KR19990046873A - HDIVE's Multi-screen Generator - Google Patents

Abstract

The present invention relates to a multi-screen generator of a high definition television (HDTV), comprising: a sync detector configured to receive a sync signal and detect a vertical sync signal, and to generate an address and timing corresponding to a position of the multi-screen selected according to a detection result of the sync detector; A sub-screen output unit for storing a plurality of input image data of a plurality of input screens and controlling the control unit according to a detection result of the synchronization detector; and a multi-screen output unit outputted from the sub-screen output unit. It consists of an image output unit for storing the image data at the address generated by the controller at the same time and outputting the images of one screen at the same frame rate. Different types of digital TVs with natural display according to rate Having a size and a frame rate has the effect of generating a variety of multiple screens according to an input image.

Description

HDIVE'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 apparatus for generating a multiple screen of an image having various kinds of sizes and frame rates according to the US Advanced Television System Committee (ATSC) 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 possible to process images with various resolutions 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 be changed at various times with various input formats and various frame rates 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 illustrating a configuration of an NTSC multi-screen generator as an embodiment according to the prior art, and FIG. 2 is a diagram for describing a configuration of the NTSC multi-screen generator as another embodiment according to the prior art. The block diagram is as follows.

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.

Such a multi-screen generator of the prior art can be applied to a system having the same image format or frame rate, but an image that changes every time when an image inputted on the same channel is applied to a digital TV having an image format and frame rate having various resolutions. A problem arises in that the size of the displayed image cannot be adjusted according to the format and the frame rate.

That is, as shown in FIG. 3, when an input image A having a frame rate of 24 Hz is displayed and an image having a frame rate of 60 Hz is input, the display speed is increased, and an overlap with the preceding character occurs on the upper portion of the next B character to be displayed. .

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

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and prevents distortion of the screen due to overlapping screens according to an image of an input video format having various kinds of sizes and frame rates of a digital TV. The purpose of the present invention is to provide a multi-screen display of HDTV.

A feature of the multi-screen display device of the HDTV according to the present invention is to temporarily store a plurality of multi-screen video data and write the main memory at the same frame rate after writing to the main memory according to the window position selected in the vertical synchronization signal section without the image data To read and display.

1 is a block diagram for explaining a configuration of an NTSC multi-screen generator as an embodiment according to the prior art;

2 is a block diagram illustrating a configuration of an NTSC multi-screen generator according to another embodiment according to the related art.

3 is a block diagram illustrating the occurrence of character overlap according to the prior art.

4 is a block diagram schematically illustrating a configuration of a multi-screen generator of an HDTV according to the present invention.

5 is a block diagram illustrating a configuration of a multi-screen generator of an HDTV according to an embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of a main memory and a sub picture memory unit of the image memory unit of FIG. 5; FIG.

FIG. 7 is a block diagram illustrating a data movement section of a sub picture memory unit for a display vertical synchronization signal in FIG. 5. FIG.

FIG. 8 is a timing diagram illustrating movement timings of image data of the display vertical synchronization signal and the sub-screen memory of FIG. 6.

9A and 9B illustrate an embodiment of a multi-PIP 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: PIP window selection unit 104: PIP 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 unit 115: block address generator

116: sub picture memory unit 117: video memory unit

Prior to describing the present invention, in order to solve the problem that the size of the displayed image cannot be changed as the input format of the image input to the same channel in the digital TV is changed from time to time, the multi-screen display device of the HDTV ( Patent Application No. 97-42185 has been filed.

The multi-screen display device (Patent Application No. 97-42185) of the HDTV detects the format change and the change of the multi-screen selection signal detected by the format detection unit by receiving format information and detecting the format of the format. A conversion detection unit, an image reduction unit for reducing input image data according to a format detected by the format detection unit, a background image data generation unit for generating data corresponding to a background screen color, and an output of the conversion detection unit The display unit is configured to display and display data on the screen by reading and reading data output from the background screen data generator or the image reduction unit.

That is, when the format change unit detects the change in the format and the change in the multi-screen selection signal through the format detection unit, the image reduction unit reduces the input image data according to the format of the format detected by the format detection unit, and the background image data generation unit Generates data corresponding to the background screen color.

Thereafter, the data output from the background screen data generator or the image reduction unit is written and read on the selected multiple screens of the conversion detector and displayed on the screen.

That is, various types of multi-screens are generated according to the format change of the input image.

The present invention is to generate a stable multi-screen without overlapping the image even when the frame rate (rate) of the input image based on the multi-screen display device (Patent Application No. 97-42185) of the HDTV filed as follows .

First, referring to the multi-screen display of the HDTV according to the present invention, as shown in FIG. 4, a synchronization detector that receives a synchronization signal and detects a vertical synchronization signal, and a position corresponding to the position of the multiple screen selected according to the detection result of the synchronization detector are shown in FIG. 4. A control unit for controlling address generation and timing, a sub-screen output unit for storing a plurality of input image data and outputting the multi-screen image data to the control of the control unit according to the detection result of the synchronization detector; And an image output unit which outputs the image data of the multi-screen output to the address generated by the controller in the image memory and outputs the images of one screen at the same frame rate.

Here, the image memory is composed of a main memory and a sub-screen memory as shown in FIG. 6, and the sub-screen memory temporarily stores a reduced image at the sub-screen output unit, and a portion suitable for the repetition period of the vertical synchronization signal of the display is stored in the main memory. Transferred.

The number of sub-screen memories is determined by the number of moving images processed by the multi-screen window.

That is, the present invention performs a natural display according to various frame rates by writing to the main memory in a vertical synchronization signal section without image data and then reading and displaying the same frame rate.

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

FIG. 5 is a block diagram illustrating a configuration of a multi-screen generator of an HDTV according to an embodiment of the present invention. The multi-screen display apparatus according to the present invention receives format information and detects a format of a format. ), A format conversion detection unit 102 for detecting whether the format of the format detected by the format detection unit 101 is converted, a PIP window selection unit 103 for selecting a PIP window by an external PIP window selection signal, and A PIP window conversion detector 104 for detecting whether the PIP window selection signal detected by the PIP window selection unit 103 is converted, and a format conversion signal output from the format conversion detection unit 102 and the PIP window conversion detection unit 104. Or OR gate 105 for logical sum of the PIP window conversion signals, a size correction unit 106 for cutting out the boundary of the input image, and a size number according to the format detected by the format detection unit 101. A first switch 113 for selecting and outputting an image corresponding to the size modified by the controller 106 or outputting the input image as it is, and generating wallpaper data for generating data corresponding to a background screen color during display The unit 107, the image reduction unit 108 for reducing the image selected and output by the first switch unit 113 to be displayed, and the background data generation unit 107 according to the output of the OR gate 105. The second switch unit 114 for selecting and outputting the data output from the data or the image reduction unit 108 and the window selection signal are input to the selected PIP part through the second switch unit 114. The write address generator 109 includes a write address generator 109 for generating a corresponding write address for writing the compressed image, and a main memory 111 and a sub-screen memory 116. The image memory unit 117 temporarily stores the image output from the second switch unit 114 at the generated address in the sub-screen memory unit 116 and stores the image in the main memory unit 111 according to the block address. And a block address generator 115 for reading the contents of the sub-screen memory 116 of the video memory 117 in the display vertical synchronization signal repetition period and generating a block address for writing to the main memory 111; A read address generator 110 for generating an address for reading image data stored in the main memory 111 of the image memory 117 so as to be periodically displayed at a predetermined frame rate in accordance with the synchronization signal; And a display processor 112 that performs additional image processing so that the user can easily view the image data output from the unit 117.

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.

FIG. 6 is a block diagram illustrating a configuration of a main memory and a sub-screen memory unit of the image memory unit of FIG. 5, and FIG. 7 illustrates a data movement section of a sub-screen memory unit for a display vertical synchronization signal in FIG. 5. 8 is a timing diagram illustrating the timing of movement of the display vertical synchronization signal of FIG. 6 and the image data of the sub picture memory unit.

In the U.S. GA (Grand Alliance) standard, the digital TV standard allows various types of video formats. Therefore, the digital TV receiver has various video formats such as 24 kHz, 30 kHz, 60 kHz, progressive scan, interlaced scan, etc. The frame rate image must be processed.

In addition, it should be able to process images of various sizes having a resolution of 240 × 640, 480 × 704, 720 × 1280, 1080 × 1920.

These various frame rates and video format information are mixed with image data in the input video bitstream and vary with the program in the same channel.

First, the format detection unit 101 receives image format information from a bitstream to detect a format type of an image, and the size correction unit 106 receives an 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.

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, an image format input from one channel may be changed according to time, and an image having a 16: 9 aspect ratio may be input, followed by an image having a 4: 3 aspect ratio.

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.

That is, when the detection signal is generated by the format conversion detection unit 102 or the PIP window conversion detection unit 104, the background image data generation unit 107 adjusts the second switch unit 114 to adjust the background image data. In addition, the address is generated to be applied to the block address generator 115 so as to apply the background screen data to the entire area of the multi-screen window being selected regardless of the type of the input format.

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 and output, the write address generator 109 generates an address and writes the reduced image to the sub-screen memory unit 116 of the image memory unit 117.

Thereafter, the block address generator 115 reads data written to the sub-screen memory unit 116 of the image memory unit 117 during the display synchronization signal, in particular, the display vertical synchronization signal recovery period as shown in FIG. Generate an address for writing to the selected window.

Here, the image memory unit 117 is configured as shown in FIG. 5, and the number of memories of the sub-screen memory unit 116 is determined by the number of moving images processed by the multi-screen window.

The sub-screen memory unit 116 sometimes needs two frames of memory to process one multi-screen video.

If there are video inputs A and B as shown in FIG. 6, as shown in FIG. 8, input A writes in the display section using one memory A and reads the display session section because the sync signal matches the display sync signal. Write to 111.

However, input B can continue to be written to the reduced image during the display vertical sync signal repetition period because the sync signal does not coincide with the display sync signal. In this case, two window size frame memories are required.

That is, when the reduced image is written in the sub-screen memory b, the image already stored in the sub-screen memory B is transferred to the main memory 111 during the synchronization signal resetting period, thereby displaying a complete image.

The block address generator 115 generates an address to write data only to a window selected by the PIP window selector 103 among a plurality of multiple screens because there are several sub-screens in the main image. ) Is written to the main memory 111.

Therefore, in multi-screen display, after dividing the screen into several screens, only a few multi-screens are operated as moving images, and the remaining multi-screens are provided only as still images.

That is, the image which continues the write operation is displayed as a moving picture and the rest is displayed as a still image.

Thereafter, the read address generator 110 generates an address and periodically reads the main memory 111 of the image memory 117. That is, the synchronization signal required for display is received and displayed at the same frame rate.

The display processor 112 performs additional image processing so that a user can easily view the image data output from the main memory 111 by the address generation of the read address generator 110.

9A and 9B, the display processor 112 has a 16: 9 window and a 4: 3 window according to an image format. In this case, a video is displayed only in a specific window and a still image is displayed in other parts.

In this case, if the window representing the video window is displayed with different color or thickness, the user can easily recognize the video window.

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

The multi-screen generating apparatus of the HDTV according to the present invention adjusts the image size in response to the change of the format of the image corresponding to the multi-screen, and displays the display according to various frame rates, thereby having various kinds of sizes and frame rates of the digital TV. There is an effect of generating a variety of multi-screen according to the image.

Claims (5)

A synchronization detector for receiving a synchronization signal and detecting a vertical synchronization signal; A control unit for controlling address generation and timing corresponding to the position of the multi-screen selected according to the detection result of the synchronization detector; A sub-screen output unit which stores a plurality of input image data and outputs the multi-screen image data under control of the controller according to a detection result of the synchronization detector; The video output unit is configured to output the image data of the multiple screens output from the sub-screen output unit at the address generated by the controller at the same time and output the images of one screen at the same frame rate. Multi-screen generator. The method of claim 1, wherein the sync detection unit HHD multi-screen generating apparatus characterized in that it is configured to detect the vertical synchronization signal recovery period. The apparatus of claim 1, wherein the image data of the plurality of multi-screens is image data of a multi-screen corresponding to a video. The apparatus of claim 1, wherein the image data of the plurality of multiple screens is image data of a reduced screen. The display unit of claim 1, wherein the sub-screen output unit It is necessary to have as many memories as the number of videos processed by the multi-screen window, and H-Dive's multi-screen generator is characterized by consisting of two frames for each multi-screen video memory.