KR20010045703A - Definition compensation apparatus and method for digital television - Google Patents

Abstract

PURPOSE: An apparatus and method for compensating a definition of a digital TV is provided for a user to watch as a color to be displayed by a broadcasting station regardless of the peripheral illumination condition by performing a digital signal process of an image quality correction being considered the peripheral illumination condition in a system requesting a high definition as a digital TV. CONSTITUTION: A digital tuner(100) outputs an intermediate frequency signal created by performing a frequency conversion of a wireless frequency signal of the corresponding channel being received through an antenna(101) when tuning data are inputted. An intermediate frequency demodulator(110) demoduates and outputs the intermediate frequency signal. A VSB receiver(120) outputs only a signal of wanted area out of output signals of the demodulator(110). A TP demultiplexer(130) separates and outputs a digital sound and a video signal from the output signal of the VSB receiver(120). An MPEG decoder(140) performs an MPEG decoding of the digital video signal output from the TP demultiplexer(130). An analog/digital converter(150) receives an analog broadcasting signal(YUV) and converts into a digital signal. An RGB sensor(160) senses the external illumination light and outputs an R,G,B. An analog/digital converter(170) converts the outputs signal(R,G,B) of the RGB sensor(160). A color correction processing unit(180) corrects the image quality and outputs the output signal(Y.Cb,Cr) of the converter(150) and the output signal(Y.Cb,Cr) of the MPEG decoder(140). A video display processor(190) receives the digital broadcasting signal(Y',Cb'Cr') of the color correction processing unit(180) and converts into and outputs an analog video signal(Y,U,V). A video chroma processor(200) receives the output signal(Y,U,V) and displays the signal(Y,U,V) on a CPT(210).

Description

DEFINITION COMPENSATION APPARATUS AND METHOD FOR DIGITAL TELEVISION}

The present invention relates to an apparatus and method for compensating image quality of a digital TV, and more particularly, to an apparatus and method for compensating image quality of a digital TV to compensate for image quality in consideration of a state of ambient light in viewing the digital TV.

In general analog TV, the viewer's eye adapts to the lighting conditions and detects colors different from the actual display color, so that the viewers feel the same color even when the ambient lighting conditions change. Color compensation is performed by including an image quality compensation device that compensates by changing a characteristic of image quality according to a surrounding environment.

Therefore, in digital TV, which has been accelerated in recent years due to the improvement of digital technology, it is necessary to compensate the image quality by equipping the image quality compensation device so that viewers feel the same color as the ambient lighting conditions change as in the conventional analog TV. It is emerging.

1 is a block diagram showing a configuration of an analog TV to which a conventional image quality compensation device is applied, and as shown therein, an illumination light sensor 10 for detecting an external current illumination light; A color sensing processor 20 which receives an output of the illumination light sensor 10 and processes and outputs an ALB signal; An analog / digital converter (30) for converting and outputting the output signals (R ', B') of the color sensing processing unit (20) into digital signals; A microcomputer 40 for comparing illumination light values R ″ and B ″ inputted through the analog / digital converter 30 with a preset value to determine an illumination condition and outputting correction data DATA; A tuner 60 converting the radio frequency signal of the corresponding channel received through the antenna 50 into an intermediate frequency signal and outputting the intermediate frequency signal; A detector 70 for signal-processing the intermediate frequency signal received from the tuner 60 and separating the signal into an audio signal and an image signal; A voice signal processor 80 outputting the voice signal of the detector 70 to the outside through a speaker (not shown); And an image signal processor 90 for correcting the image quality of the detector 70 by using the correction data DATA of the microcomputer 40 and displaying the image signal through the CPT91. It describes the operation process according to the prior art configured in detail.

First, the color sensing processor 20 that receives a signal that detects the current illumination light through the illumination light sensor 10 that detects the external illumination light converts the signal into a signal similar to the ALB signal and outputs the analog signal. The digital converter 30 converts the digital signal and outputs the digital signal to the microcomputer 40.

The microcomputer 40 compares the illumination light values R ″ and B ″ inputted through the analog / digital converter 30 with a preset value to determine an illumination condition to compensate for the image quality according to the current illumination condition. The correction data DATA is output to the image signal processor 90.

Here, the tuner 60 receiving the radio frequency signal of the corresponding channel through the antenna 50 converts it into an intermediate frequency signal and outputs it to the detector 70, and inputs the intermediate frequency signal of the tuner 60. The received detection unit 70 processes the signal and divides the signal into a voice signal and a video signal, and outputs them to the voice signal processor 80 and the video signal processor 90, respectively.

In addition, the audio signal processor 80 receiving the audio signal from the detector 70 is output to the outside through a speaker (not shown), and the image signal processor receives the image signal from the detector 70. 90 corrects the image quality by the correction data DATA input through the microcomputer 40 and displays the image through the CPT 91.

As described above, in converting the analog signal obtained through the illumination light sensor into the Albi signal, which is an analog signal, the error of the Alb signal caused by the error of the component and the power supply supplied to the analog signal is correct. It is very difficult to determine the lighting conditions, and in most cases, the lighting conditions of the room where the TV is actually watched are complex lightings. However, the image quality is corrected by comparing the illumination light values detected by the illumination light sensor with a preset value. There was a problem that can not meet all the lighting conditions.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems. In a system requiring a high-definition such as a digital TV, a digital signal is processed to compensate for the image quality in consideration of the ambient lighting conditions. It is an object of the present invention to provide an apparatus and method for compensating image quality of a digital TV to be viewed in a color to be displayed on a screen.

1 is a block diagram showing the configuration of an analog TV to which a conventional image quality compensation device is applied.

Figure 2 is a block diagram showing the configuration of a digital TV to which the present invention is applied.

3 is a block diagram showing the configuration of a color correction processor in FIG. 2;

4 is a flow chart showing the operation of FIG.

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

100: digital tuner 101: antenna

110: intermediate frequency demodulator 120: residual band receiver

130: Tippy Splitter 140: MPEG Decoder

150,160: analog-to-digital converter 180: color correction processing unit

181: proportional coefficient calculation unit 182: selection unit

183: Algibi conversion unit 184: color compensation

185: inverse transform unit 190: image display processor

200: video chroma processor 210: Siti

A configuration of the present invention for achieving the above object comprises a first analog / digital converter for receiving an analog broadcast signal and converting it into a digital signal; An algibi sensor which senses the external illumination light and outputs it as an algibi signal; A second analog / digital converter for converting the output signal of the Algivy sensor into a digital signal; And a color correction processor configured to sense a change in current external illumination light by an output signal of the second analog / digital converter and to correct and output an output signal or a digital broadcast signal of the first analog / digital converter selected by a broadcast mode. Characterized in that.

In the operation of the present invention, if the broadcast mode is determined and the digital broadcast mode is received, the radio frequency signal is received in the digital mode, and the digital broadcast signal is processed. If the broadcast mode is the analog broadcast mode, the analog radio broadcast is performed in the analog mode. A first step of processing the signal and converting the signal into a digital signal through an analog / digital converter; When the operation of the first step is completed, a second step of displaying the input broadcast signal by color correction processing according to the change of the current external illumination light.

Hereinafter, with reference to the accompanying drawings, the operation and effect of an embodiment of the present invention will be described in detail.

2 is a block diagram showing the configuration of a digital TV to which the present invention is applied. As shown in FIG. 2, an intermediate frequency signal generated by frequency converting a radio frequency signal of a corresponding channel received through an antenna 101 when inputting tuning data is shown. A digital tuner 100 for outputting; An intermediate frequency demodulator (110) for demodulating and outputting an intermediate frequency signal output from the digital tuner (100); A residual band receiver (VSB Receiver) 120 for outputting only a signal of a desired region among the output signals of the intermediate frequency demodulator 110; A TP Demultiplexer (130) for separating and outputting digital audio and video signals from the output signal of the residual band receiver (120); An MPEG decoder 140 for MPEG decoding and outputting a digital video signal output from the TIP distributor 130; An analog / digital converter 150 which receives an analog broadcast signal YUV and converts it into a digital signal; An ALGBI sensor 160 for sensing an external illumination light and outputting an ALGBI; An analog-to-digital converter (170) for converting the output signals (R ', G', B ') of the ALGBI sensor (160) into digital signals; Detects a change in the external illumination light through the algibi signals Rn ', Gn', and Bn 'of the analog / digital converter 170, and outputs the signals Y and Cb of the analog / digital converter 150 according to a broadcast mode. A color correction processor 180 for selecting the output signal Y, Cb, Cr of the MPEG decoder 140 and correcting the image quality thereof and outputting the corrected image quality; A video display processor for receiving the digital broadcast signals Y ', Cb', and Cr 'of the color correction processor 180 and converting them into analog video signals Y, U and V and outputting the same. VD ")190; And a video chroma processor (hereinafter referred to as "VC") 200 which receives the output signals (Y, U, V) of the VD190 and displays them on the Citi 210. .

As shown in FIG. 3, the color correction processing unit 180 detects the ambient illumination light and the predetermined standard light algibi signals Rn, Gn, and Bn. A proportional coefficient calculating unit 181 for calculating an algi ratio proportional coefficient (Ar, Ag, Ab), and calculating a second proportional coefficient (P, K) using the received ratio; A selection unit 182 for outputting corresponding broadcast signals (Y, Cb, Cr) according to whether they are digital broadcasting or analog broadcasting; An algibi conversion unit 183 for converting the digital broadcast signals Y, Cb, and Cr selected by the selection unit 182 into algibi conversion values R, G, and B; Color compensation for outputting the output signal of the ALG ratio conversion unit 183 by color correction using the ALG ratio proportional coefficients Ar, Ag, and Ab of the proportional coefficient calculating unit 181 and the second-order proportional coefficients P and K. Government 184; The inverse transform unit 185 converts and outputs the RG ratio output signals R ', G', and B 'of the color compensator 184 into digital broadcast signals Y', Cb ', and Cr'. An operation process according to the present invention configured as described above will be described in detail with reference to FIG. 4.

First, the ambient illumination light data, which is the basic data of the color correction processing unit 180, is converted from the analog / digital converter 170 obtained by the Al ZiBee sensor 160 to the digital data from the analog / digital converter 170. The conversion is output to the color correction processor 180.

In this case, since some analog broadcast and digital broadcast coexist in the future, the analog signal should be corrected, and thus the image quality correction is performed after converting the analog broadcast signal into a digital data signal like the digital broadcast.

Accordingly, in the case of the digital broadcast signal, the digital tuner 100 receiving the radio frequency signal of the corresponding channel received through the antenna 101 when the tuning data is input is converted into an intermediate frequency signal generated by frequency conversion and outputted. The intermediate frequency demodulator 110, which receives the intermediate frequency signal output from the digital tuner 100, demodulates it and outputs it, and the remaining side band receiver 120 receives the received region of the desired region of the output signal of the intermediate frequency demodulator 110. Output only signal of.

In addition, the TIP divider 130 receiving the output signal of the remaining band receiver 120 separates and outputs the digital audio signal and the digital video signal, and receives the digital video signal output from the TIP divider 130. The MPEG decoder 140 performs MPEG decoding and outputs the MPEG decoder to the color correction processor 180.

Since the selector 182 in the color correction processor 180 is a digital broadcast, it outputs a digital video signal of the MPEG decoder 140 and detects the ambient illumination light. The proportional coefficient calculator 181 which receives the output signals Rn ', Gn', and Bn 'of the analog / digital converter 170 having converted', G ', B') into digital signals, sets the standard light. The Aljibi signals Rn, Gn, and Bn are divided into Equations 1 below to calculate the Aljibi proportional coefficients Ar, Ag, and Ab.

In this case, the standard light ALG ratio signals Rn, Gn, and Bn, which are important in TV signal processing, set the average light of the afternoon when the daylight is clear as a default value.

In addition, the proportional coefficient calculating unit 181 calculates the second proportional coefficient (P, K) by using the calculated Algi ratio proportional coefficients (Ar, Ag, Ab) through the following equation (2).

In addition, the ALG ratio converter 184 receiving the digital broadcast signals Y, Cb, and Cr selected by the selector 182 uses the following equation (3) to determine the ALG ratio converted values (R, G, B). Convert to and print it out.

In addition, the output signals R, G, and B of the ALG ratio converter 183, the ALG ratio proportional coefficients Ar, Ag, and Ab of the proportional coefficient calculating unit 181, and the quadratic proportional coefficients P, K, respectively. The color compensating unit 184 receives the outputted algi ratio signals R ', G', and B 'by color adaptation using Equation 4 below.

In addition, the inverse converter 185 receiving the RG, R ', G', and B 'output signals of the color compensator 184 may use the digital broadcast signals Y', Cb ', Invert the output to Cr ').

Accordingly, the VPD 190, which has received the color broadcast digital broadcast signals Y ', Cb', and Cr ', corrected by the color correction processor 180, converts them into analog image signals Y, U, and V, and outputs them. In addition, the VPC 200 which receives the output signals Y, U, and V of the VPD 190 displays the same on the CPI 210.

In addition, in the case of analog broadcasting, the analog / digital converter 150 that receives the analog video signals (Y, U, V) is converted into a digital signal and output to the color correction processor 180, the analog / digital converter The color correction processing unit 180 receiving the output signals Y, Cb, and Cr of 150 is applied to the external illumination light data Rn ', which is applied through the analog / digital converter 170 in the same manner as in the case of the digital broadcasting. Color correction processing is performed using Gn 'and Bn').

In addition, the VD 190 receiving the color-corrected digital broadcast signal by the color correction processor 180 converts it into an analog signal image signal (Y, U, V) and outputs the VD 190. The VPC 200 that receives the output signals Y, U, and V displays the same on the CPI 210.

As described in detail above, the present invention converts a received broadcast signal into a digital signal irrespective of a broadcast condition, and then applies Bartleson's theory of transforming eye adaptation according to ambient lighting conditions. By compensating for the image quality of the screen, it minimizes the occurrence of errors and satisfies the complex lighting conditions to provide a natural screen to the viewer.

Claims (4)

A first analog / digital converter for receiving an analog broadcast signal and converting the analog broadcast signal into a digital signal; An algibi sensor which senses the external illumination light and outputs it as an algibi signal; A second analog / digital converter for converting the output signal of the Algivy sensor into a digital signal; And a color correction processor configured to sense a change in current external illumination light by an output signal of the second analog / digital converter and to correct and output an output signal or a digital broadcast signal of the first analog / digital converter selected by a broadcast mode. Digital TV image quality compensation device, characterized in that. According to claim 1, wherein the color correction processing unit receives the Al-GiB signal and the predetermined standard light Al-GiB signal that detects the ambient light, calculates the Al-Gi ratio proportional coefficient, and then calculates the second proportional coefficient using the proportion A coefficient calculating unit; A selection unit which outputs a corresponding broadcast signal according to whether it is digital broadcasting or analog broadcasting; An algibi conversion unit for converting the digital broadcast signal selected by the selection unit into an algibi conversion value and outputting the algibi conversion value; A color compensator for color correcting the output signal of the ALG ratio converter by using an ALG ratio proportional coefficient and a second order proportional coefficient of the proportional coefficient calculator; And an inverse converter configured to inversely convert and output the algibee output signal of the color compensator into a digital broadcast signal. The broadcast mode is determined and the digital broadcast mode receives the radio frequency signal in the digital mode, and processes the digital broadcast signal.If the broadcast mode is the analog broadcast mode, the analog radio signal is processed in the analog mode and then the analog / A first step of converting the digital signal into a digital signal and outputting the digital signal; When the operation of the first step is completed, a second step of displaying the input broadcast signal by color correction processing according to the change of the current external illumination light, characterized in that the digital TV. 4. The method of claim 3, wherein the color correction processing comprises: a first step of dividing an ALGBI signal detecting ambient illumination light into an ALGBI signal of a preset standard light to calculate an ALGBI proportional coefficient; A second step of calculating a second proportional coefficient by using the calculated Algi ratio proportional coefficient when the operation of the first stage is completed; A third step of converting an input digital broadcast signal into an AlGeB signal when the operation of the second step is completed; When the operation of the third step is completed, the fourth step of the color correction via the calculated Aljibi ratio coefficient and the second proportional coefficient after converting the digital signal to the digital broadcast signal, characterized in that it comprises a fourth step Image quality compensation method of digital TV.