KR100256388B1 - Method for zooming local picture in the vcd system - Google Patents

Abstract

PURPOSE: An enlarging method for a partial image in a VCD(Video Compact Disk) play system is provided to enlarge a specific area of a reproduced image through generating grates of a specific size for the reproduced image. CONSTITUTION: By input of a partial image enlarging command(201), a pause mode is established(202). By using an OSD(On Screen Display) function, grates of a specific size are generated on a still image(204). A user detects numbers of horizontal and vertical grates for a selected portion to be enlarged. An enlarging rate is decided by calculating a number to be multiplied to the selected grate number. Herein, the multiplied result is smaller than a maximum grate number toward one direction. Then, pixel data for the selected portion are windowed for being enlarged by the decided enlarging rate(205). The enlarged image is displayed(207). By input of a playback mode, the pause mode is released to playback the image(209).

Description

TECHNICAL FOR ZOOMING LOCAL PICTURE IN THE VCD 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, the partial screen magnification method according to the present invention comprises picking up a video signal recorded on an optical disc, performing digital signal processing, decoding and reproducing the digital signal processed data, and turning on the reproduced video signal. A video disc play system capable of applying a screen display (OSD) function, comprising: 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 of a predetermined size on a paused screen using an on-screen display function; Detecting the number of horizontal grids and the number of vertical grids for the portion that the user wants to enlarge through the generated grids; Selecting one of the detected grating numbers, determining n as a corresponding magnification ratio by obtaining n satisfying a condition that the value of the selected grating number x n is smaller than the maximum grating number in one direction generated in the grating generation step; If the enlargement ratio is determined, windowing the pixel data of the portion to be enlarged; Enlarging and storing the windowed pixel data by the determined enlargement ratio; Displaying the enlarged screen stored in the storing step for the user to recognize; After performing the display step, if a command for controlling the play mode is applied, the step of releasing the pause mode and controlling so that normal playback is performed.

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 a flowchart illustrating a method of enlarging a partial screen according to the present invention;

3 is an exemplary diagram of a screen grid;

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

<Explanation of symbols for main parts of drawing>

100: optical disk 101: key input unit

102: control unit 103: servo unit

104: digital signal processing unit

105: Moving Picture Expert Group (MPEG) Decoder

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

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

Hereinafter, an embodiment of the present invention will be described 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 magnification method according to the present invention, and 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 the video and / or audio signal output from the digital signal processing unit 104, and decoder 105, DRAM 106 The video signal output from the MPEG decoder 105 is converted into R (Red), G (Green) and B (Blue) signals, and converted into a composite video signal and output to the video signal processor 107 and the controller 102. Controlled by video signal An on-screen display process for the image information output from the processor 107, and in particular, an OSD processor 108 which is controlled by the controller 102 to perform the on-screen display process so as to generate a screen grid in order to implement the present invention. The video output unit 109 displays an image signal output from the OSD processor 108.

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.

Normal NTSC NormalPAL HighNTSC HighPAL Horizontalsize 44 44 88 88 VerticalSize 30 36 60 72

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 obtained horizontal lattice with the number of the longitudinal lattice (2 <3), the number of the longitudinal 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.

Claims (3)

A video disc play system capable of picking up a video signal recorded on an optical disc to perform digital signal processing, decoding and playing the digital signal processed data, and applying an on-screen display (OSD) function to the reproduced video signal. To 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 of a predetermined size on a paused screen using an on-screen display function; Detecting the number of horizontal grids and the number of vertical grids for the portion that the user wants to enlarge through the generated grids; Selecting one of the detected grating numbers, determining n as a corresponding magnification ratio by obtaining n satisfying a condition that the value of the selected grating number x n is smaller than the maximum grating number in one direction generated in the grating generation step; If the enlargement ratio is determined, windowing the pixel data of the portion to be enlarged; Storing the windowed pixel data enlarged by the determined enlargement ratio; Displaying the enlarged screen stored in the storing step for the user to recognize; After the display step, if a command to control the playback mode is applied, the method comprising the step of releasing the pause mode and controlling the normal playback is performed. . The method of claim 1, wherein the method for expanding the partial screen comprises: extracting a left-top grid position during display in consideration of the enlargement ratio so that the enlarged screen can be displayed at the center of the screen after determining the enlargement ratio. The method of enlarging the partial screen in a video disc play system, characterized in that it further comprises. The method of claim 1, wherein the partial screen enlargement method comprises: a maximum grid in one direction that determines the enlargement ratio when 8 × 8 predetermined size grids are generated for one screen in the grid generation step. And the number is set to eight and operated.

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