KR100404218B1 - Video Processing Apparatus for DTV - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital TV, and more particularly, to an image output device of a digital TV for converting a format of an image of a digital TV into an analog image. Such an image output apparatus of a digital TV according to the present invention includes a main screen format conversion unit for converting a format to display an image, a post-processing unit for converting color coordinates of the converted output or improving image quality, and the post-processing. An OSD processing unit for overlaying a data broadcast or a user menu necessary for the captured image, a color coordinate conversion unit for converting the output image of the OSD processing unit to match the display color coordinates, the main screen format conversion unit, a post processing unit, an OSD processing unit, It consists of an input selector which receives the input of the color coordinate conversion unit and provides it to the VCR format converter, reads the image data in the storage unit and provides it to the VCR format conversion unit, and a VCR format conversion unit that formats the image provided by the input selection unit. do.

Description

Video output device of digital TV {Video Processing Apparatus for DTV}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital TV, and more particularly, to an image output device of a digital TV which converts a video screen of a digital TV into an analog image.

Due to the recent introduction of digital TV, it is possible to watch high quality video about 5 to 6 times compared to the existing analog TV, and the sound quality can also be heard at the CD level.

In addition, as a device for storing such digital images, a storage device for digital images is currently being developed, or more time is required to be popularized.

Therefore, even if the digital TV is popularized, it is estimated that the existing analog recording device will be used for the time being, and a function of converting and outputting high-quality digital video into existing NTSC or PAL video is required.

Also, for the time being, due to the expensive display devices, digital TVs are often received using existing analog TVs and set-top boxes. In this case, a function of outputting an existing analog signal as well as a high definition image is essential. It is expected to be used as.

1 is a view showing a conventional image output device of the digital TV.

Referring to FIG. 1, a storage unit 1 for storing a video screen, a main screen format converter 2 for format converting a stored video, a CSC / LUT 4, an OSD / GFX 5, It consists of a VCR format conversion section 3 for converting a VCR video format.

When recording a video of a digital TV using an existing analog recording device, a menu screen overlaid on a high-definition video should not be recorded at the same time. In this case, a screen from which an OSD screen has been deleted should be provided as an existing analog video output.

On the other hand, when watching a digital TV using a set-top box and a conventional analog TV, the user not only selects a menu of the set-top box using a high-definition television but also uses a conventional analog TV. Since the menu can be selected, the OSD screen should be overlaid with the digital video screen and provided as an existing analog TV screen.

In addition, in the case of data broadcasting, image data of RGB color coordinates is input, whereas in the case of MPEG video, YCbCr color coordinates are used, so color coordinate conversion between YCbCr and RGB color coordinates is essential in OSD overlay. It should be possible to output the picture on the VCR screen.

However, when the digital TV image output device configured as described above is connected to an analog TV, it may not be able to provide a post-processing process as well as an OSD screen.

Accordingly, an object of the present invention has been made in view of the above-mentioned problems of the prior art, and the analog TV screen of the main screen image of the digital TV is irrespective of whether the OSD image is overlaid on the main screen or the color coordinates of the displayed image. To provide a video output device of the digital TV to be displayed.

1 is a block diagram showing a conventional image output device of the digital TV

2 is a block diagram showing an image output device of the digital TV according to the present invention

3 is a detailed configuration diagram of an input selector of an image output apparatus of a digital TV according to FIG. 2;

4 is a diagram illustrating an example of selecting a memory image input of an image output apparatus of a digital TV according to FIG. 2;

FIG. 5 is a diagram illustrating an example of post-processing unit image input selection of an image output apparatus of a digital TV according to FIG. 2;

* Description of the symbols for the main parts of the drawings *

10; Main screen format conversion unit 20: post processing unit

30: OSD / GFX 40: CSC

50: storage unit 60: input selection unit

70: VCR format converter

According to a feature of the present invention for achieving the above object, the main screen format conversion unit for converting the format of the image to be displayed, a post-processing unit for converting the color coordinates of the format-converted output or improve the image quality, OSD processing unit for overlaying the data broadcasting or user menu necessary for the post-processed image, color coordinate conversion unit for converting the output image of the OSD processing unit to match the display color coordinates, the main screen format conversion unit, post-processing unit, OSD An input selector that receives input from a processor and a color coordinate converter, and provides the input to a VCR format converter, reads the image data in the storage, and provides the VCR format converter; and a VCR format converter for format converting an image provided by the input selector. It consists of wealth.

Preferably, the input selector includes a FIFO, a sync signal generator, an address generator, and a memory controller.

The address generator provides an address of the stored image data, and provides a corresponding address so that various images can be output in a scanning manner, and the memory controller reads a necessary image using address information supplied from the address generator. The corresponding address is provided to the memory for output, and the image data read from the storage unit is stored in the FIFO, and then the image is output in accordance with the scan type and time provided by the synchronization signal generator. The synchronization signal is generated in accordance with the video signal provided by.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing an image output apparatus of the digital TV according to the present invention, Figure 3 is a detailed configuration diagram of the input selection unit of the digital TV image output apparatus according to the present invention.

First, referring to FIG. 2, the main picture format converting unit 10 is used to display analog broadcast signals such as NTSC and PAL, PC signals such as VGA and XGA, and MPEG images of various sizes used in DTV. It converts to the resolution of the display device.

In addition, appropriate filtering is performed according to the resolution of the input image and the resolution of the output image, and conversion of the interlaced scan type image into a sequential scan type is performed as necessary.

Since most images are in YCbCr format, format conversion in YCbCr format can be performed. However, for PC input, format conversion can be done in RGB format. To reduce memory usage, format conversion can be performed by converting to YCbCr format.

In addition, the post-processor 20 may adjust brightness, contrast, tint, and sharpness to match the color characteristics of the display device in the image converted to the resolution of the display device. It is in charge of coordinating the work.

In addition, if necessary, image processing functions such as noise reduction and filtering are performed, and if the color coordinates of the OSD image are different from the color coordinates of the main image, the color coordinates of the main image are made to match the color coordinates of the OSD image. It converts coordinates.

The OSD / GFX 30 overlays the necessary image on the post-processed image. In the existing analog TV, it is used to display the volume control, time reservation, and channel information of a voice signal, and to display simple characters or figures.

However, with the development of digital TV, the existing characters and figures have also changed very colorfully. Due to the introduction of data broadcasting, a wide variety of image information is input into a broadcasting channel and a function of displaying them is performed.

In the case of data broadcasting, additional information is provided according to content information of a video currently being broadcast, and various types of text information and GIF, PNG, and MNG type still images are provided.

In addition, by overlaying and displaying the phenomenon on the main screen according to the user's request, the user can be provided with various types of services that are not possible in the existing analog broadcasting.

While GIF images are compressed based on YCbCr color coordinates, PNG and MNG image formats are based on RGB color coordinates. If the video and video data overlaid using the OSD have the same color coordinates, there is no problem in performing the overlay function using the OSD. Otherwise, it is necessary to consider this.

For example, assuming that the input video is a PC screen, the image processed with RGB color coordinates, and the image overlaid on the OSD has the GIF format because it has the GIF format, the overlayed OSD image is converted to the RGB color coordinates. Or convert the PC image to YCbCr color coordinates and then overlay it.

To this end, the color coordinate conversion function for the image overlaid on the OSD by the OSD processing unit is required. Otherwise, the color coordinate conversion function is required in the post-processing as described above.

The color coordinates of the image overlaid with the OSD and the color coordinates of the final display device may not coincide. For this purpose, a separate color coordinate conversion device is required at the final stage.

Each of the blocks described above not only performs various functions on the input image by outputting its own functions, but also has a function of passing through the input image without any processing. Optionally used.

In addition, the VCR format converter 70 converts various types of image data processed in the size of the main screen to match the existing analog VCR format.

In addition, it converts the image data of various sizes stored in the memory to fit the analog VCR format.

The input selector 60 provides one of several types of images input by a scanning method as an output or reads data stored in the storage unit 50, converts the data into a scanning method, and provides the output.

Referring to FIG. 3, the input selector 50 will be described. A FIFO 61 for converting data stored in the storage 50 into a scanning method, a synchronization signal generator 62, and an address generator 64, the memory control unit 63.

The address generator 64 is a part for providing an address of the image data existing in the storage unit 50 so that images existing in various forms such as MPEG video, PC video, and NTSC video can be output in a scanning manner. Provide the address.

In addition, the memory controller 63 provides a corresponding address and a memory control signal so that a necessary image can be read from the storage unit 50 using the address information supplied from the address generator 64.

The image data read from the storage unit 50 is stored in the FIFO 61 and then outputs the image in accordance with the scan type and time provided by the synchronization signal generator 62. The synchronization signal generator 62 After generating a synchronization signal in accordance with the video signal provided from the FIFO (61), it is provided to the mux unit (65).

The mux unit 65 selects one of several types of images and outputs the same to the VCR format conversion unit 70 and outputs various images to the VCR.

4 is a diagram illustrating an example of selecting a memory image input of the image output apparatus of the digital TV according to FIG. 2.

As shown in a of FIG. 4, when the image in the storage unit 50 is read out and output to the VCR format converting unit 70, two types of display are possible as shown in b.

That is, when the same content as the memory used by the main picture format converter 10 is provided to the VCR format converter 70, the same screen as the video of the main picture format converter 10 is output to the VCR screen.

In another case, when a video having a different content from the memory used by the main screen format converter 10 is read from the memory and applied to the VCR format converter 70, a video different from the video of the main screen is output to the VCR screen. You can do it. By using this, the user can watch and output specific content on the main screen and output other content on the VCR screen.

Accordingly, when the image data is read from the storage unit 50 and applied to the VCR format converter 70, the display resolution may be different from that of the main screen and the VCR screen, and the OSD image is not loaded on the VCR screen.

FIG. 5 is a diagram illustrating an example of post-processing unit image input selection of an image output apparatus of a digital TV according to FIG. 2.

Referring to FIG. 5, when the output of the post-processing unit 20 is provided to the VCR format conversion unit 70 as shown in FIG. 5A, only a video having the same content as the main screen is converted into a different size and provided as a VCR screen. However, the OSD image is not displayed on the VCR screen regardless of the presence or absence of the OSD menu on the main screen.

When an image of which brightness, contrast, etc. are not adjusted is applied to the VCR screen, an output of the main screen format converter 10 is provided as an input of the VCR screen format converter 70.

In addition, when the OSD image overlaid on the main screen is to be applied to the VCR screen, it is applied to the main screen format converting unit 10, and the color coordinates of the image processed by the main screen format converting unit 10 are VCR screen formats. If the color coordinates processed by the conversion unit 70 are different, the color coordinate conversion is performed using the color coordinate format conversion unit and then the image is applied to the VCR screen format conversion unit.

As described above, according to the present invention, by applying image data having various forms to the VCR screen format conversion unit selectively using a mux, the main screen image is displayed regardless of the size of the main screen image and the color coordinates of the main screen image. It has the effect of outputting the image without the OSD and outputting the image without the OSD to the VCR screen and, if necessary, outputting the OSD screen displayed on the main screen to the VCR screen.

In addition, it is possible to output a video that is completely different from the main screen video to the VCR screen, and has the advantage of recording the video of the channel that is not currently watching on the VCR screen.

In addition to providing a means for receiving digital TVs using analog TVs or VCRs, such as NTSC, PAL, SECAM, etc., which are widely used, digital TV viewers can output analog signals in a wide variety of forms. This has the advantage of increasing the utilization of analog TV or VCR.

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 examples, but should be defined by the claims.

Claims (3)

A main screen format conversion unit for converting a format of the image to be displayed; A post processor for converting color coordinates of the format-converted output or improving image quality; An OSD processor which overlays a data broadcast or a user menu necessary for the post-processed image; A color coordinate converting unit converting an output image of the OSD processing unit to match a display color coordinate; An input selection unit which receives inputs of the main picture format conversion unit, the post processing unit, the OSD processing unit, and the color coordinate conversion unit and provides them to the VCR format converter, and reads the image data in the storage unit and provides them to the VCR format conversion unit; And a VCR format converter configured to format convert an image provided by the input selector. The method of claim 1, And the input selector comprises a FIFO, a synchronization signal generator, an address generator, and a memory controller. The method of claim 2, The address generator provides an address of the stored image data, and provides a corresponding address so that various images can be output in a scanning manner, and the memory controller can read a necessary image using address information supplied from the address generator. The address is provided, and the image data read from the storage unit is stored in the FIFO, and then the image is output in accordance with the scan type and time provided by the synchronization signal generator, and the synchronization signal generator outputs the image. A video output device for a digital TV, characterized in that to generate a synchronization signal in accordance with the signal.