha blending, the first layer is the color value ( ) Is multiplied by the alpha value. Subsequently, the lower layer color value is multiplied by 1 minus the alpha value. Then the sum of the two pixels adds up to 1, resulting in 100% opacity.

Therefore, the resultant color value to be displayed is added by adding the two result values multiplied by the multiplication result and displayed on the display unit 500 (S60).

Therefore, even when the opacity of the OSD1 and OSD2 is 100% and the alpha value is '1', the upper layer to be displayed can be determined for each pixel according to the control signal SP output from the switching plane as shown in Equation 4.

If SP = 1:

Here, when no signal is simultaneously input to one screen among a plurality of signals input to the first OSD unit 100 and the second OSD unit 200, the alpha blending processing unit 300 is bypassed and immediately OSD 1 or OSD 2 is displayed on the display unit 500. This is a general case and a detailed description thereof will be omitted.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

As described above, the method for switching between OSD layers according to the present invention has the following effects.

First, it is possible to expect various display effects that could not be used in the conventional method by freely adjusting the upper and lower pixels for each layer between layers.

Second, it can be utilized in all display devices using the OSD.

1 and 2 are hardware diagrams illustrating a method of implementing alpha blending according to the prior art.

3 is a diagram illustrating a structure implementing alpha blending according to the present invention.

4 is a flowchart illustrating a method of implementing alpha blending according to the present invention.

* Explanation of symbols for main parts of the drawings

100: first OSD unit 200: second OSD unit

300: alpha blending processing unit 310: Multiplication

320: Multiplication Unit 330: Multiplication

340: Multiplication unit 350: the first mux

360: second mux 370: adder

400: switching plane 500: display unit

Claims (7)

An OSD unit configured to receive a plurality of caption signals and / or video signals through a receiver to perform a scaler; A switching plane outputting a control signal for setting an upper layer and a lower layer for each pixel to be displayed in the same area among the signals input through the OSD unit; An alpha blending processor configured to perform alpha blending by judging pixels to be displayed in the same region as the upper layer and the lower layer through a control signal output from the switching plane; And a display unit for displaying an image processed by the alpha blending processor. A first OSD unit which receives a subtitle signal and / or an image signal OSD1 and performs a scaler through a receiver; A second OSD unit configured to receive a scaler by receiving a subtitle signal and / or an image signal OSD2 simultaneously displayed on the same screen as the OSD1 through a receiver; A switching plane for outputting a control signal for setting an upper layer and a lower layer for each pixel among the signals input through the first and second OSD units; An alpha blending processor configured to perform alpha blending by determining an upper layer and a lower layer for each pixel of the OSD1 and OSD2 based on a control signal output from the switching plane; And a display unit for displaying an image processed by the alpha blending processor. The method of claim 2, wherein the alpha blending processing unit Alpha value of OSD1 for each pixel of the OSD1 signal output from the first OSD unit A first multiplication unit for multiplying Alpha value of OSD2 for each pixel of the OSD2 signal output from the second OSD unit A second multiplier for multiplying Alpha value of OSD1 for each pixel of the OSD1 signal output from the first OSD unit A third multiplication unit for multiplying Alpha value of OSD2 for each pixel of the OSD2 video signal output from the second OSD unit A fourth multiplication unit for multiplying A first mux for selectively outputting one of color values of pixels output from the first multiplier and the second multiplier according to a control signal output from the switching plane; A second mux for selectively outputting one of color values of pixels output from the third and fourth multipliers according to a control signal output from the switching plane; And an adder which adds a color value of each pixel output from the first mux and the second mux, calculates a color value to be finally displayed, and outputs the color value to the display unit. The method of claim 3, wherein remind And Is a value between the minimum value (0) and the maximum value (1) that the color to be displayed can have. When a plurality of caption signals and / or video signals are received from the outside through a receiver, a plurality of caption signals and / or video signals simultaneously inputted on one screen may be scaled using a plurality of OSD units to output for each pixel. Steps, Determining the order of the upper and lower layers of the pixel layer according to each caption signal and / or image signal by using the characteristic information of the signal input together with the plurality of caption signals and / or image signals received through the receiver, and controlling accordingly Generating a signal, Determining the upper and lower layers for each pixel of the plurality of signals inputted through the plurality of OSD units through the generated control signal and performing alpha blending; And displaying the alpha blended final color value on a display unit. The method of claim 5, wherein the alpha blending step Determining the order of the heights of the plurality of pixels output through the scaler by using the generated control signal; Setting an alpha value corresponding to an order to all pixels using an alpha value of a pixel layer determined to be the highest among the plurality of pixels, and multiplying a color value of each corresponding pixel by the set alpha value; And adding all the multiplied pixels to calculate a final color value. The method of claim 5, And the characteristic information of the signal is at least one of transparency, color value, height information, and size information of each pixel.