KR100239466B1 - Multi-pip generation apparatus in hdtv - Google Patents

Abstract

A multi-screen generating apparatus for a high definition television (HDTV), comprising: a format detecting unit which receives format information and detects a format form, and detects a change in format and a multi-screen selection signal detected by the format detecting unit; A conversion detection unit, an image reduction unit for reducing input image data according to the format detected by the format detection unit, a background screen data generation unit for generating data corresponding to a background screen color, and an output of the conversion detection unit. Accordingly, the display unit is configured to display and display data output from the background screen data generator or the image reduction unit and display the data on the screen, and adjust the size of the image in response to a change in the input format. To delete the video in the window According to the input image having a size and a frame rate of flow has the effect of generating a variety of multiple screens.

Description

HDTV's multi-screen generator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital TV system, and more particularly, to an image multi-screen generator having various kinds of sizes and frame rates according to the GA (Grand Alliance) standard.

The digital TV standard in the United States allows various types of video formats. Therefore, the digital TV receiver must be able to process images of various frame rates such as 24Hz, 30Hz, 60Hz, interlaced and progressive scan images. It should be able to process images of various sizes with resolutions of 240 × 640, 480 × 704, 720 × 1280, and 1080 × 1920.

In digital TV, an input format of an image input to the same channel may vary from time to time in various input formats as described above. Accordingly, the size of the displayed image may change, and the size of the multi-screen window may change.

Therefore, multiple screens should be generated according to the input image having various sizes and frame rates and the multi-screen window position conversion.

Hereinafter, a multi-screen generator according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram for explaining the configuration of the NTSC multi-screen generator according to the prior art, Figure 2 is a block diagram for explaining the configuration of another NTSC multi-screen generator according to the prior art.

The multi-screen generator of FIG. 1 includes an image reduction unit 11, a write address generator 12, a read address generator 13, a frame / field memory unit 14, and a display processor 15. It consists of.

First, the image reduction unit 11 reduces the input image to match the display size and writes the image to an appropriate position of the frame / field memory 14 by using the address provided by the write address generator 12.

The read address generator 13 sequentially reads the image written in the frame / field memory 14 and inputs it to the display processor 15. The display processor 15 makes it easier for the user to view the input image data. Additional image processing is performed.

In addition, the multi-screen generator as shown in FIG. 2 includes a main screen selector 21, first and second sub-screen generators 22 and 23, a PIP processor 24, and a display processor 25. do.

In the multi-screen generator configured as described above, the main screen selector 21 selects a required image from image data input from a tuner (not shown) and provides it to the PIP processor 24.

The first and second sub-screen generators 22 and 23 reduce and store the input image by using a first-in first-out (FIFO) memory to a multi-screen window size and provide the PIP processor 24 when necessary.

By outputting a control signal to the main screen selector 21 and the first and second sub-screen generators 22 and 23 to adjust a necessary image to be input at a required time point, and selectively outputting it to the display processor 25. Provide multiple screens.

That is, when the main screen is displayed, the image provided by the main screen selector 21 is output to the display processor 25, and when the sub screen is displayed, the first and second sub-screen generators 22 and 23 are displayed. ) And outputs a sub screen image by displaying a control signal and selectively displays it to generate a multi screen.

The multi-screen generating apparatus according to the related art has a problem that the size of the displayed image cannot be adjusted when an image having various types of sizes and frame rates is input as an input format like a digital TV.

In addition, there is a problem that can not be adjusted for various multi-screen window size and position conversion.

The present invention has been made to solve the above problems and provides a multi-screen display device of HDTV that can generate a multi-screen of various forms according to the image of the video format having various types of sizes and frame rates of the digital TV. The purpose is.

1 is a block diagram for explaining the configuration of the NTSC multi-screen generating apparatus according to the prior art

2 is a block diagram for explaining the configuration of another NTSC multi-screen generator according to the prior art

3 is a block diagram for explaining the configuration of a multi-screen generating device of the HDTV according to the present invention

4 is a block diagram illustrating a detailed configuration of an image reduction unit of FIG. 2.

5 is a diagram for one embodiment of a multi-screen according to the present invention.

Explanation of symbols for main parts of the drawings

101: format detection unit 102: format conversion detection unit

103: window selection unit 104: window conversion detection unit

105: Oa gate 106: size correction

107: background data generation unit 108: image reduction unit

109: write address generator 110: read address generator

111: field memory section 112: display processing section

113, 114: switch portion 120: vertical filter portion

121: horizontal filter unit 122: reduction unit

Features of the multi-screen display device of the HDTV according to the present invention are a format detector for detecting the format of the format by receiving the format information, and a conversion detector for detecting the change of the format and the change of the multi-screen selection signal detected by the format detector And a background screen data generator for generating data corresponding to the background screen color.

In addition, another feature of the multi-screen display device of the HDTV according to the present invention is to add a size correcting unit for cutting out the boundary portion of the input image data according to the image format detected by the format detector, and outputs it to the image reduction unit.

In addition, another feature of the multi-screen display device of the HDTV according to the present invention is a vertical filter unit for performing vertical filtering of the image data input to the image reduction unit, and the vertically filtered image data from the input image data or the vertical filter unit horizontal And a horizontal filter unit for performing filtering and a reduction unit for subsampling and outputting input image data or image data filtered by the horizontal filter unit.

Hereinafter, a multi-screen display of an HDTV according to the present invention will be described with reference to the accompanying drawings.

3 is a block diagram illustrating a configuration of an apparatus for generating a multi-screen of an HDTV according to the present invention, and FIG. 4 is a block diagram illustrating a detailed configuration of the image reduction unit of FIG. 3.

The multi-screen display device according to the present invention includes a format detection unit 101 for receiving format information and detecting a format type, and a format conversion detection unit 102 for detecting whether the format of the format detected by the format detection unit 101 is converted. And a PIP window selection unit 103 for selecting a PIP window by an external PIP window selection signal, and a PIP window conversion detection unit for detecting whether the PIP window selection signal detected by the PIP window selection unit 103 is converted ( 104, ORA gate 105 that logically combines the format conversion signal and PIP window conversion signal output from format conversion detection unit 102 and PIP window conversion detection unit 104, and the number of sizes to cut out the boundary of the input image. Selecting and outputting the image corresponding to the size modified by the size correction unit 106 or outputting the input image as it is according to the unit 106 and the format detected by the format detection unit 101 The first switch unit 113, the background screen data generator 107 generating data corresponding to the background screen color during display, and the image selected and output by the first switch unit 113 are displayed in the displayed size. And a second switch for selectively outputting the image output from the background data generator 107 or the data processed by the image reduction unit 108 according to the output of the OR gate 105. When the selection signal is input from the unit 114, the PIP window selector 103, the write address generator 109 for generating a write address corresponding to the selected PIP portion, and a field for periodically reading image data. The selected window in the field in which the read address generator 110 generating the read address and the data generated by the second switch 114 to the address generated by the write address generator 109 are output. In order to make it easier for a user to view the image data outputted from the field memory unit 111 and the field memory unit 11 that reads the entire field and reads from the field generated by the read address generator 110. And a display processor 112 for performing additional image processing.

Here, the image reduction unit 108 may include a vertical filter unit 120 performing vertical filtering of image data selectively output from the first switch unit 113, and image data selected and output from the first switch unit 113. Alternatively, the horizontal filter unit 121 performs horizontal filtering on the image data vertically filtered by the vertical filter unit 120 and the image data or the horizontal filter unit 121 filtered by the first switch unit 113. And a reduction unit 122 for subsampling and outputting image data.

The operation of the multi-screen display of the HDTV according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

5 is a diagram for one embodiment of a multi-screen according to the present invention.

There are 18 different video formats for terrestrial broadcasting of digital TV in the US GA (Grand Alliance) standard. This video format information is mixed with image data in the bitstream, and the video format changes according to programs in the same channel.

The format detector 101 receives the image format information from the bitstream, detects the format type of the image, and the size correction unit 106 receives the image and cuts the boundary of the image.

In the case of the specific image format, the size correction unit 106 can easily reduce the amount of hardware and reduce the amount of hardware.

If the image format is to reduce the boundary of the image through the size correction unit 106, the format detection unit 101 controls the first switch unit 113 to reduce the image data output from the size correction unit 106 to the image reduction unit. Output to (108).

On the other hand, if the image format does not need to reduce the boundary of the image through the size correction unit 106, the format detection unit 101 controls the first switch unit 113 to convert the originally input image data to the image reduction unit 108 Make output

According to the image format, the image reduction unit 108 that receives the image data whose size is selected and output through the first switch unit 113 or the originally input image data is displayed according to the format detected by the format detection unit 101. Reduce to fit size.

The image reduction unit 108 performs low pass filtering through the vertical filter unit 120 and the horizontal filter unit 120 before reducing the image according to the format detected by the format detection unit 101.

Hardware is complicated because a large number of line memories are required for vertical filtering of the vertical filter unit 120. In order to implement multi-screen generation with simple hardware, the vertical filter unit 120 may be omitted.

The horizontal filter unit 120 may store the plurality of pixels of the input image data relatively simply and may omit it if it is difficult to implement the filter.

The image data filtered through the vertical filter unit 120 or the horizontal filter unit 121 or the image data that is not vertically filtered or horizontally filtered by the vertical filter unit 120 or the horizontal filter unit 121 may be reduced by performing subsampling in the reduction unit 122.

In addition, the format conversion detection unit 102 continuously checks the image format information output from the format detection unit 101 to detect whether a change in the format of the input image occurs, and when a format change occurs, a signal indicating a change in the format of one frame. Generated and printed during the cycle.

When a signal for selecting a PIP window is input through a microcomputer or a remote controller of the television receiver, the PIP window selector 103 detects a position of a multi-screen and outputs it to the PIP window conversion detector 104 and the display processor 112. .

The PIP window change detector 104 continuously checks the position of the multi-screen output from the PIP window selector 103 and outputs a signal for notifying a change in the inputted multi-screen for a period of one frame.

The OR gate 105 controls the second switch unit 114 by logically combining the signals output from the format conversion detector 102 and the PIP window conversion detector 104.

The background screen data generating unit 107 generates data corresponding to a background screen color during display, and generally stores data corresponding to black and can be changed as necessary.

In the case of digital TV, various types of images are input. As shown in FIG. 4, in the case of an image format input from one channel, the format is changed according to time and an image having a 16: 9 aspect ratio comes in and has a 4: 3 aspect ratio. An image may be input.

In this case, an image having an aspect ratio of 4: 3 is displayed at a smaller size than the aspect ratio of 16: 9 of the previous screen to erase the previous data.

If you do not erase the previous data, the image data of the previous screen remains on the edge of the small 4: 3 screen.

In addition, when the location of the multi-screen is converted, an image having a 16: 9 aspect ratio is stored at the converted position, and when the current image has a 4: 3 aspect ratio, the previous image exists at the edge of the 4: 3 image.

In order to remove the remaining previous image, the output of the OR gate 105 controls the second switch 114 to selectively output the background image data generator 107.

At the same time, the write address generator 109 receiving the output of the OR gate 105 generates an address so that the background screen data generated in the background screen data generator 107 can be applied to the entire area of the multi-screen window.

The second switch 114 selects and outputs the background data generator 107 only for one frame from the output of the OR gate 105 to erase the previous image stored in the field memory 111 and then the image reduction unit ( 108).

When the image reduction unit 108 is selected, the write address generator 109 generates an address to write data only to a window selected by the PIP window selection unit 103 among a plurality of multiple screens, and outputs the image from the image reduction unit 108. The data to be written is written to the field memory section 111 using the address generated by the write address generating section 109.

That is, the multi-screen display divides the screen into several and then operates only a few multi-screens, and the remaining multi-screens provide only still images.

When the image of one field is stored in the field memory unit 111 in this way, the read address generated for periodically reading the data of all the fields from the read address generator 110 is inputted, and the field memory unit 111 receives the entire field. The stored image data of one field is read and output to the display processor 112.

The display processor 112 has a 16: 9 window and a 4: 3 window according to an image format as shown in FIG. 4, where a video only appears in a specific window and a still image is displayed in other portions.

In this case, as shown in FIG. 4, if the window representing the video window is represented by different colors or thicknesses, the user can easily recognize the video window.

In addition, the display processor 112 may add a channel information to each window to perform a function of allowing a user to recognize an image conveniently.

The multi-screen generation apparatus of the HDTV according to the present invention adjusts the image size in response to the change in the input format and generates a background data when the PIP window change is detected, thereby deleting the image in the window. It is effective to generate various multi-screens according to the input image having a rate.

Claims (5)

A format detecting unit which receives the format information and detects the format of the format; A conversion detector for detecting a change in the format of the format detected by the format detector and a change in the multi-screen selection signal; An image reduction unit configured to reduce input image data according to the format of the format detected by the format detection unit; A wallpaper data generator for generating data corresponding to the background screen color; And a display unit configured to write and read data output from the background screen data generator or the image reduction unit according to the output of the conversion detector and display the data on the screen. The apparatus of claim 1, further comprising a size correcting unit which cuts out a boundary of the input image data according to the image format detected by the format detection unit and outputs the image to the image reduction unit. The image reduction unit of claim 1, wherein the image reduction unit A vertical filter unit which vertically filters the input image data; A horizontal filter unit performing horizontal filtering on the input image data or the image data vertically filtered by the vertical filter unit; And a reduction unit configured to subsample and output the input image data or the image data filtered by the horizontal filter unit. The method of claim 1, wherein the display unit And a switch for selectively selecting and outputting data output from the background screen data generator or the image reduction unit according to a logical sum of the format change of the conversion detector and the change of the multi-screen selection signal. Multi-screen generator. The multi-screen of the HDTV according to claim 1 or 4, wherein when the switch selects the background data generation unit, the switch outputs the background data only for one frame and then outputs the data of the image reduction unit. Generator.

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