KR19980078984A - How to Enlarge Partial Screen in Video Disc Play System - Google Patents

Abstract

The present invention relates to a partial screen enlargement method capable of enlarging and playing only a desired partial region of a screen to be played back in a video disc play system. To this end, the present magnification method comprises the steps of: in a video disc play system having an on-screen display (OSD) function, setting a mode for pausing a screen currently being played when a partial screen magnification command is received from a user; A grid generation step of generating a grid of a predetermined size on a paused screen using an on-screen display function; Selecting a grid size of a portion to be enlarged through the generated grid; Calculating an enlargement ratio of the grid size selected in the selection step; If the enlargement ratio is calculated, windowing the pixel data within the grid size selected in the selection step; Enlarging and storing the pixel data windowed by the enlargement ratio calculated in the calculating step; And an output step of outputting the magnified data stored in the storage step so that the user can view it.

Description

How to Enlarge Partial Screen in Video Disc Play System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of enlarging a playback screen in a video compact disk (hereinafter, referred to as VCD) play system, and more particularly to a method of enlarging a partial screen in which only a part of a desired video screen can be enlarged.

As is well known, the VCD play system records or reproduces digital image information on an optical disc, and is implemented to reproduce not only still images but also moving image information. However, only full screen playback is supported, so it is impossible to enlarge and play only a part of the screen that you want to see.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described drawbacks, and provides a partial screen magnification method capable of enlarging and playing only a desired partial area of a screen to be played in a video disc play system.

Another object of the present invention is to provide a partial screen enlargement method capable of enlarging and playing a partial region of a screen to be reproduced by generating a grid having a predetermined size for a playback screen in a video disc play system.

In order to achieve the above objects, a partial screen magnification method according to the present invention is a video disc play system having an on-screen display (OSD) function, and when a partial screen magnification command is applied from a user, a pause of a screen currently being played is paused. Setting a mode to operate; A grid generation step of generating a grid of a predetermined size on a paused screen using an on-screen display function; Selecting a grid size of a portion to be enlarged through the generated grid; Calculating an enlargement ratio of the grid size selected in the selection step; If the enlargement ratio is calculated, windowing the pixel data within the grid size selected in the selection step; Enlarging and storing the pixel data windowed by the enlargement ratio calculated in the calculating step; And an output step of outputting the stored magnification data for the user to view.

1 is a schematic functional block diagram of a video disc play system for performing a partial screen enlargement method according to the present invention;

2 is an operation flowchart illustrating a partial screen enlargement method according to the present invention;

3 is an exemplary screen grid;

4 is an exemplary view when the partial screen is enlarged twice.

Explanation of symbols for main parts of the drawings

100: optical disk 101: key input unit

102: control unit 103: servo unit

104: digital signal processing unit 105: MPEG (Moving Picture Expert Group) decoder

106: DRAM (Dynamic RAM) 107: Video signal processor

108: OSD (On Screen Display) processing unit 109: Video output unit

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, an embodiment of the present invention for achieving the above object in detail.

FIG. 1 is a schematic functional block diagram of a video disc (hereinafter, referred to as VCD) play system for performing a partial screen enlargement method according to the present invention, which is mainly shown in a functional block for processing image information. Therefore, the VCD play system illustrated in FIG. 1 controls an optical disc 100 capable of recording or playing back video and / or audio information, a key input unit 101 for applying a user's command, and an overall function of the VCD play system. The control unit 102, the control unit 102 to control the drive of the optical disc 100, the servo unit 103 for picking up and outputting information, and the video and / or audio information output from the servo unit 103 Digital signal processing unit 104 for digital signal processing, MPEG decoder 105 for decoding and outputting video and / or audio signal output from digital signal processing unit 104, DPRAM 106, MPEG decoder ( 105 is controlled by the video signal processing unit 107 and the control unit 102 to convert the video signal output from the R (Red), G (Green), B (Blue) signal to convert to a composite video signal and output the video signal Signal processing unit 107 OSD processing unit 108, OSD processing unit 108 to perform the on-screen display processing for the image information output from the display, and in particular to control the control unit 102 to perform the on-screen display processing to generate the screen grid in order to implement the present invention And an image output unit 360 for displaying an image signal output from the.

2 is a flowchart illustrating a method of enlarging a partial screen according to the present invention, and FIG. 3 is an exemplary diagram of a screen grid generated on the image output unit 109 by the OSD processing unit 108, and FIG. It is an example figure in the case of magnification.

1, 3, and 4, the operation of the partial screen enlargement method according to the present invention shown in FIG. 2 will be described in detail.

First, when a partial enlargement command is input through the key input unit 101 in step 201, the control unit 102 proceeds to step 202 to perform a function of the system so that playback is temporarily stopped while a screen currently being played is displayed. To control. As a result, the video output unit 109 displays the playback picture as a still picture (or still picture) at the time when playback is stopped.

The control unit 102 then proceeds to step 203. In operation 203, the controller 102 controls the OSD processor 108 to generate a grid having a predetermined size for the still image being displayed through the image output unit 109. That is, as shown in FIG. 3, 8x8 (= 64) grids are generated (or generated) for the still image. When generating 8x8 lattice, the size of the pixel per unit grid is shown in Table 1 below.

TABLE 1

When the screen grid is generated, the controller 102 proceeds to step 204 to determine the grid size to be enlarged. That is, when the user views the grid displayed as shown in FIG. 3 through the image output unit 109 and the user applies a (Left-Top, Right-Bottom) value for the grid to be enlarged through the key input unit 101. The controller 102 compares the number of horizontal lattice and vertical lattice obtained by analyzing the applied (Left-Top, Right-Bottom) values. As a result of the comparison, the grid size is determined by selecting the larger grid number to calculate the magnification ratio and extracting the output Left-Top value so that the enlarged screen can be displayed centered on the screen using the calculated magnification ratio. .

For example, when the (Left-Top, Right-Botton) value applied from the user is (7, 24) in FIG. 3, the control unit 102 obtains 2 as the horizontal grid and 3 as the vertical grid. As a result of comparing the number of the horizontal lattice and the number of the vertical lattice obtained (23), the number of vertical lattice is large, so 3 is selected. The screen magnification is calculated using the number 3 of the selected grids. The screen enlargement ratio is determined as a value of n that can satisfy the condition (the number of lattice x n <8) that the value of the number of grids x n should be less than 8. That is, in the above-described example, since the number of gratings is three, the maximum value of the variable n for satisfying the condition that 3xn is smaller than eight is two. Therefore, the screen magnification for (7, 24) is doubled. When the screen magnification is determined as described above, the position of the left-top to which the enlarged screen is output is extracted. Here, the position of the grid (11) of FIG. 3 is extracted as the value of the left-top. That is, when the grid of (7, 24) is doubled, the number of horizontal grids is 4 and the number of vertical grids is 6, so the grid position of (11, 54) is displayed in order to display a 4 × 6 grid in the center. Left-Top becomes (11) as above.

When the overall size for the enlargement of the predetermined lattice to be enlarged is determined as described above, the control unit 102 proceeds to step 205 to window the pixel data in the selected grid. That is, when the predetermined grid selected as in the above-described example is (7, 24), the RAM of the controller 102 stores pixel data corresponding to 7, 8, 15, 16, 23, and 24 grids shown in FIG. It is stored in the (RAM, not shown) area and windowed for the pixel data.

In operation 206, the pixel data windowed is enlarged according to the enlargement ratio determined in operation 204 and stored in the DRAM 106. That is, the pixel data (pixel data in the 7, 8, 15, 16, 23, and 24 grids by the above-described example) stored in the RAM not shown in the control unit 102 and windowed in step 205 is shown in FIG. 4. As described above, it is enlarged twice and stored in the DRAM 106. In operation 207, the enlarged pixel data stored in the DRAM 106 is transferred to the image output unit 109 via the MPEG decoder 105, the video signal processor 107, and the OSD processor 108. Be sure to At this time, the position of the enlarged screen displayed on the image output unit 109 is determined by the output Left-Top value extracted in step 204. That is, the controller 102 controls the operation of the OSD processor 108 by using the above-described output Left-Top value so that the enlarged screen is displayed at the center of the screen.

After the enlargement of the desired partial screen as described above, if a command (play key) for controlling the play mode is applied from the key input unit 101, the control unit 102 proceeds to step 209 through step 208, and then in step 202. The pause mode for the set playback screen is released, and the servo unit 103 is controlled so that normal playback is continued.

As described above, the present invention provides a method of partially enlarging a screen of a desired partial region of a screen played in a video disk play system, thereby diversifying the functions of the video disk play system.

Although the present invention has been described as the above-described embodiment, 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 detailed description of the specification but should be defined by the claims.

Claims (4)

In a video disc play system having an on-screen display (OSD) function, Setting a pause mode for a screen currently being played when a partial screen magnification command is received from a user; A grid generation step of generating a grid having a predetermined size on the paused screen by using the on-screen display function; Selecting a grid size of a portion to be enlarged through the generated grid; Calculating an enlargement ratio of the grid size selected in the selection step; If the enlargement ratio is calculated, windowing the pixel data within the grid size selected in the selecting step; Enlarging and storing the windowed pixel data by the enlargement ratio calculated in the calculating step; And an output step of outputting the enlarged data stored in the storing step so that the user can view the partial screen. The method of claim 1, wherein the partial screen enlargement method further comprises: extracting a left-top grid position when the enlarged screen is output so that the selected grid size is displayed at the center of the screen after calculating the enlargement ratio. Partial screen enlargement method, characterized in that. The method of claim 1, wherein the grid generation step generates a grid of 8 × 8 predetermined sizes for one screen. The method of claim 1 or 2, wherein the partial screen enlargement method further includes, after performing the output step, canceling the pause mode and controlling normal playback if a command for controlling a playback mode is applied. Partial screen enlargement method, characterized in that performed by.