JP3357846B2 - Television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a television receiver.

[0002]

2. Description of the Related Art Shooting effects often used in movies, dramas, animations, and video games sometimes generate scenes with strong light stimuli, which can cause children who are sensitive to light stimuli to fall ill. May be. Examples of scenes with strong light stimulation include an image in which red and blue lights blink alternately, an image in which a bonfire pops out, and an image in which the sun is reflected on the lake surface and the like.

Conventionally, there is no television receiver that automatically detects such a scene with a strong light stimulus and takes some measures.

[0004]

SUMMARY OF THE INVENTION The present invention provides a television receiver capable of automatically detecting a scene with a strong light stimulus, converting the scene to a weakly light stimulus, and issuing a warning. The purpose is to do.

[0005]

A first television receiver according to the present invention has a strong red screen and a strong blue screen.
When detecting a scene that alternates between faces
First means for outputting a first detection signal, and a bright screen
And dark scenes are detected repeatedly
A second means for outputting a second detection signal,
Scenes in which the screen changes rapidly in brightness
A third means for outputting a third detection signal when outputting
Detection means comprising: the first detection signal; the second detection signal;
And the third detection signal is output.
For lowering the contrast of the displayed image when
And characterized in that:

A second television receiver according to the present invention alternates between a strong red screen and a strong blue screen.
When detecting a scene to return, the first detection signal
The first means for outputting the signal, the bright screen and the dark screen
When detecting a repeated scene, the second detection
A second means for outputting a signal;
When detecting scenes with repeated intense screens
And a third means for outputting a third detection signal.
Means, said first detection signal, said second detection signal,
Displayed when any of the third detection signals is output.
Means for blacking out the display image .

A third television receiver according to the present invention alternates between a strong red screen and a strong blue screen.
When detecting a scene to return, the first detection signal
The first means for outputting the signal, the bright screen and the dark screen
When detecting a repeated scene, the second detection
A second means for outputting a signal;
When detecting scenes with repeated intense screens
And a third means for outputting a third detection signal.
Means, said first detection signal, said second detection signal,
A warning is issued when any of the third detection signals is output.
Means for displaying a notification message .

[0008]

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration of a main part of a television receiver.

The television receiver includes a signal processing circuit 1 and a display 2 for displaying a video signal from the signal processing circuit 1.
And a detection circuit for automatically detecting a scene with a strong light stimulus and controlling the signal processing circuit 1. The detection circuit automatically detects a scene with a strong light stimulus based on the RGB signals obtained by the RGB separation unit 11 in the signal processing circuit 1.

The RGB obtained by the RGB separation unit 11
The signal is sent to the level determination unit 21. Level discriminator 2
1, as shown in FIG. 2, for each signal of RGB,
The signal level is set to two thresholds (LOW threshold and H
IGH threshold) and three levels (LOW,
MIDDLE, HIGH). The level determination data is represented by two bits. For example, "00" is LO
W, “01” is MIDDLE, “11” is HIGH
Assigned to.

The level discrimination data for the image data for three screens, one for each of RGB, is stored in the memory 21a.
Is stored in NTSC has an effective screen size of 480 vertical
Since the number of pixels and the width are 720 pixels, the memory amount required for the memory 21a is 480 × 720 × 3 in the case of NTSC.
× 2 = 255200 bytes.

Therefore, the level discrimination data for each of RGB is blocked by the blocking circuit 22. For example, in NTSC, the effective screen size is 48
Since there are 0 pixels and 720 horizontal pixels, as shown in FIG.
One screen is divided into 10 vertically and 15 horizontally, and
What is necessary is just to divide into 0x15 blocks.

The reason why the blocking is performed is as follows.
This is because the efficiency of discriminating whether a scene is strongly stimulated by light is improved by processing one screen in blocks of about several tens of pixels in each of the vertical and horizontal directions.

FIGS. 4A to 4D show examples of level discrimination data for one block of the R signal, for example. 4A shows an example of level discrimination data for an ordinary image, FIG. 4B shows an example of level discrimination data for a low-level image, and FIG. 4C shows an example of level discrimination data for a high-level image. FIG. 4D shows an example of level discrimination data for an image whose luminance changes drastically, respectively.

From the blocking circuit 22, R
Level determination data for each of GB is output.
The level determination data for each of RGB for each block from the blocking circuit 22 includes a red / blue screen determination and periodicity determination unit 23, a white / black screen determination and periodicity determination unit 2
4, and luminance change screen discrimination and periodicity discrimination unit 25
Sent to Each of the determination units 23, 24, and 25 includes a memory 23
a, 24a and 25a.

Red / blue screen discrimination and periodicity discrimination section 23
Determines whether each block is a red screen, a blue screen, or another screen, and stores the determination result data (red / blue screen determination result data: 2 bits) in the memory 23a. To be stored. That is, in the block, R
If there are a predetermined number or more of pixels in which the level of R is high and the levels of G and B are low, the block is determined to be a red screen. In the block, RGB
If there are a predetermined number or more of pixels having a high B level and low R and G levels, the block is determined to be a blue screen.

The memory 23a stores, for example, red / blue screen determination result data for each block of 30 frames. If there is a block in which the red screen and the blue screen alternately repeat a predetermined number of frames or more based on the determination result data for each block for 30 frames, it is determined that the scene is strongly stimulated by light. Then, the determination result is output to the OR circuit 26.

White / black screen discrimination and periodicity discrimination section 24
Is a white screen (bright screen) for each block,
It is determined whether the screen is a black screen (dark screen) or another screen, and the determination result data (white / black screen determination result data: 2 bits) is stored in the memory 24a. That is, when there are a predetermined number or more of pixels having a high RGB level in a block, the block is determined to be a white screen. If there are a predetermined number or more of pixels with low RGB levels in a block, the block is determined to be a black screen.

The memory 24a stores, for example, white / black screen determination result data for each block of 30 frames. Based on the determination result data for each block of 30 frames, if there is a block in which a white screen and a black screen alternately repeat a predetermined number of frames or more, that is, if there is a block that repeats blinking, It is determined that the scene has a strong light stimulus, and the result of the determination is determined by an OR circuit
Output to

Brightness change screen determination and periodicity determination section 25
Determines, for each block, whether or not the screen has a drastic change in luminance, and stores the determination result data (luminance change determination result data: 1 or 2 bits) in the memory 25a. That is, the inside of the block is scanned from left to right and from top to bottom, and the luminance level is changed from HIGH (all the signal levels of R, G, and B are HIGH) to LOW (all the signal levels of R, G, and B are set to LOW). ) Is counted, and if the counted number is equal to or more than a predetermined value, it is determined that the screen has a sharp luminance change.

The memory 25a stores, for example, luminance change determination result data for each block of 30 frames. Based on the determination result data for each block of 30 frames, if there is a block in which a screen with a drastic change in brightness repeats for a predetermined number of frames or more, it is determined that the scene is a strong light stimulus. OR the judgment result
Output to the circuit 26.

The memory capacity required for each of the memories 23a, 24a and 25a is: the number of blocks (= 10 × 15) × the number of bits of discrimination result data (= 2) × 30 frames = (90
00/8) bytes.

The red / blue screen discrimination and periodicity discrimination section 23
If any of the white / black screen discrimination / periodicity discrimination unit 24 and the brightness change screen discrimination / periodicity discrimination unit 25 outputs a discrimination signal indicating that the scene is a strong light stimulus, the discrimination is made. The signal is sent to the signal processing circuit 1 via the OR circuit 26. The signal processing circuit 1 performs signal processing so as to reduce the contrast when a determination signal indicating that the scene is a scene with a strong light stimulus has been sent. Then, when the determination signal indicating that the scene has a strong light stimulus is no longer output, the signal processing circuit 1 returns the screen state to the normal state.

When a discrimination signal indicating a scene with a strong light stimulus is sent to the signal processing circuit 1, the screen is blacked out, the screen is darkened, and a warning message is displayed on the screen. Or you may make it.

[0027]

According to the present invention, a scene with a strong light stimulus is automatically detected and converted into an image with a weak light stimulus.
And be able to issue warnings.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a main part of a television receiver.

FIG. 2 is a schematic diagram for explaining level determination by a level determination unit.

FIG. 3 is a schematic diagram showing a screen image divided into blocks.

FIG. 4 is a schematic diagram showing an example of level determination data for one block of an R signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal processing circuit 11 RGB separation part 21 Level discrimination part 22 Blocking circuit 23 Red / blue screen discrimination and periodicity discrimination part 24 White / black screen discrimination and periodicity discrimination part 25 Brightness change screen discrimination and periodicity discrimination part

Claims (3)

(57) [Claims] 1. A strong red screen and a strong blue screen
When detecting a scene that repeats alternately,
A first means for outputting a first detection signal; a bright screen;
When detecting a scene that repeats a different screen,
A second means for outputting a second detection signal;
Detecting scenes with repeated screens with sharp changes in brightness
A third means for outputting a third detection signal when the
Detecting means, the first detection signal, and the second detection
Signal or the third detection signal is output
Means to reduce the contrast of the displayed image
Television receiver, characterized in that the Eteiru. 2. A strong red screen and a strong blue screen
When detecting a scene that repeats alternately,
A first means for outputting a first detection signal; a bright screen;
When detecting a scene that repeats a different screen,
A second means for outputting a second detection signal;
Detecting scenes with repeated screens with sharp changes in brightness
A third means for outputting a third detection signal when the
Detecting means, the first detection signal, and the second detection
Signal or the third detection signal is output
Sometimes blackout the displayed image
Television receiver, characterized in that there. 3. A strong red screen and a strong blue screen
When detecting a scene that repeats alternately,
A first means for outputting a first detection signal; a bright screen;
When detecting a scene that repeats a different screen,
A second means for outputting a second detection signal;
Detecting scenes with repeated screens with sharp changes in brightness
A third means for outputting a third detection signal when the
Detecting means, the first detection signal, and the second detection
Signal or the third detection signal is output
Means for displaying a warning message at times .