JPH11146275A - Image processing display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processing display device which enables processing for making display information much easier to watch in the case of on-screen display(OSD) for display the information of characters or graphics while overlapping them on the image frame (video image) of a television or VTR. SOLUTION: Blend values α, β and γ from an external CPU 14 are stored in a mode register 16 inside an OSD control part 100. The α is a blend value for OSD image, the β is a blend value for video image overlapped with an OSD image and the γ is a blend value for video image in a transparent area. The multiplied result of the color information data of a pallet reference part 13 and an OSD blend value output 18 of a mode selecting part 17 at a multiplier 110 expresses an OSD image component. The multiplied result of the video data and a video blend value output 19 at a multiplier 111 expresses a video image component. These multiplied results are added by an adder 112 and outputted as blending image data. Therefore, the display luminance of the video image in the transparent area can be adjusted by γ and the OSD image can be made easy to watch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing and display device, and more particularly, to an on-screen display for superimposing control information or service information such as characters and graphics on an image frame of a television or VTR. The present invention relates to an image processing display device having a function (hereinafter, referred to as OSD).

[0002]

2. Description of the Related Art An image processing and display apparatus having an OSD function for superimposing and displaying control information such as characters and graphics or image signals of service information (hereinafter abbreviated as service information) on a video frame such as a television signal. In the generation of an image signal such as service information, it is generally necessary to use color information in which pixels constituting an image are arranged in display scanning order. In order to specify the color information to be displayed at a certain pixel position, this color information is used. Instead, a method of designating a color information number in which a number is assigned to color information to be displayed is known. The method of designating the color information number has an advantage that when the number of colors of an image is small, the total data amount required for processing can be effectively suppressed.

For example, if 6 bits are used for a luminance signal and 5 bits are used for a blue color difference signal and a red color difference signal as color information, 16 bits are needed for color information for a certain pixel. However, when the total number of colors in an image is limited, for example, when it is limited to 16 colors, a number may be assigned to 16 pieces of color information, and the color information number can be expressed by 4 bits. . This method of specifying a color information number is widely used as a standard signal format in OSD.

In addition, OSD images can be displayed on televisions and VTRs.
The simplest method for superimposing and displaying an image frame (hereinafter, referred to as a video image) such as the above is to replace pixels of the video image with pixels of the OSD image at the display position of the OSD image. At this time, a variety of displays can be performed by multiplying the color information of the video pixels and the OSD pixels by a certain coefficient (this coefficient is called a blend value) to obtain the sum, instead of simple replacement. Are known. That is, when the blend value for the OSD image is α and the blend value for the video image is β, α × (O
By performing image processing of (SD pixel color information) + β × (video pixel color information), various displays can be performed.
However, α and β are respectively in the range of 0 ≦ α ≦ 1, 0 ≦ β ≦ 1.

In particular, when the blend value β is represented by β = 1−α, the display result looks like a video image can be seen through from below the OSD image. This is called α blending and is known as a special effect in OSD display. However, when performing such image processing, it is necessary to separately add a color information number sequence arranged in the display scanning order and blend information called an α value indicating a blending ratio to the OSD image in addition to the color information. .

As described above, in α blending, O
The video image is displayed so that it can be seen through from under the SD image. This alpha blending function allows a video image to be displayed on an OSD screen when the OSD screen is relatively large with respect to the video screen.
This is effective when the amount of display information is increased by transmitting light from below the D image. For example, when displaying the channel of a television program or the current time as character information, α
If no blending is performed, information of a video image hidden under the character is not displayed. On the contrary,
If alpha blending is performed on the premise that characters can be clearly distinguished, the amount of information received from a display image increases as compared to the case without alpha blending.

[0007] Further, when, for example, character information is displayed in the display area of the OSD image, a portion having no information amount occurs in a character or a gap between characters in the OSD screen. By displaying the pixels of the video image as a transparent area as it is without masking that portion, the amount of information on the entire display screen can be increased. Such a transparent area is called a transparent area, and it is required as an essential condition that the transparent area can be specified at an arbitrary position in the OSD image.

FIG. 7 shows a conventional example of an image processing and display apparatus which realizes the α blending function and the transparent function. The conventional image processing display device includes at least an external storage unit 70, a CPU 74, and an OSD control unit 700. The external storage unit 70 stores video data (moving image data) to be displayed and an OSD
Stores image data. Α representing blending information
The value is sent from the external CPU 74 or the like, and is written to the register 76 via the CPU interface 75.

The memory control unit 71 stores the OSD data in the external storage unit 70 before the display start timing of the OSD image.
Read from. The read OSD data is written to the OSD data buffer 72. Palette reference section 73
Reads the OSD data from the OSD data buffer 72 at the display start timing of the OSD image, and sends the color information (palette) indicated by the color information number to the multiplier 710. In addition, the memory control unit 71 reads the video data from the external storage unit 70 in accordance with the display timing of the video image, and sends the video data to the multiplier 711.

The OSD blend selector 77 controls the output as follows in accordance with the scanning position of the screen being displayed.
FIG. 8B shows the relationship between the screen scanning position and the output of the OSD blend selection unit 77. When there is an OSD image at the screen scanning position, the OSD blend selection unit 77 outputs an α value to be multiplied with the OSD image. Even if the screen scanning position is within the OSD screen, 0 is output if that part is specified in the OSD non-display area (OSD transparent area). Also, when there is no OSD image at the screen scanning position, 0 is output.

The output of the video blend selector 79 changes as follows in accordance with the scanning position of the screen being displayed.
FIG. 8B shows the relationship between the screen scanning position and the output of the video blend selection unit 79. When there is an OSD image at the screen scanning position, the video blend selection unit 79 obtains a blend value to be multiplied by the video image via a subtractor 78 that subtracts 1 from the α value written in the register 76. And outputs the obtained 1-α. Screen scanning position is OS
Even in the D screen, if that part is specified in the transparent area, 1 is output. Also, 1 is output when there is no OSD image at the screen scanning position.

The multiplier 710 includes a pallet reference unit 73 and an O
The output value of the SD blend selection unit 77 is multiplied. The output of the multiplier 710 becomes an OSD image component on the display screen. The multiplier 711 multiplies the video image read from the external storage unit 70 via the memory control unit 71 by the output value of the video blend selection unit 79. This multiplier 7
The output of 11 is a video image component on the display screen. The results of the multipliers 710 and 711 are added by an adder 712, and an α blending image is output.

FIG. 8A shows a display result when the OSD image 82 is α-blended on the video screen 80.
The display result can be classified into a non-transparent section 82a in the OSD screen, a transparent (transparent) section 82b in the OSD screen, and a video screen section, that is, an outside 82c of the OSD screen.
When that part of the OSD screen is the OSD display area, the OSD screen 82 and the video screen 80 that overlap each other are α-blended. Also, even in the OSD screen, when that part is designated by the transparent area 82b, only the video screen is displayed. Naturally outside the OSD screen 8
If it is 2c, only the video screen is displayed.

The α-blending function and the transparent function are described in, for example, Nikkei Electronics, No. 676, November 18, 1996
Date, pages 114 to 116.

[0015]

According to the conventional example described above, the α blending function and the transparent function are effective in suppressing redundant components in an OSD image and providing more information to a user at the time of display. However, FIG.
As can be seen from the classification of the screen area shown in (a), there is an uncontrollable area in the display screen. For example, the OSD screen transparent section 82b has a fixed output of a video image. Therefore, depending on the display brightness of the video image, the OSD screen 82
There is also a problem that the character information displayed in the inside becomes difficult to see.

Accordingly, an object of the present invention is to make the display brightness of a video image around characters lower (slightly darken) when displaying an OSD image such as character information in a video screen so that the information can be more easily viewed. It is an object of the present invention to provide an image processing display device having an OSD function capable of performing the above-mentioned processing.

[0017]

In order to solve the above-mentioned problems, an image processing and display apparatus according to the present invention employs an on-screen display function for superimposing and displaying control information such as characters and graphics or service information on a video image. When an OSD image is multiplexed on a video image and displayed, a blending function that allows the video image to be seen through from below the OSD image and a transparent area where the video image is displayed through at the position of the OSD image can be specified. An OSD having a first parameter for controlling an OSD image in the OSD image display area and a second parameter for controlling a video image in the OSD image display area for controlling the function.
In the image processing display device provided with a control unit, the OSD
The control unit is further provided with a third parameter for controlling a video image in the transparent area.

Further, the image processing and display apparatus according to the present invention comprises:
When multiple OSD images are simultaneously multiplexed and displayed on a video image by an on-screen display function that superimposes control information or service information such as characters and graphics on the video image, the video image is displayed from below each OSD image. Blending function to show through and OS
A first parameter for controlling an OSD image in each OSD image display area and a video in each OSD image display area for controlling a function capable of designating a transparent area in which a video image is displayed as a through image at the position of the D image An OSD control unit having an OSD control unit having a second parameter for controlling an image, wherein the OSD control unit further includes a third parameter for controlling a video image in each transparent area, , And synthesizes the OSD image with the lowest priority with the video image, and uses the result as a new video image as the next O
The above OS is used so that the synthesis with the SD image is repeated in the same manner.
A D control unit may be configured.

In the above image display processing device, O
It is preferable that the SD controller further includes a fourth parameter for controlling a video image outside the OSD image display area.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an image processing and display apparatus according to the present invention is to superimpose control information or service information such as characters and graphics on an image frame (video image) of a television or VTR. When an on-screen display image (OSD image) is multiplexed and displayed on a video image by an on-screen display function to be displayed, a blending function that allows the video image to be seen through from below the OSD image, In order to control the function that can specify a transparent area where a video image is displayed through, an OS in the OSD image display area is controlled.
In an image processing and display apparatus including an OSD control unit having a first parameter α for controlling a D image and a second parameter β for controlling a video image in an OSD image display area, the OSD control unit includes Is further provided with a third parameter γ for controlling the video image in the transparent region of FIG.

By providing the parameter γ for controlling the transparent area in the OSD screen as described above, the output of a video image displayed in the transparent area in the conventional OSD screen is fixed. The problem that the display of the OSD image becomes difficult in some cases can be solved. That is, by setting the value of the parameter γ to a value that reduces the display luminance of the video image around the character, there is an effect that the character information and the like can be more easily viewed.

[0022]

Next, a more specific embodiment of the image processing and display apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

<Embodiment 1> FIG. 1 is a block diagram showing an embodiment of an image processing and display apparatus according to the present invention. As shown in FIG. 1, the image processing and display apparatus according to the present embodiment includes at least an external storage unit 10, a CPU 14, and an OSD control unit 10.
0. The external storage unit 10 stores moving image data (video data) to be displayed and OSD image data (OSD data) to be superimposed and displayed thereon. CP
U14 outputs α, β, and γ values that are parameters for blending. Here, α is a blend value for the OSD image, β is a blend value for the video image overlapping the OSD image, and γ is a blend value for the video image in the transparent area (transparent area). The range of each value is 0 ≦ α ≦ 1, 0 ≦ β ≦ 1, 0 ≦ γ ≦ 1. The OSD control unit 100 includes a memory control unit 11, an OSD
Data buffer 12, pallet reference unit 13, CPU interface 15, mode register 16, mode selection unit 1
7, the multiplier 110, 111, and the adder 112.

The OSD control unit 100 thus configured
Works as follows. First, the blending parameters α, β, and γ sent from the external CPU 14 or the like via the CPU interface 15 are written in the mode register 16.

The memory control unit 11 stores the OSD data in the external storage unit 10 before the display start timing of the OSD image.
Read from. The read OSD data is written to the OSD data buffer 12. Pallet reference section 13
Reads the OSD data from the OSD data buffer 12 when the OSD image display start timing comes,
The color information (palette) indicated by the color information number, which is data, is sent to the multiplier 110. That is, a color information data table (for example, a luminance signal 6 bits, a blue color difference signal 5 bits, a red color difference signal 5
Table of color information data stored in correspondence with the color number of 16-bit color information data composed of 16 bits, and outputs color information data corresponding to the color information number of the read OSD data. .

The memory control unit 11 stores the video data in the external storage unit 1 according to the display timing of the video image.
Read from 0 and send to multiplier 111.

The mode selection unit 17 includes a mode register 16
The blending values α, β, and γ are switched between an OSD blend value output 18 and a video blend value output 19 in accordance with the scanning position of the screen being displayed.

FIG. 2B shows the relationship between the screen scanning position and the output of the mode selection unit 17. When there is an OSD image at the screen scanning position, the mode selection unit 17 outputs the OSD blend value output 18
Is output as a video blend value output 19 and a blend value β is output as a video blend value output 19. Even if the screen scanning position is within the OSD screen, if that part is designated by the OSD non-display area (OSD screen transparent area), the OSD blend value output 18
Is output as a video blend value output 19 and a blend value γ is output as a video blend value output 19. When there is no OSD image at the screen scanning position, 0 is output as the OSD blend value output 18 and 1 is output as the video blend value output 19.

The multiplier 110 multiplies the output of the palette reference section 13 by the OSD blend value output 18 of the mode selection section 17. The result of this multiplication is the OSD on the display screen.
Represents an image component. The multiplier 111 multiplies the video data by the video blend value 19 of the mode selector 17.
The result of the multiplication represents a video image component on the display screen. The results of the multipliers 110 and 111 are added by the adder 112 and output as blending image data.

FIG. 2A shows the relationship between the video screen 20, the OSD screen 22, and the blend parameters of each display area as an example of the display screen in this embodiment. The display result can be classified into a non-transparent portion 22a in the OSD screen, a transparent portion 22b in the OSD screen, and a video screen outside 22c. Here, the color information of the OSD pixel is “osd”,
When the color information of a video pixel is expressed as “video”, the OS
In the case where the portion is the OSD display area in the D screen 22, the overlapping OSD screen 22 and video screen 20 are represented by α ×
The processing is performed as “osd” + β × “video”. In particular, when there is a relation of β = 1−α, α blending is performed. Also, even in the OSD screen, when that part is designated by the transparent area 22b, γ × “video”
Is processed as In the case of the OSD screen outside 22c, only the video screen is displayed.

Therefore, by selecting the blend value γ to an appropriate value, the display brightness of the video screen of the transparent portion 22b in the OSD screen can be made lower than that of the non-transparent portion 22a in the OSD screen. When character information or the like is displayed on the transparent portion 22a, the information can be more easily viewed. In the case of a television, the blend value sent from the external CPU 14 or the like is sent along with a transmission signal from a broadcasting station. These external CPs
If it is difficult for the receiving side to see the blending value γ sent from the transmitting side from U14 or the like, or if it is desired to adjust the OSD screen transparent part independently of the transmitting side, the blending value is also used on the receiving side. Of course, it may be configured such that γ can be adjusted independently.

<Embodiment 2> FIG. 3 is a block diagram showing another embodiment of the image processing and display apparatus according to the present invention, in which a plurality of OSD images are simultaneously displayed. here,
An example in which two types of OSD images (OSD image 0 and OSD image 1) are simultaneously displayed will be described. When the OSD image 0 and the OSD image 1 overlap, the OSD image 0
Is displayed above.

As shown in FIG. 3, the image processing and display apparatus of this embodiment has at least an external storage unit 30 and a CPU 34.
And an OSD control unit 300. The external storage unit 30 stores moving image data (video data) to be displayed and data of two types of OSD images (OSD data) to be superimposed and displayed thereon. The CPU 34 calculates the blend parameters α0, β0, γ0 of the OSD image 0,
The blend parameters α1, β1, and γ1 of the image 1 are output. Here, α1 is a blend value of the OSD image 1,
β1 is a blend value applied to the video image on which the OSD image 1 overlaps, and γ1 is a blend value applied to the video image in the transparent area (transparent area). The range of each value is 0 ≦ α1 ≦ 1, 0 ≦ β1 ≦ 1, 0 ≦ γ1
≦ 1. Α0 is a blend value for the OSD image 0, β0 is a blend value for the video image on which the OSD image 0 overlaps, and γ0 is a blend value for the video image on which the OSD image 0 overlaps in the transparent area. The range of each value is 0 ≦ α0 ≦ 1, 0 ≦ β0 ≦ 1, 0 ≦ γ
0 ≦ 1. The OSD control unit 300 includes the memory control unit 3
1, two OSD data buffers 32, 313, two palette reference units 33, 314, CPU interface 3
5, mode register 36, two mode selectors 37, 3
15, multipliers 310, 311, 318, 319 and adders 312, 320.

The OSD control unit 300 thus configured
Works as follows. The blend parameters α0, β0, γ0 for the OSD image 0 sent from the external CPU 34 or the like via the CPU interface 35 and the OSD image
The blend parameters α1, β1, and γ1 for the image 1 are written into the mode register 36.

The memory control section 31 reads out the OSD data of the OSD image 1 from the external storage section 30 before the display start timing of the OSD image 1. The read OSD data is written to the OSD data buffer 32. The pallet reference unit 33 reads out the OSD data from the OSD data buffer 32 when the display start timing of the OSD image 1 comes, and the color information (palette) indicated by the color information number.
To the multiplier 310. That is, the pallet reference unit 33
Stores a color information data table corresponding to the color information number, and outputs color information data corresponding to the color information number of the read OSD data.

In this embodiment, first, a blending process of the OSD image 1 and the video image is performed. Memory control unit 31
Reads the video data from the external storage unit 30 and sends it to the multiplier 311 in accordance with the display timing of the video image.

The mode selection unit 37 includes a mode register 36
Blend parameters α1, β1, γ of OSD image 1 inside
1 is switched to an OSD blend value output 38 and a video blend value output 39 in accordance with the scanning position of the screen being displayed.

FIG. 4B shows the relationship between the screen scanning position and the output of the mode selection unit 37. The operation is equivalent to FIG. 2B shown in the first embodiment. The multiplier 310 is provided with the color information data of the palette reference section 33 and the OSD of the mode selection section 37.
Multiplication with the blend value output 38 is performed. The result of this multiplication is
5 shows the components of the OSD image 1 on the display screen. On the other hand, the multiplier 311 multiplies the video data by the video blend value output 39 of the mode selector 37. The result of the multiplication represents a video image component on the display screen. Multiplier 3
The respective multiplication results of 10 and 311 are added by an adder 312. Thus, the blending processing of the OSD image 1 and the video image is completed.

Next, the result of the blending process of the OSD image 1 and the video image and the blending process of the OSD image 0 are performed. Before the display start timing of the OSD image 0, the memory control unit 31
The SD data is read from the external storage unit 30. The read OSD data is written to the OSD data buffer 313. When the display start timing of the OSD image comes, the palette reference unit 314 sends the OSD buffer 313
The D data is read, and the color information (palette) indicated by the color information number is sent to the multiplier 318. That is, the pallet reference section 314 stores a color information data table corresponding to the color information number, and outputs color information data corresponding to the color information number of the read OSD data.

The mode selection unit 315 includes a mode register 3
6, blend parameters α0, β0,
An operation is performed such that γ0 is switched and output between the OSD blend value output 316 and the video blend value output 317 in accordance with the scanning position of the screen being displayed.

FIG. 4C shows the relationship between the screen scanning position and the output of the mode selection unit 315. The operation is equivalent to FIG. 2B shown in the first embodiment. The multiplier 318 multiplies the color information data of the palette reference unit 314 by the OSD blend value output 316 of the mode selection unit 315. The result of the multiplication represents a component of the OSD image 0 on the display screen.
On the other hand, the multiplier 319 multiplies the output of the adder 312, which is a blended image of the OSD image 1 and the video image, by the video blend value 317 of the mode selection unit 315.
The multiplication result of each of the multipliers 318 and 319 is
The result is added at 20 and output. With the above, two types of OSD
The blending processing of the image and the video image ends.

FIG. 4A shows the relationship between the video screen 40, the OSD screen 0, the OSD screen 1, and the blend parameters of each display area as an example of the display screen in this embodiment. The display result is the non-transparent portion 42a in the OSD screen 0,
OSD screen 0 transparent section 42b, OSD screen 1 non-transparent section 44a, OSD screen 1 transparent section 44b, video screen section 4
2c. In this embodiment, first, the OSD
After blending screen 1 and video screen 40,
An operation is performed to blend the result with the OSD screen 0. That is, the display priority order of the overlapping portion is OSD screen 0, OSD screen 1, and video screen 40 in this order. Here, when the color information of each OSD pixel in the OSD screens 0 and 1 is represented by “osd0” and “osd1”, and the color information of the video pixel is represented by “video”, for example, the transparent area of the OSD screen 0 and the OSD screen 1 overlaps the transparent area of the OSD screen and the video screen, that is, the OSD screen transparent area overlapping area 46 includes the transparent section 44b in the OSD screen 1 and the video screen 4
The calculation of the overlapping portion with 0 is γ1 × “video”, which is processed as the transparent portion 42b of the OSD screen 0, and the calculation result is γ0 × (γ1 × “video”).

In this embodiment, a case where two types of OSD images are blended with a video image has been described. However, when two or more types of OSD images are blended with a video image, it can be easily analogized.

As described above, even if there are a plurality of OSD images, the OSD images are prioritized, the OSD image having the lowest priority is synthesized with the video image, and the result is used as a new video image. Iteratively, such as combining with the next OSD image, the blend value γ of each OSD screen
By setting 0, γ1,... To appropriate values, each OS
The display brightness of the video screen in the transparent part in the D screen can be made lower than the non-transparent part in each OSD screen.
When character information or the like is displayed on a non-transparent portion in the screen, the information can be more easily viewed.

In the case of a television, the blend value sent from the external CPU 34 or the like is sent along with a transmission signal from a broadcast station. If it is difficult for the receiving side to recognize the magnitude of the blend value sent from the transmitting side from the external CPU 34 or the like, or if it is desired to adjust the OSD screen transparent portion independently of the transmitting side, the blending is performed on the receiving side. Needless to say, the configuration may be such that the value can be adjusted independently.

<Embodiment 3> FIG. 5 is a block diagram showing still another embodiment of the image processing and display apparatus according to the present invention.
In the present embodiment, a blend parameter is provided in a portion other than the OSD image display area so that it can be controlled. As shown in FIG. 5, the image processing and display apparatus according to the present embodiment includes at least an external storage unit 10, a CPU 14, an OSD
And a control unit 500. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. That is, in the present embodiment, the OSD control unit 500
The mode register 56 and the mode selection unit 57 in the first embodiment are different from the OSD control unit 100 of the first embodiment.

The mode register 56 has a blend value α,
In addition to β and γ, the blend value δ (0
≤ δ ≤ 1). Here, FIG. 6B shows an operation table of the mode selection unit 57 in the present embodiment. In the mode selecting section 57, O is set according to the scanning position of the screen being displayed.
If it is in the SD screen, the blend values α, β, and γ of the mode register 56 are switched between the OSD blend value output 18 and the video blend value output 59 and output as in the first embodiment. When the screen scanning position is located outside the OSD image display area, unlike the first embodiment, the mode selection unit 57 outputs the blend value δ to the video blend value output 59.

FIG. 6A shows the relationship between the video screen 60, the OSD screen 62, and the blend parameters of each display area as an example of the display screen in this embodiment. The difference from FIG. 2A shown in the first embodiment is that a gain represented by a blend value δ is applied to the OSD screen non-display area 62c, so that δ × “video” is obtained.

With this configuration, it is possible to reduce the display brightness of the video image area other than the control information such as characters and graphics displayed on the non-transparent portion 62a in the OSD screen to make it easier to see, and to reduce the display brightness. By making the display brightness of the transparent portion 62b and the display area 62a outside the OSD screen approximately the same, it becomes possible to make the boundary between the video screen and the OSD screen inconspicuous.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the spirit of the present invention. It is.

[0051]

As is apparent from the above-described embodiment, according to the image processing and display apparatus of the present invention, when the OSD screen is multiplexed on the video screen and displayed, the transparent portion in the OSD screen is displayed on the video screen. By having a parameter capable of controlling color information, information such as characters and figures displayed in a non-transparent area in the OSD screen can be more easily viewed.

Further, the video screen in the display area outside the OSD screen is configured to have parameters for controlling the color information, so that information such as characters and figures displayed in the non-transparent area in the OSD screen can be obtained. Not only can be more easily seen, but also the boundary between the video screen and the OSD screen can be made inconspicuous by making the display brightness between the transparent portion inside the OSD screen and the display area outside the OSD screen approximately the same.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an image processing and display apparatus according to the present invention.

FIG. 2A is a diagram showing a relationship between a video screen, an OSD screen, and a blend parameter as an example of a display screen of the image processing display device shown in FIG. 1, and FIG. It is a figure showing a table.

FIG. 3 is a block diagram showing another embodiment of the image processing display device according to the present invention.

4A shows a video screen, two OSD screens as examples of a display screen, and FIG.
FIG. 3B is a diagram illustrating a relationship with a blend parameter, FIG. 3B is a diagram illustrating an operation table of a mode selection unit 1, and FIG. 3C is a diagram illustrating an operation table of a mode selection unit 0.

FIG. 5 is a block diagram showing still another embodiment of the image processing / display apparatus according to the present invention.

6A is a diagram showing a relationship between a video screen, an OSD screen, and a blend parameter as an example of a display screen, and FIG. 6B is an operation of a mode selection unit in the image processing display device shown in FIG. It is a figure showing a table.

FIG. 7 is a block diagram showing a conventional example of an image processing display device.

8 is a diagram illustrating the conventional image processing and display device shown in FIG.
(A) is a diagram showing a relationship between a video screen, an OSD screen, and a blend parameter as an example of a display screen, and (b) is a diagram showing a relationship between a screen scanning position and a blend parameter.

[Explanation of symbols]

10, 30, 70 ... external storage unit, 11, 31, 71 ... memory control unit, 12, 32, 72, 313 ... OSD data buffer, 13, 33, 73, 314 ... palette reference unit, 14, 34, 74 ... CPU, 15, 35, 75 ... C
PU interface, 16, 36, 56 mode register, 76 register, 17, 37, 57, 315 mode selector, 18, 38 OSD blend value output, 19,
39: video blend value output, 77: OSD blend selector, 78: subtractor, 79: video blend selector, 1
00, 300, 500... OSD control unit, 110, 111
... Multipliers, 112, 312, 320 ... Adders, 310,
311, 318, 319 multiplier, 316 ... OSD blend value output, 317 ... video blend value output, 700 ...
OSD controller, 712... Adders, α, β, γ, δ... Blend values.

Claims (3)

[Claims] 1. An on-screen display image (OSD) by an on-screen display function for superimposing and displaying control information or service information such as characters and graphics on an image frame (video image) of a television, VTR or the like.
Image) is multiplexed on the video image and displayed.
OSD image in the OSD image display area to control the blending function that allows the video image to be seen through from below the image and the function that allows the user to specify the transparent area where the video image is displayed through in the position of the OSD image And a second parameter for controlling the video image in the OSD image display area.
In the image processing display device provided with the SD control unit,
An image processing display device, further comprising a third parameter for controlling a video image in a transparent area in the SD control unit. 2. A plurality of on-screen display images (OSD images) at the same time by an on-screen display function for displaying control information or service information such as characters and graphics on an image frame (video image) of a television, VTR or the like. When displaying a video image multiplexed on a video image, a blending function that allows the video image to be seen through from below each OSD image, and a transparent area where the video image is displayed through at the position of each OSD image can be specified. A first parameter for controlling an OSD image in each OSD image display area,
An image processing display device comprising an OSD control unit having a second parameter for controlling a video image in a D image display area, wherein the OSD control unit further includes a third parameter for controlling a video image in each transparent area. , The plurality of OSDs
Prioritize the images and the OSD with the lowest priority
An image processing and display apparatus, wherein the OSD control unit is configured to synthesize an image with a video image, and to repeat the synthesis of the result as a new video image with a next OSD image. 3. The image processing and display device according to claim 1, wherein a fourth parameter for controlling a video image outside an OSD image display area is further provided in the OSD control unit.