KR100247086B1 - Contrast control device of image signal - Google Patents

Abstract

The present invention relates to a contrast control apparatus for a video signal by a multi-screen split method, comprising: a sampling unit (44) for sampling a main contrast-adjusted luminance signal into a plurality of screen regions, and a contrast-modulated luminance signal of the sampling result. A modulator 46 to modulate, a sub-contrast adjuster 48 to adjust the modulated luminance signal for each of a plurality of screen regions, and the sub-contrast adjusted luminance signal to be applied to R / G / B color matrix processing of color signals. A reference timing data storage unit 60 and a reference counter data storage unit for applying the demodulation unit 50, means for setting a screen region of a contrast level adjustment target among the plurality of screen regions, and a screen region of the target contrast level adjustment target CP for judging from the position data stored in 62 and controlling the contrast by the sub-contrast adjusting section. The contrast level is adjusted only for the ID detection screen area included in the video IF signal or the screen area set by the remote controller.

Description

Contrast Control Device of Image Signal by Multi-Screen Division Method

The present invention relates to an apparatus for controlling the contrast of an image signal using a multi-screen split method. More specifically, the image of the CRT apparatus can be virtually divided into multiple screen areas in the horizontal and vertical directions, whereby contrast of only a specific screen area can be adjusted. A contrast control apparatus for a video signal by a multi-screen splitting scheme is provided.

In general, a CRT apparatus is provided as an essential component in a television representing an image processing system as a means for reproducing a color image screen, and such a CRT apparatus is a broadcast image signal or an external image processed in an image processing system of a television. The screen is displayed in consideration of the reference contrast level or the contrast level of the adjustment amount set by the viewer.

1 is a view showing an exemplary configuration of an apparatus for adjusting a contrast of a video screen applied to a general television, and a horizontal drive applied from a horizontal drive so that a video signal reproduced during operation of the television is reproduced in a CRT apparatus (not shown). A damper circuit portion 12 (consisting of a diode 14 and a capacitor 16) is connected to the collector side of the horizontal output transistor 10 for switching ON / OFF in response to a signal, and a horizontal deflection coil 18 is connected. A flyback transformer 20 generating various voltages is connected to the rear of the horizontal deflection coil 18 at the collector side of the horizontal output transistor 10. In the flyback transformer 20, an automatic luminance of the CRT device is applied. An automatic brightness limit (ABL) signal is also obtained.

The ABL signal is connected to a control unit 22 that controls the overall function of the corresponding television, and the control unit 22 controls the ABL signal based on an externally set contrast (or luminance) control signal CS. The current contrast level is determined on the basis of the level so as to control the set contrast level and brightness level.

Therefore, according to the contrast control apparatus of the conventional video screen shown in FIG. 1, when the viewer applies the contrast / luminance control signal CS having a predetermined level to the controller 22, the controller 22 outputs a horizontal output. In response to switching ON / OFF of the transistor 10, the level of the ABL signal obtained from the flyback transformer 20 is received and an adjustment signal of contrast (CONTRAST; and / or brightness) for the CRT device is received. And the contrast of the video screen displayed on the CRT apparatus is adjusted to the set value.

However, according to the contrast control of the conventional video screen illustrated in FIG. 1, the contrast (and / or luminance) of the image displayed on the CRT apparatus at the level set by the control signal CS input externally is controlled. Although the contrast level adjustment is applied evenly over the entire part of the picture screen, the polarization component is projected on the left or right side of the CRT apparatus, or the contrast level is relatively low in a certain part of the picture screen. In this case, the visual effect on the portion where the polarization component is projected or the image screen of relatively low contrast level is considerably degraded, and the content of the image image of relatively low contrast cannot be accurately understood. In the state, viewers usually use contrast (luminance) Thereby increasing but, in that case increased the overall contrast of the image screen is the overall luminous on the screen to be deteriorated.

In recent years, when a relatively high luminance polarization component is projected from the left or right side of the CRT apparatus, the peripheral illuminance is detected in such a manner as to improve the visual acuity of the video screen, and the detected roughness CRT apparatus is high. Partially half-blanking processing is performed on the video screen (24a in FIG. 1b; 24b in FIG. 1b) on the screen (24 in FIG. 1 (b)). Although the method of carrying out is also considered, the half blanking processing method incurs a disadvantage in that the original video is reversed as a specific color signal is added to the video signal.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when an ID code indicating a change in contrast level for a specific screen area is detected by virtually dividing a video screen on a CRT device into multiple screen areas in the vertical / horizontal direction, the screen area is displayed. It is an object of the present invention to provide an apparatus for controlling contrast of an image signal by a multi-screen splitting method that automatically compensates a contrast level of an approximation to a contrast level of an adjacent screen region.

In order to achieve the above object, according to a preferred embodiment of the present invention, at least the luminance / color signal separation unit for separating the luminance / color signal from the image IF signal from the IF processing module, and by TINT adjustment of the separated color signal, R / G / In a television equipped with a color matrix processed with a B color component and a main contrast control unit for adjusting contrast of the luminance signal by an external contrast control signal, sampling for sampling the main contrast-adjusted luminance signal into a plurality of screen areas. And a modulator for modulating the contrast modulated luminance signal of the sampling result, a sub-contrast controller for adjusting the modulated luminance signal for each of a plurality of screen areas, and the sub-contrast-controlled luminance signal of the color signal. / B demodulation unit to be applied to the color matrix processing, the cone of the plurality of screen areas Means for setting the screen area of the last level adjustment target, and determining the screen area of the set contrast level adjustment target from the position data stored in the reference timing data storage unit and the reference counter data storage unit to adjust the contrast by the sub-contrast control unit. The sub-contrast control unit includes a plurality of first to fourth horizontal / vertical screen area contrast controllers corresponding to the multi-divided screen area. A contrast control device is provided.

1A is a block diagram of a contrast control apparatus for a video screen according to a conventional example;

1B is a view showing an on-screen display half blanking processing state by a contrast control apparatus for a video screen according to a conventional example;

2 is a block diagram showing the configuration of an apparatus for controlling a contrast of a video signal by a multi-screen splitting method according to an embodiment of the present invention;

3 is a view for explaining the operation of the contrast control apparatus of the video signal by the multi-screen split method according to an embodiment of the present invention.

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

10: horizontal output transistor, 20: flyback transformer,

30: IF processing module, 32: luminance / color signal separator,

34, 40: analog-to-digital converter, 36: TINT controller,

38: color matrix, 42: main contrast control unit,

44: sampling part, 46: modulation part,

48: sub-contrast controller, 50: demodulator,

52: ID detection unit, 54: horizontal timing detection unit,

56: horizontal count detection unit, 58: CPU,

60: reference timing data storage, 62: reference count data storage.

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

FIG. 2 is a block diagram showing an apparatus for controlling a contrast of a video signal according to a multi-screen split method according to a preferred embodiment of the present invention. In FIG. 30, reference numeral 30 denotes a broadcast signal of a channel tuned by a tuner (not shown). Denotes an IF processing module for converting the signal into a predetermined IF (Intermediate frequency) signal, and 32 denotes a luminance / for separating the luminance signal Y and the color signal C from the IF signal processed by the IF processing module. A color signal (Y / C) separation unit is shown, 34 denotes an analog-digital conversion unit for digitally converting the color signal (C), and 36 denotes the digital signal which has been digitally converted based on the TINT control signal (TINT) provided by a controller to be described later. A TINT control unit for adjusting the TINT for (C) is shown, and 38 represents a color matrix for generating color components (R / G / B) based on the luminance signal (Y) which describes the TINT adjusted color signal described later.

40 denotes an analog-digital conversion unit for digitally converting the luminance signal Y separated by the luminance / color signal separation unit 32, and 42 denotes the analog signal based on the contrast control signal CONT applied by the controller to be described later. A main contrast control unit for adjusting the contrast of the digitally converted luminance signal, 44 represents a sampling unit for sampling the main contrast control luminance signal in the main contrast control unit 42, 46 is a sampling unit 44 in the A modulator for modulating the sampled luminance signal Y is shown. In addition, 48 indicates a sub-contrast control unit which is connected to the modulator 46 to perform contrast adjustment for each screen area of the CRT device, and the sub-contrast control unit 48 has a horizontal and horizontal picture of the CRT device. The first to fourth sub-contrast controllers 48a to 48d for adjusting the sub-contrast for each screen area when the virtual division is divided into the first to fourth screen areas in the vertical direction. On the other hand, the sub-contrast control section 48 separates the first and fourth horizontal sub-contrast regulators and the first and fourth vertical sub-contrast regulators, each horizontal / vertical, to separate and adjust contrast in each screen area in the horizontal and vertical directions. The contrast controller may be composed of synthesizing means for synthesizing by adjusting the contrast-adjusted luminance signal in the horizontal and vertical directions. Such a sub-contrast control section 48 operates to automatically adjust the contrast level of the screen area to the contrast level of the screen area adjacent to the screen area when a specific screen area is set as the contrast adjustment object, in which case the contrast adjustment. The target screen area is set based on the ID code included in the broadcast signal. On the other hand, the screen area of the contrast adjustment target can be set by the viewer with the remote control, and also the method of adjusting the contrast of the screen area to the level set by the remote control.

In FIG. 2, reference numeral 50 denotes a contrast control signal for the screen area controlled by the first to fourth sub-contrast controllers 48a to 48d of the sub-contrast control unit 48, and as the luminance signal Y. The demodulation part to be applied to the color matrix 38 is shown.

2 and 52, an ID detection unit detects an ID code indicating a sudden change in contrast with respect to a specific screen area included in a broadcast signal, and 54 is a sudden contrast level change detected by the ID detection unit 52. The horizontal of the screen region specified by the ID code in the image IF signal (ie, the image IF signal applied through the ID detector 52) processed by the IF processing module 30 to determine the position of the screen region. A horizontal timing detection unit for detecting the scanning timing is shown, and 56 indicates a horizontal count detection unit for determining the horizontal position of the screen area in which the contrast level is drastically changed. In addition, 58 generally provides a sampling signal for the sampling unit 44 while performing TINT control control for the TINT control unit 36 and contrast control control for the main contrast control unit 42. A screen area of a sharp contrast level change specified by a horizontal timing detection signal from the horizontal timing detection unit 54 and a horizontal count signal from the horizontal count detection unit 56 or a screen area to be set by the remote control. A CPU for judging and controlling sub-contrast adjustment by the sub-contrast adjustment section 48, 60 denotes a reference timing data storage section for determining a division position of the first to fourth screen regions, and 62 denotes the second. 1-indicates a reference counter data storage unit for determining the divided position of the fourth screen area.

Next, the operation of the contrast control apparatus of the screen multi-screen division method according to the present invention will be described in detail with reference to FIGS. 3A to 3C.

First, according to the present invention, a screen of a CRT apparatus displaying an image ('64' in FIG. 3 (a)) is virtually divided into a plurality of screen regions in a horizontal and vertical direction, and the reference timing data storage unit 60 and the The reference count data storage 62 stores position data of each screen area.

In this state, the image IF signal PIF is obtained as the RF signal of the specific channel selected by the viewer is applied from the tuner to the image IF processing module 30 and converted by the IF signal. In the luminance / color signal separator 32, the luminance signal Y and the color signal C are separated. The color signal C is applied to the analog-to-digital converter 34 to be converted into digital data, and then is applied to the TINT controller 36 to apply the TINT control signal TINT according to the TINT control signal TINT applied from the CPU 58. Adjustment is made, and the TINT adjusted color signal is applied to the color matrix 38.

The luminance signal Y is applied to the analog-to-digital converter 40, converted into digital data, and applied to the main contrast controller 42 to the contrast control signal CONT applied from the CPU 58. After the contrast is adjusted, it is applied to the sampling section 44, sampled under the control of the CPU 58, and applied to the modulating section 46, and the luminance signal Y applied to the modulating section 46 is sub-. Is applied to the contrast 48.

In addition, the image IF signal PIF from the IF processing module 30 is applied to the ID detection unit 52 so that ID detection indicating a state in which the contrast level changes abruptly in a specific screen region virtually divided is provided. When the ID detection unit 52 detects an ID code indicating a change in the contrast level in the screen area P of FIG. 3A, the horizontal timing detection unit 54 and the horizontal count detection unit 56 are detected. The horizontal scan timing and the horizontal scan line of the sections a, b, c, and d of the screen area P are performed. That is, the horizontal timing detection unit 54 performs horizontal scanning timing of the screen area P in the horizontal scanning period of the video signal shown in FIG. 3 (b) ('a' and 'b' in FIG. 3 (b)). Section), and the horizontal count detection unit 56 counts the horizontal scan line (the section of 'c' and 'd' in FIG. 3 (c)) of the screen area P and the ID detection unit ( The sharp contrast change portion detected by 52 is detected.

When the position data of the screen area P detected by the horizontal timing detection unit 54 and the horizontal count detection unit 56 is applied to the CPU 58, the CPU 58 stores the reference timing data storage unit 60. And based on the divided data of the screen area P stored in the reference count data storage 62, the screen area P from which the ID is detected is determined, and the sub-contrast for each screen area in the sub-contrast controller 48 is determined. The control signal is applied. Therefore, the second horizontal / vertical screen area contrast controller (e.g., corresponding to the screen area P) of the first to fourth horizontal / vertical screen area contrast controllers 48a to 48b configured in the sub-contrast adjustment unit 48 ( 48b) adjusts the contrast level of the screen area P to be higher or lower.

The luminance signal whose sub-contrast with respect to the screen area P is adjusted is demodulated by the demodulator 50 and applied to the color matrix 38 so that the color signal C has been adjusted in luminance (and contrast) level. The contrast level of the specific screen area is displayed on the CRT apparatus.

According to the present invention, when a viewer designates a screen area for adjusting contrast and sets a contrast level, the CPU 58 sets the position of the designated screen area with the reference timing data storage 60. Judging from the data set in the count data storage unit 62, the horizontal / vertical screen area contrast controller corresponding to the screen area is controlled to control the contrast level of only the designated screen area to the level set by the viewer.

As described above, according to the contrast control apparatus of a video signal according to the multi-screen division method according to the present invention, the video screen displayed on the CRT apparatus is divided into a plurality of screen regions in the horizontal and vertical directions to thereby abruptly change the contrast level. Since the contrast level of only the screen area where the ID indicating is detected or only the screen area designated by the viewer can be adjusted, the adverse effect of vision caused when the contrast level change is abrupt can be excluded, and the screen area having a low or high contrast level can be excluded. As the contrast can be adjusted to an appropriate contrast level, the visibility of a specific screen region can be improved.

Claims (4)

At least, the luminance / color signal separation unit 32 that separates the luminance / color signal from the image IF signal from the IF processing module 30, and the color matrix for processing the R / G / B color component by TINT adjustment of the separated color signal (38). In the television with a main contrast control section 42 for adjusting the contrast with respect to the luminance signal by an external contrast control signal, A sampling unit 44 for sampling the main contrast-adjusted luminance signal into a plurality of screen regions, a modulation unit 46 for modulating the contrast-modulated luminance signal of the sampling result, and a plurality of screen regions for the modulated luminance signal. A sub-contrast control unit 48 for adjusting the respective levels, a demodulation unit 50 for applying the sub-contrast adjusted luminance signal to the R / G / B color matrix processing of the color signal, and adjusting the contrast level among the plurality of screen regions. Means for setting a screen area of a target and judging from the position data stored in the reference timing data storage section 60 and the reference counter data storage section 62 by the sub-contrast control section. Image scene by the multi-screen split method, characterized by having a CPU 58 for controlling the contrast adjustment Of the contrast control apparatus. The display apparatus of claim 1, wherein the sub-contrast controller 48 includes a plurality of first to fourth horizontal / vertical screen area contrast controllers 48a to 48d corresponding to the multi-divided screen area. Contrast control device for video signal by multi-screen division method. 2. The apparatus according to claim 1, wherein the means for setting the screen area of the contrast level adjustment target comprises: an ID detector 52 for detecting an ID representing a sudden change in the contrast level included in the video IF signal, and the ID detected video signal. A horizontal timing detector 54 for detecting a horizontal scan timing of the video signal; and a horizontal count detector 56 for counting horizontal scan lines of the ID-detected video signal; . 2. The apparatus of claim 1, wherein the means for setting the screen region of the contrast level adjustment target is a remote controller, and the CPU controls the sub-contrast level for the screen region to be adjusted to the contrast level for the screen region set by the remote controller. An apparatus for controlling contrast of a video signal according to a multi-screen division method, characterized in that the.

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