JPH0537893A - Television signal recorder and television signal reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce lots of television signals efficiently. CONSTITUTION:The device is provided with an A/D converter section 11, a motion detection section 12 detecting a motion signal of a video image formed based on an inter-frame difference circuit, a moving area size measurement section 13 measuring the size of a moving area in a frame from the obtained motion detection signal, an inter-frame difference arithmetic operation section 14 obtaining an inter-frame difference of the obtained moving area size signal, a comparator section 16 obtaining a scene change detection signal when the obtained inter-frame difference exceeds a reference level set in advance to a level setting section 15, a still picture extract section 2 extracting a still picture at that point of time from the video signal every time the scene change detection signal is received, and a recording section 4 recording the extracted still picture data, its time code and an audio data sequentially as each unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording and reproducing a television signal as a still picture.

SUMMARY OF THE INVENTION According to the present invention, when recording and reproducing a television program, a still image after a scene change point (scene change) of a television program, which usually occurs every several seconds to several tens of seconds, is displayed. Extraction is performed, and the extracted still image data, the data of the time when the still image is extracted, and the audio data are recorded in the recording device. The present invention proposes an apparatus for efficiently recording and reproducing a large amount of television programs by reproducing audio and still images in accordance with the data of the extracted time.

[0003]

2. Description of the Related Art As is well known, television broadcasting is a medium that sends information unilaterally and cannot be seen if the broadcasting time has passed.

As a means for solving this, a method of recording and reproducing on a VTR is used, but this VTR is
You cannot watch a program unless you record the program you want to watch in advance.

Therefore, a VTR capable of programming and recording a program desired to be watched for one week has been conventionally developed.

However, in the conventional consumer VTR, the recording time is about 8 hours at the longest, and it is impossible to record even one day's program as it is.

[0007]

As described above, according to the conventional television signal recording apparatus, since the video signal is recorded as a moving image, the recording of the television program is time-consuming. There was a limit to it.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a television signal recording apparatus and a reproducing apparatus for efficiently recording and reproducing a large amount of television signals.

[0009]

In order to achieve the above object, the television signal recording apparatus of the present invention detects a motion of a video from an input video signal, and the detected motion of the video is a preset reference. Every time the above is reached, still image extraction means for extracting a still image at that point in time from the video signal, extracted still image data, time data when the still image was extracted, and audio data until the next still image extraction. And a recording unit for sequentially recording and as a unit.

In order to achieve the above object, the television signal reproducing apparatus of the present invention is such that still picture data extracted from a video signal, time data when the still picture is extracted, and audio until the next still picture is extracted. Time data extracting means for extracting the time data from a recording means that sequentially records data and one unit, and reproducing means for extracting and reproducing still image data and audio data from the recording means based on the extracted time data. It is characterized by having.

[0011]

According to the above construction, first, the movement of the input video signal is monitored. The time when the movement is above the reference is when the scene changes (scene change), and the video signal at that time is cut out and extracted as a still image. The extracted still image, its time data, and audio data until the next still image is extracted are recorded as one unit.

When extracting a still picture, the still picture and the sound are reproduced with the time data as a key.

Therefore, a large amount of video signals can be recorded and reproduced as natural still images synchronized with the audio signals.

[0014]

1 is a block diagram showing the construction of an embodiment of the present invention, which is a television signal recording / reproducing apparatus. 2 shows the configuration of the television signal recording device, and FIG. 3 shows the configuration of the television signal reproducing device.

In FIG. 1, a scene change detection unit 1
Detects a scene change of the program from the input video signal and generates a scene change detection signal.

The still picture extraction unit 2 extracts a still picture from the video signal each time a scene change detection signal from the scene change detection unit 1 arrives.

The time code generator 3 detects a time when a still picture is extracted from a built-in clock or time data supplied from the outside, and generates a time code necessary for reproducing the still picture and the sound.

The recording unit 4 records the time code, the still image signal, and the voice signal packetized through the AD conversion unit 5 and the packet data conversion unit 9 as one unit, and is a VTR or the like. Composed.

Further, the time code reproducing section 6 includes a recording section 4
To reproduce the time code and supply it to the still picture reproducing section 7 and the sound reproducing section 8 to reproduce the still picture and the sound.

As shown in FIG. 2, the scene change detection section 1 is composed of an AD conversion section 11 for converting a video signal into a digital signal, and a motion detection for detecting a video motion signal, which is basically composed of an inter-frame difference circuit. Unit 12, a moving region size measuring unit 13 that measures the size of a moving region in a frame from the obtained motion detection signal, and an interframe difference calculation unit 1 that obtains an interframe difference of the obtained moving region size signal
4 and when the obtained inter-frame difference value exceeds the reference level set in advance in the level setting unit 15, a scene change detection signal is generated and supplied to the still image extraction unit 2 and the time code generation unit 3. The comparison unit 16 is provided.

Next, the operation of this embodiment will be described with reference to the time chart of FIG.

The video signal from the TV signal demodulation section is converted into a digital signal by the AD conversion section 11 and supplied to the motion detection section 12. The motion detection unit 12 monitors the digital video signal for one frame, obtains the difference from the digital video signal for the previous one frame, and supplies it as a motion signal to the moving region size measurement unit 13.

The moving area size measuring unit 13 measures the size of the moving area in the frame from the supplied motion signal.
Next, the inter-frame difference calculation unit 14 obtains the inter-frame difference of the measured motion area size signal, and compares this difference value with a preset reference level. As a result of the comparison, when the motion area size signal exceeds the reference level, it is determined that a scene change in the video signal has been made, and FIG.
The scene change detection signal A shown in (A) is output to the still image extraction unit 2 and the time code generation unit 3.

When the scene change detection signal A is supplied, the still picture extraction unit 2 cuts out the still picture E _A at that time from the video signal, as shown in FIG. 4 (B).

When the scene change detection signal A is supplied, the time code generator 3 encodes the time data at that time to generate the time code T _A.

Furthermore, after the audio signal is converted into a digital audio signal by the AD conversion unit 5, the period from the rising of the scene change detection signal A to the rising of the next scene change detection signal B is converted by the packet data conversion unit 9. It is packetized as one unit and becomes a packet voice signal P _A (see FIG. 4D).

The time code T _A , the still image signal E _A and the packet audio signal P _A are recorded as one recording signal M _A as shown in FIG. 4 (C).

Similarly, when the next scene change detection signal B is output, its time code T _B and still image signal E _B
And the packet audio signal P _B are recorded in the recording unit 4 as one recording signal.

In this way, each time a scene change, which is a change point of a program, is detected, the video signal at that time is extracted as a still image, so that a large amount of video signal can be displayed without disturbing the viewer's understanding of the video content. It can be recorded efficiently.

On the other hand, in reproducing the television signal recorded in the recording unit 4 as described above, first, the recording signal M _A by the time code extraction unit 61, M _B, ... time code from T _A, T _B, to extract ..., the time code T _a, T _B, ... are supplied to the still image extraction time reproducing section 62 and the audio extraction time reproducing section 63. The still image extraction time reproduction unit 61 generates a time code for still image reproduction and supplies it to the still image extraction unit 71 and the frame memory 72. The still image extraction unit 71 supplied with the time code extracts a still image from the corresponding recording signal from the recording unit 4 using the time code as a key and supplies the still image to the frame memory 72. The DA converter 73 converts the still image signal stored in the frame memory 72 into an analog signal and outputs it to a display device (not shown).

The voice extraction time reproducing section 63 also generates a voice reproduction time code and supplies it to the voice data extracting section 81. Audio data extraction unit 8 supplied with time code
1 outputs an audio signal from the corresponding recording signal from the recording unit 4 using the time code as a key and supplies it to the DA conversion unit 82. The DA converter 82 converts the supplied digital audio signal into an analog audio signal and then outputs the analog audio signal to an audio device (not shown). By repeating the above-described series of reproduction processing, a large amount of television signals can be reproduced.

[0032]

As described above, according to the present invention, when the motion of the video signal in the television signal exceeds the reference level, the video at that time is cut out and recorded as a still image. A large amount of television signals can be efficiently recorded and reproduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a television signal recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is a block diagram showing a configuration of an embodiment of a television signal recording device according to the present invention.

FIG. 3 is a block diagram showing a configuration of an embodiment of a television signal reproducing device according to the present invention.

FIG. 4 is a time chart illustrating a recording process according to an embodiment of the present invention.

[Explanation of symbols]

1 Scene change detector 2 Still image extraction unit 3 Time code generator 4 recording section 5 AD converter 6 Time code playback section 7 Still image playback section 8 audio playback section 12 Motion detector 13 Moving area size measurement unit 14 Frame difference calculation unit 15 Level setting section 16 Comparison section

Claims (2)

[Claims] 1. A still image in which a motion of a video is detected from an input video signal, and a still image at that time is extracted from the video signal each time the detected motion of the video exceeds a preset reference. A television set comprising: an extracting unit; and a recording unit that sequentially records the extracted still image data, time data when the still image is extracted, and audio data until the next still image is extracted as one unit. John signal recorder. 2. The time data is extracted from a recording means that sequentially records still image data extracted from a video signal, time data when the still image is extracted, and audio data until the next still image is extracted as one unit. A television signal reproducing apparatus, comprising: time data extracting means for reproducing the still image data and audio data from the recording means on the basis of the extracted time data.