KR0137359B1 - Method of steeling picture in vtr and device - Google Patents

Abstract

The present invention is a screen steel system having a memory suitable for NTSC signal in a global VCR applicable to TV signal systems all over the world. A method and apparatus, comprising: performing a predetermined line conversion and a field conversion on a luminance signal and a color signal of a TV signal of a predetermined method to be identical to a method of displaying a signal of the number of lines per frame and the number of fields per second to the memory; By storing the image data corresponding to the still screen and storing the image data, the image data corresponding to the still screen can be continuously provided.

Description

Screen steel method and device for video tape recorder

1 is a block diagram showing an embodiment of a screen still apparatus for a VCR for the world according to the present invention;

* Description of the symbols for the main parts of the drawings *

11,17: A / D converter 12,18: line converter

13,19: Line memory 14,20: Write control unit

15: memory 16: read control unit

21: D / A converter

The present invention relates to a worldwide video tape recorder (hereinafter referred to as VCR) applicable to TV signal systems all over the world, and especially for all types of TV signals in a screen steel system having a memory suitable for NTSC signal. The present invention relates to a screen still method and apparatus for a global VCR configured to enable screen still.

In general, the TV signal system uses a different method for each region or country. Accordingly, in the region, only a TV or VCR suitable for the TV signal system in the region was available. In order to alleviate the inconvenience caused by the different TV signals between these regions, TVs and VCRs for the world have been developed that can be applied to all TV signals in the world. The present invention relates to a system for implementing screen still in such a global VCR.

Currently, the world wide VCR performs the screen still function, and the screen still function cannot be performed with respect to TV signals having different signal specifications, or the screen tends to deteriorate. A VCR having an image data memory configured to perform screen still well displays a coarse screen when performing screen still on a TV signal such as PAL, SECOM, or PAL-N having different signal specifications. The main reason is the memory capacity of the VCR system. Different TV signals with different specifications have different lines per frame and fields per second. This is because there is a problem that can not be stored.

Such TV signal systems can be largely divided into two groups according to specifications. The first group is a TV signal system such as NTSC and PAL-M, and main specifications include 525 lines / frames and 60 fields / sec. The second group is a TV signal system such as PAL, SECOM, and PAL-N. The second group has 625 lines / frames and 50 fields / sec as main specifications. Now, when a TV signal of the first group described above is input as an input signal and a TV signal of the second group described above is output as an output signal to a worldwide VCR capable of screen still for an NTSC TV signal, Alternatively, when the TV signal of the second group is input and the TV signal of the first group is output, the capacity of the memory for storing the image data of the screen in frame or field units does not match the specification of the input / output TV signal. One problem arises.

Accordingly, an object of the present invention is to display a still picture of good image quality by executing screen still for all the TV signals used worldwide in a worldwide VCR system having a memory suitable for NTSC TV signals. It is to provide a screen still method.

Another object of the present invention is to provide a screen steel apparatus for implementing the above-described screen steel method of the global VCR.

An object of the present invention as described above is a method for performing a screen still function to steal an arbitrary screen in a VCR having a memory suitable for an NTSC TV signal as a global VCR applicable to TV signal systems all over the world. Converting the number of lines per frame of the input TV signal to be the same as that of the displayed signal; field converting the number of fields per second of the input TV signal to the same method as the displayed signal And a switching step for changing the execution order of the line conversion step and the field conversion step according to the method of the input TV signal and the method of the displayed TV signal.

Another object of the present invention is an apparatus for performing a screen still function to steal an arbitrary screen in a VCR having a memory suitable for an NTSC TV signal as a global VCR applicable to TV signal systems around the world. Means for converting the number of lines per frame to be the same as the type of the displayed signal by receiving a TV signal of a predetermined method, and for converting the number of fields per second to be equal to the type of the displayed signal by receiving the TV signal of the predetermined type Means and a switching means for changing the processing path of the input signal so that the input signal is first supplied to the line converting means or the field converting means in accordance with the method of the input TV signal and the method of the TV signal being displayed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows an embodiment of a screen still apparatus for a worldwide VCR. The apparatus of FIG. 1 is a line converter for converting the number of lines per frame of the TV signal of the predetermined method to be the same as that of the displayed signal, and the number of fields per second of the input TV signal is the same as that of the displayed signal. And a plurality of switches for appropriately selecting an operation sequence of the line conversion unit or the field conversion according to the specifications of the field conversion unit for conversion and the input signal and the output signal. In addition, the line converter, the field converter and the switch perform a predetermined change process on the luminance signal Y and the color signal C of the input TV signal, respectively.

In the apparatus of FIG. 1, the following four modes are possible as the above-described first and second group TV signals are used as input or output signals, respectively. A first mode in which a TV signal of a first group is input and a TV signal of a second group is output, a second mode and a first mode in which a TV signal of a second group is input and a TV signal of a first group is output. A third mode in which a group TV signal is input and a first group TV signal is output and a fourth mode in which a TV signal of the second group is input and a second group of TV signals are output are possible. In such a plurality of modes, a series of conversion processes for the luminance signal (Y) and the color signal (C) of the input TV signal is performed in the same manner for each signal, so the luminance signal (Y) will be described in detail here.

In the case of the first mode, the TV signal of the first group described above should be converted into the TV signal of the second group. That is, it is necessary to convert 525 lines / frames to 625 lines / frames and 60 fields / seconds to 50 fields / seconds. The luminance signal Y of the first group of TV signals having 525 lines / frame and 60 fields / second is converted into a digital signal by the first A / D converter 11. The first group of digital signals is first stored in the memory 15, and field conversion is performed. That is, under the control of the first write control unit 14, a signal of 50 fields / second among the 60 fields / second signal is stored in the memory 15. In this case, the 'c' terminal of the first switch SW1 is connected to the 'a' terminal, and the 'c' terminal of the second switch SW2 is connected to the 'a' terminal. The first group signal converted to 50 fields / second is read by the read control unit 16 and supplied to the line conversion unit consisting of the first line converter 12 and the first line memory 13 through the first switch SW1. do. At this time, the 'c' terminal of the third switch SW3 is connected to the 'a' terminal. The line converter converts the first group signal of 525 lines / frame into 625 lines / frame signal. The first line memory 13 stores the corresponding line every predetermined time in the input 525 line / frame signal and supplies it to the first line converter 12. Then, the first line converter 12 adds different weighting values to each line of the line data supplied through the first switch SW1 and the line data supplied from the first line memory 13. By appropriate addition, a signal of 625 lines / frame is output. The digital signal, which is line-converted and field-converted to the second group signal of 625 lines / frame and 50 fields / second, is supplied to the D / A converter 21 through the third switch SW3. Then, the D / A converter 21 converts the second group of digital signals into analog signals. On the other hand, the first group of color signals C converted into digital signals by the second A / D converter 17 are field-converted by the second write controller 20 and the memory 15 in the same manner as the luminance signal Y described above. And line conversion in the second line converter 18 and the second line memory 19. In this case, the 'c' terminal of the fourth switch SW4 is connected to the 'a' terminal, and the 'c' terminal of the fifth switch SW5 is connected to the 'a' terminal. Then, the digital color signal converted into the second group signal is supplied to the D / A converter 21 via the sixth switch SW6. At this time, the 'c' terminal of the sixth switch SW6 is connected to the 'a' terminal. As described above, the luminance signal Y and the color signal C of the first group are respectively converted into the luminance signal Y and the color signal C of the second group through the same conversion process.

In the case of the second mode, the above-described second group TV signal must be converted into the first group TV signal. That is, 625 lines / frames must be converted to 525 lines / frames, and 50 fields / seconds must be converted to 60 fields / seconds. Since the memory 15 cannot store image data for two fields of the second group signal (memory capacity is insufficient even when storing), the field conversion must be performed first after the line conversion. The luminance signal Y of the second group of TV signals having 625 lines / frame and 50 fields / second is converted into a digital signal by the first A / D converter 11. This second group of digital signals is first supplied to a line conversion section consisting of a first line converter 12 and a first line memory 13. Then, the line converter converts 625 lines / frames to 525 lines / frames as in the first mode. That is, the luminance signal Y is line-converted by removing the corresponding line from the input second group signal every predetermined second to be 525 lines per frame, and adding a predetermined weight to each line in the first line converter 12. ) At this time, the 'c' terminal of the first switch SW1 is connected to the 'b' terminal. The luminance signal Y converted in this manner is stored in the memory 15 via the second switch SW2 and the first write control unit 14. The control signal of the first write control unit 14 controls 50 fields / second. The luminance signal is stored as a signal of 60 fields / second. That is, a signal of 60 fields per second is stored in the memory 15 by repeatedly storing the corresponding fields every predetermined time in the signal of 50 fields per second. At this time, the 'c' terminal of the second switch SW2 is connected to the 'b' terminal. The D / A converter 16 performs line conversion and field conversion at 525 lines / frame and 60 fields / second to continuously read signals of two fields corresponding to still screens from the luminance signal stored in the memory 15. The luminance signal read by the read controller 16 is supplied to the D / A converter 21 via the sixth switch SW6. At this time, the 'c' terminal of the sixth switch SW6 is connected to the 'b' terminal. The read control unit 21 converts the digital luminance signal converted into the first group signal into an analog signal and outputs the analog signal. On the other hand, the second group of color signals C converted into digital signals by the second A / D converter 17 are similar to the above-described luminance signal Y, so that the second line converter 18 and the second line memory 19 are similar to each other. A line conversion is performed by the line conversion section consisting of the second conversion control section and the field conversion is performed by the second write control section 20 and the memory 15. In this case, the 'c' terminal of the fourth switch SW4 is connected to the 'b' terminal, and the 'c' terminal of the fifth switch SW5 is connected to the 'b' terminal. The digital color signal converted into the first group signal in this way is supplied to the D / A converter 21 via the sixth switch SW6. At this time, the 'c' terminal of the sixth switch SW6 is connected to the 'b' terminal. In this way, the luminance signal Y and the color signal C of the second group are respectively converted into the luminance signal Y and the color signal C of the first group through the same conversion process.

In the third mode, the signal of the first group is input and the signal of the first group is output, thereby eliminating the need for the line conversion and field conversion as described above. In the memory 15, image data of two fields corresponding to a screen to be stealed from the first group signal to be input are stored once in the memory 15, and the image data is continuously read by the read control unit 16 to the screen still. Come true. In this manner, when the image data corresponding to the still screen is read out from the memory 15, a predetermined synchronization signal must be loaded in accordance with the even field and the odd field.

In the fourth mode, the TV signal of the second group is input and outputs the signal of the second group. In this case, if the input signal is stored in the memory 15, still of the field is possible, but since the capacity of the memory 15 is insufficient, still of the frame is impossible. Therefore, a predetermined line conversion is performed on the input second group signal and stored in the memory 15. The stored signal is read out and line converted again to output the second group signal. The luminance signal Y of the second group is converted into a digital signal by the first A / D converter 11, and the digital signal is a line converter composed of the first line memory 13 as in the above-described second mode. The line conversion from to 525 lines / frame is stored in memory 15. At this time, the 'c' terminal of the first switch SW1 is connected to the 'b' terminal, and the 'c' terminal of the second switch SW2 (connected to the 'b' terminal. Thus, 2 corresponding to the still screen The image data of the four fields is stored in the memory 15 as signals of 525 lines / frame and 50 fields / second, and the stored signals are read by the read control unit 16 and supplied to the line converting unit. The 'c' terminal of SW3) is connected to the 'a' terminal, and the 'c' terminal of the first switch SW1 is connected to the 'a' terminal, and then the line converting unit lines 525 lines of signals per frame again. The signal is converted into a signal of 625 lines per frame, and the output signal of the converted first line converter 12 is supplied to the D / A converter 21 via the third switch SW3. The / A converter 21 is supplied with a second group of signals having 625 lines / frame and 50 fields / second to be converted into an analog signal, while a second group input to the second A / D converter 17 is input. The color signal C of the group is stored in the next memory 15 which is line-converted by a line conversion unit composed of the second line converter 18 and the second line memory 19, similarly to the luminance signal Y described above. The stored signal is read by the read control unit 16, and line conversion is performed again by the line conversion unit, and outputs the color signal C of the second group.

As described above, the screen still method and apparatus according to the present invention, in the world-wide VCR having a memory suitable for NTSC TV signal, the input TV signal of the predetermined method or the memory of the same standard as the NTSC method The image data corresponding to the still picture is stored by converting the signal into a signal in a form that can be stored in the memory, and the line data and / or field conversion are performed by reading the stored image data. Then, the TV signal of the way to be finally displayed is obtained. Accordingly, the screen steel system according to the present invention can effectively perform the screen steel function for all types of TV signals.

Claims (15)

A method for performing a screen still function for stealing an arbitrary screen in a VCR having a memory suitable for an NTSC TV signal as a global VCR applicable to TV signal systems around the world, wherein the TV signal of a predetermined method is input. Line converting the number of lines per frame to be the same as the manner of the displayed signal; Field converting the number of fields per second of the TV signal of a predetermined type to be the same as that of the displayed signal; And a switching step for changing the execution order of the line conversion step and the field conversion step according to the method of the input TV signal and the method of the TV signal to be displayed. The method according to claim 1, wherein the line conversion step comprises: performing the line conversion on a luminance signal of a TV signal of a predetermined type; And performing the line conversion on a color signal of an input TV signal of a predetermined type. The method of claim 1, wherein the field conversion step comprises the steps of: performing the field conversion on the luminance signal of the TV signal of a predetermined type; And performing the field conversion on a color signal of an input TV signal of a predetermined method. The method of claim 1, wherein the switching step comprises the steps of: performing the switching on a luminance signal of a TV signal of a predetermined type; And performing the switching on a color signal of an input TV signal of a predetermined type. The global switching method of claim 1 or 4, wherein the switching comprises performing the line conversion before the field conversion when the number of lines per frame of the input signal is larger than a memory capacity for storing a still picture. How to Use the Screen Still of Your VCR The method of claim 1, wherein the switching comprises performing the field conversion before the line conversion when the number of lines per frame of the input signal is equal to a memory capacity for storing a still picture. Screen still method of world wide VCR. A device for performing a screen still capable of stealing an arbitrary screen in a VCR having a memory suitable for an NTSC TV signal as a worldwide VCR applicable to TV signal systems around the world, wherein a TV signal of a predetermined method is supplied. Means for line converting the number of lines per frame to be the same as that of the displayed signal; Means for receiving a TV signal of a predetermined type and field converting the number of fields per second to be equal to that of the displayed signal; And switching means for changing the processing path of the input signal so that the input signal is first supplied to the line converting means or the field converting means in accordance with the method of the input TV signal and the method of the displayed TV signal. How to use screen stills around the world. 8. The apparatus of claim 7, wherein the line converting means comprises: a line memory which receives a TV signal of a predetermined type and stores the line signal in a line (horizontal scan line) unit; And a line converter which receives the signal stored in the line memory and the input signal, combines the number of lines per frame to be the same as the displayed signal, and adds a predetermined weight to each line. How to Use the Screen Still of Your VCR 8. The apparatus of claim 7, wherein the field converting means comprises: a memory having a memory capacity suitable for an NTSC TV signal; A write control unit receiving an input TV signal of a predetermined type and storing it in the memory such that the number of fields per second of the signal is the same as that of the displayed signal; And a read control unit for continuously reading image data corresponding to a still screen stored in the memory. 9. The apparatus according to any one of claims 7 and 8, wherein the line converting means receives a luminance signal of a TV signal of a predetermined type to convert the number of lines per frame of the luminance signal to be the same as that of the displayed signal. Way; And means for receiving a color signal of an input TV signal of a predetermined type and converting the number of lines per frame of the color signal to be the same as that of the displayed signal. 10. The apparatus according to any one of claims 7 to 9, wherein the field converting means receives a brightness signal of an input TV signal of a predetermined method and converts the number of fields per second of the brightness signal to be the same as that of the displayed signal. ; And means for receiving a color signal of an input TV signal of a predetermined method and converting the number of fields per second of the color signal to be the same as that of the displayed signal. The method of claim 7, wherein the switching means is a TV signal of a predetermined method is input to the first terminal of one side, the output of the field conversion means is applied to the second terminal of one side, the other terminal is A first switch, coupled to the line converting means, for selectively transmitting the TV signal or the output signal of the field converting means to the line converting means; The first terminal of one side is connected to the first terminal of one side of the first switch, the second terminal of one side is connected to the output terminal of the line conversion means, the other terminal is coupled to the field conversion means, the predetermined A second switch for selectively transmitting a TV signal or an output signal of the line converting means to the field converting means; And a first terminal of one side is connected to an output terminal of the read control unit, a second terminal of one side is connected to an output terminal of the line converting means, and a terminal of the other side is connected to a means for displaying the converted signal. And a third switch for selectively transmitting the output signal or the output signal of the line conversion means to the display means. The method of claim 12, wherein the first switch is applied with a luminance signal of the TV signal of the input method to the first terminal on one side, and a predetermined field conversion for the luminance signal is applied to the second terminal on one side. An output signal of a field converting means is applied, and the other terminal comprises: a switch connected to an input terminal of a line converting means for performing a predetermined line conversion on the luminance signal; The first terminal of one side is applied a color signal of the input TV signal, the second terminal of one side is applied an output signal of the field conversion means for performing a predetermined field conversion on the color signal, the other side And a terminal comprising another switch connected to an input terminal of a line conversion means for performing a predetermined line conversion on the color signal. The method of claim 12, wherein the second switch is applied with a luminance signal of the TV signal of the input method to the first terminal of one side, and a predetermined line conversion for the luminance signal to the second terminal of one side An output signal of a line converting means is applied, and the other terminal comprises: a switch connected to an input terminal of a field converting means for performing a predetermined field conversion on the luminance signal; The first terminal of one side is applied with the color signal of the input TV signal, the second terminal of one side is applied with the output signal of the line conversion means for performing a predetermined line conversion on the color signal, the other side And a terminal comprising another switch connected to an input terminal of a field converting means for performing a predetermined field conversion on the color signal. The first switch of one side of the third switch is connected to an output terminal of a line conversion means for performing a predetermined line conversion on the luminance signal of the TV signal. A second terminal connected to an output terminal of the read control unit for reading data of the field converting means for performing a predetermined field conversion on the luminance signal; The first terminal of one side is connected to an output terminal of the line conversion means for performing a predetermined line conversion on the color signal of the TV signal, and the second terminal of one side of the field conversion means for performing a predetermined field conversion on the color signal. And another switch connected to an output terminal of the read control unit for reading data.