JP2993464B2 - Image recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus, and more particularly to an image recording apparatus for recording video and audio.

[0002]

2. Description of the Related Art Conventionally, generally, when a television broadcast is recorded on a home VCR, an undesired commercial message inserted between programs is also automatically recorded. Several methods have been proposed to prevent this unwanted commercial message recording.

[0003] As a conventional example of the above proposal, there is, for example, a "commercial auto-cut recording apparatus in a home video deck" disclosed in JP-A-60-149277. In the conventional example, as a solution to the above problem, attention has been paid to the fact that audio during a commercial message period of television broadcasting is generally stereo or monaural, and a dubbed foreign movie program is broadcast in two languages. In this solution, a pilot signal indicating an audio multiplex broadcast is detected and only a bilingual broadcast portion is recorded. As a result, an image recording apparatus that records only the main part of a dubbed foreign movie program, excluding commercial messages, has been achieved.

According to the above-mentioned prior art publication, a commercial message period is determined by detecting a pilot signal indicating audio multiplex broadcasting, and during the commercial message period, recording is temporarily stopped and only the main part can be recorded. Is described.

[0005]

However, in the above-mentioned conventional auto-cut recording apparatus, in a Japanese movie in which the sound at the time of program broadcast is stereo or monaural, or in a foreign movie program with subtitle display, the main message and the commercial message are discriminated. Is impossible.

FIG. 5 is an explanatory diagram of a main program recording by a conventional image apparatus focusing on the audio format of television broadcasting. In the case of the foreign movie (dubbed) 4-A in FIG. 5, a configuration in which the main voice of the main part is a bilingual voice in which the main voice is Japanese and the secondary voice is a foreign language is conceptually shown. In this case, the commercial message period is a stereo or monaural sound, and only the main part (A1, A3, A5) can be recorded by recording only when the voice is bilingual. However, foreign movies (subtitles) 4-B and Japanese movies 4-C
In the case of, the audio format is stereo or monaural for both the main program and the commercial message period. Therefore, in the above conventional example, there is a problem that it is impossible to distinguish between the main part and the commercial message, and it is impossible to record only the main part.

The present invention has been made in view of the above points, and has as its object to provide an image recording apparatus capable of recording only a main part of a movie program being broadcast on television.

[0008]

To achieve the above object, an image recording apparatus according to the present invention comprises a buffer means for temporarily storing an input video signal and a data compression means for compressing output data of the buffer means. And an ECC for adding an error correction signal to the data compressed by the data compression means.
Adding means 500, a modulating means 600 for modulating the data to which the error correction signal has been added by the ECC adding means, and a recording medium 70 for recording the modulated signal modulated by the modulating means.
0, a 2-3 pull-down detecting means 100 for detecting whether or not the input video signal is a telecine video signal created by a 2-3 pull-down method from a film video, and executing the recording of the video signal based on a result of the detection. Recording control means 200 for determining the presence / absence of the movie signal, so that only the main part of the movie signal can be recorded.

The above-mentioned 2-3 pull-down detecting means 1
In the case of 00, it is good to judge whether or not the video signal is a telecine video signal by matching the correlation between the data of the current field of the video signal and the data two fields before, and the occurrence of this match once every five fields.

Further, the above-mentioned recording control means 200
If the signal detected by the -3 pull-down detecting means 100 is not valid for a certain period, it may be determined that the signal is a still image portion of a normal video, and recording may not be performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an image recording apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG.
FIG. 4 to FIG. 4 show an embodiment of the image recording apparatus of the present invention.

FIG. 1 is an overall block diagram of the image recording apparatus of the present embodiment. 1, the image recording apparatus according to the present embodiment includes a 2-3 pull-down detection unit 100 to which a video signal Vin and a field synchronization signal VP are input,
The output 2-3_DE of the 2-3 pull-down detection unit 100
Recording control unit 2 to which the TECT is input and controls the operation of each unit
00, and the buffer unit 300 and the data compression unit 40 which are connected in series with the input of the field synchronization signal VP.
0, an ECC adding unit 500, a modulating unit 600, and an image recording medium 700.

In the image recording apparatus having the above configuration, the video signal Vin is sent to a 2-3 pull-down detecting section 100 described later. The 2-3 pull-down detecting unit 100 detects a duplicated field and validates the 2-3_DETECT signal when the field matches the 2-3 pull-down pattern.

The 2-3_DETECT signal is sent to the recording control unit 2
Sent to 00. The video signal Vin is also stored in the buffer unit 300. Since the recording control unit 200 controls the storage location of the buffer unit 300, 2-3
According to the _DETECT signal, which part of the storage data inside the buffer unit 300 is 2-3 pull-down,
Know which part is the normal data. Therefore, only data converted by the 2-3 pull-down method can be output from the buffer unit 300.

When the image recording apparatus is in the movie recording mode, the storage control unit 200 causes only the 2-3 pull-down data to be output from the buffer unit 300. The output data of the buffer unit 300 is sent to the data compression unit 400. Data compression unit 4
In 00, moving image compression is performed by an existing technology such as MPEG1 or MPEG2. This compressed data output is added to the error correction code by the ECC adding section 500 and then output to the modulating section 60.
It is modulated by 0 and recorded on the image recording medium 700. The image recording medium 700 includes digital recording media such as a hard disk, a semiconductor memory, and a CD-ROM.
There are R, CD-RW, DVD-R, DVD-RAM, etc., and the error correction code and modulation method correspond to the respective media standards.

Next, the 2-3 pull-down method will be described. Movies released in theaters are shot on 24 frames / second film. When these movies are broadcast on television, it is necessary to convert a movie film of 24 frames / sec into a television signal of 60 frames / sec.
Telecine conversion is performed by a method called three pull-down.

FIG. 3 is an explanatory diagram of the 2-3 pull-down system. When making a television signal (60 Hz / field) from a movie film (24 Hz / frame) or the like, usually 1
Two frames of film are made to correspond to five fields of a television signal with a cycle of / 12 seconds.

In the 2-3 pull-down system that is currently used, odd-numbered film frames are written in two fields, and even-numbered film frames are written in three fields. Thus, two frames of the film correspond to five fields of the television signal. That is, in FIG.
The first and third frames of the odd-numbered film are respectively written in two fields of the first and second fields and the sixth and seventh fields of the telecine image, whereas the first and third frames of the telecine image are each written in the two fields of the even-numbered film frame. The second frame and the fourth frame are dropped in the third, fourth, fifth and eighth, ninth, and tenth fields.

Here, paying attention to each field of the telecine image, it can be seen that the third and fifth fields and the eighth and tenth fields are exactly the same. That is, when focusing on a certain field of the telecine image and a field two fields before the same, there is a case where exactly the same thing exists, and it is understood that it appears once in five fields.

Next, the operation of the 2-3 pull-down detecting section 100 will be described with reference to FIG. In the figure, an input 60 Hz video signal Vin is directly connected to a subtractor 103, passes through field memories 101 and 102 constituting a delay circuit, and a video signal V2 delayed by two fields is supplied to the subtractor 103. Connected. In the subtractor 103, the current video signal Vin and the signal V2 two fields before are output.
Is calculated for each pixel with the absolute data
Send to 4. After the absolute value of the difference data is obtained by the absolute value device 104, the cumulative adder 105 calculates the cumulative sum of the absolute values of the differences of the pixels for one field.

The reset terminal R of the accumulator 105 is supplied with the field synchronization signal VP, and the accumulated sum is cleared for each field. The comparator 106 compares the accumulated sum with a threshold value 107 set to an appropriate value. In the comparator 106, the threshold 107
If the cumulative sum is smaller than that, it is determined that there is a possibility that the data is 2-3 pull-down data, and an "H" signal is output from the output. The output of the comparator 109 is input to the clock of the flip-flop 110. Flip-flop 11
Since the data input D of 0 is fixed at “H”, when the output of the comparator becomes valid, the 2-3_DETECT signal output from the flip-flop 110 becomes “H” and becomes valid.

The counter 108 is a 3-bit counter that counts up by the field synchronization signal VP and is reset by the output of the comparator 106. When the counter value reaches a maximum, the counter 108 keeps that value. The output of the counter 108 is connected to the input of the comparator 109. The comparator 109 receives the input from the counter 108 and a predetermined value 5 (binary notation 101B).
When the counter value becomes "5", the output is set to "H".

The output of the comparator 109 is connected to the reset input R of the flip-flop 110, so that 2-3
The _DETECT signal becomes 'L' and becomes invalid. That is, the flip-flop 110 is reset unless a phenomenon in which the field data of two fields are different occurs once in five fields. Therefore, the video signal input Vin
If is a telecine video subjected to 2-3 pull-down conversion, 2
The -3_DETECT signal becomes "H" (valid), and otherwise becomes "L" (invalid).

Next, the recording control section 200 will be described.
According to the state of the 2-3_DETECT signal from the 2-3 pull-down detection unit 100, the recording control unit 200 determines whether the buffer unit 300 and the data compression unit 40
0, a recording operation request is made to the ECC adding unit 500 and the modulating unit 600.

However, when the input video Vin is a still image, the 2-3_DETECT signal becomes valid even during a commercial message period in which the input video Vin is not a telecine video because each field data is the same.
Here, paying attention to the fact that the commercial message period of television broadcasting is at least 15 seconds, 2-3_DE
Even if the TECT signal is temporarily enabled by the still image portion in the commercial message, if the TECT signal is not valid for a certain period of time, for example, 15 seconds or less, the recording control unit 200 does not request the recording operation. This can prevent erroneous determination of a still image portion during a commercial message period.

FIG. 4 is an explanatory diagram of the main program recording by the image apparatus of the present invention focusing on the field correlation of the television broadcast. According to the above embodiment, in the foreign movie (dubbed) 5-D, the foreign movie (subtitles) 5-E, and the Japanese movie 5-F in FIG. 4, only the 2-3 pull-down converted telecine image period is recorded. . As a result, foreign movie [dubbing] main part (D1, D3, D5), foreign movie [subtitle] main part (E1, E3, E5), Japanese movie main part (F1,
F3, F5) can be recorded. Therefore, commercials (D2, D4, E2, E4, F2, F4) are not recorded.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

[0028]

As is clear from the above description, according to the image recording apparatus of the present invention, two-dimensional image field correlation is performed by using image field correlation.
It is determined whether the video is a telecine video by a -3 pulldown or a normal television video, and recording on a recording medium is executed based on the determination. Therefore, it is possible to record only the main part of a television broadcast movie program and cut commercial messages.

[Brief description of the drawings]

FIG. 1 is an overall block diagram showing an embodiment of an image recording apparatus of the present invention.

FIG. 2 is a block diagram of a 2-3 pull-down detecting unit in FIG.

FIG. 3 is an explanatory diagram of a 2-3 pull-down method.

FIG. 4 is an explanatory diagram of main program recording according to the present invention.

FIG. 5 is an explanatory diagram of main program recording according to the related art.

[Explanation of symbols]

 100 2-3 Pulldown detection unit 200 Recording control unit 300 Buffer unit 400 Data compression unit 500 ECC addition unit 600 Modulation unit 700 Recording medium 101 Field memory 102 Field memory 103 Subtractor 104 Absolute value unit 105 Cumulative adder 106 Comparator 107 Threshold 108 Counter 109 Comparator 110 Flip flop 4-A Foreign movie [dubbing] 4-B Foreign movie [subtitle] 4-C Japanese movie 5-D Foreign movie [dubbing] 5-E Foreign movie [subtitle] 5-F Japanese movie A1, A3, A5 Foreign movie main story A2, A4 Commercial message B1, B3, B5 Foreign movie main story B2, B4 Commercial message C1, C3, C5 Japanese movie main story C2, C4 Commercial message

Claims (3)

(57) [Claims] A buffer means for temporarily storing an input video signal; a data compression means for compressing output data of the buffer means; and an error correction signal added to the data compressed by the data compression means. An ECC adding unit 500; a modulating unit 600 that modulates data to which an error correction signal has been added by the ECC adding unit; a recording medium 700 that records a modulated signal modulated by the modulating unit; 2-3 pull-down detecting means 100 for detecting whether or not the video signal is a telecine video signal created by a 2-3 pull-down method, and a recording control means 200 for determining whether or not to execute recording of a video signal based on a result of the detection. An image recording apparatus, comprising: recording only a main part of a movie signal. 2. The 2-3 pull-down detecting means 100
Is characterized in that it is determined whether or not the video signal is a telecine video signal by matching the correlation between the current field of the video signal and the data two fields before and once the matching occurs every five fields. The image recording device according to claim 1. 3. The recording control unit 200 according to claim 2, wherein:
3. The image recording apparatus according to claim 1, wherein if the signal detected by the pull-down detection means is not valid for a predetermined period, the signal is determined to be a still image portion of a normal video and recording is not performed.