KR20020052708A - A video display processor in digital broadcasting receiver system with reduced internal memory - Google Patents

Abstract

The present invention relates to a communication chip and an image processing technology, and more particularly, to a video display processor of a digital broadcast reception system, and an object thereof is to provide a video display processor of a digital broadcast reception system capable of reducing chip area by reducing internal memory. have. The present invention provides a video display processor of a digital broadcast receiving system, comprising: buffering means for buffering image data input from an external memory; A line memory for updating and storing line data input from said buffering means and intermediate data input from vertical filtering / interpolation means; The vertical filtering / interpolation means for vertically filtering and interpolating the line data stored in the line memory to generate intermediate data; And horizontal filtering / interpolation means for horizontally filtering and interpolating intermediate data input from the vertical filtering / interpolation means and previous intermediate data stored in the line memory to output the output image data.

Description

A video display processor in digital broadcasting receiver system with reduced internal memory}

TECHNICAL FIELD The present invention relates to a communication chip and an image processing technology, and more particularly to a video display processor of a digital broadcast receiving system.

In the video display processor (VDP) of the digital broadcasting reception system, a filtering and interpolation block is required due to the difference between the input image and the output image, and a large memory is provided therein to minimize external memory access. Image data will be saved.

1 is a block diagram illustrating a video display processor according to the related art, and illustrates a VDP having a 5-tap vertical filter and an x-tap horizontal filter.

The conventional VDP includes a buffer 10 for buffering input image data input from an external memory, a line memory 11 having a 5-line size for supporting a 5-tap vertical filter, and a line memory as shown. A vertical filter / interpolator 12 for vertically filtering and interpolating the output of (11) to generate intermediate data, and a line memory of a 2-line size for storing intermediate data output from the vertical filter / interpolator 12 And a horizontal filter / interpolator 14 for horizontally filtering and interpolating the output of the line memory 12 to output the output image data.

Here, the buffer 10 and the two line memories 11 and 13 use RAM, and since digital broadcasting has an HD (high definition) input image, even if the buffer RAM is excluded, 40320 bytes ( The calculation of 40320 bytes is the result of multiplying the number of line memories by seven and the horizontal size 1920 of the HD image and the color component 3 (7 × 1920 × 3). Large internal memory increases the chip area.

The present invention has been proposed to solve the above problems of the prior art, and an object of the present invention is to provide a video display processor of a digital broadcast receiving system which can reduce chip area by reducing internal memory.

1 is a block diagram of a video display processor according to the prior art.

2 is a block diagram of a video display processor according to an embodiment of the present invention.

3 is an exemplary data flow diagram according to the configuration of FIG. 2.

* Explanation of symbols for the main parts of the drawings

20: buffer

21: line memory

22: vertical filter / interpolator

23: horizontal filter / interpolator

According to an aspect of the present invention, there is provided a video display processor of a digital broadcasting reception system, comprising: buffering means for buffering image data input from an external memory; A line memory for updating and storing line data input from said buffering means and intermediate data input from vertical filtering / interpolation means; The vertical filtering / interpolation means for vertically filtering and interpolating the line data stored in the line memory to generate intermediate data; And horizontal filtering / interpolation means for horizontally filtering and interpolating intermediate data input from the vertical filtering / interpolation means and previous intermediate data stored in the line memory to output the output image data.

Preferably, the vertical filtering / interpolation means comprises a 5-tap vertical filter, and uses 5 lines of RAM as the line memory.

Hereinafter, preferred embodiments of the present invention will be introduced in order to enable those skilled in the art to more easily carry out the present invention.

2 is a block diagram of a video display processor according to an exemplary embodiment of the present invention, which illustrates a VDP having a 5-tap vertical filter and an x-tap horizontal filter.

The VDP according to the present embodiment includes a buffer 20 for buffering input image data (line data) input from an external memory, and line data input from the buffer 20 and input from the vertical filter / interpolator 22. A 5-line line memory 21 for storing intermediate data, a vertical filter / interpolator 22 for generating intermediate data by vertically filtering and interpolating the line data stored in the line memory 21, and a vertical filter And a horizontal filter / interpolator 23 for horizontally filtering and interpolating the intermediate data generated by the interpolator 12 and the previous intermediate data stored in the line memory 21 to output the output image data.

3 is a diagram illustrating a data flow according to the configuration of FIG. 2, and the operation of the VDP according to the present embodiment will be described with reference to the following.

In the initial state, the line memory 21 stores y-1, y, 1 + 1, y + 2, and y + 3, and the current state includes the line data y-1, y, 1 + 1, y + 2, The intermediate data Z generated by y + 3 via the vertical filter / interpolator 22 and the line data y, 1 + 1, y + 2 and y + 3 are stored in the line memory 21.

Now, the final output image data should be generated by performing horizontal filtering and interpolation using the intermediate data Z + 1 and Z. Since the intermediate data Z + 1 has not yet been generated, the vertical filter / interpolator 22 A portion of the next line data y + 4 is read from the buffer 20 and vertically filtered using this data and the line data y, 1 + 1, y + 2, y + 3 previously stored in the line memory 21. And interpolation to generate intermediate data Z + 1 and overwrite line data y which is no longer needed.

Meanwhile, the horizontal filter / interpolator 23 performs horizontal filtering and interpolation using the intermediate data Z stored in the line memory 21 and the intermediate data Z + 1 generated by the vertical filter / interpolator 22. Output the final output image data.

While performing the above process, the line data y + 4 written in the buffer 20 is overwritten on the intermediate data Z which is not needed in the next output line, and used for generating the next output line.

In the present invention as described above, each operation is performed at the same time, one line memory is time-sliced, and updated and used according to the operation to perform the same operation as before. Therefore, it is not necessary to use the 2-line line memory used in the existing VDP, thereby reducing the chip size.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

For example, in the above-described embodiment, the case where the 5-tap vertical filter and the x-tap horizontal filter are used as an example has been described.

The present invention described above has the effect of reducing the chip size by implementing the VDP using only one line memory, thereby contributing to the miniaturization of the digital broadcast reception system.

Claims (3)

A video display processor of a digital broadcast receiving system, Buffering means for buffering image data input from an external memory; A line memory for updating and storing line data input from said buffering means and intermediate data input from vertical filtering / interpolation means; The vertical filtering / interpolation means for vertically filtering and interpolating the line data stored in the line memory to generate intermediate data; And Horizontal filtering / interpolation means for horizontally filtering and interpolating intermediate data inputted from the vertical filtering / interpolation means and previous intermediate data stored in the line memory to output the output image data. The video display processor of the digital broadcast receiving system comprising a. The method of claim 1, The vertical filtering / interpolation means, A video display processor of a digital broadcast receiving system comprising a 5-tap vertical filter. The method of claim 2, The line memory, A video display processor of a digital broadcast receiving system, characterized in that it is five lines of RAM.