CN100412947C - Screen display embodying method with multiple paths - Google Patents

Abstract

A multi-path screen display embodying method, comprising: obtaining a main image and a sub-image signal through a receiving unit and inputting a plurality of OSD layer signals overlapped and displayed by using these signals and an OSD; from the plurality of OSD layer signals, Separately distinguish the main OSD layer signal overlapping with the main image signal, and the sub-OSD layer signal overlapping with the sub image signal; judge the main image signal and the main OSD layer signal as the upper layer and the lower layer, run the main α mixing, and output through the main channel For the main display unit; convert the sub-OSD layer signal to the display format of the sub-display unit, judge it as the upper layer and the lower layer together with the sub-image signal, run the secondary α mixing, and output it to the sub-display unit through the sub-channel. The present invention does not add an OSD layer, and can also independently output the data path structure of the OSD with multiple screens; for the VCR and the main screen, the OSD can be output separately, and the data in subtitles or data playback can be independently processed for recording/output.

Description

Screen display embodying method with multiple paths

technical field

The present invention relates to the data path of on-screen display (OSD) processing, in particular to an on-screen display embodying method with multiple paths for performing OSD processing on multiple outputs.

Background technique

Recently, as the technologies of devices such as digital TVs, digital cameras, and PDAs (Pocket Computers) are converted from analog to digital, TV-related technologies tend to develop rapidly in terms of quantity/quality. In particular, in terms of quantity, compared with the analog method, the number of channels broadcast on TV will also increase dramatically due to the digital method that can use more channels.

Therefore, the user cannot use a variety of channels simply by identifying several channels or station names, and it may become difficult to watch the broadcast program he wants. Therefore, the latest digital broadcasting technology is to enable users to grasp various broadcasting programs relatively easily, and can choose. The development of relevant technologies, therefore, the technical development of the program information introduction function is imminent.

Among the methods to solve this requirement, one of the methods currently used is to superimpose the screen displayed on one image signal after the receiving device separates the additional information (subtitle signal and/or other image signal) transmitted together with the image signal. Display (hereinafter referred to as OSD) method.

In the OSD method, generally, the graphics layer is placed on the top of the video image, and it is more common to use it as the screen of the adjustment menu. In addition, an α value representing transparency is set in the OSD layer, and these are used to adjust the transparency of multiple overlapping images, so that multiple images can be displayed on one screen at the same time. Such a method is called Alpha Blending.

FIG. 1 is a schematic diagram of a prior art method of embodying α-blending in hardware, and shows α-blending when the upper OSD layer is assumed to be OSD1 and the lower OSD layer is assumed to be OSD2.

It will be described with reference to FIG. 1 that after the OSD1 input to the first OSD unit 10 and the OSD2 input to the second OSD unit 20 are subjected to α blending processing using the α value _α1 of the upper layer OSD1, the data path is used to provide the display unit 40 with Multiple display output.

In the α blending, the α value α ₁ of the OSD1 is multiplied by the color value C ₁ of the OSD1 of the upper layer in the α ₁ multiplier 32 . Thereafter, the 1-α ₁ multiplication unit 34 multiplies the value 1-α ₁ obtained by subtracting the α value from 1 by the OSD2 color value of the lower layer. In addition, the adder 36 sums up the two results of the multiplication, and outputs the color value that can be finally displayed to the display unit 40 .

In this case, the _α1 has a value between 0 and 1 when the intensity of the color to be displayed is assumed to be 1. That is, the alpha value of the OSD layer is between the minimum and maximum values a color can have.

If the α mixing method between the two layers is expressed in a mathematical formula, it is the following example of mathematical formula 1.

【Mathematical formula 1】

C ₀ ＝C ₁ s(α ₁ )+C ₂ s(1-α ₁ )

At this time, C ₁ : the color value of OSD1, α ₁ : the α value of OSD1

C ₂ : the color value of OSD2, C ₀ : the color value to be displayed.

In addition, as in Mathematical Formula 1, the color value of the alpha blending will use the data paths of multiple OSD layers, and FIG. 2 is a schematic diagram showing the data paths of the basic OSD layers.

At this time, Figure 2 is for sequential description, and each OSD layer is represented by a series structure instead of the parallel structure of Figure 1, and the upper and lower relationship of each OSD layer is assumed to have OSD 0, OSD 1, OSD from top to bottom 2 order. In order to describe the sequential α blending process, the integrated view of the OSD α blending unit will be omitted in the subsequent drawings.

It will be explained with reference to Figure 2 that the OSD layer data path depends on the α mixing order between layers, if the OSD α mixing is run in the order of OSD 0 (30c), OSD 1 (30b), OSD 2 (30c) from top to bottom, each The output value of the OSD layer is as shown in Mathematical Formula 2 in the following example.

【Mathematical formula 2】

C _V2 ＝C ₂ s(α ₂ )+Vs(1-α ₂ )

C _V21 ＝C ₁ s(α ₁ )+C _V2s (1-α ₁ )

C _V210 ＝C ₀ s(α ₀ )+C _V21 s(1-α ₀ )0 _mo

O _m0 = C _V210

At this time, C ₀ , C ₁ , C ₂ : the color value of OSD1, α ₀ ·α ₁ , α ₂ : the α value of OSD1

C _V2 : alpha blending result of image V and OSD2

C _V21 : alpha blending result between image V and OSD2, OSD1

C _V210 : α blending result between image V and OSD2, OSD1, OSD0

O _m0 : OSD main channel output

The data path method of the OSD layer formed in this way is used in the form of SSMD (Single Source Multi-Dilplay) OSD, which can be defined as an OSD embodiment with data paths transmitted by multiple outputs after a video source code is mixed with OSDα Way.

FIG. 3 is a schematic diagram showing a general OSD layer data path method SSMD OSD method.

It will be explained with reference to FIG. 3 that an input video source code V _m is simultaneously output to the main channel O _m0 and the sub-channel O _S0 as the OSDα mixing result C _V210 . In this way, two outputs are set at the OSD embodying block. After the secondary channel O _S0 , the VCR (video recorder) scaler 50 is used for scaling, so that the same image (including OSD) of the main channel displayed now can be displayed in a variety of ways. The size output is displayed.

As described above, the SSMD has a structure in which the same image as the OSD layer displayed on the sub-channel is also displayed on the main channel. Therefore, if it is desired to record the main channel with the sub-channel while viewing the main channel with the main channel, there is a problem that it is impossible to selectively display images on the sub-channel for recording different images from the main channel. OSDs.

For example, if the user only appreciates the video image of the original playback signal displayed through the main channel, after recording the information of the OSD layer through the sub-channel, when he wants to enjoy the additional playback image of the information of the OSD layer, the image recorded through the sub-channel is only Recording the exact same image as displayed through the main channel, therefore, it is not possible to satisfy user requirements for this.

In addition, since the display unit of the main channel and the display unit of the sub channel are arranged differently from each other, the display formats are also set differently. But generally speaking, the sub-channel is the signal input mixed with OSDα obtained from the corresponding display format of the main channel, and only the size conversion processing of the sub-channel display part is performed through simple scaling processing.

Therefore, sub-channels having such a channel also change the size of the OSD image at the same time, which may cause loss. These will be described in detail below with reference to the drawings.

Fig. 4 a and Fig. 4 b are the schematic diagrams that represent the OSD usage embodiment of the data path method of general OSD layer-SSMD OSD mode, Fig. 4 a is the main display picture that main channel displays, Fig. 4 b is the sub-display picture that sub-channel displays.

It will be explained with reference to FIG. 4a that as the input of the main channel image, the format V _m is 1280*720p; the main channel display format D _m is 1280*720p. In addition, the display formats of the main channel OSD layers OSD0, OSD1, and OSD2 are 256*256p respectively.

At this time, as shown in Fig. 4b, as the input of the sub-channel image, the sub-channel display format D _s is 720*480i, and the display formats of the sub-channel OSD layers OSD0, OSD1, and OSD2 are 144*170i respectively.

Here, the reason why the display format of the OSD layer of the main channel in FIG. 4a is different from that of the OSD layer of the sub-channel in FIG.

Therefore, the OSD layer image on the main channel is input in a regular quadrangular shape, and the image of the sub-channel OSD layer becomes a rectangular straight quadrangular output with a width and length of 144 and 170 respectively. If there is subtitle information instead of an image, the subtitle may be distorted and cannot be read.

With the data path of the OSD block used by the prior art digital television explained above, the case of providing multiple display output has the following problems:

First, since the main/sub-channel process is the same until the OSD output, if the sub-channel is used to convert the sub-channel after OSDα mixing, the size of the OSD image will also change at the same time, and loss will occur .

Second, the OSD layer displayed by the sub-channel has a structure that can be displayed by the main channel. Therefore, if you use the main channel to enjoy the main channel, and use the sub-channel to record the main channel, it is impossible to perform OSD display only on the sub-channel.

Contents of the invention

The present invention proposes a method for displaying on-screen display with multiple paths in order to solve the above-mentioned problems. Provides improved OSD functionality.

Another object of the present invention is to provide a structure in which data paths can be selectively used without adding an OSD layer.

Another object of the present invention is to embody the MSMD OSD embodying mode with data paths transmitted by multiple outputs after operating OSDα mixed processing for multiple video source codes.

In order to achieve said object, the feature of the on-screen display (OSD) embodying method with multipath of the present invention is to constitute with the following steps: by the receiving part, obtain main image and sub-image signal and utilize described main image and sub-image signal and OSD, A step of inputting a plurality of OSD layer signals overlapped and represented; from the plurality of OSD layer signals, respectively distinguishing a main OSD layer signal overlapping with a main image signal, and a sub-OSD layer signal overlapping with a sub image signal; The step of judging the main image signal and the main OSD layer signal as an upper layer and a lower layer, running main α mixing, and outputting to the main display part through the main channel; converting the secondary OSD layer signal into a display format of the secondary display part Thereafter, together with the sub-image signal, it is judged as an upper layer or a lower layer, a secondary α blending is performed, and the sub-channel is output to the sub-display unit.

In order to achieve the above object, other features of the multi-path OSD embodying method of the present invention include the following steps: the main image and sub-image signals are obtained by the receiving unit, and the main image, sub-image signals and OSD are used to overlap and represent A step of inputting a plurality of OSD layer signals; a step of judging the main image signal and the OSD layer signal as an upper layer and a lower layer, performing main α mixing, and outputting to the main display part through the main channel; from the OSD layer Among the signals, a step of selecting at least one of the screen display layer signals according to an external control signal; judging the OSD layer signals other than the selected OSD layer signal and the main image signal as an upper layer and a lower layer, re-running the main α mixing, and outputting to the main display unit through the main channel; judging the selected OSD layer signal and the sub-image signal as the upper layer and the lower layer, running the secondary α mixing, and outputting through the sub-channel Steps for the sub-display section.

At this time, the main image signal and the sub-image signal should be the same image source code.

Other objects, characteristics, and strengths of the present invention will be more clearly understood through the detailed description of the embodiments with reference to the accompanying drawings.

Effect of the present invention:

As mentioned above, the multi-path screen display embodying method of the present invention has the following effects:

First, it is possible to implement a data path structure that can independently output OSDs on multiple screens without adding an OSD layer.

Second, OSD can be output separately for VCR and main screen, so data in subtitles or data playback can be independently processed for recording/output.

Third, it is applicable to all display devices using OSD.

In order to further illustrate the purpose, structural features and effects of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic diagram showing a method of alpha mixing embodying the prior art.

FIG. 2 is a schematic diagram showing a data path of a basic OSD layer.

FIG. 3 is a schematic diagram showing a general OSD layer data path method-SSMD OSD method.

Fig. 4 a and Fig. 4 b are the schematic diagrams that represent the OSD usage embodiment of the data path method of general OSD layer-SSMD OSD mode.

Fig. 5 is a schematic diagram representing the data path method MSMS OSD mode of the OSD layer of the present invention.

Fig. 6 is a schematic diagram representing the OSD layer data path method-selective MSMS OSD mode of the present invention.

7a to 7c are schematic diagrams showing an OSD usage embodiment of the OSD layer data path method-selective MSMS OSD mode of the present invention.

Explanation of the symbols of the main parts in the accompanying drawings:

10, 100: the first OSD department 20, 200: the second OSD department

30: α mixing processing unit 32: α ₁ multiplying unit

34: 1-α ₁ multiplication department 36: Addition department

40: Display unit 50: VCR scaler (Scaler) device

300: Third OSD Department 400: Main Alpha Mixing Department

500: Secondary alpha mixing section 600: Splitter

Detailed ways

Embodiments of the OSD embodying method with multipath of the present invention will be described below with reference to the accompanying drawings.

Fig. 5 is a schematic diagram representing the data path method MSMS OSD mode of the OSD layer of the present invention.

It will be explained with reference to FIG. 5 that firstly, OSDα mixing is performed on the two input image sources (V _m , V _s ), and output to the main channel O _m0 and the sub-channel _OS0 at the same time. At this time, since the two images V _m and V _s are input with the same source code, they can be separated.

At this time, OSD2 ( 30 a ) and OSD1 ( 30 b ) are α-mixed with the main image source code V _m as in the OSD α mixing unit 30 and displayed as the main channel. In addition, OSD0 (30c) is α-mixed with the sub-image source code V _s and displayed as a sub-channel.

Here, before running OSDα mixing, the main channel image source code V _m is converted into a display format according to the main channel OSD layer, and then input to OSD2 (30a) and OSD1 (30b). In addition, the sub-image source code V _s is directly input to the VCR scaler 50 without going through the display format of the OSD layer of the main channel, and then input to OSD0 after being converted into the display format of the OSD layer of the sub-channel (30c).

Therefore, after running OSD α mixing, it can be displayed with a size suitable for the display format of the sub-channel without OSD0(30c) image loss. In addition, the OSD layer is assigned independently to the sub-channel so that it can be set and processed independently of the main channel.

Fig. 6 is a schematic diagram representing the OSD layer data path method-selective MSMS OSD mode of the present invention.

It will be explained with reference to FIG. 6 that first, two image source codes V _m , O _sl signals and OSD layers OSD0, OSD1, OSD2 are input from the outside.

At this time, the OSD layers OSD1 and OSD2 are scaled by the second OSD unit 200 and the third OSD unit 300 respectively, input to the main α blending unit 400, and take the basic OSD data path after running the OSD α blending process.

In addition, the OSD layer OSD0 passes through the splitter 600 according to the control signal OSD0_sub_on controlling the main/sub-channel of OSD0. If the control signal OSD0_sub_on is 0, the basic OSD data path is adopted; if it is allocated by the sub-channel, the If the control signal OSD0_sub_on is 1, it is separated from the other OSD layers (the second OSD part 200 and the third OSD part 300), and the calibration is performed by the first OSD part 100 and input to the secondary α mixing part 500. OSD alpha mixed processing.

At this time, in order to perform OSD processing on the sub-channel, OSD0 and the sub-channel image source code _Osl are added with a secondary α blending unit 500 for performing α blending with other α values (transparencies).

Meanwhile, in the OSD layer, not limited to OSD0, the second OSD part 200 and the third OSD part 300 can also operate separately from other OSD layers by using multiple splitters.

For this selective OSD processing block, the data path of the subchannel scaler should also be designed to be selectively replaced.

Therefore, when the operation is performed as shown in Figure 3, after the OSDα is mixed, the secondary display format is converted, and the calibration should be processed after the OSD. In addition, when performing actions as shown in Figure 5, after converting to the secondary display format in advance, make it run OSDα mixing, and the calibration should be processed before OSD. This is to adjust the processing sequence of calibration and OSD according to a certain control signal, so that it can be easily processed.

Fig. 7 a to Fig. 7 c are the schematic diagrams that represent the OSD layer data path method of the present invention-the OSD using embodiment of selective MSMD OSD mode, Fig. 7 a is the main display screen that the main channel displays, Fig. 7 b is that utilizes SSMD OSD mode to use Sub-display screen for sub-channel display. In addition, FIG. 7c is a sub-display screen displayed in a sub-channel using the MSMSOSD method. It will be explained with reference to FIG. 7a that, as the main channel image input, the format V _m is 1280*720p; the main channel display format D _m is 1280*720p. In addition, the display formats of the main channel OSD layers OSD0, OSD1, and OSD2 are 256*256p respectively.

At this time, as shown in Fig. 7b, as the input of the sub-channel image, the sub-channel display format D _s is 720*480i, and the display formats of the sub-channel OSD layers OSD0, OSD1, and OSD2 are 144*170i respectively.

At the same time, as the MSMD sub-channel image input that is allocated by the sub-channel and operates separately from other OSD layers, as shown in Figure 7c, the sub-channel image input format _OS1 is 720*480i, and the sub-channel display format D _s is 720 *480i. In addition, the display formats of the sub-channel OSD layers OSD0, OSD1, and OSD2 are 256*256i respectively.

If such a selective MSMD structure is used, the OSD0_sub_on signal can be used to operate in the SSMD mode shown in Figure 7a and Figure 7b, or in the MSMD mode as shown in Figure 7c.

At this time, taking Figure 7c as an example, the input size of OSD0 allocated by the sub-channel is 256*256, and the image data loss can be prevented because of the faithful output.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than as a limitation to the present invention, as long as within the scope of the spirit of the present invention, the above-described embodiments Changes and modifications will fall within the scope of the claims of the present invention.

Claims (4)

1. A method for displaying on screen with multipath, is characterized in that comprising the following steps: Obtaining the main image and sub-image signals through the receiving unit, and using the main image and sub-image signals and the screen display to display multiple screen display layer signals through overlapping screens; From the plurality of screen display layer signals, respectively distinguishing the main screen display layer signal overlapping with the main image signal, and the sub-screen display layer signal overlapping with the sub image signal; The step of judging the main image signal and the main screen display layer signal as an upper layer and a lower layer, performing main alpha mixing, and outputting to the main display part through the main channel; After the sub-screen display layer signal is converted into the display format of the sub-display unit, together with the sub-image signal, it is judged as an upper layer and a lower layer, and secondary α mixing is performed, and output to the sub-display unit through the sub-channel step. 2. The screen display embodiment method with multipath as claimed in claim 1, characterized in that: The main image signal and the sub image signal are the same image source code. 3. A method for displaying on screen with multipath, is characterized in that comprising the following steps: Obtaining the main image and sub-image signals through the receiving unit, and using the main image and sub-image signals and the screen display to display multiple screen display layer signals through overlapping screens; The step of judging the main image signal and the plurality of screen display layer signals as an upper layer and a lower layer respectively, performing main alpha mixing, and outputting to the main display part through the main channel; From the plurality of screen display layer signals, according to an external control signal, at least a step of selecting one of the plurality of screen display layer signals; The step of judging the screen display layer signal and the main image signal except the selected screen display layer signal as the upper layer and the lower layer, re-running the main α mixing, and outputting to the main display part through the main channel; A step of judging the selected screen display layer signal and the sub-image signal as an upper layer and a lower layer, performing secondary alpha mixing, and outputting to a sub-display unit through a sub-channel. 4. The screen display embodiment method with multipath as claimed in claim 3, characterized in that: The main image signal and the sub image signal are the same image source code.

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