KR19980083872A - How to auto adjust sub picture tint - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic tint correction method in a television broadcast receiver having a function of displaying a main screen and a sub-screen on one CRT. A first process of dividing and setting the sub-screen into a predetermined number of areas based on the vertical synchronization signal of the second signal; and a second process of applying a specific tint test signal to the sub-screen signal processing means during a tint test; A third process of detecting tint data of a region corresponding to the sub-screen among the images displayed on the CRT, and detecting the tint data corresponding to each region that has been separated through the first process; A fourth process of comparing each of the area wall tint detection values with a reference tint value corresponding to the tint test signal and calculating a correction value thereof; And a fifth process of correcting, during the sub-screen signal processing, the tint value of each region based on the tint correction value calculated through the fourth process.

Description

How to auto adjust sub picture tint

The present invention relates to a method for automatic tint correction in a television broadcast receiver having a PIP function. In particular, a horizontal / vertical synchronizer and a timing controller operating based on the same can be used to divide the entire screen into a predetermined number of areas. A sub-screen tint automatic adjustment method for allowing tints to be adjusted.

In general, a television broadcast receiver called a TV receives a radio frequency signal transmitted at an arbitrary high frequency from a broadcasting station, and then extracts only a frequency band of a tuned channel, and extracts an intermediate frequency from the extracted broadcast frequency, thereby extracting an audio signal and an image. After the signal is separated, the separated video signal is processed in a predetermined state to provide an image received to the user through the CRT, which is a display means, and the audio signal is filtered and amplified in a predetermined state, and then through a speaker which is an audio output means. Listen to the sound received by the user.

Television broadcast receivers with this function typically have only one tuning section, so that only one channel is displayed on the CRT. Accordingly, PIP (Picture In) is a technology that overcomes these limitations and implements a screen different from the main screen (hereinafter referred to as a sub-screen) on one CRT on the screen (hereinafter, referred to as a main screen) that is originally displayed on the entire CRT. Picture (Picture) and POP (Picture Out Picture) methods have been proposed.

In this case, the POP method is a technique generally applied when displaying an image having an aspect ratio of 4: 3 in a television broadcast receiver having a 16: 9 aspect ratio called a wide vision, whereas the PIP method is a television having an aspect ratio of 4: 3. This technique is applied when displaying an image having an aspect ratio of 4: 3 in a broadcast receiver.

Referring to FIG. 1 attached to a simplified configuration of an image portion of a television broadcast receiver applying the PIP method, a specific channel is selected by receiving a broadcast signal of a plurality of channels transmitted from a broadcasting station through an antenna ANT. The main image processing unit 200A for detecting and outputting an image signal and a horizontal / vertical synchronization signal according to the first and second tuning units 100A and 100B and a broadcasting channel tuned by the first tuning unit 100A. And a sub image processor 200B for reducing the screen to correspond to the area of the set sub-screen after detecting a video signal from the broadcast channel tuned by the second tuning unit 100B and outputting the reduced screen. A mixer 300 for mixing the 200A and the video signal output from the sub image processing unit 200B and transferring the image signal to the CRT driving unit; and controlling the sub image processing unit 200B to control the display area of the sub-screen. A control unit for setting and controlling the image processing accordingly, receiving a vertical synchronous signal (V.sync) output from the main image processing unit 200A, and recognizing it as a reference for tint adjustment, and performing tint adjustment of the input image data. And a level matching unit 400 for matching levels so that the controller 500 can recognize the video signal output from the mixer 300.

The above configuration is a conventional configuration for adjusting the tint on the screen, and the controller 500 applies a specific tint test signal to the main image processor 200A.

Accordingly, the tint level of the image output from the mixer 300 is returned to the control unit 500 through the level matching unit 400, and the vertical synchronization of the main screen is performed by a timing controller (not provided in the control unit), which is not shown. When an interrupt is generated at a certain point of time based on the signal, the controller 500 receives the tint of the pixel output from the level matching unit 400 and compares the measured tint value of the input pixel with the data measured in the main. do.

This method is automatic adjustment method for adjusting the tint before the PIP function is executed. However, if the PIP function is performed, the sub screen exists at a specific position of the entire screen and is small in the area. Adjusting the tint for is difficult to adjust the tint on the subpicture.

Therefore, the conventional tint adjustment method that operates as described above is to some extent automatic tint adjustment for the main screen, but if the tint in the area where the sub-screen is displayed when the PIP function is activated, There was an inconvenience that the user had to manually adjust manually because it could not be adjusted automatically.

An object of the present invention for solving the above problems is a part for adjusting the tint for each area after dividing the entire screen into a predetermined number of areas by the horizontal / vertical synchronization and the timing control unit operating based on the same. It is to provide a method for automatically adjusting the screen tint.

1 is a schematic diagram showing an example of a configuration of an image processing portion in a television receiver having a PIP function;

2 is a flowchart illustrating an operation of automatically adjusting a sub-screen tint according to the present invention.

A feature of the present invention for achieving the above object is a sub picture signal provided in an automatic tint correction method in a television broadcast receiver having a function of displaying a main picture and a sub picture on one CRT. A first step of dividing and setting the sub-screen into a predetermined number of regions based on the vertical synchronization signal of the sub-screen processed by the processing means; and applying a specific tint test signal to the sub-screen signal processing means during a tint test. The main process detects the tint data of the region corresponding to the sub-screen among the images displayed on the CRT through the second process and the third process corresponding to each region that is separated by the first process. And comparing each detected area wall tint value detected through the third process with a reference tint value corresponding to the tint test signal. And a fifth step of calculating the correction value, and a fifth step of correcting the tint value of each region during the sub-screen signal processing based on the tint correction value calculated through the fourth step.

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

The system applied to the present invention is the same as that shown in FIG. 1, but is processed in software by the sub-image processing unit 200B.

FIG. 2 illustrates a process performed by the sub-image processing unit 200B by the sub-screen tint automatic adjustment method according to the present invention.

In step S101, it is determined whether the start signal for the tint test has been received from the controller 500.

Subsequently, when it is determined in step S101 that the start signal for the tint test has been input through the control unit 500, the control unit 500 proceeds to step S102 and inputs the tint test data provided to the main image processing unit 200A by the control unit 500. Receive.

At this time, the sub-image processing unit 200B detects the vertical synchronization signal of the sub-screen processed by the sub-screen in step S103, proceeds to step S104, generates a virtual interrupt at predetermined time intervals, and divides the sub-screen into a predetermined area. Then, the tint value on the current CRT of the region is detected.

At this time, the method of detecting the tint value on the current CRT in step S104 is the same as in the prior art. That is, the signal output from the level matching unit 400 shown in FIG. 1 is input and processed.

Thereafter, the tint detection value for each region is compared with the reference tint value corresponding to the tint test signal, and the correction value is calculated. Then, the tint value corresponding to each region of the sub-screen is corrected based on the calculated tint correction value. Done.

When the subscreen tint automatic adjustment method according to the present invention operates as described above, it is possible to automatically adjust the tint value of the subscreen which has been manually adjusted.

Claims (1)

In the automatic tint correction method in a television broadcast receiver having a function of displaying a main screen and a sub-screen on one CRT, A first step of dividing the sub-screen into a predetermined number of areas based on the vertical synchronization signal of the sub-screen processed by the sub-screen signal processing means; A second step of applying a specific tint test signal to the sub picture signal processing means during a tint test; A third step of detecting tint data of an area corresponding to a sub-screen among the images displayed on the CRT through the second step, and detecting the tint data corresponding to each area of the segmentation determined by the first step; A fourth step of comparing the detected area tint value detected through the third step with a reference tint value corresponding to the tint test signal and calculating a correction value; And And a fifth process of correcting, during the sub-screen signal processing, the tint value of each region based on the tint correction value calculated through the fourth process.