KR100244869B1 - Device and method of image control in tv system including dvd player - Google Patents

Abstract

The present invention relates to a composite TV system with a built-in DVD player, and in particular, to determine the video-CD and DVD and to set the sharpness values differently so that the screen sharpness is adjusted to achieve an optimal picture quality. The present invention relates to an apparatus and method for controlling image quality of a composite TV system device having a built-in DVD player.

In a conventional TV system with a built-in DVD player, a constant sharpness value is set without distinguishing between a VIDEO-CD and a DVD, which causes a problem in that image quality cannot be actively controlled according to an input signal source.

Therefore, in order to solve the above-mentioned problems, the present invention distinguishes the VIDEO-CD signal source and the DVD signal source after restoring the video signal and independently controls the image quality. In this case, the main purpose is to realize the optimum image quality by detecting the signal source state by the blocking detection unit and controlling the image quality according to the detection result.

Description

Image Quality Control Device and Method in Composite TV System with Integrated DVD Player

The present invention relates to a composite TV system with a built-in DVD player, and in particular, sets SHARPNESS differently according to VIDEO-CD and DVD modes, and in the case of VIDEO-CD, depending on the state of a signal source. The present invention relates to an apparatus and method for controlling image quality in a composite TV system in which a DVD player is embedded to adjust screen sharpness to achieve an optimal image quality.

As shown in FIG. 1, the structure of an image quality control device in a composite TV system having a built-in DVD player includes a DVD player 10 for decoding and outputting a video signal from a DVD or a VIDEO-CD, and the DVD player 10. It is composed of a TV display unit 20 for displaying the video signal decoded by the output on the CPT screen.

The DVD player 10 restores the brightness (Y) by restoring the video signal compressed on the DVD or VIDEO-CD under the control of the DVD microcomputer 11 and the DVD microcomputer 11. And a video decoder 12 which outputs a color C signal.

The TV display unit 20 includes a TV microcomputer 21 for controlling each system and the luminance and color signals output from the video decoder 12 under the control of the TV microcomputer 21 to the CPT 23. And an image signal processor 22 for signal processing for display.

The operation of the image quality control device in the composite TV system in which the conventional DVD player is configured as described above will be described with reference to FIG. 1.

First, when the TV mode is switched from the TV mode to the DVD mode, the DVD microcomputer 11 recognizes that the mode has been switched from the TV microcom 21 and controls the video decoder 12 so that the video signal compressed and recorded on the DVD or VIDEO-CD is received. The video decoder 12 restores the video decoder 12 and outputs the luminance and color signals to the TV display unit 20.

At this time, the TV microcomputer 21 recognizes that the DVD or VIDEO-CD is being played from the DVD microcomputer 11 and sets a constant SHARPNESS value 80 to control the video signal processor 22.

In the meantime, the image signal processor 22 processes the luminance and color signals output from the video decoder 12 according to the sharpness value set by the TV microcomputer 21 and displays them on the screen of the CPT 23.

However, in a conventional TV system with a built-in DVD player, a VIDEO-CD has a resolution of 320 * 240 and a high compression ratio (about 50 times), and such a VIDEO-CD has largely influenced image quality by the data encoding method. On the other hand, since DVD has a resolution of 720 * 480, which is twice that of VIDEO-CD, it is necessary to control the sharpness value by dividing these signal sources. In the related art, a constant sharpness value is set so that it is active according to the input signal source. There is a problem that can not control the image quality.

Therefore, in order to solve the above-mentioned problems, the present invention separately controls the video-CD and the DVD to independently control the image quality, and in the case of the video-CD having a large difference in image quality depending on the signal source, the blocking detection unit is configured by the signal. The main purpose is to realize the optimum image quality by controlling the image quality after detecting the original state.

1 is a block diagram showing the configuration of an image quality control apparatus in a conventional TV system with a built-in DVD player.

Figure 2 is a block diagram showing the configuration of the image quality control device in a composite TV system with a built-in DVD player of the present invention

Figure 3 is a block diagram showing the configuration of the blocking detection unit of the present invention

4 is a flowchart illustrating a method of controlling image quality in a composite TV system incorporating the present invention DVD player.

In the composite TV system in which the present invention has a built-in DVD player for achieving the above object, as shown in FIG. 2, a DVD player 10 which decodes and outputs a video signal recorded on a DVD or VIDEO-CD is shown in FIG. 2. And a blocking detection unit 30 for detecting a signal source state of the VIDEO-CD video signal output from the DVD player 10 and outputting the detected signal to the TV microcom 21, and the blocking detection unit 30. It is composed of a TV display unit 20 for changing the sharpness value according to the detection result of the display to display the video signal decoded by the DVD player 10 on the CPT (23) screen.

The blocking detection unit 30 amplifies a high pass filter (HPF) 31 for passing only high frequency components of the luminance signal output from the video decoder unit 12 and a high frequency signal passing through the HPF 31. An amplifier 32, a diode D1 for rectifying the signal amplified by the amplifier 32, a resistor R1 and a capacitor for converting the signal rectified by the diode D1 into a direct current voltage DC. C1), a synchronous separator 33 for separating only a synchronous signal from the luminance signal output from the video decoder 12, and a phase inverter for phase inverting the synchronous signal separated from the synchronous separator 33 ( 34 and a transistor Q1 that is turned on / off by the synchronization signal phase-inverted by the phase inversion unit 34.

Meanwhile, FIG. 4 is a flowchart illustrating a method of controlling image quality in a composite TV system in which a DVD player is embedded in the present invention.

A first step of determining whether the current mode by the user selection is a TV mode, a DVD mode, or a VIDEO-CD; and, if the determination result is a DVD, a second step of setting a constant sharpness value corresponding to the DVD in the TV micom 21; And, if the result of the first process judgment VIDEO-CD, characterized in that proceeds to the third process of setting the sharpness value in inverse proportion to the number of blocking per field by checking the blocking detection unit 30 in the TV micom 21,

In addition, the third process is a variable range setting process of setting a variable range of sharpness suitable for the VIDEO-CD mode to prevent deterioration of image quality in a low-resolution VIDEO-CD mode, and a VIDEO-CD mode with a value within the variable range. The initial setting process of setting the sharpness initial value of the signal, the blocking signal checking process of checking the detection signal level of the blocking detection part determined according to the state of the blocking signal, and the high blocking result of the check signal, the sharpness value is lowered. If the detection signal is low, the blocking is low, so it is composed of a sharpness adjustment process of adjusting the sharpness value in inverse proportion to the detection signal by increasing the sharpness value.

Referring to Figures 2 to 4 the operational effects of the image quality control device and method in a composite TV system with a built-in DVD player of the present invention implemented as described above is as follows.

First, when the TV mode is switched from the TV mode to the DVD mode, the DVD microcomputer 11 recognizes that the mode is switched from the TV microcom 21 and controls the video decoder unit 12 so that the video signal compressed and recorded on the DVD or VIDEO-CD is received. The video decoder 12 restores the output signal to the video signal processor 22 and the blocking detector 30 as luminance and color signals.

At this time, the TV microcom 21 recognizes that the DVD or VIDEO-CD is being played from the DVD microcom 11, and controls the image quality with a predetermined DVD sharpness value (about 80) in the DVD mode and blocks in the VIDEO-CD mode. The sharpness value is changed according to the detection result of the detector 30 to control the image signal processor 22.

That is, as shown in FIG. 3, the HPF 31 of the blocking detection unit 30 passes only a high frequency signal of 2.5 MHz or more among the luminance signals output from the video decoder unit 12, from which the video decoder unit 12 When the output luminance signal is VIDEO-CD, the resolution is low and it has high frequency component up to about 2MHz when encoding the image data. Therefore, only the blocking signal passes through the HPF 31 and the amplifier 32 ) Is entered.

Meanwhile, the high frequency signal passing through the HPF 31 is amplified by the amplifier 32, rectified by the diode D1, charged to the capacitor C1 through the resistor R1, and charged to the capacitor C1. Is recognized by the TV microcomputer 21 as a DC voltage proportional to the number of blocking.

Therefore, when the DC level input to the TV microcomputer 21 becomes high, the TV microcom 21 can be confused that a lot of blocking occurs.

In addition, the synchronization separator 33 of the blocking detection unit 30 separates only the synchronization signal from the luminance signal output from the video decoder unit 12, and the synchronization signal is inverted by 180 degrees in the phase inversion unit 34. The transistor Q1 is turned on / off every 1H section through the resistor R2 to detect the number of blocking blocks every 1H section.

At this time, when the transistor Q1 is turned on, a high signal (3 V or more) is output to the TV micom 21. When the transistor Q1 is turned off, a low signal (3V or less) is output to the TV micom 21, which is DC. Using the data converted to the level as a statistic, the TV microcomputer 21 controls the video signal processor 22 by changing the sharpness value.

That is, in the TV micom 21, when the DC level is high from the blocking detection unit 30, the sharpness value is lowered, and when the DC level is low from the blocking detection unit 30, the sharpness value is increased.

In the meantime, the image signal processor 22 processes the luminance and color signals output from the video decoder 12 according to the sharpness value set by the TV microcomputer 21 and displays them on the screen of the CPT 23.

In addition, DVD has high resolution and high throughput per second. Blocking noise (BLOCKING NOISE) which can occur when restoring data compression (separates data into 8 * 8 units when compressing image data. Since this block does not appear on the screen), the sharpness value is set high. On the other hand, in the case of VIDEO-CD, the blocking noise is frequently changed according to the encoding state of the signal source because the information processing capacity is low. It appears that the blocking noise is a high frequency component and appears a lot on a bright screen, and if the sharpness value is reduced, the blocking noise can be removed on the screen.

In the composite TV system incorporating the present invention with a DVD player, the image quality control device and method do not generate blocking noise in the case of a DVD. Therefore, the sharpness value is set high and in the case of a VIDEO-CD, according to the blocking degree of a signal source. By changing the sharpness value, the blocking noise appearing on the screen is removed to achieve the optimum image quality.

Claims (3)

A DVD player for decoding and outputting a video signal recorded on a DVD or a VIDEO-CD, and a blocking for detecting a signal source state of a VIDEO-CD video signal output from the DVD player and outputting the detected signal to the TV microcom 21. The display unit comprises a TV display unit for changing the sharpness value according to the detection result of the blocking detection unit and displaying a video signal decoded by the DVD player on a CPT screen. controller. The diode of claim 1, wherein the blocking detector comprises: an HPF for passing only high frequency components of the luminance signal output from the video decoder; an amplifier for amplifying the high frequency signal passing through the HPF; and a diode for rectifying the signal amplified by the amplifier. And a phase and a resistor and a capacitor for converting the signal rectified by the diode into a DC voltage, a synchronous separator for separating only the synchronous signal from the luminance signal output from the video decoder, and a synchronous signal separated from the synchronous separator. And a phase inversion unit for inverting and a transistor turned on / off by a synchronous signal inverted in phase from the phase inversion unit. A first step of determining whether the current mode selected by the user is a TV mode, a DVD mode, or a video-CD; and if the determination result is a DVD, a second step of setting the sharpness value to a predetermined value corresponding to the DVD in the TV micom; If the result of the first step is VIDEO-CD, the third step of setting the sharpness value in inverse proportion to the number of blocking per field by checking the blocking detection unit in the TV micom, The third process includes a variable range setting process for setting a variable range of sharpness suitable for the VIDEO-CD mode, an initial setting process for setting a sharpness initial value of the VIDEO-CD mode to a value within the variable range, and a detection signal of the blocking detection unit. A blocking signal checking process for checking a level and a sharpness adjustment process for adjusting a sharpness value inversely proportional to a detection signal.

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