JP2002252792A - Video device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video device that can take effective countermeasures against a scene with a strong optical stimulus attended with rapid blinking. SOLUTION: A DC component of a luminance is detected for a prescribed period in data detection zones set in a screen to obtain a change in each DC component. The change in each DC component is compared with a reference value to detect the scene with a strong optical stimulus. The detection of the scene is warned on the screen. The scene is displayed by weakening the optical stimulus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video device such as a DVD player for displaying or reproducing a moving image, and more particularly to a video device capable of detecting a scene with strong optical stimulation.

[0002]

2. Description of the Related Art In the field of video software, there is a strong tendency to frequently use video expressions in which the background flickers due to strong light or to frequently use scenes in which a specific color flashes violently, in order to obtain stimulus. On the other hand, however, it has been considered that such highly photostimulable scenes may cause light-sensitive epilepsy, and this problem is an exception even in DVD players that reproduce and display digital moving images. Absent.

[0003]

In response to such a problem, there has been a movement to request the software production side to refrain from strongly stimulating scenes. In television broadcasting, attention is also given to danger on the screen. In addition, guidelines are being formulated. However, the risk of inducing light-sensitive epilepsy is still small, as none of these measures is fundamental.

However, a flicker preventing apparatus for an image acquisition system which eliminates flicker caused by flickering of illumination used in video shooting (see Japanese Patent Application Laid-Open No. 10-178561) converts an image signal into an RGB digital signal. An LED display device that reduces noise generated during the conversion process and prevents dots from flickering in low gradation display (see JP-A-2000-112434)
Is disclosed, but it is impossible at all to solve the above problem.

[0005] The present invention has been made in view of the above circumstances, and is capable of taking effective measures against a scene with strong optical stimulation regardless of the contents of a video source. It is intended to provide a video device with high performance.

[0006]

According to the present invention, there is provided a video apparatus for displaying or reproducing a moving image, comprising: means for extracting a plurality of partial image data set in a screen at a predetermined cycle; Means for detecting a luminance and / or hue level from the plurality of extracted image data, and comparing the detected luminance and / or hue level with the previously detected luminance and / or hue level, A means for calculating the amount of change and a means for comparing the calculated amount of change with a reference value and detecting a moving image having strong photostimulability based on the comparison result are provided.

[0007] In the video device according to the present invention, the luminance and / or hue levels at a plurality of locations set in the screen are detected at a predetermined cycle, and the amount of change is calculated.
That is, a change in luminance and / or a change in hue at a plurality of positions in the screen are detected. Accordingly, a moving image with strong optical stimulus that is accompanied by intense blinking and has a risk of inducing light-sensitive epilepsy is detected.

When a moving image with a strong optical stimulus is detected, as a countermeasure, a moving image in which a change in luminance and / or hue is suppressed can be displayed or reproduced. In addition, the user can be notified of the fact.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a video device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the video device, FIG. 3 is an explanatory diagram of luminance detection, and FIG.

The video apparatus according to the present embodiment is a DVD player for reproducing and displaying a digital moving image. As shown in FIG. 1, this video device has a DVD as a video source.
The optical pickup unit 30 includes a motor 20 that rotates the optical disk 10, an optical pickup unit 30 that extracts video data from the DVD 10, and an image reproduction unit 40 that converts video data extracted from the DVD 10 by the optical pickup unit 30 into a video signal.

The motor 20 and the optical pickup unit 30 are
The operation is controlled by the microcomputer 50 through the control circuit 60. The microcomputer 50 also performs various processes on the video data by controlling the image reproducing unit 40. A video signal output from the image reproducing unit 40 after being subjected to various processes is sent to a display (not shown).

In the video apparatus according to this embodiment, as a part of video data processing by the microcomputer 50,
A digital moving image with strong optical stimulus, such as repeated intense blinking, is detected. This detection operation will be described with reference to FIG.

In step 1, the image data of the Nth frame is partially captured. FIG. 3 is an image diagram of capturing image data. As shown in the figure, data detection zones corresponding to microblocks are set at a plurality of locations on the screen. In step 1, microblock data B1, B2, and B3 of each zone are stored in a buffer. The capture of the image data is performed every predetermined number of frames, that is, at a constant period, and is performed every six frames in FIG.

When the microblock data at a plurality of locations has been fetched, a DC component of luminance is sampled for each image data in the buffer in step 2 and stored in a memory. When the sampling of the luminance data (DC component) is completed, the difference is calculated in step 3 by comparing the sampled data with the previous sampled data taken in from the same position. That is, in a plurality of data detection zones,
The amount of change in luminance (DC component) over time is calculated.

When the change amount of the luminance (DC component) is calculated, the change amount is compared with a reference value (here, an allowable upper limit value) in step 4. If the change amount is smaller than the allowable upper limit, the digital moving image is normally reproduced and displayed as a digital moving image having no problem (step 5). If the amount of change is larger than the allowable upper limit value, a warning message is displayed on the screen assuming that a digital moving image having a problem of repeated intense blinking in a short time is detected (step 6).

FIG. 4 shows the change over time of the luminance (DC component) with and without a problem.
Usually, the change is slight as shown in FIG. However, depending on the video source, there may be a scene with repeated intense blinking, and in such a scene, as shown in FIG. 4B, the luminance (DC component) changes sharply at a high level in a short time. . If left unchecked, the user is at risk of causing light-sensitive epilepsy. However, in the video device according to the present embodiment, the brightness (DC component) of the microblock is detected at a fixed period, and the amount of change is evaluated, so that a digital moving image that may cause light-sensitive epilepsy is detected. You.

By detecting the AC component of the luminance, it is possible to detect a moving image which blinks temporarily. However, in the case of the AC component, the absolute amount of the luminance level is not grasped. In detecting the moving image in question, the absolute level of luminance is important, and intense blinking at a high luminance level causes physiological problems such as epilepsy. Therefore, detection of the DC component is particularly effective.

Further, when a change in the brightness of the entire screen is detected, the brightness is averaged, so that it is difficult to effectively detect the moving image in question. By detecting a partial luminance change on the screen, effective detection of the moving image in question becomes possible.

When a moving image having a problem that may cause light-sensitive epilepsy is detected, a warning message is displayed on the screen during the detection period, so that the problem can be reduced. The problem can be completely solved by displaying a moving image while reducing the change in luminance during the detection period of the moving image in question or by displaying the moving image with the luminance being limited to the limit or less. In this case, it is preferable to perform a filtering process or the like on the image data of the moving image.

In the above embodiment, the luminance change of the moving image is detected. However, by detecting and comparing the hue level together with or instead of this, more accurate detection becomes possible, and The detection of the DC component is also effective for

The video apparatus according to the present invention can be applied not only to a DVD player or the like but also to a laser disk player and also to a television receiver for displaying a moving image. is there.

[0022]

As described above, in the case of the video apparatus according to the present invention, the level change of the luminance and / or the hue at a plurality of positions in the screen is detected, and the light-sensitive epilepsy is induced with intense blinking. A moving image with a strong optical stimulus that may be dangerous is detected. For this reason, it is possible to take a highly effective countermeasure such as displaying a moving image with a strong optical stimulus while suppressing changes in luminance and / or hue. As a result, not only the light-sensitive epilepsy is prevented, but also the comfort is improved by eliminating an unpleasant blinking scene, and further, the reliability and the sense of security for the image apparatus are improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a video device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the video apparatus.

FIG. 3 is an explanatory diagram of luminance detection.

FIG. 4 is an explanatory diagram of a change in luminance.

[Description of Signs] 10 DVD (video source) 20 motor 30 optical pickup unit 40 image reproduction unit 50 microcomputer 60 control circuit

Claims (4)

[Claims] 1. A video device for displaying or reproducing a digital moving image, means for extracting a plurality of partial image data set in a screen at a predetermined period, and a luminance and / or luminance value based on the extracted plurality of image data. Or a means for detecting the DC component of the hue, and comparing the DC component of the detected luminance and / or hue with the DC component of the previously detected luminance and / or hue to calculate the amount of change in the DC component Means for comparing the calculated amount of change with a reference value, and detecting a digital moving image with strong photostimulation based on the comparison result; and And / or means for displaying or reproducing the digital moving image in which the change in hue is suppressed. 2. A video apparatus for displaying or reproducing a moving image, means for extracting a plurality of partial image data set in a screen at a predetermined period, and a luminance and / or luminance value based on the extracted plurality of image data. Means for detecting the hue level, means for comparing the detected luminance and / or hue level with the previously detected luminance and / or hue level, and calculating the change amount thereof; An image apparatus, comprising: means for comparing a change amount with a reference value and detecting a moving image having strong photostimulation based on the comparison result. 3. When a moving image with a strong optical stimulus is detected, the moving image whose luminance and / or hue change is suppressed is displayed or reproduced. The imaging device according to the above. 4. The video apparatus according to claim 2, wherein when a moving image having a strong optical stimulus is detected, the fact is notified.