KR20060110632A - Apparatus and method for lessening noise of image in television receiver - Google Patents

Abstract

An apparatus and a method for reducing noise of an image in a television receiver are provided to supply a high quality image by controlling the sharpness and resolution of the image according to the intensity of electric field of a radio frequency signal while processing the image. An A/D converter(220) converts an analog voltage, which is proportional to the intensity of an electric field of the received radio frequency signal, into a digital voltage. An electric field detector(230) detects the electric field of the received radio frequency signal from the converted digital voltage. A controller(240) controls the definition of the image outputted through a screen according to the intensity of electric field of the detected radio frequency signal. An image processor(250) outputs the image signal with controlled definition through the screen.

Description

Apparatus and method for lessening noise of image in television receiver

1 is a block diagram of a television receiver to which the present invention is applied.

2 is a block diagram of an apparatus for reducing noise in an image in a television receiver according to an embodiment of the present invention.

3 is a flowchart of a method for noise reduction of an image in a television receiver according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: TV receiver 110: Tuner

120, 220: Screen 130: Speaker

140, 220: A / D converter 150: video processing unit

160: audio processor 170, 250: image processor

180, 210: amplifiers 190, 240: control unit

200: noise reduction device of the image 230: electric field detection unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and in particular, to reduce noise on a screen by adjusting sharpness and / or sharpness of an image during an image processing process according to an electric field strength of a radio frequency (RF) signal received from a broadcasting station. The present invention relates to an apparatus and a method which can be used.

In addition to the rapid development of science and technology, the multimedia field combining various forms of information such as video and audio has become a digital form of information storage and existence in the rapid development of information and communication. Due to the development of MPEG (Moving Picture Experts Group) technology, which is a compression standard for moving image data to compress digital image data that requires a relatively large amount of data, the size of digital image data is gradually getting smaller. Increasingly, digital video and audio services have been applied to almost all fields such as communication and telecommunications, and digital devices for providing such services have emerged.

Among them, TV occupies an important place as an easy and effective information transmission medium in daily life, and thanks to the digital technology described above, video data and audio data are compressed and transmitted by MPEG technology, which makes a large amount of information faster and more stable. With the advent of digital TV, which can be provided as a video, more broadcasts can be enjoyed more easily at home with clearer picture quality and more vivid sound. In addition, video services in various fields such as sports, movies, and home shopping are provided, and the types and amounts of video services provided by cable broadcasting, video-on-demand video, etc. are being increased. It is generally provided to.

Accordingly, various techniques for adjusting an image signal output through a TV have been developed. For example, Patent Application No. 2002-0050886 describes an image including a sharpness correction circuit for clearly expressing the contour of the image information signal in a display device. A signal control circuit is proposed.

Such a conventional image signal control circuit (the patent application) has a dark and unclear outline when a bright image or a dark image is displayed when an image signal such as a movie or a video is implemented in the image information display device. It provides a correction function for clear compensation. However, in the conventional video signal control path, the display device clearly compensates for the unclear screen, but the noise generated according to the electric field strength of the radio frequency signal received from the broadcasting station, that is, the noise generated in the image on the screen during the weak electric field. There was still a problem of falling sharpness of the image because it can not be removed.

The present invention has been made to solve the above problems, an object of the present invention is to adjust the sharpness and / or sharpness of the image in the image processing process according to the electric field strength of the radio frequency signal received from the broadcasting station to reduce the noise on the screen. An apparatus and a method capable of attenuating are provided.

Another object of the present invention is to provide an apparatus and method for providing a high quality screen to a viewer by attenuating noise on a screen according to an electric field strength of a radio frequency signal received from a broadcasting station.

In order to achieve the above object, the present invention provides a radio frequency signal received from a broadcasting station through a tuner, and displays a noise of an image output on the screen in a television receiver displaying the image signal received through the tuner on a screen. An apparatus for attenuating, comprising: A / D conversion means for receiving an analog voltage proportional to an electric field strength of a received radio frequency signal from the tuner and converting the analog voltage into a digital voltage; Electric field detection means for detecting an electric field of a received radio frequency signal from the digital voltage converted by said A / D conversion means; Control means for controlling the sharpness adjustment of the image output on the screen according to the electric field strength of the received radio frequency signal detected by the electric field detection means; And image processing means for outputting the input image signal to the screen by increasing or decreasing the sharpness of the input image signal under the control of the control means.

The present invention provides a method for attenuating noise of an image output on the screen by a television receiver receiving a radio frequency signal received from a broadcasting station through a tuner and displaying the image signal received through the tuner on a screen. A first step of generating an analog voltage proportional to the electric field strength of the received radio frequency signal when the radio frequency signal is received from the broadcasting station; A second step of converting the analog voltage into a digital voltage; A third step of detecting an electric field of a received radio frequency signal from the digital voltage; And adjusting a sharpness of the image output to the screen according to the detected electric field strength of the received RF signal.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a configuration diagram of a television receiver to which the present invention is applied.

Referring to FIG. 1, the television receiver 100 includes a tuner 110 for receiving a composite video signal transmitted from a broadcasting station and outputting an analog video signal and an audio signal, and a screen 120 for displaying the video signal. A speaker 130 for outputting a sound signal, an A / D converter 140 for converting an analog video signal output from the tuner 110 into a digital video signal, and an A / D converter 140 A video processor 150 for making a digital video signal into a signal form suitable for the screen 120, an audio processor 160 for making a voice signal output from the tuner 110 into a signal suitable for the speaker 130, and a video. An image processor 170 for outputting the image signal output from the processor 150 to the screen 120, an amplifier 180 for amplifying the audio signal output from the audio processor 160 and outputting the amplified audio signal to the speaker 130; , Clothing And a control unit 190 for controlling the reception and output of the video signal.

The tuner 110 receives a composite video signal transmitted through a plurality of channels, and outputs a composite video signal of a channel indicated by the controller 190 to output the received channel. At this time, the tuner 110 outputs an analog video signal included in the composite video signal to the A / D converter 140, and outputs an audio signal to the audio processor 160. In the present invention, to reduce the noise on the screen by adjusting the sharpness and sharpness of the image output to the screen 120 according to the electric field strength of the radio frequency signal received by the tuner 110.

The image processor 170 outputs an image signal output from the video processor 150 on the screen 120 under the control of the controller 190, and controls the size and brightness of the screen. That is, the present invention intends to adjust the sharpness and sharpness of the image in the image processing process of the image processor 170.

When a method of adjusting the sharpness and sharpness of an image according to the technical features of the present invention, that is, the electric field strength of a radio frequency signal, is applied to a television receiver having the above configuration, it is as follows.

2 is a block diagram of an apparatus for reducing noise of an image in a television receiver according to an embodiment of the present invention.

Referring to FIG. 2, the apparatus 200 for noise reduction of an image according to the present invention includes an amplifier 210 for amplifying and outputting a radio frequency signal received from a broadcasting station to the tuner 110, and an electric field strength of the received radio frequency signal. The electric field of the received radio frequency signal from the digital voltage converted by the A / D converter 220 and the A / D converter 220 for receiving an analog voltage proportional to the digital voltage received from the tuner 110 and converted into a digital voltage. A control unit for controlling the sharpness and / or sharpness of the image output to the screen 120 according to the electric field detector 230 for detecting and the electric field strength of the received radio frequency signal detected by the electric field detector 230 ( 240 and the sharpness and / or sharpness of the video signal input from the video processor 150 under the control of the controller 240 to increase or decrease the sharpness and / or the sharpness of the video signal. And a phase processing unit (250).

The amplifier 210 amplifies a radio frequency signal received from a broadcasting station and outputs it to the tuner 110. Since the noise of the screen is generated in the weak electric field of the radio frequency signal, the amplifier 210 amplifies the received radio frequency signal to reduce the noise of the screen. It is to attenuate.

When the tuner 110 outputs an analog voltage proportional to the electric field strength of the radio frequency signal received from the broadcasting station, the A / D converter 220 converts the analog voltage into a digital voltage which is a signal form suitable for the electric field detector 230. Output to the electric field detection unit 230.

The electric field detector 230 detects an electric field of the received radio frequency signal from the digital voltage converted by the A / D converter 220 and outputs the electric field to the controller 240. The higher the digital voltage is, the higher the detected electric field strength is, Conversely, the lower the digital voltage, the lower the detected field strength. In general, the noise of the screen does not occur in a strong electric field having a high electric field strength of the received radio frequency signal, but the noise of the screen is generated in a weak electric field having a low electric field strength of the received radio frequency signal. The noise on the screen is reduced by lowering the sharpness and / or sharpness of the image according to the electric field level.

The controller 240 controls the sharpness and / or sharpness of the image in the image processor 250 as follows according to the electric field strength detected by the electric field detector 230 as follows.

When the electric field of the received radio frequency signal detected by the electric field detector 230 is input, the control unit 240 compares the detected electric field with a predetermined reference electric field strength, and when the detected electric field is high as a result of the comparison, the electric field of the current received radio frequency signal Is classified as a strong electric field. When the radio frequency signal having the strong electric field is received, since the noise of the image output on the screen 120 does not occur, the controller 240 adjusts the sharpness and / or sharpness of the image output from the image processor 250. Do not convert.

However, if the electric field detected is lower than the predetermined reference field as a result of the comparison, the controller 240 classifies the electric field of the current received radio frequency signal into a weak electric field and attenuates the weak electric field level to attenuate the noise of the image generated from the weak electric field. Accordingly, the image processing unit 250 controls to reduce the sharpness and / or sharpness of the image.

In order to adjust the sharpness and / or sharpness of the image in such a manner, in the present invention, the weak electric field level, which is a reference for adjusting the sharpness and / or sharpness of the image, is divided and set in several steps. Sharpness values and / or sharpness values corresponding to a plurality of weak electric field levels were set. Here, the lower the predetermined weak electric field level, the lower the sharpness value and / or the sharpness value corresponding thereto.

As described above, since a plurality of weak electric field levels and sharpness values and / or sharpness values are preset in the control unit 240, the control unit 240 detects when the electric field detected by the electric field detection unit 230 is classified as a weak electric field. The level of the detected weak field is determined by comparing the weak field with a plurality of predetermined weak field levels. When the weak field level is determined as described above, the controller 240 searches for predetermined sharpness values and / or sharpness values to find a sharpness value and / or sharpness value corresponding to the determined weak field level. Subsequently, the controller 240 controls the image processor 250 to lower the sharpness and / or sharpness of the image by the found sharpness value and / or sharpness value.

Accordingly, the image processor 250 lowers the sharpness and / or sharpness of the image signal input from the video processor 150 by the sharpness value and / or the sharpness value transmitted from the controller 240 and outputs the sharpness and / or sharpness to the screen 120.

Meanwhile, although the present invention discloses that predetermined weak electric field level values, sharpness values, and / or sharpness values are set in the controller 240, the present invention is not limited thereto, and further includes a storage medium to provide a predetermined weak electric field in the storage medium. Level values and sharpness values and / or sharpness values may be preset.

The process of adjusting the sharpness and / or sharpness of the image according to the electric field strength of the radio frequency signal received by the television receiver by the noise reduction apparatus of the image having the above-described configuration and function will be described with reference to a flowchart. Is as follows.

3 is a flowchart illustrating a method of noise reduction of an image in a television receiver according to an embodiment of the present invention.

Referring to FIG. 3, first, when a radio frequency signal transmitted from a broadcasting station is received through the tuner 110 (S301), the tuner 110 outputs an analog voltage proportional to the electric field strength of the radio frequency signal received from the broadcasting station. The A / D converter 220 converts the input analog voltage into a digital voltage and outputs the same to the electric field detector 230 (S303).

The electric field detector 230 detects an electric field of the received radio frequency signal from the input digital voltage and outputs it to the controller 240 (S304). When the electric field of the received radio frequency signal is detected in this way, the controller 240 compares the detected electric field with a predetermined reference electric field strength to determine whether the detected electric field is a strong electric field higher than the predetermined reference electric field or the detected electric field is a predetermined reference electric field. It is determined whether the lower weak electric field (S305).

If the detected electric field is a strong electric field, the control unit 240 does not convert the sharpness and sharpness of the image output to the screen 120 (S306).

If the detected electric field is a weak electric field, the controller 240 compares the detected weak electric field with a plurality of predetermined weak electric field levels to determine the level of the detected weak electric field (S307), and then sets predetermined sharpness values and / or The sharpness values are searched to find a sharpness value and / or a sharpness value corresponding to the determined weak electric field level (S308). In addition, the controller 240 controls the image processor 250 to lower the sharpness and / or sharpness of the image by the found sharpness value and / or sharpness value, and the image processor 250 then controls the control unit 240 according to the control. The sharpness and / or sharpness of the image to be output to the screen 120 is lowered (S309).

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention, by adjusting the sharpness and / or sharpness of the image in the image processing process according to the electric field strength of the radio frequency signal received from the broadcasting station to reduce the noise on the screen, to provide a good quality screen It can improve the reliability of the viewer.

Claims (10)

An apparatus for attenuating noise of an image output on the screen by a television receiver receiving a radio frequency signal received from a broadcasting station through a tuner and displaying the image signal received through the tuner on a screen. A / D conversion means for receiving an analog voltage proportional to the electric field strength of a received radio frequency signal from the tuner and converting it into a digital voltage; Electric field detection means for detecting an electric field of a received radio frequency signal from the digital voltage converted by said A / D conversion means; Control means for controlling the sharpness adjustment of the image output on the screen according to the electric field strength of the received radio frequency signal detected by the electric field detection means; And Image processing means for outputting the input image signal on the screen by increasing or decreasing the sharpness of the input image signal under the control of the control means Noise reduction device of the image comprising a. The method of claim 1, The control means, If the electric field of the received radio frequency signal detected by the electric field detection means is a strong electric field higher than a predetermined reference electric field, the sharpness of the image to be output on the screen is not changed. If the electric field of the received radio frequency signal detected by the electric field detecting means is a weak electric field lower than a predetermined reference electric field, controlling the image processing means to lower the sharpness of the image to be output on the screen Damping device. The method of claim 2, And a plurality of weak field level values obtained by dividing the weak field by intensity, and a plurality of sharpness values corresponding to the plurality of weak field levels. The method of claim 3, wherein The control means determines the level of the detected weak electric field according to the plurality of set weak field levels, and then outputs the image to the screen by the sharpness value corresponding to the detected weak field level among the set plurality of sharpness values. And controlling the image processing means to lower the sharpness of the image. The method of claim 3, wherein And the plurality of sharpness values corresponding to the plurality of weak electric field levels are set in the control means. The method of claim 5, The control means determines the level of the detected weak electric field according to the plurality of set weak field levels, and then outputs the image to the screen by the sharpness value corresponding to the detected weak field level among the set plurality of sharpness values. And controlling the image processing means to lower the sharpness of the image. The method according to any one of claims 1 to 6, Amplification means for amplifying a radio frequency signal received from the broadcasting station and outputting the amplified signal to the tuner Noise reduction device of the image further comprising. A method for attenuating noise of an image output on the screen by a television receiver receiving a radio frequency signal received from a broadcasting station through a tuner and displaying the image signal received through the tuner on a screen, A first step of generating an analog voltage proportional to the electric field strength of the received radio frequency signal when the radio frequency signal is received from the broadcasting station; A second step of converting the analog voltage into a digital voltage; A third step of detecting an electric field of a received radio frequency signal from the digital voltage; And A fourth step of adjusting the sharpness of the image output on the screen according to the detected electric field strength of the received RF signal Noise reduction method of the image comprising a. The method of claim 8, The fourth step, A fourth step of comparing the detected electric field with a predetermined reference electric field strength and determining whether the detected electric field is a strong electric field higher than the predetermined reference electric field or whether the detected electric field is a weak electric field lower than the predetermined reference electric field. Stage 1; If the detected electric field is a strong electric field, maintaining the clarity of the image to be output to the screen; If the detected electric field is a weak electric field, determining the level of the detected weak electric field by comparing the detected weak electric field with a plurality of predetermined weak electric field levels; And A fourth step of searching for predetermined sharpness values to find a sharpness value corresponding to the detected weak electric field level, and then lowering the sharpness of the image to be output on the screen by the found predetermined sharpness value Noise reduction method of the image comprising a. The method of claim 9, The fourth step, A fourth step of finding sharpness values corresponding to the detected weak electric field levels by searching predetermined sharpness values, and then lowering the sharpness of the image to be output on the screen by the predetermined predetermined sharpness value Noise reduction method of the image further comprising.

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